CN103413578A - Two-unit alternative-discharging method of containment vessel filtering discharging system - Google Patents
Two-unit alternative-discharging method of containment vessel filtering discharging system Download PDFInfo
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- CN103413578A CN103413578A CN201310293436XA CN201310293436A CN103413578A CN 103413578 A CN103413578 A CN 103413578A CN 201310293436X A CN201310293436X A CN 201310293436XA CN 201310293436 A CN201310293436 A CN 201310293436A CN 103413578 A CN103413578 A CN 103413578A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to a reactor designing technology, and particularly relates to a two-unit alternative-discharging method of a containment vessel filtering discharging system. The two-unit alternative-discharging method comprises the steps of after an accident occurs, firstly, switching on a containment vessel isolating valve of a first unit so as to carry out filtering discharging on the first unit; when the pressure of a second unit is high, closing a discharging pipeline of the first unit, switching on an isolating valve of the second unit so as to carry out filtering discharging on the second unit; and when the pressure of the first unit raises, switching off the isolating valve of the second unit, switching on the isolating valve of the first unit so as to carry out filtering discharging on the first unit, and repeatedly executing the steps. By determining a time window in which each unit discharges in alternative operation, the pressure of a containment vessel of the two units is not enabled to exceed a safety limit value under the condition of reducing the switching frequency as soon as possible. According to the two-unit alternative-discharging method, hardware investment of a nuclear station does not need to be increased, the capacity of coping two-unit serious accidents by the nuclear station with two units is improved, and the probability of a large quantity of radiological release is reduced.
Description
Technical field
The invention belongs to the reactor designing technique, be specifically related to a kind of containment filtration exhaust system two-shipper group and replace discharge method.
Background technology
The containment filtration exhaust system is one of measure of nuclear power station reply major accident.When the major accident of pressure vessel burn through occurs, due to the melting reactor core, react the non-condensable gas produced constantly increases with concrete floor, or the containment spray system inefficacy, and the pressure in containment can raise gradually, may destroy the integrality of containment, cause a large amount of radiomaterials to discharge.The containment filtration exhaust system can make pressure in containment be no more than its carrying limit value by the active release and prevent that containment lost efficacy.By the filtration unit be arranged on the release pipeline, emission gases is filtered simultaneously, limit as far as possible the release of radiomaterial to environment.
Current the second stage of nuclear power station of the operation nuclear power station of China such as Qinshan second phase and ridge Australia, and large quantities ofly all adopted containment filtration exhaust system (EUF) building nuclear power station such as Fuqing, Fan family mountain and Hainan etc.These nuclear power stations are two heaps and arrange, the containment filtration exhaust system is that the two-shipper group shares, major equipment comprises isolation valve 2, two-stage filter (venturi water scrubber 3 and metal fiber filter 4) and the rupture disk 5 that is arranged on containment 1 outside, finally with the chimney 6 of nuclear power station, be connected, as shown in Figure 1.When a unit generation major accident, the startup of containment filtration exhaust system only needs the containment isolating valve on the corresponding containment associated line of manual unlocking, and containment gas enters system and carries out passive filtration.Containment isolating valve is the teletransmission Hand-operated butterfly valve, and the teletransmission manual operation is carried out after barrier shield.When containment filtration exhaust system internal pressure surpassed the rupture disk setting value of pressure of system downstream, rupture disk was opened, and the containment atmosphere after two-stage filtration outwards discharges by chimney.
Past is only considered the situation of a unit generation major accident in design, so the containment filtration exhaust system is that the two-shipper group shares, and its capacity and ability are all to design by the alleviation requirement that meets a unit generation major accident.But after the Fukushima nuclear accident, nuclear facility authorities and nuclear industry circle start to pay attention to the situation that major accident occurs multicomputer simultaneously, this just requires to possess the ability of two-shipper group accident being carried out to filtering emission.Operation and increase a set of containment filtration exhaust system and realize that the alone difficulty of single heap is very large building nuclear power station, and use a set of containment filtration exhaust system shared to carry out simultaneously filtering emission (namely opening simultaneously two isolation valves on the containment associated line) to the two-shipper group, will bring filter's flow to exceed the consequences such as design discharge, the connection of two containment atmosphere.Therefore need under the prerequisite that is no more than system capacity and the expansion of Accident prevention coverage, only use existing a set of containment filtration exhaust system to realize the effective filtering emission to two-shipper group containment, guarantee simultaneously the integrality of two containments.
Summary of the invention
The object of the invention is to for problems of the prior art, provide a kind of containment filtration exhaust system two-shipper group to replace discharge method, realize the effective filtering emission to two-shipper group containment, guarantee simultaneously the integrality of two containments.
Technical scheme of the present invention is as follows: a kind of containment filtration exhaust system two-shipper group replaces discharge method, after accident occurs, first opens the containment isolating valve of the first unit, and the first unit is carried out to filtering emission; After the second unit pressure is higher, close the bleeder line of the first unit, open the second unit isolation valve, the second unit is carried out to filtering emission; After the pressure rise of the first unit, again close the second unit isolation valve, open the first unit isolation valve, the first unit is carried out to filtering emission, and so forth circulation; By determining the time window that replaces every unit discharge in emissions operation, all be no more than safety limit in the situation that reduce as far as possible the containment pressure of switching times assurance two-shipper group.
