CN204242595U - Integrated pressurized water reactor with built-in steam pressurizer heat shield and its components - Google Patents

Abstract

Be the Integrated PWR of the built-in steam pressurizer thermal insulation board of presurized water reactor and formation thereof disclosed in the utility model, mainly solve to exist when external electrical heating type steam pressurizer is connected by Surge line piping with reactor coolant loop in prior art and potentially to break the problem causing cooling medium loss of-coolant accident (LOCA) risk to occur because of Surge line piping.Presurized water reactor in the utility model built-in steam pressurizer thermal insulation board comprises the heat shield body (1) be made up of the double-deck austenite stainless steel plate forming air blanketing (2), and is arranged on connector (3) that is one-body molded with it above heat shield body (1) and the combination formation composite structure of falling hat; Described heat shield body (1) is then provided with cylindrical wave hole (4).The utility model has and meets the good and realization response of high temperature and high pressure environment, heat-proof quality and pile up the advantages such as the two-way rapid fluctuations of subcooled water and saturation water under various transient condition.

Description

Integrated pressurized water reactor with built-in steam pressurizer heat shield and its components

technical field

The utility model relates to a heat insulation board, in particular to a heat insulation board for a built-in steam pressurizer in a pressurized water reactor and an integrated pressurized water reactor composed of the same.

Background technique

The traditional external electric heating steam pressurizer is a high-pressure vessel consisting of a vapor-liquid two-phase space, the upper half of which is a saturated steam space and the lower half is a saturated water space. In the steam space of the pressurizer, there are sprayer connecting pipes, pressure relief valve connecting pipes and safety valve connecting pipes; in the water space, there is an electric heater, and the bottom is connected to the hot section pipe of the reactor coolant system through a wave pipe.

Since the steam pressurizer is connected with the reactor coolant system through the surge tube, there is an inevitable risk of a potential loss of coolant accident (LOCA) due to the rupture of the surge tube. In order to improve the inherent safety characteristics of the reactor and eliminate the LOCA accident caused by the rupture of the surge tube, the designer needs to build the steam pressurizer into the reactor pressure vessel.

However, since the supercooled water of the reactor coolant and the saturated water in the built-in pressurizer are in the reactor pressure vessel, and there is generally a temperature difference of about 25°C between the supercooled water and the saturated water, a new type of heat shield must be designed to realize the supercooled water and saturated water. Water isolation.

Moreover, the reactor pressure vessel is often in a high temperature of about 345 °C, a high pressure of 15.5 MPa, and a high-radiation boron water environment. The effect of heat insulation, but also need to be able to adapt to harsh working conditions, to solve such technical problems.

Utility model content

The purpose of this utility model is to solve the problem in the prior art that there is a potential risk of coolant loss accidents caused by the rupture of the surge tube when the external electric heating steam pressurizer is connected to the reactor coolant system through the surge tube, and to provide a satisfying High-temperature and high-pressure environment, good thermal insulation performance, and two-way rapid fluctuation of supercooled water and saturated water in the reactor under various transient working conditions. An integrated pressurized water reactor composed of built-in steam pressurizer heat shields.

In order to solve the above-mentioned shortcoming, the technical scheme of the utility model is as follows:

The heat shield of the built-in steam pressurizer of the pressurized water reactor includes the heat shield body composed of double-layer austenitic stainless steel plates forming the air interlayer, and the upper part of the heat shield body is integrally formed and combined to form an inverted hat-shaped composite The connecting body of the structure; the heat insulation board body is provided with a cylindrical undulating hole.

The utility model welds the connecting body on the thermal insulation plate of the built-in steam pressurizer of the pressurized water reactor into the reactor pressure vessel, and can effectively realize the isolation of the saturated water in the pressurizer and the supercooled water of the reactor coolant through the thermal insulation plate body , to achieve the effect of isolation.

The air interlayer composed of double-layer austenitic stainless steel plates can effectively achieve the effect of heat insulation. Since the air in the air interlayer is in a closed state, the air has almost no flow, which effectively reduces the convective heat transfer between saturated water and supercooled water. In this state the thermal conductivity of air is only 0.023 , is an extremely ideal high-efficiency heat insulation material in a high-temperature radiation environment; at the same time, the thermal conductivity of austenitic stainless steel is basically 10~30 Within the range, it is one of the metals with the worst thermal conductivity; therefore, the double-layer austenitic stainless steel plate composite structure with air interlayer can effectively reduce the heat conduction between saturated water and supercooled water.

The utility model effectively solves the problems of high temperature resistance, radiation resistance and corrosion resistance through the combination of air which is not easily activated and austenitic stainless steel materials.

In addition, through the cylindrical wave hole set on the heat shield body, the reactor can make the saturated water and supercooled water fluctuate rapidly in both directions under various transient conditions; at the same time, the inverted hat-shaped composite structure can adapt to the reactor pressure vessel The radial expansion of the top cover head under operating conditions leads to radial stretching of the heat shield, which effectively reduces thermal stress and improves service life. The effect is very significant.

