CN103400607A - Vacuumizing method for reactor coolant system of nuclear power plant - Google Patents
Vacuumizing method for reactor coolant system of nuclear power plant Download PDFInfo
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- CN103400607A CN103400607A CN2013103295452A CN201310329545A CN103400607A CN 103400607 A CN103400607 A CN 103400607A CN 2013103295452 A CN2013103295452 A CN 2013103295452A CN 201310329545 A CN201310329545 A CN 201310329545A CN 103400607 A CN103400607 A CN 103400607A
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- reactor coolant
- relief tank
- pressurizer relief
- valve
- 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 vacuumizing method for a reactor coolant system of a nuclear power plant, which comprises the following steps: 1, during the period of unit maintenance, emptying the inside of a pressurizer relief tank firstly, and pumping the pressurizer relief tank to be in a vacuum state by using a vacuum pump; 2, at the beginning of unit vacuumizing and exhausting, switching on a valve on a connecting pipe line between the reactor coolant system and the pressurizer relief tank, and meanwhile, carrying out air extraction on the reactor coolant system by using the vacuum pump. According to the vacuumizing method for the reactor coolant system of the nuclear power plant, disclosed by the invention, through emptying the pressurizer relief tank in advance, so that when the reactor coolant system is subjected to the vacuumizing by using the vacuum pump, the pressurizer relief tank can contain part of gas so as to shorten the vacuumizing time of the vacuum pump, thereby achieving the purpose of shortening the air extraction time and improving the economical efficiency of the nuclear power plant under the condition of not changing the original system configuration.
Description
Technical field
The invention belongs to the nuclear power technology field, 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 the nuclear power station unit starting, need to be to the exhaust of reactor coolant loop water-filling, the non-condensable gas in vertical steam generator inverted U pipe especially.At present, adopting the nuclear power plant of vertical steam generator is all that the static exhaust of employing adds dynamically (associating) exhaust or the mode of vacuumizing and exhausting is completed the exhaust work in a loop.By contrast, static exhaust time of adding dynamically (associating) exhaust will obviously 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 the operation of trunk line semicanal water level, utilize vacuum pump to bleed from the exhaust line at top cover of reactor pressure vessel and voltage stabilizer top, when a circuit pressure reaches 0.2bar abs left and right, start to prepare to the reactor coolant loop water-filling, after this carry out when the water-filling of reactor coolant loop and air pump.But, in said process, utilize vacuum pump first reactor coolant loop to be evacuated to 0.2bar abs and still can expend the more time.
Because time of vacuumizing and exhausting is limited by the volume of reactor coolant loop headroom and the volume of vacuum pump, for the nuclear power plant that adopts vacuumizing and exhausting, the headroom of maintenance period reactor coolant loop can not reduce, and for a change capacity of vacuum pump replacing vacuum pump is also a kind of uneconomic way.
In view of this, necessaryly provide a kind of and can in the situation that do not change original system configuration, effectively reduce the nuclear power plant reactor coolant system vacuum pumping method of bleeding the time and improving the nuclear power station business efficiency.
Summary of the invention
The object of the invention is to: providing a kind of can in the situation that do not change original system configuration, effectively reduce the nuclear power plant reactor coolant system vacuum pumping method of bleeding the time and improving the nuclear power station business efficiency.
In order to realize the foregoing invention purpose, 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 with emptying in pressurizer relief tank, utilize vacuum pump with the pressurizer relief tank state that is evacuated; And
Step (two): when the unit vacuumizing and exhausting starts,, with the valve open on associated line between reactor coolant loop and pressurizer relief tank, meanwhile, utilize vacuum pump to bleed to reactor coolant loop.
As a kind of improvement of nuclear power plant reactor coolant system vacuum pumping method of the present invention, described step () is subdivided into again following steps:
(1) in the unit maintenance period, after the pressurizer relief tank maintenance is complete, open the drain valve of pressurizer relief tank, after pressurizer relief tank is emptying, the drain valve of pressurizer relief tank is closed;
(2) with the valve closing on the reactor coolant loop exhaust line, pressurizer relief tank is led to valve open on the air guide pipeline of vacuum pump, opening vacuum pump bleeds to pressurizer relief tank, after pressurizer relief tank becomes vacuum state, vacuum pump is stopped transport, close simultaneously pressurizer relief tank and lead to valve on the air guide pipeline of vacuum pump.
