JPS59195191A - Feedwater reactor for atomic power plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a nuclear reactor make-up water supply system for a nuclear power plant.

[Technical background of the invention and its problems]

The reactor make-up water supply system for a conventional boiling water 119 water type nuclear power plant has a 4' near 11, 7' 1. It is composed of a regular make-up water supply device ↑1 and an emergency make-up water supply device 1l112. Among these, the regular 4iti water supply system e, 1 supplies makeup water (water supply) from the regular water source 4 stored in the condensate storage tank 3 with the condensate transfer pump 5, and supplies water (not shown) from the makeup water amount 'θ6. The water is supplied to the reactor pressure vessel 7 blue via a pump, feed water heater, etc. A storage space containing eight emergency water sources is defined in the lower part of the condensate storage tank 3, and a large capacity emergency water source 10 is also stored in the suppression sol 9 as an emergency core cooling system.

On the other hand, the emergency make-up water supply system (δ2 is the emergency water source 8 of the condensate storage tank 3 or the emergency water source 10 of the suppression sol 9
Make-up water is supplied from the reactor pressure vessel 7 to the reactor pressure vessel 7 through an emergency sanitary water pipe 13. The emergency make-up water supply device 2 normally uses the emergency water source 8 in the condensate storage tank 3 as make-up water for the reactor, and the water level in the storage tank 3 is detected by a tank water level gauge 15.

When the tank water level gauge 15 detects a low water level in the condensate storage tank 3, the tank outlet Fm' and valve 16 are closed, and the pool outlet electric valve (water source switching valve) 17 is opened.
The sub-Vtshondur 9 yen emergency water source 10 will be used as make-up water for nuclear reactors.

By the way, the regular make-up water supply system 1 is required to supply a large amount of make-up water during periodic inspections of nuclear power plants. For this reason, a large amount of maximum intermittent water supply 111j at the time of regular plant inspection is ensured and maintained in the regular water source 4 of the condensate storage tank 3, and the regular water source 4 is configured to have a large capacity structure.

Normal operation of the nuclear power plant (In order to maintain the replenishment function of the emergency make-up water supply device 2 so that the emergency water source 8 will not be lost even if the regular make-up water supply device 1 is damaged, An emergency water source 8 is formed in the lower part of the condensate storage tank 3, and a regular water source 4 is formed in the main part of the tank, which are separated vertically and independently.For this reason, the condensate storage tank 3 has a very high height. It becomes a large tank.On the other hand, the emergency water source 8
The lifted condensate storage tank 3 is A for emergency measures.
Class earthquake resistance is required. In this case, increasing the size of the water storage tank 3 is not only disadvantageous in terms of earthquake resistance, but also often disadvantageous in terms of plant building layout space, which is limited to 4 ri.

In fact, at the nuclear power plant in Kaku'kame in one prefecture, the capacity of the regular water source (water supply) is equivalent to the make-up water during normal operation of the plant.
is about half of the amount of acid + uJ water supply during regular plant inspections, and about half of the regular water source 4 in the condensate storage tank 3 is empty space.

For this reason, the spatial space -61S of the regular water source 4 is not effectively used in the nuclear power plant and becomes a so-called dead space. This has led to the question of how to configure the four-water storage tank in order to effectively utilize the space and further improve the earthquake resistance of the four-water storage tank.

[Purpose of the invention]

The present invention takes into consideration the above-mentioned points '-f', improves earthquake resistance by downsizing the condensate storage tank, and improves the effective use of space within the nuclear power plant. The purpose is to provide a reactor make-up water supply system.

[Embodiments of the invention]

Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings.

FIG. 2 is a system diagram showing a reactor make-up water supply system for a nuclear power plant according to the present invention, and this reactor make-up water supply system supplies regular make-up water (water supply) to the reactor pressure vessel 20
91 and an emergency makeup water supply device 22 that supplies regular makeup water. Regular make-up water equipment grave 1ifi 21 is transferred from the regular water source line of the condensate storage tank path to the reactor pressure vessel supply, etc. by the regular water supply 26 via the unconstructed feed water heater tochi by the condensate transfer pump O. Regular make-up water (premium water) is supplied into this pressure vessel 20. A tank outlet valve 27 is provided on the outlet side of the condensate storage tank of the regular water supply pipe 26.

On the other hand, the emergency make-up water supply device 22 supplies water from the emergency water source 28 of the condensate storage tank to the reactor pressure vessel 2 by maintaining the water supply pump 29 and injecting water into the reactor pressure vessel 2 by the water amount α30.
On the other hand, an emergency water source 32 in the suppression pool 31 is also connected to the emergency water supply pipe 30 by an emergency water supply pipe 33 on the pump suction side of the reactor make-up water pump 29 . Emergency water supply piping: 53 always has a 1λ pool outlet! An auxiliary valve 34 is provided.

In addition, the emergency water supply piping 30 is provided with a tank outlet valve 35 and a tank outlet valve 36 in series, and both valves 3! j, 36 ff1l to connecting pipe 3
7 is branched, and this communication pipe 37 has a communication valve 3 in the middle.
8 is provided, and the other end is connected to the water supply pipe A on the suction side of the condensate transfer pump B. By providing the communication line 37, the non-filling water source 28 in the condensate storage tank 23 can be shared with the regular water source 24, and both water sources can be used mutually. This means that an emergency water source can be included within the regular water mud 24. As a result, the condensate storage tank B can be made smaller and the tank capacity can be reduced, so the taste of the tank can be reduced accordingly and the corrosion resistance can be improved can be improved.

