JPS61100694A - Cooling facility in container for nuclear reactor - 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 [Field of Application of the Invention] The present invention relates to cooling equipment within a nuclear reactor containment vessel.

[Background of the invention]

FIG. 2 shows one row of the prior art. The cooler 2 installed in the lower part of the reactor containment vessel sucks the gas inside the containment vessel with a fan 5 generated by a blower, cools it with a cooling coil 9, and then cools it with a cooling coil 9. and 14, it is supplied to the inner area 7 of the gamma shield wall 7a, the upper area, the top head 1a, and the inner side 17 of the pedestal 17a at the bottom of the reactor pressure vessel 1b, respectively. After the gas supplied to each area absorbs the heat radiated from the equipment inside the containment vessel 1, it passes through the space inside the containment vessel 1 as shown by the arrow and returns to the cooling coil 9 of the cooler 2 again.

The air in the containment vessel 1 has been replaced with nitrogen gas to prevent the frozen confection gas that may be generated during reactor operation from reacting with oxygen in the air and causing an explosion phenomenon. There is.

, Conventional reactor containment vessel cooling equipment rarely has the above-mentioned configuration, and therefore has the following drawbacks.

α) Since the gamma shield 7a is cooled with a cooler and supplied with low temperature gas after death, the reactor pressure vessel 1
This was uneconomical as it required an increase in the capacity of the cooler due to excessive heat dissipation.

(2) Despite the small amount of heat generated inside the pedestal 17a under the reactor pressure vessel, the relative humidity of the gas inside the pedestal 17a is not rusty due to the supply of low-temperature gas cooled by a cooler. There were six undesirable high corrosion resistance conditions for steel materials.

In order to prevent corrosion of rust-free materials, it is said that the relative humidity of the environment is preferably 20 degrees or less.

(3) Since the temperature of the cooling water used as cooling water for the cooling coil of the cooler is as high as 30 to 35 degrees Celsius, there was no ability to lower the atmospheric dew point temperature required for dehumidification.

(4) Although cold water from a refrigerator is used as the cooling water for the cooler, in this case, the temperature of the cooling gas is low, so there are some areas where the temperature drops, resulting in high relative humidity. The environment was not sufficient for rust-free materials.

In addition, the entire containment vessel is cooled by cold water from the refrigerator cooling,
Considering that the amount of heat generated within the containment vessel is enormous, approximately 1 million Icd/h, it was uneconomical to increase the capacity of the refrigerator unnecessarily.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a containment vessel cooling facility that facilitates maintaining a healthy environment for rustless steel materials within the reactor containment vessel.

[Summary of the invention]

The present invention includes a reactor pressure vessel, a pedestal supporting the reactor pressure vessel, a shield wall surrounding the reactor pressure vessel, a first opening in the pedestal inner space, and a second opening in the shield wall inner space. 40, a duct with other openings each facing above the shield wall, a blower provided in the duct, and a cooling coil of a cooler provided to receive gas flowing by the force of the blower, and storage thereof. In the nuclear power equipment stored in a container, the pedestal is provided with an intake port for venting from the outer periphery of the pedestal to the inside, and the first
In a nuclear reactor containment vessel, the blower is provided in the middle of the duct between the air blower and the second opening, with the discharge direction facing the cooling coil, and the cooling coil is provided in the middle of the duct between the blower and the other opening. This cooling equipment is capable of providing a cooling condition that can ensure the integrity of stainless steel materials without directly supplying cold air to the inner space of the pedestal.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

During reactor operation, the reactor sxb, the pedestal 17a supporting the reactor pressure vessel 1b, and the gamma shield wall 7a surrounding the reactor pressure vessel 1b are contained in the containment vessel l.

Two blowers 5 installed in parallel in the middle of the blower duct 3
A duct 4 disposed in the lower space within the containment vessel l is communicated with the intake port side of the container l. This duct 4 has intake ports 4a and 4b.
, 4c... are open.

Duct 13 branches from the middle of duct 4 and pedestal 1
7a is inserted into the inner space 17, and the opening of the duct 13 faces the pedestal inner space F as an intake port 13a. This intake port 13B is designed to improve ventilation.
Air intake port 1 opened horizontally on the upper side of the pedestal 17a
It is arranged below 7b.

A duct 6 branched from the blower duct 3 has a duct discharge port 6a facing into the space 7 between the 4-mer shield wall 7a and the reactor pressure vessel 1b.

The duct 3 is connected above the branching point of the duct 60 to the cooled gas intake of the cooler 2, which includes a cooling coil 9 and a cooling coil 10, and is stored in the cooled gas outlet of the cooler 2. It is communicated with a duct 11 arranged in the upper space inside the container 1 . In addition, the bypass duct 8 branched from the duct 3 just before the cooled gas intake port does not pass through the cooler 2 side, but is used as a duct route to merge with the blown gas from the cooled gas discharge port side, and is connected to the duct 11. is connected to.

The duct 11 is provided with discharge ports 11a, llb, IIC, . . . that open upward. The duct 11 is connected to a duct 12 having a discharge port 12a inside the top head 1a.