As a kind of improvement of nuclear power plant reactor coolant system vacuum pumping method of the present invention, described step (two) is subdivided into again following steps:
(3) after unit is carried out the preparation of vacuumizing and exhausting, the valve that the valve on the reactor coolant loop exhaust line, pressurizer relief tank lead on the air guide pipeline of reactor coolant loop is all opened, and opened vacuum pump;
(4) when the headroom pressure in reactor coolant loop approaches or be slightly larger than pressure in pressurizer relief tank, pressurizer relief tank is led to valve closing on the air guide pipeline of reactor coolant loop;
(5) allow the valve on the reactor coolant loop exhaust line be held open state, the vacuum pump operation, continue reactor coolant loop is bled, until the pressure decreased of reactor coolant loop is to setting.
A kind of improvement as nuclear power plant reactor coolant system vacuum pumping method of the present invention, air guide pipeline and its air guide pipeline that leads to reactor coolant loop that described pressurizer relief tank leads to vacuum pump are same pipeline, and the valve on described air guide pipeline is isolation valve.
As a kind of improvement of nuclear power plant reactor coolant system vacuum pumping method of the present invention, described step () is subdivided into again following steps:
(1) in the unit maintenance period, after the pressurizer relief tank maintenance is complete, open the drain valve of pressurizer relief tank, after pressurizer relief tank is emptying, the drain valve of pressurizer relief tank is closed;
(2) with the valve closing on the reactor coolant loop exhaust line, with the valve open on the pressurizer relief tank exhaust line, opening vacuum pump bleeds to pressurizer relief tank, after pressurizer relief tank becomes vacuum state, vacuum pump is stopped transport, close simultaneously the valve on the pressurizer relief tank exhaust line.
As a kind of improvement of nuclear power plant reactor coolant system vacuum pumping method of the present invention, described step (two) is subdivided into again following steps:
(3) after unit is carried out the preparation of vacuumizing and exhausting, the reverse checkvalve that the valve on the reactor coolant loop exhaust line, pressurizer relief tank is connected on the admission line of reactor coolant loop is all opened, and opens vacuum pump;
(4) when the headroom pressure in reactor coolant loop approaches or be slightly less than pressure in pressurizer relief tank, the reverse checkvalve that pressurizer relief tank is connected on the admission line of reactor coolant loop is closed automatically;
(5) allow the valve on the reactor coolant loop exhaust line be held open state, the vacuum pump operation, continue reactor coolant loop is bled, until the pressure decreased of reactor coolant loop is to setting.
As a kind of improvement of nuclear power plant reactor coolant system vacuum pumping method of the present invention, 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.
A kind of improvement as nuclear power plant reactor coolant system vacuum pumping method of the present invention, described reactor coolant loop comprises voltage stabilizer and pressure vessel, and the valve on the reactor coolant loop exhaust line refers to isolation valve on the exhaust line of voltage stabilizer top and the isolation valve on the exhaust line of pressure vessel top.
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, make while utilizing vacuum pump to vacuumize reactor coolant loop, pressurizer relief tank can holding portion gas and is shortened pumpdown time of vacuum pump, thereby realized in the situation that do not change original system configuration, reduced the time of bleeding, improve the purpose of nuclear power station economy.
Description of drawings
Below in conjunction with the drawings and specific embodiments, nuclear power plant reactor coolant system vacuum pumping method of the present invention is elaborated, wherein:
Fig. 1 is the process principle figure of nuclear power plant reactor coolant system vacuum pumping method of the present invention the first embodiment.
Fig. 2 is the process principle figure of nuclear power plant reactor coolant system vacuum pumping method of the present invention the second embodiment.
Embodiment
, in order to make goal of the invention of the present invention, technical scheme and useful technique effect thereof more clear, below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.Should be understood that, the embodiment of describing in this instructions is only in order to explain the present invention, not in order 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 with emptying in pressurizer relief tank, utilize vacuum pump with the pressurizer relief tank state that is evacuated; And
Step (two): when the unit vacuumizing and exhausting starts,, with the valve open on associated line between reactor coolant loop and pressurizer relief tank, meanwhile, utilize vacuum pump to bleed to reactor coolant loop.
See also shown in Figure 1ly, the principle of work of nuclear power plant reactor coolant system vacuum pumping method of the present invention the first embodiment is as follows:
Step (one): in the unit maintenance period, first that pressurizer relief tank 10 is interior emptying, utilize vacuum pump 20 with pressurizer relief tank 10 state that is evacuated, particularly, step () is subdivided into again following steps:
(1) in the unit maintenance period, after pressurizer relief tank 10 maintenance are complete, open the drain valve 12 of pressurizer relief tank 10, after pressurizer relief tank 10 is emptying, the drain valve of pressurizer relief tank 10 12 is closed;
(2) with the isolation valve 34 on voltage stabilizer 30 top exhaust lines 32,36 and pressure vessel 40 top exhaust lines 42 on isolation valve 44,46 close; Isolation valve 14 on the air guide pipeline 13 of pressurizer relief tank 10 is opened, opened 20 pairs of pressurizer relief tanks 10 of vacuum pump and bleed, after pressurizer relief tank 10 becomes vacuum state, vacuum pump 20 is stopped transport, close simultaneously isolation valve 14;
Step (two): when the unit vacuumizing and exhausting starts,, with the valve open on associated line between reactor coolant loop and pressurizer relief tank 10, meanwhile, utilize 20 pairs of reactor coolant loops of vacuum pump to bleed.
