JPS60635B2 - suppression chamber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a subreduction chamber for storing emergency cooling water in the event of a loss of coolant accident in a boiling water nuclear reactor.

In the case of a conventional boiling water reactor, a condensate storage tank 5 is installed separately from a suppression chamber 3, as shown in FIG. Normally, the water in this condensate storage tank 6 is
It serves as the primary water source for the high-pressure core spray system, which is a make-up water source during reactor isolation and an emergency cooling system in the event of a loss of reactor coolant accident. Therefore, the capacity of the condensate storage tank is the capacity required for normal reactor water level control and main condenser water level control,
In addition, a capacity including the above-mentioned make-up water and cooling water is required, resulting in a large capacity, which has the drawback of making the tank body, its foundation, and the lotus house large and expensive. On the other hand, subreduction chamber 3 stores the amount of water necessary for the depressurization effect in the event of a loss of reactor coolant accident, but the quality of the water is poor and it cannot be used as make-up water during reactor isolation. A separate water source must be installed. The purpose of the present invention is to reduce the capacity of the condensate storage tank by providing the suppression chamber with the function of a condensate storage tank, and to more efficiently and economically obtain purified water as a water source. The aim is to overcome the drawbacks of the conventional technology.

That is, in view of the fact that water of good quality is required as make-up water during reactor isolation and as the first water source for the high-pressure core spray system, the present invention divides the conventional suppression chamber into two chambers, and A water purification device is connected to one of the water source water storage sides of the room, and one room is used to store clean water for the make-up water source during reactor isolation and the first water source for the high-pressure reactor spray system. There are characteristics. The details of the configuration will be explained below based on the drawings. FIG. 2 is a schematic perspective view of a nuclear power plant according to the present invention, in which 1 is a nuclear reactor, 2 is a containment vessel, 3 is a suppression chamber, 4 is a downcomer, and 6 is a view showing the interior of the suppression chamber 3. This is a partition wall built in the same shape that divides and defines the chamber, and the partition wall 4 divides the subrepression chamber 3 into an inner chamber 3a and an outer chamber 4a.

However, this division by partition walls is not necessarily limited to the case where the partitions are defined in the same zero shape. Therefore, dirty water such as cleaning water drainage flows through the inner chamber 3a, and clean water, which is used as make-up water during reactor isolation and as the first water source for the high-pressure core spray system, flows through the outer chamber 3b. Store water.

Note that the downcomer 4 is installed in both the inner chamber 3a and the outer chamber 3b to perform the pressure reduction function in the event of a reactor coolant loss accident, which is the original purpose of the suppression chamber 3. A water purification device as shown in FIG. 3 is connected to the outer chamber 3b shown in FIG. 2 to ensure water purification, and the so-called subrection chamber outer chamber 3b is A circuit including a purifier 7 and a pump 9 was connected to keep the water in the outer chamber 3b clean at all times.

FIG. 4 shows yet another embodiment, in which a conventionally used spent fuel pool purification device 8 is used in place of the purification device 7 in FIG. It purifies water and is advantageous in that there is no need to install a new purification device.

The illustrated reference numeral 1 indicates a make-up water supply pipe during reactor isolation, and 11 indicates a high-pressure core spray water supply pipe.

As explained above, according to the present invention, clean water stored in one chamber after the suppression chamber is defined can be used as make-up water during reactor isolation and as the first water source for the high-pressure core spray system. This has the effect of reducing the capacity of the condensate storage tank by the amount of water.In addition, by installing a purification device in a room that stores water source water, it is possible to efficiently and economically reduce the capacity of the condensate storage tank by the amount of water. Clean water can always be stored.

[Brief explanation of drawings]

Figure 1 of the drawings is a schematic diagram of a conventional nuclear power plant, Figure 2 is a schematic perspective view of a nuclear power plant according to the present invention, and Figure 3 is a longitudinal section showing a state in which a purification device is connected to the outer chamber of Figure 2. FIG. 4 is a schematic diagram showing another embodiment of the present invention. Explanation of symbols, 1... Nuclear reactor, 2... Containment vessel,
3... Subrection chamber, 3a... Inner chamber, 3b.
...outer room, 4...downcomer, 5...
... Condensate storage tank, 6 ... Bulkhead, 7, 8 ...
... Purification device, 9 ... Pump, 10 ... Reactor isolation make-up water supply pipe, 11 ... High pressure core spray water supply pipe. Figure 2 Figure 4 Figure 4

Claims (1)

[Scope of Claims] 1. In a boiling water nuclear reactor having a condensate storage tank and a suppression chamber, the suppression chamber is divided into two chambers, and the reactor is isolated in one of the two chambers. 1. A suppression chamber for storing make-up water and water source water for a high-pressure core spray system, and further comprising a water purification device connected to said one chamber in which said water source water is stored. 2. The suppression chamber according to claim 1, wherein an existing spent fuel pool water purification device is used as the purification device.