GB2524453A - Safety injection system of hot leg of nuclear power station - Google Patents
Safety injection system of hot leg of nuclear power station Download PDFInfo
- Publication number
- GB2524453A GB2524453A GB1513533.8A GB201513533A GB2524453A GB 2524453 A GB2524453 A GB 2524453A GB 201513533 A GB201513533 A GB 201513533A GB 2524453 A GB2524453 A GB 2524453A
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- GB
- United Kingdom
- Prior art keywords
- hot leg
- safety injection
- pipeline
- electric isolating
- isolating valve
- 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.)
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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
-
- 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
A safety injection system (100, 200, 300) of a hot leg of a nuclear power station comprises a hot leg connection pipeline (10) provided with two electric isolating valves (101, 102) arranged at an interval as well as a hot leg safety injection pipeline (20, 50, 60) provided with at least one check valve (201, 202, 501, 601). Two ends of the hot leg safety injection pipeline (20, 50, 60) are connected to the hot leg connection pipeline (10) respectively, so that the check valve (201, 202, 501, 601) on the hot leg safety injection pipeline is in parallel connection with at least one of the two electric isolating valves (101, 102) of the hot leg connection pipeline (10). The safety injection system (100, 200, 300) is simple to configure, maintain and low in maintenance cost; further, the success probability of the hot leg safety injection after the accident happens is greatly improved, and values of CDF and LRF are effectively reduced.
Description
SPECIFICATION
SAFETY INJECTION SYSTEM OF A HOT LEG OF A NUCLEAR POWER STATION
FIELD OF THE INVENTION
100011 The present invention generally relates to nuclear power safety devices and, more particularly, to a safety injection system of a hot leg of a nuclear power station which can improve the success probability of the hot leg safety injection under safety accident conditions.
BACKGROUND OF THE INVENTION
[0002] Tn conventional designs of a nuclear power station, RTS system and R}IR system are combined with each other, so that the RTS system can run in RHR system manner to take away the residual heat of the reactor under normal condition or safety accident condition. After combination of the MS system and the RHR system, hot leg injection pipeline of the RTS system and the hot leg water intake pipeline of the RHR system are combined into one. There is no need to dispose a separate RHR system and, thereby simplifying equipment and improving the economy of a nuclear power station.
[0003] During operation of a nuclear power station at a normal power, the RTS system is separated from the hot leg of the primary circuit of a reactor coolant system via two electric isolating valves provided on the combined pipeline. In nonnal shutdown condition, when the pressure and the temperature of the primary circuit is reduced to the access condition of the RHR system, discharge of the residual heat is realized via opening the two electrical isolating valves. In safety accident condition, when the hot leg safety injection function is needed to be carried out, an operator opens the two electric isolating valves in the master control room, so that the water containing boron can be injected via the hot leg. In other words, whether the electric isolating valves can be successfully opened or not determines the success of the safety injection of the hot leg.
100041 Combination of illS system and RHR system can save equipment and improve economical efficiency of the nuclear power station due to omission of the separate RHR system. Howevei when carrying out the hot leg safety injection function, the operator needs to manually open the two RCPB isolating valves. Due to the poor conditions in the containment when safety accident occurs, it is possible that the two isolating valves cannot be opened successfully. In addition, the two RCPB isolating valves are both electric isolating valves, failure of the electrical system may lead to the electric isolating valves cannot be opened successfully, which may induce failure of the hot leg safety injection.
100051 What is needed, therefore, is to provide a safety injection system of a hot leg of a nuclear power station which can improve the success probability of the hot leg safety injection under safety accident conditions.
BRIEF SUMMARY OF VARIOUS ThlBODIJ'1ENTS OF THE INVENTION 100061 One object of the present invention is to provide a safety injection system of a hot leg of a nuclear power station which can improve the success probability of the hot leg safety injection under accident conditions.
