JPH0521197B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a heating system for a nuclear power plant that heats various parts of a nuclear reactor building.

[Technical background of the invention and its problems]

In general, a heating system of a nuclear power plant has an in-station hot water system that heats each heating target in a nuclear reactor building, and this system forms a closed loop as shown in FIG. 1.

A hot water heat exchanger 3 is disposed in this station hot water system 2, and the circulating water flowing through this system 2 is passed through the hot water heat exchanger 3 to a non-reheat exchanger 7 of a reactor coolant purification system 5. It is heated to a constant temperature by the exhaust heat from.
This heated circulating water is sent to the heating object 13 by the hot water pump 9 via the automatic temperature control valve 11, and the heating object 13 is heated.

The temperature of the heating object 13 is controlled to approximately a predetermined value by the automatic temperature control valve 11. That is, the valve opening degree of the automatic temperature adjustment valve 11 is adjusted according to the temperature of the heating object 13 detected by the temperature detector 15, and the flow rate of circulating water heated to a constant temperature is changed.
When the outside air temperature is low and the temperature of the heating object 13 is lower than a predetermined value, the opening degree of the regulating valve 11 is increased to increase the flow rate of circulating water sent to the heating object. Also,
When the temperature of the heating object 13 is higher than a predetermined value, the opening degree of the valve 11 is reduced to reduce the flow rate of circulating water sent to the heating object.

However, as shown in Figure 2, according to year-round changes in temperature in certain regions of Japan, the severe cold period when the minimum temperature drops below 0°C and the automatic temperature control valve 11 must be fully opened is very short. Thus, during other periods, valve 11 is closed, and during particularly warm periods, valve 11 is closed.
The opening is close to the closing state. Due to such a change in the opening degree of the automatic temperature control valve 11, the hot water pump 9
The operating flow range becomes wider and the load fluctuates significantly. As a result, the operation of the hot water pump 9 may become unstable, and the reliability of the heating system 1 may decrease. In particular, when the automatic temperature control valve 11 is at an opening close to the closed state, there is a risk that the pump impeller stirs the hot water in the casing pump, causing the hot water pump 9 to overheat.

Furthermore, since the operating flow rate range of the hot water pump 9 is wide, special consideration is required in pump design, and furthermore, it becomes difficult to monitor the pump operating state.

In addition, since the automatic temperature control valve 11 has an automatic operation mechanism, it is more likely to fail than a manual valve, reducing the reliability of the heating system. Furthermore, since the automatic temperature control valve 11 is provided at the inlet of each heating object 13, maintenance and inspection work takes a long time, and an increase in cost is unavoidable.

[Purpose of the invention]

This invention was made in view of the above facts,
The purpose of the present invention is to provide a heating system for a nuclear power plant that can improve system reliability, facilitate maintenance and inspection, and further reduce costs.

[Summary of the invention]

In order to achieve the above object, a heating system for a nuclear power plant according to the invention described in claim 1 provides a heating system for a nuclear power plant that has a closed-loop in-house hot water system that heats objects to be heated in a nuclear reactor building. The system includes a hot water heat exchanger that is disposed in the station hot water system and heats the circulating water of the station hot water system by receiving heat from the non-regenerative heat exchanger of the reactor coolant purification system; a hot water pump disposed in a system to circulate the heated circulating water; and a temperature adjustment device disposed upstream of the hot water pump in the in-house hot water system and including a cold water valve, a hot water valve, and a control calculation unit. , the hot water valve is connected to the downstream side of the hot water heat exchanger and guides hot water heated by the hot water heat exchanger out of the circulating water, and the cold water valve is connected to the hot water heat exchanger. The control calculation unit is connected to an outside air temperature detector and the hot water valve and cold water valve, and is connected to the outside air temperature detector and the hot water valve and the cold water valve, and is connected to the outside air temperature detector and the hot water valve and the cold water valve, and is connected to the outside air temperature detector and the hot water valve and the cold water valve, Based on the signal from the temperature sensor, the opening degrees of both valves are adjusted to change the flow rate of cold water from the cold water valve and the flow rate of hot water from the hot water valve, and the mixed water, which is a mixture of cold water and hot water, is The temperature of the mixed water is controlled to follow the outside air temperature while keeping the flow rate constant.

