JPH0211664Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to the structure of an explosion valve used, for example, in a boric acid water injection system of a nuclear power plant.

[Technical background of the invention]

Generally, in a nuclear power plant, in the event that a control rod cannot be inserted into the reactor core, boric acid water, which is a neutron absorbing material, is rapidly injected into the reactor core from a boric acid water storage tank. A boric acid water injection system is installed to bring the reactor to a safe cold shutdown.

The explosion valve inserted in this boric acid water injection system is
It operates by passing an electric current through the ignition wire to explode the gunpowder, and the impact causes the sear plug to drop and open the valve.

In addition, in this explosion valve, a minute current is constantly passed through the ignition wire, and the presence of this minute current confirms the integrity of the ignition wire before the valve is activated. It is necessary to confirm that the ignition wire was broken due to an explosion of gunpowder due to the loss.

[Problems with background technology]

However, in the ignition section of a conventionally used explosion valve, for example, as shown in FIG. 4.It has a structure that is inserted inside.

Therefore, when the activation switch 5 is pressed and current is applied from the power source 6 to the ignition wire 3 to explode the gunpowder in the gunpowder container 4, the sea plug 7 is pushed down by the impact of the explosion and the ignition wire 3 is cut off at the same time. Sometimes the cut ends of the ignition wire 3 are short-circuited or the valve box 1
In many cases, there was no change in the minute current flowing from the power source to the high resistor 8 and detector 9 side.

Therefore, the confirmation lamp 10 continues to be lit in the same state as before the explosion valve was activated due to the output contact from the minute current detector 9 when a minute current is present, making it impossible to confirm that the ignition line 3 has been disconnected, that is, that the valve has opened. There was a problem.

[Purpose of invention]

The present invention has been made to solve such problems, and its purpose is to provide an explosion valve that can reliably confirm both the soundness of the ignition line and the operation before the valve is activated.

[Summary of the invention]

That is, in the present invention, the upper part of the sear plug is extended into the gunpowder tank, both ends of the ignition wire are fixed to the extending part of the sear plug, and both ends are removably connected to the power supply plug provided on the valve cover. This is an explosion valve characterized by:

[Example of idea]

The present invention will be described in detail below based on an embodiment shown in the drawings.

As shown in FIG. 2, in the explosion valve of the present invention, the upper part of the sear plug 11 protrudes into the explosive tank 12, both ends of the ignition wire 14 are firmly fixed to the studs 13, and the upper edge of the valve body 15 is connected to the power source. A supply plug 16 is placed.

The stud 13 also includes a power supply wiring 17 into which a minute current detector (not shown) or the like is inserted.
Plug-in connector 1 provided on power supply plug 16
8, and a minute current is constantly flowing from the power supply wiring 17 through the plug-in connector 18 to the ignition wire 14.

In an explosion valve having such a structure, the integrity of the ignition line 14 before valve operation is clearly confirmed by the presence of a minute current detected by a minute current detector.

On the other hand, the current for igniting the gunpowder is connected to the plug-in connector 1.
8 to the ignition line 14, the gunpowder tank 12
The gunpowder inside explodes, and the impact pushes down the sear plug 11, and at the same time, the plug-in connector 1
The ignition wire 14 separates from the power supply wiring 17 at a portion 8. As a result, the minute current flowing through the ignition wire 14 is cut off, and since the minute current is no longer detected by the minute current detector, it is reliably confirmed that the valve has operated.

[Effect of idea]

As is clear from the above description, in the explosion valve of the present invention, the health of the ignition wire before valve operation and the open state of the valve after operation are determined by detecting the presence or absence of a minute current flowing through the ignition wire. You can know for sure. Therefore, it is suitable as an explosion valve inserted into, for example, a boric acid water injection system of a nuclear power plant.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating the structure and operation of a conventionally used explosion valve, and FIG. 2 is a longitudinal sectional view of an embodiment of the present invention. 1,15... Valve box, 2... Fixed plug, 3,1
4...Ignition line, 4,12...Gunpowder tank, 7,11...
...Shear plug, 9...Minimum current detector, 10...
... Confirmation lamp, 13 ... Stud, 16 ... Power supply plug, 18 ... Plug-in connector.

Claims (1)

[Scope of utility model registration request] In an explosion valve, the upper end of a shear plug is inserted into a gunpowder tank formed between a valve box and a valve cover, and an ignition wire is inserted into the gunpowder tank, and the explosion of the gunpowder pushes down the sear plug and opens the valve. The upper part of the ignition wire extends into the gunpowder tank, both ends of the ignition wire are fixed to the extension, and both ends of the ignition wire are detachably connected to a power supply plug provided on the valve cover. An explosion valve featuring: