CN103400607B - Nuclear power plant reactor coolant system vacuum pumping method - Google Patents
Nuclear power plant reactor coolant system vacuum pumping method Download PDFInfo
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- CN103400607B CN103400607B CN201310329545.2A CN201310329545A CN103400607B CN 103400607 B CN103400607 B CN 103400607B CN 201310329545 A CN201310329545 A CN 201310329545A CN 103400607 B CN103400607 B CN 103400607B
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- reactor coolant
- relief tank
- pressurizer relief
- coolant loop
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- 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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Abstract
The invention discloses a kind of nuclear power plant reactor coolant system vacuum pumping method, it comprises the following steps: step (): in the unit maintenance period, first by emptying in pressurizer relief tank, utilizes vacuum pump to be evacuated by pressurizer relief tank state; And step (two): when unit vacuumizing and exhausting starts, by the valve open on associated line between reactor coolant loop and pressurizer relief tank, meanwhile, utilize vacuum pump to bleed to reactor coolant loop.Nuclear power plant reactor coolant system vacuum pumping method of the present invention is by shifting to an earlier date emptying pressurizer relief tank, when making to utilize vacuum pump to vacuumize reactor coolant loop, pressurizer relief tank can holding portion gas and shorten pumpdown time of vacuum pump, achieving when not changing original system configuration, reducing pumpdown time, improve the object of nuclear power station economy.
Description
Technical field
The invention belongs to technical field of nuclear power, more particularly, the present invention relates to a kind of less nuclear power plant reactor coolant system vacuum pumping method consuming time.
Background technology
Before nuclear power station unit starting, need the exhaust of reactor coolant loop water-filling, the non-condensable gas especially in vertical steam generator inverted U pipe.At present, the nuclear power plant of vertical steam generator is adopted to adopt static exhaust to add dynamically (associating) to be vented or the mode of vacuumizing and exhausting completes the exhaust work of primary Ioops.By contrast, static exhaust adds the time that dynamically (associating) is vented and obviously will be longer than vacuumizing and exhausting; Vacuumizing and exhausting can shorten evacuation time, improves the availability of nuclear power station.
Conventional method for vacuumizing and exhausting is that main pipeline semicanal water level runs, vacuum pump is utilized to bleed from the exhaust line at top cover of reactor pressure vessel and voltage stabilizer top, when primary Ioops pressure reaches about 0.2barabs, start to prepare reactor coolant loop water-filling, after this carry out when the water-filling of reactor coolant loop and air pump.But, in above process, utilize vacuum pump first reactor coolant loop to be evacuated to 0.2barabs and still can expend the more time.
Time due to vacuumizing and exhausting is limited by the volume of reactor coolant loop headroom and the volume of vacuum pump, for the nuclear power plant adopting vacuumizing and exhausting, the headroom of maintenance period reactor coolant loop can not reduce, and for a change the capacity replacing vacuum pump of vacuum pump is also a kind of uneconomic way.
In view of this, necessary provide a kind of can when not changing original system configuration, effectively reduce pumpdown time and improve the nuclear power plant reactor coolant system vacuum pumping method of nuclear power station business efficiency.
Summary of the invention
The object of the invention is to: provide a kind of can when not changing original system configuration, effectively reduce pumpdown time and improve the nuclear power plant reactor coolant system vacuum pumping method of nuclear power station business efficiency.
In order to realize foregoing invention object, the invention provides a kind of nuclear power plant reactor coolant system vacuum pumping method, it comprises the following steps:
Step (one): in the unit maintenance period, first by emptying in pressurizer relief tank, utilizes vacuum pump to be evacuated by pressurizer relief tank state; And
Step (two): when unit vacuumizing and exhausting starts, by the valve open on associated line between reactor coolant loop and pressurizer relief tank, meanwhile, utilize vacuum pump to bleed to reactor coolant loop; When the headroom pressure in reactor coolant loop is close to pressure in pressurizer relief tank, pressurizer relief tank is led to the valve closing on the air guide pipeline of reactor coolant loop, vacuum pump continues to bleed to reactor coolant loop.
One as nuclear power plant reactor coolant system vacuum pumping method of the present invention is improved, and described step () is subdivided into following steps again:
(1) in the unit maintenance period, after pressurizer relief tank maintenance, open the drain valve of pressurizer relief tank, after pressurizer relief tank is emptying, the drain valve of pressurizer relief tank is closed;
(2) by the valve closing on reactor coolant loop exhaust line, pressurizer relief tank is led to the valve open on the air guide pipeline of vacuum pump, open vacuum pump to bleed to pressurizer relief tank, become after vacuum state until pressurizer relief tank, vacuum pump is stopped transport, closes pressurizer relief tank towards the valve on the air guide pipeline of vacuum pump simultaneously.
One as nuclear power plant reactor coolant system vacuum pumping method of the present invention is improved, and described step (two) is subdivided into following steps again:
(3) after the preparation that unit carries out vacuumizing and exhausting, the valve that the valve on reactor coolant loop exhaust line, pressurizer relief tank lead on the air guide pipeline of reactor coolant loop is all opened, and opens vacuum pump;
(4) when the headroom pressure in reactor coolant loop is close to pressure in pressurizer relief tank, pressurizer relief tank is led to the valve closing on the air guide pipeline of reactor coolant loop;
(5) allow the valve on reactor coolant loop exhaust line be held open state, vacuum pump runs, and continues to bleed to reactor coolant loop, until the pressure of reactor coolant loop is reduced to setting.
One as nuclear power plant reactor coolant system vacuum pumping method of the present invention is improved, the air guide pipeline that described pressurizer relief tank leads to vacuum pump is same pipeline with it towards the air guide pipeline of reactor coolant loop, and the valve on described air guide pipeline is isolation valve.
One as nuclear power plant reactor coolant system vacuum pumping method of the present invention is improved, and described step () is subdivided into following steps again:
(1) in the unit maintenance period, after pressurizer relief tank maintenance, open the drain valve of pressurizer relief tank, after pressurizer relief tank is emptying, the drain valve of pressurizer relief tank is closed;
(2) by the valve closing on reactor coolant loop exhaust line, by the valve open on pressurizer relief tank exhaust line, open vacuum pump to bleed to pressurizer relief tank, become after vacuum state until pressurizer relief tank, vacuum pump is stopped transport, closes the valve on pressurizer relief tank exhaust line simultaneously.
One as nuclear power plant reactor coolant system vacuum pumping method of the present invention is improved, and described step (two) is subdivided into following steps again:
(3) after the preparation that unit carries out vacuumizing and exhausting, the valve on reactor coolant loop exhaust line, pressurizer relief tank are all opened towards to the reverse checkvalve on the air guide pipeline of reactor coolant loop, and opened vacuum pump;
(4) described pressurizer relief tank leads to the valve on the air guide pipeline of reactor coolant loop is reverse checkvalve, when the headroom pressure in reactor coolant loop is slightly less than the pressure in pressurizer relief tank, pressurizer relief tank is closed automatically towards to the reverse checkvalve on the air guide pipeline of reactor coolant loop;
(5) allow the valve on reactor coolant loop exhaust line be held open state, vacuum pump runs, and continues to bleed to reactor coolant loop, until the pressure of reactor coolant loop is reduced to setting.
One as nuclear power plant reactor coolant system vacuum pumping method of the present invention is improved, and described pressurizer relief tank exhaust line refers to that pressurizer relief tank is connected to the dedicated vent pipes line of vacuum pump, and the valve on it is isolation valve.
One as nuclear power plant reactor coolant system vacuum pumping method of the present invention is improved, described reactor coolant loop comprises voltage stabilizer and pressure vessel, and the valve on reactor coolant loop exhaust line refers to the isolation valve on voltage stabilizer top vent pipeline and the isolation valve on pressure vessel top vent pipeline.
Compared with prior art, nuclear power plant reactor coolant system vacuum pumping method of the present invention is by shifting to an earlier date emptying pressurizer relief tank, when making to utilize vacuum pump to vacuumize reactor coolant loop, pressurizer relief tank can holding portion gas and shorten pumpdown time of vacuum pump, thus achieve when not changing original system configuration, reduce pumpdown time, improve the object of nuclear power station economy.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, nuclear power plant reactor coolant system vacuum pumping method of the present invention is described in detail, wherein:
Fig. 1 is the process principle figure of nuclear power plant reactor coolant system vacuum pumping method first embodiment of the present invention.
Fig. 2 is the process principle figure of nuclear power plant reactor coolant system vacuum pumping method second embodiment of the present invention.
Embodiment
In order to make goal of the invention of the present invention, technical scheme and Advantageous Effects thereof more clear, below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.Should be understood that, the embodiment described in this instructions is only used to explain the present invention, is not intended to limit the present invention.
Nuclear power plant reactor coolant system vacuum pumping method provided by the invention comprises the following steps:
Step (one): in the unit maintenance period, first by emptying in pressurizer relief tank, utilizes vacuum pump to be evacuated by pressurizer relief tank state; And
Step (two): when unit vacuumizing and exhausting starts, by the valve open on associated line between reactor coolant loop and pressurizer relief tank, meanwhile, utilize vacuum pump to bleed to reactor coolant loop; When the headroom pressure in reactor coolant loop is close to pressure in pressurizer relief tank, pressurizer relief tank is led to the valve closing on the air guide pipeline of reactor coolant loop, vacuum pump continues to bleed to reactor coolant loop.
Refer to shown in Fig. 1, the principle of work of nuclear power plant reactor coolant system vacuum pumping method first embodiment of the present invention is as follows:
Step (one): in the unit maintenance period, first by emptying in pressurizer relief tank 10, utilize vacuum pump 20 to be evacuated by pressurizer relief tank 10 state, particularly, step () is subdivided into following steps again:
(1), in the unit maintenance period, after pressurizer relief tank 10 overhauls, open the drain valve 12 of pressurizer relief tank 10, after pressurizer relief tank 10 is emptying, the drain valve 12 of pressurizer relief tank 10 is closed;
(2) isolation valve 44,46 on the isolation valve 34,36 on voltage stabilizer 30 top vent pipeline 32 and pressure vessel 40 top vent pipeline 42 cuts out; Isolation valve 14 on the air guide pipeline 13 of pressurizer relief tank 10 is opened, opens vacuum pump 20 pairs of pressurizer relief tanks 10 and bleed, after pressurizer relief tank 10 becomes vacuum state, vacuum pump 20 is stopped transport, close isolation valve 14 simultaneously;
Step (two): when unit vacuumizing and exhausting starts, by the valve open on associated line between reactor coolant loop and pressurizer relief tank 10, meanwhile, utilizes vacuum pump 20 pairs of reactor coolant loops to bleed.
Particularly, step (two) is subdivided into following steps again:
(3) after the preparation that unit carries out vacuumizing and exhausting, the isolation valve 34,36,44,46,14 between reactor coolant loop and pressurizer relief tank 10 is all opened, and opens vacuum pump 20;
(4) when the headroom pressure in reactor coolant loop is close to pressure in pressurizer relief tank 10, isolation valve 14 cuts out;
(5) allow isolation valve 34,36,44,46 be held open state, vacuum pump 20 runs, and continues to bleed to reactor coolant loop, until the pressure of reactor coolant loop is reduced to setting.
Refer to shown in Fig. 2, the principle of work of nuclear power plant reactor coolant system vacuum pumping method second embodiment of the present invention is as follows:
Step (one): in the unit maintenance period, first by emptying in pressurizer relief tank 10a, utilizes vacuum pump 20a to be evacuated by pressurizer relief tank 10a state.
Particularly, step () is subdivided into following steps again;
(1), in the unit maintenance period, after pressurizer relief tank 10a overhauls, open the drain valve 12a of pressurizer relief tank 10a, after pressurizer relief tank 10a is emptying, the drain valve 12a of pressurizer relief tank 10a is closed;
(2) two isolation valves 44a, 46a on two isolation valves 34a, 36a on voltage stabilizer 30a top vent pipeline 32a and pressure vessel 40a top vent pipeline 42a are closed; The isolation valve 16a be connected to by pressurizer relief tank 10a on vacuum pump 20a dedicated vent pipes line 15a opens; Open vacuum pump 20a to bleed to pressurizer relief tank 10a, after pressurizer relief tank 10a becomes vacuum state, vacuum pump 20a is stopped transport, close isolation valve 16a simultaneously;
Step (two): when unit vacuumizing and exhausting starts, by the valve open on associated line between reactor coolant loop and pressurizer relief tank 10a, meanwhile, utilizes vacuum pump 20a to bleed to reactor coolant loop.