Further, the invention described in claim 3 provides a heating system for a nuclear power plant having a closed-loop in-house hot water system that heats objects to be heated in a nuclear reactor building, in which a certain amount of circulating water always flows. a hot water heat exchanger disposed in the reactor coolant purification system that receives heat from a non-regenerative heat exchanger of the reactor coolant purification system to heat circulating water of the station hot water system, and a hot water heat exchanger disposed in the station hot water system; A hot water pump that circulates the heated circulating water, a reactor auxiliary cooling system that transports waste heat from the non-regenerative heat exchanger to the hot water heat exchanger, and a cold water valve, a hot water valve, and control calculations. the cold water valve is connected to the downstream side of the hot water heat exchanger, and the cold water valve is connected to the downstream side of the hot water heat exchanger, and the cold water valve is connected to the hot water heat exchanger to cool the cooled water that has been guided from the non-regenerative heat exchanger to the hot water heat exchanger. The hot water valve is connected to a bypass pipe that bypasses the hot water heat exchanger to lead high temperature cooling water from the non-regenerative heat exchanger as hot water, and the control calculation unit It is connected to a temperature sensor, the cold water valve, and the hot water valve, and adjusts the opening degree of both valves based on the signal from the outside air temperature sensor to change the cold water flow rate, thereby following the outside air temperature. It controls the temperature of circulating water. Both of these inventions are intended to reduce the load fluctuation range of the hot water pump and improve pump operating performance.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

FIG. 3 is a system diagram showing a first embodiment of a heating system for a nuclear power plant according to the present invention.

A heating system 20 of a nuclear power plant includes an in-station hot water system 21, a reactor coolant purification system 23, and a reactor auxiliary equipment cooling system 25. Of these, the station hot water system 21 receives the amount of heat discharged from the reactor coolant purification system 23 via the reactor auxiliary equipment cooling system 25,
This is a system that heats each heating object 26 in the reactor building to a predetermined temperature. In addition, reactor coolant purification system 2
3 is a system for removing impurities generated within the reactor pressure vessel 27.

In the reactor coolant purification system 23, a circulation pump 29, a regenerative heat exchanger 31, a non-regenerative heat exchanger 33, and a purification device 35 are sequentially arranged in the reactor pressure vessel 27. The non-regenerative heat exchanger 33 cools the coolant to the optimum temperature for purification. Further, as the cooling water passes through the purification device 35, fission products generated in the reactor core and corrosion products in the reactor pressure vessel 27 are removed. The outlet side of the purification device 35 is connected to the reactor pressure vessel 27 via the regenerative heat exchanger 31.
connected to. Therefore, the purified cooling water is
The temperature is raised by passing through the regenerative heat exchanger 31 and then introduced into the reactor pressure vessel 27.

On the other hand, the reactor auxiliary cooling system 25 is a closed loop that connects the non-regenerative heat exchanger 33 and the hot water heat exchanger 37 of the station hot water system 21, and a cooling water pump 39 is provided in this loop. Cooling water in the reactor auxiliary cooling system 25 is pumped to this system 25 by a cooling water pump 39.
The exhaust heat from the non-regenerative heat exchanger 33 is transported to the hot water heat exchanger 37.

Further, the in-house hot water system 21 connects one or more heating objects 26 to one hot water heater 37 in parallel, and is configured as a closed loop. A hot water pump 41 is disposed in this loop, thereby circulating water between the hot water heat exchanger 37 and each heating object 26. An inlet valve 43 serving as a flow rate regulating valve is provided on the inlet side of each heating target 26. This inlet valve 43 is used to balance the flow rate of circulating water supplied to each heating target 26, or to transfer the heating target 26 to the in-house hot water system 21 for maintenance and inspection.
It has the function of separating from the Although a manual valve is used as the inlet valve 43, the heating object 26, which requires particularly precise temperature control, is provided with an automatic temperature control valve similar to that used in the conventional example.

