GB2531840A - In-containment refueling water tank having rinsing function - Google Patents

In-containment refueling water tank having rinsing function Download PDF

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Publication number
GB2531840A
GB2531840A GB1509159.8A GB201509159A GB2531840A GB 2531840 A GB2531840 A GB 2531840A GB 201509159 A GB201509159 A GB 201509159A GB 2531840 A GB2531840 A GB 2531840A
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GB
United Kingdom
Prior art keywords
containment
rinsing
water tank
pool
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1509159.8A
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GB2531840B (en
GB201509159D0 (en
Inventor
Shi Xueyao
Zhou Zhe
Zhang Huimin
Liu Jianping
Zhan Jingxiang
Chen Qiaoyan
Yang Changjiang
Wang Jun
Guo Qiang
Wang Shimin
Han Xiaofeng
Yuan Yidan
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China Nuclear Power Engineering Co Ltd
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China Nuclear Power Engineering Co Ltd
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Filing date
Publication date
Application filed by China Nuclear Power Engineering Co Ltd filed Critical China Nuclear Power Engineering Co Ltd
Publication of GB201509159D0 publication Critical patent/GB201509159D0/en
Publication of GB2531840A publication Critical patent/GB2531840A/en
Application granted granted Critical
Publication of GB2531840B publication Critical patent/GB2531840B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/18—Emergency cooling arrangements; Removing shut-down heat
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C1/00—Reactor types
    • G21C1/04—Thermal reactors ; Epithermal reactors
    • G21C1/06—Heterogeneous reactors, i.e. in which fuel and moderator are separated
    • G21C1/08—Heterogeneous reactors, i.e. in which fuel and moderator are separated moderator being highly pressurised, e.g. boiling water reactor, integral super-heat reactor, pressurised water reactor
    • G21C1/086—Pressurised water reactors
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C13/00—Pressure vessels; Containment vessels; Containment in general
    • G21C13/02—Details
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C9/00—Emergency protection arrangements structurally associated with the reactor, e.g. safety valves provided with pressure equalisation devices
    • G21C9/004—Pressure suppression
    • G21C9/012—Pressure suppression by thermal accumulation or by steam condensation, e.g. ice condensers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)

Abstract

An in-containment refueling water tank having a rinsing function, consisting of an in-containment refuelling water tank 1 and a rinsing pool 2 arranged side by side. The in-containment refuelling water tank is linked to the rinsing pool through a water injecting pipeline 3 on the bottom and an overflow pipeline 5 below the upper water level; and a gas-intake pipeline 6 connected to the atmosphere of the containment and a gas-exhaust pipeline 8 connected to a filtering and exhausting system of the containment are provided in the rinsing pool. This adds an extra rinsing function while guaranteeing the function of the in-containment refueling water tank. A check valve 4 may be mounted on the water injecting line, so that water can only flow into the rinsing pool. The gas intake pipeline may be exposed to the atmosphere of the containment at one end and connected to a bubbler 7 at the lower end. An exhausting micro-pore 9 may be formed within the rinsing pool.