[0007] According to one embodiment of the present invention, a safety injection system of a hot leg of a nuclear power station is provided. The safety injection system includes a hot leg connection pipeline having two electric isolating valves arranged at an interval and a hot leg safety injection pipeline provided with at least one check valve.
Two ends of the hot leg safety injection pipeline are connected to the hot leg connection pipeline respectively, such that the at least one check valve on the hot leg safety injection pipeline is in parallel connection with at least one electric isolating valve on the hot leg connection pipeline.
[0008] According to one aspect of the present invention, one end of the hot leg connection pipeline is connected to a low pressure safety injection pipeline, the other end of the hot leg connection pipeline is connected to a hot leg of a primary circuit of a reactor coolant system, and the two electric isolating valves includes a first electric isolating valve close to the low pressure safety injection pipeline and a second electric isolating valve close to a hot leg of the primary circuit of the reactor coolant system.
[0009] According to one aspect of the present invention, the hot leg safety inj ection pipeline is provided with two check valves arranged at an interval, and the two check valves are in parallel connection with the first electric isolating valve and the second electric isolating valve.
[0010] According to one aspect of the present invention, one end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the low pressure safety injection pipeline and the first electric isolating valve, the other end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the second electric isolating valve and a hot leg of a primary circuit of a reactor coolant system, and the two check valves are in parallel connection with the first electhc isolating valve and the second electric isolating valve.
[0011] According to one aspect of the present invention, the hot leg safety injection pipeline is provided with a check valve in parallel connection with the first electric isolating valve.
[0012] According to one aspect of the present invention, one end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the low pressure safety injection pipeline and the first electric isolating valve, the other end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the first electric isolating valve and the second electric isolating valve, and the check valve is in parallel connection with the first electric isolating valve.
[0013] According to one aspect of the present invention, the hot leg safety injection pipeline is provided with a check valve in parallel connection with the second electric isolating valve.
[0014] According to one aspect of the present invention, one end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the first electric isolating valve and the second electric isolating valve, the other end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the second electric isolating valve and a hot leg of a primary circuit of a reactor coolant system.
[0015] According to the one embodiment of the present invention, a separate hot leg safety injection pipeline is provided, so that water intake function and water injection function of the RUR hot leg are separated from each other and do not affect each other The two check valves provided on the separate hot leg safety injection pipeline can be used to separate the hot leg safety injection pipeline from the primary circuit of the reactor coolant system under normal operating conditions. When safety accident occurs, the two check valves need neither manual operation of an operator nor an electrical system as a power source. The safety injection system according to the embodiment of the present invention not only has a simple configuration and a low maintenance cost, but a'so can remarkably improve the success probability of the hot leg safety injection after the safety accident occurs and greatly reduce the values of CDF (Core Damage Frequency) and LRF (Large Release Frequency).
100161 Other advantages and novel features will be drawn from the following detailed description of preferred embodiments with the attached drawings. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with a general description of the invention given above, and the detailed description of the embodiments given below, serve to explain the principles of the invention:
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Fig. I depicts a first embodiment of a safety injection system of a hot leg of a nuclear power station of the present invention; 100181 Fig. 2 depicts a second embodiment of a safety injection system of a hot leg of a nudear power station of the present invention; and IS [0019] Fig. 3 depicts a third embodiment of a safety injection system of a hot leg of a nuclear power station of the present invention.
DETAiLED DESCRIPTION OF vious EMBODIMENTS OF THE
INVENTION
[0020] Example embodiments of the present invention will now be described more fhlly hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown, Tndeed, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like reference numerals refer to like elements throughout.
[0021] Referring to Fig. I, a safety injection system IOU of a hot leg of a nuclear power station according to a first embodiment of the present invention is illustrated. The safety injection system 100 includes a hot leg connection pipeline 10 and a hot leg safety injection pipeline 20. One end of the hot leg connection pipeline 10 is connected to a low pressure safety injection pipeline 30. The other end of the hot leg connection pipeline 10 is connected to a hot leg 44 of a primary circuit 40 of a reactor coolant system.