In addition, the in-house hot water system 21 includes a hot water heat exchanger 37.
Bypass piping 45 is provided to bypass the. This bypass pipe 45 directly connects the downstream side of the heating object 26 and the suction side of the hot water pump 41, and a temperature adjustment device 47 is disposed at the suction side connection portion of the hot water pump 41. Further, the bypass pipe 45 is provided with a flow rate limiting orifice 49 .
This flow rate limiting orifice 49 is connected to the bypass piping 4.
This gives the same pressure loss to the circulating water flowing through the hot water heat exchanger 37. As a result, in the temperature adjustment device 47, mixing of the circulating water flowing out from the flow rate limiting orifice 49 and the hot water heat exchanger 37 is facilitated.

The temperature adjustment device 47 includes a cold water valve 51 and a hot water valve 5.
3, and a control calculator 55 electrically connected to the cold water valve 51 and the hot water valve 53. The cold water valve 51 is connected to the flow restriction orifice 49.
Further, the hot water valves 53 are connected to respective outlet sides of the hot water heat exchanger 37. Furthermore, the outflow sides of the cold water valve 51 and the hot water valve 53 merge and are connected to the hot water pump 41. Therefore, the cold water valve 51 and the hot water valve 53 mix the circulating water (hot water) heated by the hot water heat exchanger 37 and the low-temperature circulating water (cold water) flowing through the bypass piping 45, and the mixed water is It leads to hot water pump 41.

The control calculator 55 also includes an outside air temperature detector 57.
are electrically connected, and a relational expression (FIG. 4) between the circulating water temperature and the outside air temperature necessary to maintain the heating object 26 at a predetermined temperature is stored. Based on the detected value from the outside air temperature detector 57 and the above relational expression, the control calculator 55 adjusts the respective opening degrees of the cold water valve 51 and the hot water valve 53, thereby maintaining the flow rate of the mixed water constant while maintaining the hot water and the hot water. The temperature of the mixed water is controlled to a desired temperature by changing the mixing ratio of cold water.

Next, the effect will be explained.

When the reactor coolant purification system 21 and the reactor auxiliary cooling system 23 operate, the exhaust heat of the non-regenerative heat exchanger 33 is transported to the hot water heat exchanger 37 of the in-core hot water system 21 .

Next, the in-house hot water system 21 is activated. When the hot water pump 41 is driven, the circulating water is guided to each heating object 26 via the inlet valve 43,
heating. After heating, the circulating water is cooled and becomes cold water, and is transferred to the bypass pipe 45 and the hot water heat exchanger 3.
Guided by 7. The circulating water guided to the hot water heat exchanger 37 receives exhaust heat from the non-regenerative heat exchanger 33 and becomes hot water, and is guided to the hot water valve 53. on the other hand,
The circulating water guided to the bypass pipe 45 is guided to the cold water valve 51 via a flow rate limiting orifice 49.

Further, when the outside air temperature detected by the outside air temperature detector 57 is input to the control calculator 55, the control calculator 55 adjusts and controls the opening degrees of the hot water valve 53 and the cold water valve 51. This adjustment control is performed so that the circulating water (mixed water) guided to the hot water pump 41 maintains a constant flow rate, and the temperature of the circulating water becomes a value corresponding to the outside air temperature according to the relational expression shown in FIG. . For example, according to FIG. 4, as the outside temperature is lower, a larger amount of heat must be supplied, so under the condition that the flow rate of the mixed water is constant, the opening degree of the hot water valve 53 is increased, and the opening degree of the cold water valve 51 is increased. Narrow down.

As a result, the circulating water (mixed water) that flows out from the hot water valve 53 and the cold water valve 51, mixes, and is guided to the hot water pump 41 is maintained at a predetermined temperature and a constant flow rate. By supplying this circulating water to the heating object 26 via the hot water pump 41, the heating object 26
is heated to the optimum temperature regardless of changes in outside temperature.

According to the above embodiment, since the flow rate of the circulating water flowing through the in-house hot water system 21 is set constant, the operational performance of the hot water pump 31 is stabilized, and the reliability of the heating system can be improved. In particular, it is possible to avoid overheating of the hot water pump 31 caused by a low flow rate, so there is no need to monitor the pump operating state, and maintenance and inspection of the heating system can be simplified. Furthermore, since the circulating water has a constant flow rate, the load fluctuation range of the hot water pump 31 is small, and the pump only needs to exhibit a predetermined performance within this narrow load range. Therefore, the hot water pump 31 can be easily designed and costs can be reduced.