Description

IN-CONTAINMENT REFUELING WATER TANK HAVING RINSING
FUNCTION
Field of the Invention
The present invention relates to a safety system of a nuclear power plant, in particular to an in-containment refueling water tank having a rinsing function.
Descriptions of the Related Art
Refueling water tanks for nuclear power plants, as important facilities for storage of water source for containment safety injection systems, containment spray systems, are of great importance to insure the safety of nuclear power plants.
The existing third-generation nuclear power plants, for example, AP1000, EPR, ACP1000, are all designed with in-containment refueling water tanks. That is, a refueling water tank is placed within the containment, so as to avoid the risk of failure when switching to the sump in the containment after the refueling water tank outside the containment is out of water.
Once a severe accident occurs in a nuclear power plant, a large amount of radioactive fission product from the reactor core will be released into the containment. The containment is provided to prevent the release of radioactive fission product to the environment. And, once a severe accident occurs in a nuclear power plant, generally the generation of non-condensable gas is accompanied, causing increased temperature and pressure in the containment; and when the pressure in the containment exceeds a certain threshold, it is likely to cause the loss of containment integrity due to overpressure and thus release of a large amount of radioactive fission product to the environment.
An approach to mitigate the long-term temperature and pressure increasing in the containment is usually to allow the gas within the containment to pass through the filtering and exhausting system for removal of the radioactive fission product, and then the gas is exhausted to the environment. As the gas within the containment in a high temperature and pressure contains a large amount of vapor (over 70%), the filtering and exhausting system of the containment needs to be continuously water-supplemented with and cooled, so as to maintain the filtering efficiency of the filtering and exhausting system.
SUMMARY OF THE INVENTION
In view of technical defects in the prior art, an object of the present invention is to provide an in-containment refueling water tank having a rinsing function. When the containment performs an operation of filtering and exhausting, gas flowing through the filtering and exhausting system of the containment is first allowed to pass through the rinsing pool of the in-containment refueling water tank to be cooled so that the vapor in the gas is condensed. Thereby, the enthalpy value of gas flowing through the filtering and exhausting system of the containment is greatly reduced, the service time of the filtering and exhausting system of the containment is prolonged, and the risk of failure of the filtering and exhausting system of the containment due to lack of in-time water supplement thereto is reduced.
The technical scheme adopted by the present invention is: an in-containment refueling water tank having a rinsing function is provided, consisting of two parts arranged side by side, i.e., a typical in-containment refueling water tank and a rinsing pool, wherein the typical in-containment refueling water tank is linked to the rinsing pool through a water injecting pipeline on the bottom and an overflow pipeline below the upper water level; and a gas-intake pipeline linked to the atmosphere of a containment and a gas-exhaust pipeline connected to the filtering and exhausting system of the containment are provided in the rinsing pool.
Further, the in-containment refueling water tank having a rinsing function as described above, wherein a check valve is mounted on the water injecting pipeline so that water can only flow to the rinsing pool from the typical in-containment refueling water tank.
Further, the in-containment refueling water tank having a rinsing function as described above, wherein the end of overflow pipeline which is in the typical in-containment refueling water tank is below the water level, and the other end which is in the rinsing pool is at the bottom of the pool.
Further, the in-containment refueling water tank having a rinsing function as described above, wherein the upper end of the gas-intake pipeline is connected to the atmosphere of the containment, while the lower end thereof is connected to a bubbler; and the bubbler is located below the water level of the rinsing pool and above the entrance of the overflow pipeline by the side of the rinsing pool.
Further, the in-containment refueling water tank having a rinsing function as described above, wherein the lower end of the gas-exhaust pipeline is located on the top of a gas space of the rinsing pool, while the upper end is connected to the filtering and exhausting system of the containment.
Further, the in-containment refueling water tank having a rinsing function as described above, wherein an exhausting micro-pore is formed within the rinsing pool, with one side of the exhausting micro-pores being located on the top of the gas space of the rinsing pool and the other side thereof being connected to the atmosphere of the containment.
Further, the in-containment refueling water tank having a rinsing function as described above, wherein the inner wall of the rinsing pool is covered by a steel liner having air-tightness.