[0022] The primary circuit 40 of the reactor coolant system includes a reactor core 41, a steam generator 42, a main pump 43, a hot leg 44, a cold segment 45 and a transition segment 46. The hot leg 44 is configured to connect the reactor core 41 and the steam generator 42. The cold segment 45 is configured to connect the reactor core 41 and the main pump 43. The transition segment 46 is configured to connect the main pump 43 and the steam generator 42.
[0023] The hot leg connection pipeline 10 is provided with a first electric isolating valve 101 and a second electric isolating valve 102 arranged at an interval. The first electric isolating valve 101 is close to the low pressure safety injection pipeline 30. The second electric isolating valve 102 is close to the hot leg 44 of the primary circuit 40 of the reactor coolant system.
[0024] Two ends of the hot leg safety injection pipeline 20 are connected to the hot leg connection pipeline 10 respectively. The hot leg safety injection pipeline 20 is equipped with two check valves 201, 202. One end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline 10 at a location between the low pressure safety injection pipeline 30 and the first electric isolating valve 101. The other end of the hot leg safety injection pipeline 20 is connected to the hot leg connection pipeline 10 at a location between the second electric isolating valve 102 and the hot leg 44 of the primary circuit 40 of the reactor coolant system. In this case, the two check valves 201, 202 are in parallel connection with the first electric isolating valve 101 and the second electric isolating valve 102.
[0025] According to the first embodiment of the present invention, a separate hot leg safety injection pipeline 20 is provided, so that water intake thnction and water injection function of the RHR hot leg are separated from each other and do not affect each other.
The two check valves 201, 202 provided on the separate hot leg safety injection pipeline can be used to separate the hot leg safety injection pipeline 20 from the primary circuit of the reactor coolant system under normal openting conditions. When safety accident occurs, the two check valves 201, 202 need neither manual operation of an operator nor an electrical system as a power source. The safety injection system according to the first embodiment of the present invention not only has a simple configuration and a low maintenance cost, but also can remarkably improve the success probability of the hot leg safety injection after the safety accident occurs and greatly reduce the values of CDF and LRF.
100261 Referring to Fig. 2, a safety injection system 200 of a hot leg of a nuclear power station according to a second embodiment of the present invention is illustrated.
The safety injection system 200 includes a hot leg connection pipeline 10 and a hot leg safety injection pipeline 50, One end of the hot leg connection pipeline lOis connected to a low pressure safety injection pipeline 30. The other end of the hot leg connection pipeline 10 is connected to a hot leg 44 of a primary circuit 40 of a reactor coolant system.
[0027] The hot leg connection pipeline 10 is provided with a first electric isolating valve 101 and a second electric isolating valve 102 arranged at an interval. The first electric isolating valve 101 is close to the low pressure safety injection pipeline 30. The second electric isolating valve 102 is close to the hot leg 44 of the primary circuit 40 of the reactor coolant system.
[0028] Two ends of the hot leg safety injection pipeline 50 are connected to the hot leg connection pipeline 10 respectively. The hot leg safety injection pipeline 50 is equipped with a check valve 501. One end of the hot leg safety injection pipeline 50 is connected to the hot leg connection pipeline ID at a location between the low pressure safety injection pipeline 30 and the first electric isolating valve 101. The other end of the hot leg safety injection pipeline 50 is connected to the hot leg connection pipeline 10 at a location between the first electric isolating valve 101 and the second electric isolating valve 102. Tn this case, the check valve 501 is in parallel connection with the first electric isolating valve 101.
100291 According to the second embodiment of the present invention, when hot leg injection function is needed to be carried out under medium or large LOCA accident condition, there is no need to manually open the first electric isolating valve 101 and the second electric isolating valve 102 at the same time. Only manual opening of the second electric isolating valve 102 is needed. k this case, the success probability of the hot leg safety injection after the safety accident occurs can also be improved remarkably.