Further, when the inlet valve 43 is a manual valve, it is less likely to fail and is less expensive than an automatic temperature control valve, so it is possible to improve the reliability of the heating system and reduce costs. Furthermore, since there is no need for accessory equipment for automatically controlling the valve, maintenance and inspection of the system can be facilitated.

FIG. 5 is a system diagram showing a second embodiment of the heating system for a nuclear power plant according to the present invention. In this embodiment, parts similar to those in the first embodiment are designated by the same reference numerals, and a description thereof will be omitted.

In this heating system 60, two hot water heat exchangers are arranged in series in an in-house hot water system 61. The capacities of these first and second hot water heat exchangers 63, 65 are designed to be slightly smaller than the capacity of the hot water heat exchanger 37 of the first embodiment. Of these, the first hot water heat exchanger 63
is arranged in parallel with the first flow rate limiting orifice 67, and the second hot water heat exchanger 65 is arranged in parallel with the second flow rate limiting orifice 69, respectively. The connecting portions of the first and second hot water heat exchangers 63 and 65 and the connecting portions of the first and second flow control orifices are connected via a bypass valve 71. In addition, the first hot water heat exchanger 63
A switching valve 73 is provided on the downstream side of the branch point 72 of the bypass pipe 45 on the inlet side of the bypass pipe 45 . The bypass valve 71 and the switching valve 73 are electrically connected to the control calculator 55, and are controlled to open and close by the control calculator 55.

Next, the operation of this embodiment will be explained.

When the outside air temperature is extremely low, the outside air temperature detector 57 detects this, and this detected value is sent to the control calculator 5.
5 is input. Then, the control calculator 55 outputs a signal that closes the bypass valve 71 and opens the switching valve 73. As a result, the circulating water that has passed through the heating target 26 is divided at the branch point 72, and one of the water is sequentially guided to the first and second hot water heat exchangers 63 and 65 via the switching valve 73. The circulating water is heated by the first and second hot water heat exchangers 63 and 65, becomes hot water, and reaches the hot water valve 53. The other part of the combined circulating water passes through the first and second flow rate limiting orifices 67 and 69 and is guided to the cold water valve 51 as cold water at a low temperature.

The control calculator 55 takes into account the temperature of the hot water heated by the two heat exchangers and adjusts the opening degrees of both valves 51 and 53 so that the mixed water of hot water and cold water satisfies the relational expression shown in FIG. Set. When making this setting, consideration is given to maintaining a constant flow rate of the mixed water. after that,
Circulating water as mixed water adjusted to a desired temperature is supplied to each heating target 26 via the hot water pump 41.

Further, when the outside air temperature is moderately low, the switching valve 73 is closed and the bypass valve 71 is opened in response to a signal from the control calculator 55. As a result, the circulating water that has passed through the heating target 26 passes through the first flow rate limiting orifice 67 and is then divided into water that passes through the bypass valve 71 and water that passes through the second flow rate limiting orifice 69. The divided circulating water that has passed through the bypass valve 71 is heated by the second hot water heat exchanger 65 and reaches the hot water valve 53 . In addition, the second flow rate limiting orifice 69
The branched circulating water that has passed through is guided to the cold water valve 51 as cold water at a low temperature. Circulating water (hot water, cold water) led to these hot water valves 53 and cold water valves 51
are mixed by the control calculator 55 in the same manner as in the first embodiment, and supplied to each heating target 26 via the hot water pump 41.

In the first embodiment, during the severe cold season when the outside air temperature is extremely low, the opening degree of the hot water valve 53 is increased and the cold water valve 51 is significantly throttled. However, if the cold water valve 51 is significantly constricted, the cold water will flow at high speed through the narrowed flow path of the valve, causing cavitation or erosion, which may damage the cold water valve 51. A similar phenomenon may occur in the hot water valve 53 when the outside air temperature is high and the hot water valve 53 is greatly throttled.