Particularly, step (two) is subdivided into following steps again:
(3) after the preparation that unit carries out vacuumizing and exhausting, isolation valve 34a, 36a, 44a, 46a on reactor coolant loop exhaust line and pressurizer relief tank 10a is all opened towards to the reverse checkvalve 14a on the air guide pipeline 13a of reactor coolant loop, closedown pressurizer relief tank 10a is connected to the isolation valve 16a on vacuum pump 20a dedicated vent pipes line 15a only, and opens vacuum pump 20a;
(4) when the headroom pressure in reactor coolant loop is slightly less than the pressure in pressurizer relief tank 10a, pressurizer relief tank 10a closes automatically towards to the reverse checkvalve 14a on the air guide pipeline 13a of reactor coolant loop;
(5) allow isolation valve 34a, 36a, 44a, 46a be held open state, vacuum pump 20a runs, and continues to bleed to reactor coolant loop, until the pressure of reactor coolant loop is reduced to setting.
Known by describing above, the present invention is when carrying out step (two), because the pressure of reactor coolant loop is higher than the pressure in pressurizer relief tank 10,10a, therefore the non-condensable gas in reactor coolant loop can flow to pressurizer relief tank 10,10a, thus the pressure of reactor coolant loop is reduced gradually, the pressure of pressurizer relief tank 10,10a raises gradually.Meanwhile, recycling vacuum pump 20,20a bleed to reactor coolant loop, can effectively reduce vacuumizing and exhausting required time.
When the pressure of reactor coolant loop is close to pressure in pressurizer relief tank 10,10a, pressurizer relief tank 10,10a can not help exhaust, now, by isolation valve 14 or reverse checkvalve 14a by pressurizer relief tank 10, isolate between 10a and reactor coolant loop, the pipeline of bleeding between vacuum pump 20,20a and pressurizer relief tank 10,10a is also isolated by isolation valve 14 or reverse checkvalve 14a simultaneously.Vacuum pump 20,20a can continue to bleed to reactor coolant loop, until the pressure of reactor coolant loop is reduced to setting.
Compared with prior art, nuclear power plant reactor coolant system vacuum pumping method of the present invention is by shifting to an earlier date emptying pressurizer relief tank 10,10a, make to utilize vacuum pump 20,20a is when vacuumizing reactor coolant loop, pressurizer relief tank 10,10a can holding portion gases and shorten pumpdown time of vacuum pump 20,20a, thus achieve when not changing original system configuration, reduce pumpdown time, improve nuclear power station economy.
According to above-mentioned principle, the present invention can also carry out suitable change and amendment to above-mentioned embodiment.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this instructions, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (8)
1. a nuclear power plant reactor coolant system vacuum pumping method, is characterized in that, comprises the following steps:
Step (one): in the unit maintenance period, first by emptying in pressurizer relief tank, utilizes vacuum pump to be evacuated by pressurizer relief tank state; And
Step (two): when unit vacuumizing and exhausting starts, by the valve open on associated line between reactor coolant loop and pressurizer relief tank, meanwhile, utilize vacuum pump to bleed to reactor coolant loop; When the headroom pressure in reactor coolant loop is close to pressure in pressurizer relief tank, pressurizer relief tank is led to the valve closing on the air guide pipeline of reactor coolant loop, vacuum pump continues to bleed to reactor coolant loop.
2. nuclear power plant reactor coolant system vacuum pumping method according to claim 1, is characterized in that, described step () is subdivided into following steps again:
(1) in the unit maintenance period, after pressurizer relief tank maintenance, open the drain valve of pressurizer relief tank, after pressurizer relief tank is emptying, the drain valve of pressurizer relief tank is closed;
(2) by the valve closing on reactor coolant loop exhaust line, pressurizer relief tank is led to the valve open on the air guide pipeline of vacuum pump, open vacuum pump to bleed to pressurizer relief tank, become after vacuum state until pressurizer relief tank, vacuum pump is stopped transport, closes pressurizer relief tank towards the valve on the air guide pipeline of vacuum pump simultaneously.
3. nuclear power plant reactor coolant system vacuum pumping method according to claim 2, is characterized in that: described step (two) is subdivided into following steps again:
(3) after the preparation that unit carries out vacuumizing and exhausting, the valve that the valve on reactor coolant loop exhaust line, pressurizer relief tank lead on the air guide pipeline of reactor coolant loop is all opened, and opens vacuum pump;
(4) when the headroom pressure in reactor coolant loop is close to pressure in pressurizer relief tank, pressurizer relief tank is led to the valve closing on the air guide pipeline of reactor coolant loop;
(5) allow the valve on reactor coolant loop exhaust line be held open state, vacuum pump runs, and continues to bleed to reactor coolant loop, until the pressure of reactor coolant loop is reduced to setting.