As a preference, the cylindrical wave hole is located in the central part of the heat insulation board body.

Further, the heat insulation board body is provided with radial stiffeners and hoop stiffeners that divide the air interlayer into multiple cavities.

The air interlayer is divided into multiple cavities by the radial stiffening plate and the circumferential stiffening plate, which can more effectively prevent the flow of air and further enhance the effect of heat insulation; at the same time, the radial stiffening plate and the circumferential stiffening plate also make the insulation The hot plate body can withstand the high pressure environment up to 21MPa in the reactor.

Furthermore, a metal reflective layer made of corrugated mirror stainless steel foil is stacked horizontally in the cavity. The metal reflective layer in the cavity can effectively reduce the heat radiation effect. Therefore, by weakening the heat transfer mode of the radiation and combining the above weakened conduction and convection heat transfer modes, an excellent effect of reducing heat transfer is obtained. Furthermore, the heat shield body has good heat insulation performance, and the isolation of the saturated water in the pressurizer in the integrated pressurized water reactor and the supercooled water of the reactor coolant is realized, which is beneficial to the establishment of the steam space of the pressurizer and reduces the pressure of the pressurizer. Operating energy consumption.

As a preferred arrangement, the air interlayer is divided into 33 cavities by eight radial stiffening plates and four circumferential stiffening plates.

The utility model also discloses an integrated pressurized water reactor in which the steam pressurizer is built into the pressurized water reactor by using the heat insulation board of the built-in steam pressurizer of the above pressurized water reactor, and its specific structure is as follows:

Includes reactor pressure vessel with top head, reactor coolant subcooled water inside the reactor vessel, built-in pressurizer saturation water above the reactor coolant subcooler, and welded into the top head to separate the reactor The above-mentioned pressurized water reactor has a built-in steam pressurizer for the supercooled water of the coolant and the saturated water of the built-in pressurizer.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. The heat shield structure in this utility model has the advantages of high temperature resistance, high pressure resistance, radiation resistance, corrosion resistance, good heat insulation performance, etc., and the heat shield realizes the integration of the reactor under various transient working conditions The two-way rapid fluctuation of supercooled water and saturated water in the pressurized water reactor is very effective;

2. The utility model has a long service life, and its designed service life is expected to be as long as 60 years;

3. The utility model has high safety and creates conditions for nuclear energy as a distributed clean energy source. It can be used in the fields of nuclear energy power generation, nuclear energy urban district heating, nuclear energy industrial process heating and nuclear energy seawater desalination, etc., and its application range is wide;

4. The utility model solves the key structural technical problem of the built-in steam pressurizer in the integrated pressurized water reactor. The heat shield technology can be widely used in military and civilian innovative integrated pressurized water reactors. Power propulsion reactor safety is revolutionary.

Description of drawings

Fig. 1 is a schematic view of the longitudinal section of the utility model.

Fig. 2 is a top view structural diagram of the utility model.

Fig. 3 is a schematic cross-sectional structure diagram along the direction A-A in Fig. 1 .

Fig. 4 is a structural schematic view of the utility model installed in a reactor pressure vessel.

Among them, the names of parts corresponding to the reference signs in the figure are:

1-insulation plate body, 2-air interlayer, 3-connector, 4-cylindrical wave hole, 5-radial stiffener, 6-circular stiffener, 7-metal reflector, 8-reactor pressure vessel , 9-reactor coolant supercooled water, 10-built-in stabilizer saturated water.

Detailed ways

The utility model will be described in further detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Example 1

The heat shield of the built-in steam pressurizer of the pressurized water reactor, as shown in Figure 1 and Figure 2, includes the heat shield body 1 composed of double-layer austenitic stainless steel plates forming the air interlayer 2, and the heat shield body 1 arranged on the heat shield body 1 and its upper part are integrally formed and combined to form a connecting body 3 of an inverted hat-shaped composite structure; the heat shield body 1 is provided with a cylindrical undulating hole 4 .

The connecting body 3 is a ring-shaped structure, the inner diameter of the connecting body 3 is the same as the outer diameter of the outer wall of the heat insulating board body 1, and the outer diameter of the outer wall of the heat insulating board body 1 extends upward, and the connecting body 3 is fixed on the heat insulating board body 1 The extended part of the outer wall and the heat shield body 1 and the connecting body 3 are integrally formed. After the heat shield body 1 and the connecting body 3 are combined, the inverted hat-shaped composite structure in the present invention is formed, as shown in FIG. 1 .

In the utility model, the heat shield body 1 and the connecting body 3 are integrally formed, and both are made of austenitic stainless steel. As shown in Figure 2, the internal diameter of the heat shield of the built-in steam pressurizer of the pressurized water reactor is about 2500 mm, and the total thickness is about 350 mm. The thickness of the double-layer austenitic stainless steel plate is set to about 20 mm, and the thickness of the air interlayer 2 It is about 210mm; the diameter of the cylindrical wave hole 4 on the heat shield body 1 is about 140mm. The heat insulation plate of the built-in steam pressurizer of the pressurized water reactor of the utility model is welded in the head of the top cover of the reactor pressure vessel, which is applicable to an integrated pressurized water reactor with a thermal power of 200-1000 MW.