In contrast, in this second embodiment, the temperature of the hot water reaching the hot water valve 53 can be roughly adjusted depending on whether the circulating water passes through one hot water heat exchanger or two hot water heat exchangers. . For example, when the outside temperature is high and the opening degree of the hot water valve 53 is to be small, the switching valve 73
By controlling the bypass valve 71, the circulating water is heated only by the second hot water heat exchanger 65. Therefore,
Hot water valve 53 compared to the case with two hot water heat exchangers
The temperature of the hot water introduced can be adjusted to a lower value. As a result, when obtaining the desired mixed water temperature,
Compared to the case of the first embodiment, the ratio of the amount of hot water to the amount of cold water can be increased, and there is no need to significantly throttle the hot water valve 51. Furthermore, even when the outside air temperature is extremely low and the cold water valve 51 is throttled, by heating the circulating water with two hot water heat exchangers, the temperature of the hot water (circulating water) reaching the hot water valve 53 can be adjusted as in the first embodiment. This can be increased compared to the case. Therefore, in this case as well, there is no need to significantly throttle the cold water valve 51.

In this way, the circulating water temperature can be adjusted without significantly throttling the hot water valve 53 and the cold water valve 51.
In addition to the effects of the first embodiment, this heating system 60 can reduce damage to the hot water pump 41 caused by cavitation or erosion.

In the second embodiment, two hot water heat exchangers are arranged in series, but three or more hot water heat exchangers may be arranged.

FIG. 6 is a system diagram showing a third embodiment of a heating system for a nuclear power plant according to the present invention. In this embodiment, parts similar to those in the first embodiment are designated by the same reference numerals, and a description thereof will be omitted.

In this heating system 80, an in-house hot water system 81
The difference is that the temperature sensor 15 of the conventional example (FIG. 1) is not present, and the inlet valve 43 is used instead of the automatic temperature adjustment valve 11.
The configuration is similar to that of the conventional example except that the auxiliary cooling system 83 is different. In other words,
The auxiliary cooling system 83 is provided with a bypass pipe 85 that bypasses the hot water heat exchanger 37 and guides the cooling water upstream of the hot water heat exchanger 37 to its downstream side. This bypass piping 85 has a flow rate limiting orifice 49.
is provided, and a temperature adjustment device 87 is provided at the downstream connection portion of the bypass pipe 85.

This temperature adjustment device 87 has a cold water valve 51, a hot water valve 53, a control calculator 55, and an outside air temperature detector 57 similarly to the temperature adjustment device 47 of the first embodiment. Of these, the cold water valve 51 is provided in the downstream piping of the hot water heat exchanger 37, and the hot water valve 53 is provided in the bypass piping 85 downstream of the flow rate limiting orifice 49, respectively. Therefore, cooling water (chilled water) heated by the non-regenerative heat exchanger 33 of the reactor coolant purification system 23 and lowered in temperature by transporting heat to the hot water heat exchanger 37 is introduced into the cold water valve 51. It will be destroyed. In addition, hot water valve 53
In this case, high-temperature cooling water (warm water) heated by the non-regenerative heat exchanger 33 is introduced through the flow-limiting orifice 49. Furthermore, the cold water from the cold water valve 51 and the hot water from the hot water valve 53 are combined and guided to the cooling water pump 39 via a heat exchanger (not shown).

Also in this embodiment, the opening degrees of the cold water valve 51 and the hot water valve 53 are controlled by the control calculator 55 in the same manner as in the first embodiment. Cooling water (cold water) guided to the hot water heat exchanger 37 by this opening degree control.
The amount changes, and in accordance with this change, the temperature of the circulating water flowing at a constant flow through the in-house hot water system 81 is adjusted to a desired temperature. Therefore, also in this example,
The same effects as in the first embodiment can be obtained.

FIG. 7 is a system diagram showing a part of a fourth embodiment of a heating system for a nuclear power plant according to the present invention. In this embodiment as well, the same parts as in the second and third embodiments are given the same reference numerals, and the explanation thereof will be omitted.

This embodiment has the same configuration as the third embodiment and the second embodiment has the same configuration as the first embodiment. In other words, the in-house hot water system 91 of the heating system 90 is provided with first and second hot water heat exchangers 63 and 65 in series, and these hot water heat exchangers 63 and 65 are also provided in series.
Bypass piping 85 is provided to bypass the. This bypass piping 85 is provided with first and second flow rate limiting orifices 67, 69. The connecting portions of the first and second hot water heat exchangers 63 and 65 and the connecting portions of the first and second flow rate limiting orifices 67 and 69 are connected via a bypass valve 71. Also,
A switching valve 73 is disposed near the upstream of the second hot water heat exchanger 65. Further, a temperature adjustment device 87 is provided at a connection between the downstream side piping of the first hot water heat exchanger 63 and the downstream side of the bypass piping 85. The control calculator 55 of the temperature adjustment device 87 is electrically connected to the bypass valve 71 and the switching valve 73.