[0030] Referring to Fig. 3, a safety injection system 300 of a hot leg of a nuclear power station according to a third embodiment of the present invention is illustrated. The safety injection system 300 includes a hot leg connection pipeline 10 and a hot leg safety injection pipeline 60. One end of the hot leg connection pipeline lOis connected to a low pressure safety injection pipeline 30. The other end of the hot leg connection pipeline 10 is connected to a hot leg 44 of a primary circuit 40 of a reactor coolant system.
100311 The hot leg connection pipeline 10 is provided with a first electric isolating valve 101 and a second electric isolating valve 102 arranged at an interval. The first electric isolating valve 101 is close to the low pressure safety injection pipeline 30. The second electric isolating valve 102 is close to a hot leg 44 of a primary circuit 40 of the reactor coolant system.
100321 Two ends of the hot leg safety injection pipeline 60 are connected to the hot leg connection pipeline 10 respectively The hot leg safety injection pipeline 60 is equipped with a check valve 601. One end of the hot leg safety injection pipeline 60 is connected to the hot leg connection pipeline 10 at a location between the first electric isolating valve 101 and the second electric valve 102. The other end of the hot leg safety injection pipeline 60 is connected to the hot leg connection pipeline 10 at a location between the second electric isolating valve 102 and the hot leg 44 of the primary circuit 40 of the reactor coolant system. In this case, the check valve 601 is in parallel connection with the second electric isolating valve 102.
[0033] According to the third embodiment of the present invention, when hot leg injection function is needed to be carried out under medium or large LOCA accident condition, there is no need to manually open the first electric isolating valve 101 and the second electric isolating valve 102 at the same time, Only manual opening of the first electric isolating valve 101 is needed. In this case, the success probability of the hot leg safety injection after the safety accident occurs can also be improved remarkably.
[0034] Many modifications and other embodiments of the inventions set forth herein will come to mind to one skilled in the art to which these inventions pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Moreover, although the foregoing descriptions and the associated drawings describe example embodiments, it should be appreciated that alternative embodiments without departing from the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
- WHAT IS CLAINIED IS: 1 A safety injection system of a hot leg of a nuclear power station, comprising a hot leg connection pipeline provided with two electric isolating valves arranged at an interval and a hot leg safety injection pipeline provided with at least one check valve, two ends of the hot leg safety injection pipeline are connected to the hot leg connection pipeline respectively, and the at least one check valve on the hot leg safety injection pipeline is in parallel connection with at least one electric isolating valve on the hot leg connection pipeline.
- 2. The safety injection system of a hot leg of a nuclear power station of claim 1, wherein one end of the hot leg connection pipeline is connected to a low pressure safety injection pipeline, the other end of the hot leg connection pipeline is connected to a hot leg of a primary circuit of a reactor coolant system, and the two electric isolating valves comprises a first electric isolating valve close to the low pressure safety injection pipeline and a second electric isolating valve close to the hot leg of the primary circuit of the reactor coolant system.
- 3. The safety injection system of a hot leg of a nuclear power station of claim 2, wherein the hot leg safety injection pipeline is provided with two check valves arranged at an interval, and the two check valves are in parallel connection with the first electric isolating valve and the second electric isolating valve.
- 4. The safety injection system of a hot leg of a nuclear power station of claim 3, wherein one end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the low pressure safety injection pipeline and the first e'ectric isolating valve, the other end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the second electric isolating valve and a hot leg of the primary circuit of the reactor coolant system, and the two check valves are in parallel connection with the first electric isolating valve and the second electric isolating valve.
- 5. The safety injection system of a hot leg of a nuclear power station of claim 2, wherein the hot leg safety injection pipeline is provided with a check valve in parallel connection with the first electric isolating valve.
- 6. The safety injection system of a hot leg of a nuclear power station of claim 5, wherein one end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the low pressure safety injection pipeline and the First e'ectric isolating valve, the other end of the hot leg safety injection pipeline is connected IS to the hot leg connection pipeline at a location between the first electric isolating valve and the second electric isolating valve, and the check valve is in parallel connection with the first electric isolating valve.