Example 2

The difference between this embodiment and Embodiment 1 is that in this embodiment, the specific structure of the heat shield of the built-in steam pressurizer of the PWR is optimized.

As shown in FIGS. 1 to 3 , the cylindrical undulation hole 4 is located at the center of the heat shield body 1 in this embodiment. In this embodiment, a radial stiffening plate 5, a circumferential stiffening plate 6 and a metal reflective layer 7 are also added, and the specific setting method is as follows:

In this embodiment, the number of the hoop stiffeners 6 is four, which are arranged in the air interlayer 2 and between the cylindrical undulating hole 4 and the connecting body 3. As shown in FIG. 3 , the adjacent cylindrical undulating The thickness of the hoop stiffening plate 6 of the hole 4 is about 40 mm, and the thickness of the other hoop stiffening plates 6 is about 20 mm.

The number of said radial stiffeners 5 is eight, which are evenly distributed on the heat insulation board body 1. One end of the radial stiffeners 5 is connected to the annular stiffener 6 adjacent to the cylindrical wave hole 4, and the other end is Extend to the position of connector 3, as shown in Figure 2 and Figure 3. The radial stiffener 5 has a thickness of about 20 mm.

Through the joint action of the above-mentioned radial stiffening plate 5 and circumferential stiffening plate 6, the air interlayer 2 is effectively divided into 33 cavities, which further blocks air flow and reduces heat transfer efficiency; at the same time, this setting can withstand a high-pressure environment up to 21MPa in the reactor , effectively enhance the degree of pressure resistance.

In order to better insulate heat transfer, that is, in order to effectively reduce the heat transfer caused by radiation, a metal reflective layer 7 made of corrugated mirror stainless steel foil is stacked horizontally in the cavity, as shown in Figure 1, The thickness of the metal reflective layer 7 is about 0.1mm.

Example 3

The difference between this embodiment and Embodiment 1 and Embodiment 2 is that this embodiment applies the built-in steam pressurizer heat shield of the pressurized water reactor in Embodiment 1 or 2 to the pressurized water reactor, and discloses a method for implementing The heat shield in Example 1 or 2 constitutes the structure of an integrated pressurized water reactor, and its specific structure is as follows:

An integrated pressurized water reactor, comprising a reactor pressure vessel 8 with a top cover head 11, a reactor coolant supercooled water 9 located in the reactor pressure vessel 8, a built-in pressurizer saturated water 10 located above the reactor coolant supercooled water 9, And welded in the top cover head 11 is used to separate the reactor coolant supercooled water 9 and the built-in pressurizer saturated water 10 of the heat shield.

The above heat insulation board is the heat insulation board of the built-in steam pressurizer of the PWR described in Embodiment 1 or Embodiment 2.

The foregoing embodiments are only preferred embodiments of the present utility model, and are not limitations of the protection scope of the present utility model, but all the design principles of the present utility model, and the changes made by non-creative work on this basis, all should belong to the present utility model. within the scope of the new protection.

Claims (6)

1. The heat shield of the built-in steam pressurizer of the pressurized water reactor is characterized in that it includes the heat shield body (1) composed of double-layer austenitic stainless steel plates forming the air interlayer (2), and the heat shield set on the heat shield The upper part of the main body (1) is formed integrally with it and combined to form a connecting body (3) of an inverted hat-shaped composite structure; the heat shield main body (1) is provided with a cylindrical wave hole (4). 2. The thermal insulation plate of the built-in steam pressurizer of the PWR according to claim 1, characterized in that: the cylindrical wave hole (4) is located in the central part of the thermal insulation plate body (1). 3. The thermal insulation board of the built-in steam pressurizer of the pressurized water reactor according to claim 1 or 2, characterized in that: the thermal insulation board body (1) is provided with an air interlayer (2) divided into a plurality of spaces The radial stiffener (5) and the hoop stiffener (6) of the cavity. 4. The thermal insulation plate of the built-in steam pressurizer of the pressurized water reactor according to claim 3, characterized in that: a metal reflective layer (7) composed of corrugated mirror stainless steel foil is stacked horizontally in the cavity. 5. The thermal insulation plate of the built-in steam pressurizer of the pressurized water reactor according to claim 4, characterized in that: the air interlayer (2) consists of eight radial stiffeners (5) and four circumferential stiffeners ( 6) Separated into 33 cavities. 6. The integrated pressurized water reactor is characterized in that it includes a reactor pressure vessel (8) with a top cover head (11), a reactor coolant subcooled water (9) located in the reactor pressure vessel (8), and a reactor cooling vessel (9) located in the reactor pressure vessel (8). The built-in regulator saturated water (10) above the agent supercooled water (9), and the welded inside the top cover head (11) is used to separate the reactor coolant supercooled water (9) and the built-in regulator saturated water (10) The heat insulation board; the heat insulation board is the heat insulation board of the built-in steam pressurizer of the pressurized water reactor according to any one of claims 1-5.