Therefore, by controlling the opening and closing of the bypass valve 71 and the switching valve 73 as the outside temperature changes, one or two hot water heat exchangers are selectively operated, thereby reducing the circulating water of the station hot water system 91. Make rough adjustments to the temperature. Next, the cold water valve 51 and the hot water valve 5
Adjust the opening degree of No. 3 to set the circulating water temperature to a desired temperature that matches the outside air temperature. In this way, since the circulating water temperature is roughly adjusted by controlling the bypass valve 71 and the switching valve 73, the same effects as in the second embodiment can be obtained.

〔Effect of the invention〕

As described above, the heating system for a nuclear power plant according to the invention set forth in claim 1 is a heating system for a nuclear power plant that has a closed-loop in-house hot water system that heats objects to be heated inside the reactor building. a hot water heat exchanger that is disposed in the station hot water system and receives heat from a non-regenerative heat exchanger of the reactor coolant purification system to heat circulating water of the station hot water system;
A hot water pump disposed in the station hot water system to circulate the heated circulating water, and a temperature pump disposed upstream of the hot water pump in the station hot water system and equipped with a cold water valve, a hot water valve, and a control calculation section. The hot water valve is connected to the downstream side of the hot water heat exchanger and guides the hot water heated by the hot water heat exchanger out of the circulating water, and the cold water valve is connected to the downstream side of the hot water heat exchanger, and the cold water valve is connected to the downstream side of the hot water heat exchanger. The controller is disposed in a bypass pipe that bypasses the hot water heat exchanger and guides cold water flowing through the bypass pipe among the circulating water, and the control calculation unit is connected to the outside air temperature detector and the hot water valve and the cold water valve. , the opening degrees of the two valves are adjusted based on the signal from the outside air temperature sensor to change the flow rate of cold water from the cold water valve and the flow rate of hot water from the water temperature valve, so that the cold water and hot water are mixed. The temperature of the mixed water is controlled to follow the outside temperature while maintaining the flow rate of the mixed water constant. Further, the heating system for a nuclear power plant according to the invention described in claim 2 is a heating system for a nuclear power plant that has a closed-loop in-house hot water system that heats objects to be heated inside the reactor building. a hot water heat exchanger disposed in the station hot water system through which circulating water flows, the hot water heat exchanger receiving heat from the non-regenerative heat exchanger of the reactor coolant purification system to heat the circulating water of the station hot water system; A hot water pump is installed in the station hot water system to circulate the heated circulating water, and a reactor auxiliary equipment cooling system is installed to transport waste heat from the non-regenerative heat exchanger to the hot water heat exchanger. a temperature adjustment device including a cold water valve, a hot water valve, and a control calculation unit, the cold water valve being connected downstream of the hot water heat exchanger, and connecting the non-regenerative heat exchanger to the hot water heat exchanger. The hot water valve is connected to a bypass pipe that bypasses the hot water heat exchanger to lead high temperature cooling water from the non-regenerative heat exchanger as hot water. The above control calculation section is
It is connected to an outside air temperature sensor, the cold water valve, and the hot water valve, and follows the outside air temperature by adjusting the opening degrees of both valves and changing the cold water flow rate based on the signal from the outside air temperature sensor. This is to control the temperature of the circulating water. Therefore, both of the above inventions have the effect of reducing the load fluctuation range of the hot water pump, improving the pump operating performance, improving system reliability, facilitating maintenance and inspection, and reducing costs. play.

In addition, when two hot water heat exchangers are installed and the hot water heat exchangers are operated selectively to roughly adjust the circulating water temperature of the in-house hot water system, the hot water valve of the temperature adjustment device and The integrity of the cold water valve can be maintained.

Furthermore, if the flow rate adjustment valve is a manual valve,
Failures of this flow rate regulating valve can be reduced, the reliability of the heating system can be improved, maintenance and inspection can be simplified, and costs can further be reduced.