The advantageous effects of the present invention are as follows: in the present invention, while guaranteeing the function of the typical in-containment refueling water tank, when a filtering and exhausting operation is deployed in the containment, the high-temperature and high-pressure gas within the containment is rinsed by water within the rinsing pool so that the concentration of vapor (over 70%) in the containment is effectively decreased, the temperature of gas is lowered, and meanwhile the content of radioactive aerosol in gas is reduced. By rinsing within the rinsing pool, both the enthalpy value and the rate of gas flowing through the filter in the filtering and exhausting system of the containment are effectively reduced, so that the service time of the filtering and exhausting system of the containment is prolonged, and the filtering efficiency of the filter in the filtering and exhausting system of the containment is improved. As a result, once a severe accident occurs in a nuclear power plant, the probability of a large release of radioactive fission product due to the failure of the filtering and exhausting system is significantly decreased, the radioactive release to the environment is reduced, and considerable economical and social benefits are achieved.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a structural schematic view of an in-containment refueling water tank having a rinsing function according the present invention, in which: 1: typical in-containment refueling water tank; 2: rinsing pool; 3: water injecting pipeline; 4: check valve; 5: overflow pipeline; 6: gas-intake pipeline; 7: bubbler; 8: gas-exhaust pipeline; and 9: exhausting micro-pore.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Below is a detailed description of the present invention in connection with the accompanying drawings and the preferred embodiments.
As shown in Fig. 1, an in-containment refueling water tank having a rinsing function provided by the present invention consists of two parts arranged side by side, i.e., a typical in-containment refueling water tank 1 and a rinsing pool 2, with the interior of the rinsing pool 2 being covered by a steel liner having air-tightness. The typical in-containment refueling water tank 1 is linked to the rinsing pool 2 through a water injecting pipeline 3 on the bottom of the pool and an overflow pipeline 5 below the upper water level. A check valve 4 is mounted on the water injecting pipeline 3 so that water can only flow to the rinsing pool 2 from the typical in-containment refueling water tank 1. The end of overflow pipeline 5 which is in the typical in-containment refueling water tank 1 is below the water level, and the other end which is in the rinsing pool 2 is at the bottom of the pool.
In the rinsing pool 2, a gas-intake pipeline 6, a bubbler 7, a gas-exhaust pipeline 8 and an exhausting micro-pore 9 are further included. The upper end of the gas-intake pipeline 6 is connected to the atmosphere of the containment, while the lower end thereof is connected to a bubbler 7; and the bubbler 7 is located below the water level of the rinsing pool, while above the entrance of the overflow pipeline 5 by the side of the rinsing pool 2. One side of the gas-exhaust pipeline 8 is located on the top of a gas space of the rinsing pool 2, while the other side thereof is connected to the filtering and exhausting system of the containment. One side of the exhausting micro-pores 9 is located on the top of the gas space of the rinsing pool and the other side thereof is connected to the atmosphere of the containment.
During the initial operation period of a nuclear power plant, when water is injected into the typical in-containment refueling water tank 1, water in the typical in-containment refueling water tank enters the rinsing pool 2 through the check valve 4 and the water injecting pipeline 3; and when the water level in the typical refueling water tank exceeds the overflow pipeline 5, gas within the rinsing pool 2 is exhausted through the exhausting micro-pore 9.
During the normal operation of the nuclear power plant, the typical in-containment refueling water tank 1 and the rinsing pool 2 have an equal water level, which is above the overflow pipeline 5 and above the bubbler 7. Check valve 4 is normally closed. An isolating check valve between the gas-exhaust pipeline 8 and the filtering and exhausting system of the containment is closed, to maintain the isolation of the containment from the environment.
Once an accident occurs in the nuclear power plant, a safety injection system and a containment spray system will get water from the typical in-containment refueling water tank 1, so as to inject water to the reactor core and the reactor to cool them, respectively. When the water level in the typical in-containment refueling water tank drops below the overflow pipeline 5, due to the effect of the check valve 4,check valve, water within the rinsing pool will not flow outside, thereby ensuring a water level required by its operation.
Once a severe accident occurs in the nuclear power plant, a large amount of radioactive substance is released into the containment. When the cooling system of the containment breaks down and the generation of non-condensable gas is generated, temperature and pressure in the containment are increasing. When a pressure for activating the filtering and exhausting system of the containment is reached, the operator opens a check valve between the gas-exhaust pipeline 8 and the filtering and exhausting system of the containment, to perform an operation of filtering and exhausting to the containment according to an instruction. At this moment, due to high pressure in the containment, the pressure difference between the containment and the environment is much higher than the pressure difference caused by the different height between the water level of the rinsing pool and the bubbler.
Furthermore, as the height of the bubbler 7 is higher than the height of the overflow pipeline 5 within the rinsing pool, gas within the containment enters below the water level within the rinsing pool through the gas-intake pipeline 6 and the bubbler 7, and is then dispersed into many small bubbles which are in sufficient contact with the water within the rinsing pool. As a result, the vapor over 70% in gas within the containment is greatly condensed, and the temperature of gas within the containment is lowered. Meanwhile, with the condensing of the vapor, part of radioactive aerosol is also dissolved in the water.
Gas within the containment enters the gas space of the rinsing pool after being rinsed by the water in the rinsing pool 2, and then enters the filtering and exhausting system of the containment through the gas-exhaust pipeline 8, and is finally exhausted to the environment after being filtered by the filtering and exhausting system.
Apparently, it may be appreciated by those skilled in the art that various modifications and variations may be made to the present invention without departing from the spirit and scope of the present invention. Thus, the present invention is intended to embrace those modifications and variations if those modifications and variations are within the scope defined by the appended claims and equivalents thereof.