Further, a tank water level gauge 39 for detecting the water level of condensate is provided in the condensate storage tank path. The tank water level gauge 391 is electrically connected to the water transfer pump O, the tank outlet valve 36, and the pool outlet electric valve 34, and controls the operation of the condensate transfer pump 5 and the like based on the output signal thereof. For example, when the tank water level gauge 39 detects a low tank water level, the tank outlet valve 36 is closed and the pool outlet electric valve 34 is opened.

Next, the operation of the present invention will be explained.

During normal operation of the nuclear power plant, the communication valve 38 is closed to separate the regular water source row and the emergency water source 27 independently. The reactor is operated by using the regular water source 24, and supplies the condensate (1 credit make-up water) in the regular water source row to the reactor pressure vessel 20 etc. through the condensate transfer pump 5, and operates the reactor. let If local damage occurs to the regular make-up water system 21 during normal operation of the plant, an emergency water source is secured in the condensate storage tank channel, so this emergency water source is utilized. Emergency make-up water from the emergency water source is supplied into the reactor pressure vessel by the emergency make-up water supply device 22.

On the other hand, during plant regular inspections of nuclear power awakening plants, tank outlet 1, valve 3 is closed, and pool outlet 1, valve 3 is closed.
4 is opened, the emergency water source is diverted to the pool water 32 in the suppression pool 31, and the pool water in the suppression pool 31 is secured as the emergency water source 32.

After securing the emergency water source 32, the communication valve 333 is opened, and the entire condensate stored in the condensate storage tank n is used as a regular water source, and the maximum amount of intermittent make-up water required at the time of plant regular inspection is condensed. Supplies okara to each load in the nuclear power plant, such as the storage tank and reactor pressure vessel m.

For example, in the case of a nuclear power generation plant with a demand of 1.1 million, the maximum amount of intermittent replenishment water used as a regular water source during regular plant inspections is limited to Temporarily, it corresponds to the amount of water for athlete's foot to fill 6 bits and the reactor pressure vessel with water, and is approximately 2,300 m2.
Since the value of reactor make-up water as an emergency water source is approximately 700 m3, the tank capacity of condensate storage tank 3 was conventionally approximately 30 m3.
00 m3 was required. In contrast, in the present invention, the emergency water volume of 700 m3 of the condensate storage tank 23 is shared with the storage space of the water source of 2300 m3, so that the tank capacity can be reduced to 2300 m3 of the regular water source volume.
It is possible to set it to m3.

〔Effect of the invention〕

As described above, the reactor make-up water supply system for a nuclear power plant according to the present invention can store condensate by sharing the storage space for the emergency water source and the regular water source formed in the condensate acid tank. Since the capacity of the tank can be significantly reduced and the tank can be made smaller, equipment costs can be reduced and space within the plant building of the nuclear power plant can be effectively utilized.

In addition, since the condensate storage tank can be made smaller, the seismic resistance can be improved.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a conventional reactor makeup water supply system for a nuclear power plant, and FIG. 2 is a system diagram showing a preferred embodiment of the reactor makeup water supply system for a nuclear power plant according to the present invention. be. 20... Reactor pressure vessel, 21... Regular use bucket, water supply direct, 22... Emergency make-up water device, 23... 1 anti-water storage tank, U... Regular water source, 5 ...Condensate transfer pump, 26...〃d water pipe (makeup water pipe), road...Emergency water source 7, 29...Reactor make-up water pump, 30...
Emergency supplementary water 1-Electrical goods, 31...Saturation pool, 32...Non'+4 water source, 34...Fool outlet electric valve, 36...Tank outlet 'tortoise valve. 〇8IOJ

Claims (1)

[Claims] 1. A regular make-up water supply device that supplies a regular water source stored in a condensate storage tank to each load in a nuclear power plant;
In the reactor make-up water supply system for a nuclear power plant, which has the condensate storage tank and an emergency make-up water supply system device for supplying the emergency water source stored in the suppression pool to the reactor pressure vessel, the condensate storage The emergency water source formed in the tank and the regular water source share a storage space, and the regular water supply piping of the regular makeup water supply device and the emergency water supply piping of the emergency makeup water supply device can be communicated in a connected arrangement. Reactor make-up water supply system for a nuclear power plant, which is on special leave for being connected to. 2. Connection U connects the suction side of the condensate transfer pump of the regular water supply piping and the suction side of the reactor make-up water pump of the emergency water supply piping, and has a communication valve in the middle, Claim 1 Reactor make-up water pump system for nuclear power plants as described in Section 1. 3. The emergency make-up water supply system has a condensate storage 51 (the emergency water source of the tank and the emergency water source of the suppression pool are connected to the tank outlet, Eu valve and the pool outlet/tongue valve on the suction side of the reactor make-up water pump). A reactor make-up water supply system for a nuclear power plant according to claim 1, which communicates with each other through a cell. 4. During normal operation of a nuclear power plant, the connecting valve is closed to supply condensate and oxygen. A reactor make-up water supply system for a nuclear power plant according to claim 1, in which a regular water source and an emergency water source in a tank are configured independently. 5. During regular inspections of a nuclear power plant, the communication valve A patent claim in which the pool outlet 'sleep valve is opened and the tank outlet 't4 valve is closed, the tool water in the saturation pool is used as an emergency water source, and the entire condensate in the condensate storage tank is used as a regular water source. A nuclear reactor make-up water supply system for a nuclear power plant according to item 3.