Particularly, step (two) is subdivided into again following steps:
(3) after unit is carried out the preparation of vacuumizing and exhausting, the isolation valve 34,36,44,46,14 between reactor coolant loop and pressurizer relief tank 10 is all opened, and opened vacuum pump 20;
(4) when the headroom pressure in reactor coolant loop approaches or be slightly larger than 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 operations, continue reactor coolant loop is bled, until the pressure decreased of reactor coolant loop is to setting.
See also shown in Figure 2ly, the principle of work of nuclear power plant reactor coolant system vacuum pumping method of the present invention the second embodiment is as follows:
Step (one):, in the unit maintenance period,, first with emptying in pressurizer relief tank 10a, utilize vacuum pump 20a with the pressurizer relief tank 10a state that is evacuated.
Particularly, step () is subdivided into again following steps;
(1) in the unit maintenance period, after pressurizer relief tank 10a maintenance is complete, 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 valve 34a, 36a on the exhaust line 32a of voltage stabilizer 30a top and two isolation valve 44a, 46a on the exhaust line 42a of pressure vessel 40a top are closed; The isolation valve 16a that pressurizer relief tank 10a is connected on vacuum pump 20a dedicated vent pipes line 15a opens; Open vacuum pump 20a pressurizer relief tank 10a is bled, after pressurizer relief tank 10a becomes vacuum state, vacuum pump 20a is stopped transport, close simultaneously isolation valve 16a;
Step (two): when the unit vacuumizing and exhausting starts,, with the valve open on associated line between reactor coolant loop and pressurizer relief tank 10a, meanwhile, utilize vacuum pump 20a to bleed to reactor coolant loop.
Particularly, step (two) is subdivided into again following steps:
(3) after unit is carried out the preparation of vacuumizing and exhausting, the reverse checkvalve 14a that isolation valve 34a, 36a on the reactor coolant loop exhaust line, 44a, 46a and pressurizer relief tank 10a is connected on the admission line 13a of reactor coolant loop all opens, only close pressurizer relief tank 10a and be connected to isolation valve 16a on vacuum pump 20a dedicated vent pipes line 15a, and open vacuum pump 20a;
(4) when the headroom pressure in reactor coolant loop approaches or be slightly less than pressure in pressurizer relief tank 10a, the reverse checkvalve 14a that pressurizer relief tank 10a is connected on the admission line 13a of reactor coolant loop closes automatically;
(5) allow isolation valve 34a, 36a, 44a, 46a be held open state, vacuum pump 20a operation, continue reactor coolant loop is bled, until the pressure decreased of reactor coolant loop is to setting.
By above description as can be known, the present invention is when carrying out step (two), due to the pressure of reactor coolant loop 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, thereby the pressure of reactor coolant loop is reduced gradually, and the pressure of pressurizer relief tank 10,10a raises gradually.Meanwhile, recycling vacuum pump 20,20a bleed to reactor coolant loop, can effectively reduce the vacuumizing and exhausting required time.
When the pressure of reactor coolant loop during near the pressure in pressurizer relief tank 10,10a, pressurizer relief tank 10,10a can not help exhaust, at this moment, can will isolate between pressurizer relief tank 10,10a and reactor coolant loop by isolation valve 14 or reverse checkvalve 14a, isolation valve 14 or reverse checkvalve 14a are also with the pipeline isolation of bleeding between vacuum pump 20,20a and pressurizer relief tank 10,10a simultaneously.Vacuum pump 20,20a can continue reactor coolant loop is bled, until the pressure decreased of reactor coolant loop is 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 while utilizing vacuum pump 20,20a to vacuumize reactor coolant loop, pressurizer relief tank 10,10a can holding portion gases and are shortened pumpdown time of vacuum pump 20,20a, thereby realized reducing the time of bleeding, improving the nuclear power station economy in the situation that do not change original system configuration.