[Brief explanation of drawings]

Figure 1 is a system diagram showing the heating system of a conventional nuclear power plant, Figure 2 is a graph showing year-round changes in daily maximum and minimum temperatures in a certain region of Japan, and Figure 3 is a nuclear power plant according to the present invention. A system diagram showing the first embodiment of the heating system for a place, Figure 4 is a graph showing the relationship between the circulating water temperature and outside air temperature necessary to maintain the heating target at the desired temperature, and Figures 5 to 7 are FIG. 3 is a system diagram showing second to fourth embodiments of a heating system for a nuclear power plant according to the present invention. 20, 60, 80, 90... Heating system, 2
1, 61, 81, 91... In-house hot water system, 23...
Reactor coolant purification system, 25, 83, 93...Reactor auxiliary equipment cooling system, 26...Heating object, 33...Non-regenerative heat exchanger, 37...Hot water heat exchanger, 41...Hot water pump, 43...Inlet valve, 47, 87...Temperature adjustment device, 51...Cold water valve, 53...Hot water valve, 5
5...Control calculator, 57...Outside air temperature detector, 6
3...First hot water heat exchanger, 65...Second hot water heat exchanger.

Claims (1)

[Scope of Claims] 1. In a heating system for a nuclear power plant having a closed-loop in-house hot water system that heats objects to be heated in a reactor building, a non-regenerating reactor coolant purification system installed in the in-house hot water system is provided. a hot water heat exchanger that receives heat from the heat exchanger and heats circulating water in the station hot water system; a hot water pump that is disposed in the station hot water system and circulates the heated circulating water; a temperature adjustment device disposed upstream of the hot water pump in the hot water system and including a cold water valve, a hot water valve, and a control calculation section, the hot water valve being connected to the downstream side of the hot water heat exchanger. , the cold water valve is arranged in a bypass pipe that bypasses the hot water heat exchanger, and the cold water valve is arranged in a bypass pipe that bypasses the hot water heat exchanger, and the cold water valve flows through the bypass pipe. The control calculation unit is connected to an outside air temperature detector, the hot water valve, and the cold water valve, and adjusts the opening degrees of the two valves based on the signal from the outside air temperature detector, and controls the cold water valve. The flow rate of cold water from the hot water valve and the flow rate of hot water from the hot water valve are varied, and the temperature of the mixed water is controlled to follow the outside air temperature while maintaining the flow rate of the mixed water in which these cold water and hot water are mixed. A heating system for a nuclear power plant that is characterized by: 2 The hot water heat exchanger consists of two units, one or two
2. A heating system for a nuclear power plant according to claim 1, wherein circulating water as hot water guided to a hot water valve can be heated by a hot water heat exchanger. 3. In the heating system of a nuclear power plant that has a closed-loop in-house hot water system that heats the heating target inside the reactor building, the heating system is installed in the above-mentioned in-house hot water system through which a certain amount of circulating water always flows, and is installed in the reactor coolant purification system. a hot water heat exchanger that receives heat from a non-regenerative heat exchanger to heat circulating water in the in-house hot water system; a hot water pump that is disposed in the in-house hot water system and circulates the heated circulating water; a temperature adjustment device disposed in a reactor auxiliary cooling system for transporting waste heat from the non-regenerative heat exchanger to the hot water heat exchanger, and equipped with a cold water valve, a hot water valve, and a control calculation section; The cold water valve is connected to the downstream side of the hot water heat exchanger, and guides the cooled water that has been led from the non-regenerative heat exchanger to the hot water heat exchanger as cold water, and the hot water valve is connected to the hot water heat exchanger. connected to bypass piping that bypasses the heat exchanger to guide high-temperature cooling water from the non-regenerative heat exchanger as hot water, and the control calculation unit is connected to the outside air temperature detector and the cold water valve and hot water valve; The nuclear power plant is characterized in that the circulating water temperature is controlled in accordance with the outside air temperature by adjusting the opening degrees of the two valves and changing the cold water flow rate based on the signal from the outside air temperature detector. heating system. 4 The hot water heat exchanger consists of two units, and the circulating water is one
4. The heating system for a nuclear power plant according to claim 3, wherein heating is possible using cooling water as cold water of an auxiliary equipment cooling system via one or two hot water heat exchangers.