The cooling coil 9 is arranged closer to the blower 5 than the cooling coil 10 is. Cooling water from a reactor auxiliary cooling system, which is conventionally attached to nuclear reactor equipment, is passed through the cooling coil 9 via a pipe 15. Further, cold water having a lower temperature than the aforementioned cooling water from the refrigerator is passed through the cooling coil 10 via a pipe 16. This cold water is
The temperature of the gas in the containment vessel 1 is controlled by a refrigerator so as to be lower than the dew point temperature by cooling with cold water and the aforementioned cooling water.

In this embodiment with the above configuration, when the blower 5 is operated, the gas inside the containment vessel 1 sucked from the intake ports 4a, 4b, . . . is discharged from the discharge port 6a, and as it rises in the space between the shield wall 7a and the reactor pressure vessel 1b, the shield wall 7a
The heat insulating material conventionally provided between the reactor pressure vessel 1b and the shield wall 7a, and the pressure vessel 1b are cooled and passed through upward. The other part is blown to the cooler 2 side,
Some of the air passes through the bypass duct 8 without passing through the cooler 2, and the rest is pre-cooled by the cooling coil 9 of the cooler 2. After pre-cooling, the ventilation is cooled to below the dew point temperature by the cooling coil 10. After being dehumidified, it merges with the ventilation from the bypass duct 8 and enters the duct 11), and is blown out from the discharge ports 11, 11b, etc. to the upper part of the containment vessel 1, thereby reducing the upper part that is susceptible to high temperatures. Cooling. Duct 11
A part of the ventilation inside is diverted to the duct 12 and discharged through the discharge port 12a into the space inside the top head la to cool the inside of the top head la. The discharged cold air descends inside the containment vessel 1, and part of it passes through the intake port 17b and enters the space 17 inside the pedestal 17a, cools the inside of the pedestal, descends further, is sucked into the intake port 13a, and is cooled again. and then recirculated. Therefore, the cold air circulates as shown by the arrows in FIG.

By circulating in this way, strong cooling gas can be passed through the upper part of the containment vessel 1, where the temperature tends to be high, and gas with a relatively low degree of cooling before cooling can be passed from the middle part to the lower part, so that the temperature can be lowered. In addition to being easy to homogenize, since strong cooling gas is not introduced into the pedestal, it is easier to maintain the environmental conditions of the stainless steel material in a good state and ensure its integrity. In addition, the pre-cooling effect reduces the capacity of the refrigerator, making it economical.

The effects of this embodiment can be summarized as follows.

(1) It is possible to equalize the temperature from the middle to the lower area of the containment vessel where there are many stainless steel materials, reduce the relative humidity inside the containment vessel, and maintain the environmental conditions for the rustless steel materials in a satisfactory state.

Q) By cooling the atmosphere by dehumidifying cooling with two types of cooling coils, it is economical because the capacity of the refrigerator that supplies cold water for dehumidification can be reduced.

(3) By supplying high-temperature gas that is not cooled by a cooler into the gamma shield wall, unnecessary heat generation can be suppressed, and the space between the gamma shield and the pressure vessel can be It can be used to reduce the need for air ducts.

(4) By limiting the atmosphere suction port to the lower part, the inside of the pedestal at the lower part of the pressure vessel, which generates relatively little heat, can be maintained in a dry state.

〔Effect of the invention〕

According to the present invention, it is possible to achieve the effect that the inside of the reactor containment vessel can be cooled to improve the environment for the non-rusting steel materials inside the reactor containment vessel.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of a reactor containment cooling facility according to the present invention, and FIG. 2 is an overall schematic diagram of a reactor containment cooling facility according to the prior art.

Claims (1)

[Claims] 1. A reactor pressure vessel, a pedestal supporting the reactor pressure vessel, and a shield wall surrounding the reactor pressure vessel;
A duct having a first opening in the space inside the pedestal, a second opening in the space inside the shield wall, and another opening facing above the shield wall, a blower provided in the duct, and a force of the blower. In a nuclear power facility in which a cooling coil of a cooler provided to receive flowing gas is housed in a containment vessel, the pedestal is provided with an intake port that vents from the outer periphery of the pedestal to the inside, and the first and second
A cooling facility in a nuclear reactor containment vessel, characterized in that the blower is provided in the middle of a duct between the second opening and the other opening, and the cooling coil is provided in the middle of the duct between the second and other openings. 2. The cooling equipment in the containment vessel according to claim 1, characterized in that a cooling coil is disposed in a duct part halfway between the second opening and the other opening. 3. In claim 1, the midway portion of the duct between the second claim and another opening has a parallel ventilation path arrangement in which the duct branches off from the middle and then merges in at least a part of the section, and one of the branched Cooling equipment inside the nuclear reactor containment vessel characterized by placing the cooling coil of the cooler in the side ventilation passage. 4. In claim 1, 2, or 3, the cooling coil includes a first cooling coil through which cooling water at a temperature lower than that required for dehumidification is passed, and the cooling water A nuclear reactor, comprising: a second cooling coil through which cooling water of a higher temperature is passed; the second cooling coil is arranged on the ventilation upstream side of the first cooling coil. Cooling equipment inside the containment vessel.