According to above-mentioned principle, the present invention can also carry out suitable change and modification to above-mentioned embodiment.Therefore, the present invention is not limited to embodiment disclosed and described above, to modifications and changes more of the present invention, also should fall in the protection domain of claim of the present invention.In addition, although used 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 with emptying in pressurizer relief tank, utilize vacuum pump with the pressurizer relief tank state that is evacuated; And
Step (two): when the unit vacuumizing and exhausting starts,, with the valve open on associated line between reactor coolant loop and pressurizer relief tank, meanwhile, utilize vacuum pump 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 again following steps:
(1) in the unit maintenance period, after the pressurizer relief tank maintenance is complete, open the drain valve of pressurizer relief tank, after pressurizer relief tank is emptying, the drain valve of pressurizer relief tank is closed;
(2) with the valve closing on the reactor coolant loop exhaust line, pressurizer relief tank is led to valve open on the air guide pipeline of vacuum pump, opening vacuum pump bleeds to pressurizer relief tank, after pressurizer relief tank becomes vacuum state, vacuum pump is stopped transport, close simultaneously pressurizer relief tank and lead to valve on the air guide pipeline of vacuum pump.
3. nuclear power plant reactor coolant system vacuum pumping method according to claim 2, it is characterized in that: described step (two) is subdivided into again following steps:
(3) after unit is carried out the preparation of vacuumizing and exhausting, the valve that the valve on the reactor coolant loop exhaust line, pressurizer relief tank lead on the air guide pipeline of reactor coolant loop is all opened, and opened vacuum pump;
(4) when the headroom pressure in reactor coolant loop approaches or be slightly larger than pressure in pressurizer relief tank, pressurizer relief tank is led to valve closing on the air guide pipeline of reactor coolant loop;
(5) allow the valve on the reactor coolant loop exhaust line be held open state, the vacuum pump operation, continue reactor coolant loop is bled, until the pressure decreased of reactor coolant loop is to setting.
4. nuclear power plant reactor coolant system vacuum pumping method according to claim 3, it is characterized in that, air guide pipeline and its air guide pipeline that leads to reactor coolant loop that described pressurizer relief tank leads to vacuum pump are same pipeline, 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 again following steps:
(1) in the unit maintenance period, after the pressurizer relief tank maintenance is complete, open the drain valve of pressurizer relief tank, after pressurizer relief tank is emptying, the drain valve of pressurizer relief tank is closed;
(2) with the valve closing on the reactor coolant loop exhaust line, with the valve open on the pressurizer relief tank exhaust line, opening vacuum pump bleeds to pressurizer relief tank, after pressurizer relief tank becomes vacuum state, vacuum pump is stopped transport, close simultaneously the valve on the pressurizer relief tank exhaust line.
6. nuclear power plant reactor coolant system vacuum pumping method according to claim 5, is characterized in that, described step (two) is subdivided into again following steps:
(3) after unit is carried out the preparation of vacuumizing and exhausting, the reverse checkvalve that the valve on the reactor coolant loop exhaust line, pressurizer relief tank is connected on the admission line of reactor coolant loop is all opened, and opens vacuum pump;
(4) when the headroom pressure in reactor coolant loop approaches or be slightly less than pressure in pressurizer relief tank, the reverse checkvalve that pressurizer relief tank is connected on the admission line of reactor coolant loop is closed automatically;
(5) allow the valve on the reactor coolant loop exhaust line be held open state, the vacuum pump operation, continue reactor coolant loop is bled, until the pressure decreased of reactor coolant loop is to setting.
7. nuclear power plant reactor coolant system vacuum pumping method described according to right 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 described nuclear power plant reactor coolant system of any one vacuum pumping method according to claim 2 to 7, it is characterized in that, described reactor coolant loop comprises voltage stabilizer and pressure vessel, and the valve on the reactor coolant loop exhaust line refers to isolation valve on the exhaust line of voltage stabilizer top and the isolation valve on the exhaust line of pressure vessel top.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110459332A (en) * | 2019-07-12 | 2019-11-15 | 岭澳核电有限公司 | Nuclear power station fire_fighting pipe network system and nuclear power station fire_fighting pipe network method for on-line optimization |
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| KR20020050925A (en) * | 2000-12-22 | 2002-06-28 | 장인순 | Depressurization Apparatus of Self-Pressurizer Using a Simple Pressure Cycle Loop and it's Method |
| 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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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020050925A (en) * | 2000-12-22 | 2002-06-28 | 장인순 | Depressurization Apparatus of Self-Pressurizer Using a Simple Pressure Cycle Loop and it's Method |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110459332A (en) * | 2019-07-12 | 2019-11-15 | 岭澳核电有限公司 | Nuclear power station fire_fighting pipe network system and nuclear power station fire_fighting pipe network method for on-line optimization |
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