4. nuclear power plant reactor coolant system vacuum pumping method according to claim 3, it is characterized in that, the air guide pipeline that described pressurizer relief tank leads to vacuum pump is same pipeline with it towards the air guide pipeline of reactor coolant loop, and the valve on described air guide pipeline is isolation valve.
5. nuclear power plant reactor coolant system vacuum pumping method according to claim 1, is characterized in that, described step () is subdivided into following steps again:
(1) in the unit maintenance period, after pressurizer relief tank maintenance, open the drain valve of pressurizer relief tank, after pressurizer relief tank is emptying, the drain valve of pressurizer relief tank is closed;
(2) by the valve closing on reactor coolant loop exhaust line, by the valve open on pressurizer relief tank exhaust line, open vacuum pump to bleed to pressurizer relief tank, become after vacuum state until pressurizer relief tank, vacuum pump is stopped transport, closes the valve on pressurizer relief tank exhaust line simultaneously.
6. nuclear power plant reactor coolant system vacuum pumping method according to claim 5, is characterized in that, described step (two) is subdivided into following steps again:
(3) after the preparation that unit carries out vacuumizing and exhausting, the valve on reactor coolant loop exhaust line, pressurizer relief tank are all opened towards to the reverse checkvalve on the air guide pipeline of reactor coolant loop, and opened vacuum pump;
(4) described pressurizer relief tank leads to the valve on the air guide pipeline of reactor coolant loop is reverse checkvalve, when the headroom pressure in reactor coolant loop is slightly less than the pressure in pressurizer relief tank, pressurizer relief tank is closed automatically towards to the reverse checkvalve on the air guide pipeline of reactor coolant loop;
(5) allow the valve on reactor coolant loop exhaust line be held open state, vacuum pump runs, and continues to bleed to reactor coolant loop, until the pressure of reactor coolant loop is reduced to setting.
7. nuclear power plant reactor coolant system vacuum pumping method according to claim 5, is characterized in that, described pressurizer relief tank exhaust line refers to that pressurizer relief tank is connected to the dedicated vent pipes line of vacuum pump, and the valve on it is isolation valve.
8. the nuclear power plant reactor coolant system vacuum pumping method according to any one of claim 2 to 7, it is characterized in that, described reactor coolant loop comprises voltage stabilizer and pressure vessel, and the valve on reactor coolant loop exhaust line refers to the isolation valve on voltage stabilizer top vent pipeline and the isolation valve on pressure vessel top vent pipeline.
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| CN110459332B (en) * | 2019-07-12 | 2023-03-21 | 岭澳核电有限公司 | Nuclear power station fire-fighting pipe network system and nuclear power station fire-fighting pipe network online optimization method |
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| CN101783187A (en) * | 2009-07-22 | 2010-07-21 | 中广核工程有限公司 | Exhaustion method for main system of reactor |
| CN101916595A (en) * | 2010-07-28 | 2010-12-15 | 中国广东核电集团有限公司 | Method for vacuumizing and exhausting reactor primary circuit of pressurized water reactor nuclear power station |
| CN203026165U (en) * | 2012-12-13 | 2013-06-26 | 中国核动力研究设计院 | Circuit accident exhaust system of pressurized water reactor nuclear power plant |
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| KR100383817B1 (en) * | 2000-12-22 | 2003-05-14 | 한국전력공사 | Depressurization Apparatus of Self-Pressurizer Using a Simple Pressure Cycle Loop and it's Method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783187A (en) * | 2009-07-22 | 2010-07-21 | 中广核工程有限公司 | Exhaustion method for main system of reactor |
| CN101916595A (en) * | 2010-07-28 | 2010-12-15 | 中国广东核电集团有限公司 | Method for vacuumizing and exhausting reactor primary circuit of pressurized water reactor nuclear power station |
| CN203026165U (en) * | 2012-12-13 | 2013-06-26 | 中国核动力研究设计院 | Circuit accident exhaust system of pressurized water reactor nuclear power plant |
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