- 7, The safety injection system of a hot leg of a nuclear power station of claim 2, wherein the hot leg safety injection pipeline is provided with a check valve in parallel connection with the second electric isolating valve.
- 8. The safety injection system of a hot leg of a nuclear power station of claim 7, wherein one end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the first electric isolating valve and the second electric isolating valve, the other end of the hot leg safety injection pipeline is connected to the hot leg connection pipeline at a location between the second electric isolating valve and a hot leg of a primary circuit of a reactor coolant system.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204684241U CN203366763U (en) | 2013-08-01 | 2013-08-01 | Safety injection system of hot leg of nuclear power station |
| PCT/CN2013/087741 WO2015014047A1 (en) | 2013-08-01 | 2013-11-24 | Safety injection system of hot leg of nuclear power station |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201513533D0 GB201513533D0 (en) | 2015-09-16 |
| GB2524453A true GB2524453A (en) | 2015-09-23 |
| GB2524453B GB2524453B (en) | 2020-06-17 |
Family
ID=49814494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1513533.8A Active GB2524453B (en) | 2013-08-01 | 2013-11-24 | Safety injection system of a hot leg of a nuclear power station |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN203366763U (en) |
| GB (1) | GB2524453B (en) |
| WO (1) | WO2015014047A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090154635A1 (en) * | 2007-12-18 | 2009-06-18 | Korea Plant Service & Engineering Co., Ltd. | Drainage apparatus and drainage method for reactor coolant system |
| CN101079333B (en) * | 2006-05-26 | 2010-07-14 | 中国核动力研究设计院 | Nuclear reactor non-energy and multi-function pool voltage-stabling system |
| CN102034559B (en) * | 2010-09-19 | 2012-08-01 | 中广核工程有限公司 | Rapid mutual-backup system of nuclear power station and mutual-backup method thereof |
| CN202948735U (en) * | 2012-12-03 | 2013-05-22 | 中核核电运行管理有限公司 | Structure for increasing inner pressure of blocked pipe section |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102867549B (en) * | 2012-09-27 | 2017-05-10 | 中国核电工程有限公司 | Reactor cavity water injection cooling system with combination of active and passive power |
-
2013
- 2013-08-01 CN CN2013204684241U patent/CN203366763U/en not_active Expired - Fee Related
- 2013-11-24 GB GB1513533.8A patent/GB2524453B/en active Active
- 2013-11-24 WO PCT/CN2013/087741 patent/WO2015014047A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079333B (en) * | 2006-05-26 | 2010-07-14 | 中国核动力研究设计院 | Nuclear reactor non-energy and multi-function pool voltage-stabling system |
| US20090154635A1 (en) * | 2007-12-18 | 2009-06-18 | Korea Plant Service & Engineering Co., Ltd. | Drainage apparatus and drainage method for reactor coolant system |
| CN102034559B (en) * | 2010-09-19 | 2012-08-01 | 中广核工程有限公司 | Rapid mutual-backup system of nuclear power station and mutual-backup method thereof |
| CN202948735U (en) * | 2012-12-03 | 2013-05-22 | 中核核电运行管理有限公司 | Structure for increasing inner pressure of blocked pipe section |
Non-Patent Citations (2)
| Title |
|---|
| New Technology and New Products of China, No. 6, 31 March 2012, X Hao, "Comparison and Analysis of the Safety Systems of AP1000 and M310", page 253 * |
| Nuclear Power Engineering Vol. 32, No. 4, 31 August 2011, M Yang et al, "Study on Quantitative Reliability Analysis by Multilevel Flow Models for Nuclear Power Plants", pages 72-76 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN203366763U (en) | 2013-12-25 |
| GB201513533D0 (en) | 2015-09-16 |
| WO2015014047A1 (en) | 2015-02-05 |
| GB2524453B (en) | 2020-06-17 |
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