Claims (7)

  1. CLAIMS1. An in-containment refueling water tank having a rinsing function, consisting of two parts arranged side by side, i.e., a typical in-containment refueling water tank (1) and a rinsing pool (2), wherein the typical in-containment refueling water tank (1) is linked to the rinsing pool (2) through a water injecting pipeline (3) on the bottom and an overflow pipeline (5) below the upper water level; and a gas-intake pipeline (6) linked to the atmosphere of a containment and a gas-exhaust pipeline (8) linked to a filter and exhausting system of the containment are provided in the rinsing pool (2).
  2. 2. The in-containment refueling water tank having a rinsing function as claimed in claim 1, wherein a check valve (4) is mounted on the water injecting pipeline (3) so that water can only flow to the rinsing pool (2) from the typical in-containment refueling water tank (I).
  3. 3. The in-containment refueling water tank having a rinsing function as claimed in claim 1, wherein the end of overflow pipeline (5) which is in the typical in-containment refueling water tank (1) is below the water level, and the other end which is in the rinsing pool (2) is at the bottom of the pool(2).
  4. 4. The in-containment refueling water tank having a rinsing function as claimed in claim 3, wherein the upper end of the gas-intake pipeline (6) is connected to the atmosphere of the containment, while the lower end thereof is connected to a bubbler (7); and the bubbler (7) is located below the water level of the rinsing pool, and above an entrance of the overflow pipeline (5) by one side of the rinsing pool (2).
  5. 5. The in-containment refueling water tank having a rinsing function as claimed in claim 1, wherein the lower end of the gas-exhaust pipeline (8) is located on the top of a gas space of the rinsing pool, while the upper end is connected to the filtering and exhausting system of the containment.
  6. 6. The in-containment refueling water tank having a rinsing function as claimed in claim 1, wherein an exhausting micro-pore (9) is formed within the rinsing pool (2), with one side of the exhausting micro-pores (9) being located on the top of the gas space of the rinsing pool and the other side thereof being connected to the atmosphere of the containment.
  7. 7. The in-containment refueling water tank having a rinsing function as claimed in claim 1, wherein the inner wall of the rinsing pool (2) is covered by a steel liner having air-tightness.
GB1509159.8A 2014-06-04 2015-05-28 In-containment refueling water tank having rinsing function Active GB2531840B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410244308.0A CN104078085B (en) 2014-06-04 2014-06-04 A kind of built-in material-changing water tank of containment with water scrub function

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GB201509159D0 GB201509159D0 (en) 2015-07-15
GB2531840A true GB2531840A (en) 2016-05-04
GB2531840B GB2531840B (en) 2017-02-08

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Cited By (1)

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EP3522175A4 (en) * 2016-09-30 2020-03-11 Korea Hydro & Nuclear Power Co., Ltd Coolant tank, and passive containment cooling system comprising same

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CN106297931B (en) * 2016-08-20 2018-03-06 中国船舶重工集团公司第七一九研究所 A kind of radioaerosol high-efficient purification retracting device and its method of work
WO2018068767A1 (en) * 2016-10-14 2018-04-19 中广核工程有限公司 Internally installed refuelling water storage tank for nuclear-power-plant containment
JP6737957B2 (en) * 2016-11-28 2020-08-12 フラマトム ゲゼルシャフト ミット ベシュレンクテル ハフツング Nuclear power plant with containment venting system with filter
CN108154945A (en) * 2016-12-06 2018-06-12 中广核研究院有限公司 A kind of system that containment gas filtration discharge is realized under major accident operating mode
CN107393612A (en) * 2017-07-31 2017-11-24 江苏华洋新思路能源装备股份有限公司 The passive opposite opened exhaust cap of material-changing water tank built in nuclear power generating sets containment
CN111744334A (en) * 2020-07-31 2020-10-09 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) Radioactive waste gas discharge system suitable for ocean nuclear power platform
CN113436770B (en) * 2021-05-27 2024-06-07 广东核电合营有限公司 Waste gas treatment method, equipment and medium based on nuclear power station waste liquid treatment system

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Also Published As

Publication number Publication date
GB2531840B (en) 2017-02-08
GB201509159D0 (en) 2015-07-15
CN104078085A (en) 2014-10-01
CN104078085B (en) 2016-10-05

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