Further, containment filtration exhaust system two-shipper group as above replaces discharge method, wherein, determines that the method for the time window that every unit discharges is as follows:
The first unit starts filtering emission when containment pressure reaches the 0.5MPa absolute pressure first, the second unit starts filtering emission when containment pressure reaches the 0.6MPa absolute pressure first, and both time intervals are T hour;
The measuring and calculating containment filtration exhaust system required time of blocked operation is x hour, the time window t=T-x hour of every unit discharge;
After this t of per elapsed time, namely start blocked operation.
Further, containment filtration exhaust system two-shipper group as above replaces discharge method, wherein, for different accident conditionses, utilize thermal-hydraulic or major accident Integrative Program to determine the occurrence of drain time window t, for two-shipper group station blackout accident, t=12.2 hour; For reactor coolant loop large break accident, t=9.5 hour.
Further, containment filtration exhaust system two-shipper group as above replaces discharge method, wherein, the containment filtration exhaust system put into operation and blocked operation in, the site operation personnel need to take Radiation Exposure; In discharge process, need to adopt portable chemical dosing combination unit to carry out repeatedly moisturizing to the venturi water scrubber.
Beneficial effect of the present invention is as follows:
(1) the present invention simply determines when according to the size of containment internal pressure the filtering emission that carries out unit, but by rationally determining the time window of every unit discharge, determine the opportunity of blocked operation, all be no more than safety limit in the situation that reduce as far as possible the containment pressure of switching times assurance two-shipper group.
(2) the present invention does not need to increase the hardware investment of nuclear power station, only by the change of working specification, uses a set of containment filtration exhaust system just can meet the filtering emission needs of two-shipper group.
(3) the present invention has improved the adaptibility to response of two-shipper group layout nuclear power station for two-shipper group major accident, reduces a large amount of radioactivity release probability.
The accompanying drawing explanation
Fig. 1 is containment filtration exhaust system flow process and equipment schematic diagram;
Fig. 2 is that containment filtration exhaust system two-shipper group replaces the discharging modes schematic diagram;
Fig. 3 is that station blackout accident occurs the two-shipper group simultaneously, adopts the alternately discharge of containment filtration exhaust system, and the pressure of two-shipper group containment changes schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
The present invention adopts the two-shipper group is replaced to the problem that the mode of discharging solves two-shipper group accident filtering emission.In order to guarantee to replace practicality and the universality of discharge method, to the present invention proposes, choose the alternately method of drain time window, determine the conservative value of all accident conditions of energy envelope, and clearly replace the necessary supplementary measures of emissions operation enforcement.
In order to realize that a set of containment filtration exhaust system carries out the effect of filtering emission to the two-shipper group, can select following discharging modes: first open the wherein containment isolating valve of a unit (supposing No. 1 unit), No. 1 unit is carried out to filtering emission; After No. 2 unit pressure are higher, close the bleeder line of No. 1 unit, open the unit isolation valve No. 2, No. 2 units are carried out to filtering emission; After the pressure rise of No. 1 unit, again close the unit isolation valve No. 2, open the unit isolation valve No. 1, No. 1 unit is carried out to filtering emission, and so forth circulation.
Alternately the key of emissions operation is rationally to determine the time window of every unit discharge, all is no more than safety limit in the situation that reduce as far as possible the containment pressure of switching times assurance two-shipper group.For China's operation at present with in the two generation Fortschrittlicher Druckwasser Reaktor technology (M310) of building, the present invention proposes to choose alternately drain time t(Fig. 2 according to following steps):
-No. 1 unit reaches 0.5MPa(a first at containment pressure) time start filtering emission, No. 2 unit reaches 0.6MPa(a first at containment pressure) time start filtering emission, both time intervals are T;
-because containment filtration exhaust system blocked operation (isolation valve of No. 1 unit of manual-lock is opened No. 2 the unit isolation valve) the required time is about 0.5h, the time window t=T-0.5h of every unit discharge;
-t of per elapsed time after this, namely start blocked operation.
For different accident conditionses, can utilize thermal-hydraulic or major accident Integrative Program (as MELCOR or MAAP) to determine the occurrence of drain time window t, and verify its validity (pressure that namely guarantees any containment of any time all is no more than the containment failure pressure).Such as for two-shipper group station blackout accident, can determine t=12.2h, alternately the two-shipper group containment pressure under emission behaviour is as shown in Figure 3.For a plurality of typical accident conditions, the t value that the present invention has utilized the computer program proof to choose according to above step is effectively, therefore can be used as the universal method of window access time.
For the worst operating mode of containment pressure-bearing, be reactor coolant loop large break accident, and have and with the reactor core moisturizing of decay heat coupling, take away heat and cause containment to boost.Therefore the alternately drain time that occurs simultaneously to obtain under these type of accident conditions in the two-shipper group is the most conservative value, can envelope other accident conditions.Through calculating, the conservative value of drain time window is 9.5h.In the situation that accident conditions are lacked to enough information, adopt the integrality of the assurance two-shipper group containment that this value can maximum possible.
The enforcement of this programme also needs corresponding supplementary measures.Putting into operation and switching of containment filtration exhaust system needs manually opened and closed safe shell isolation valve, multi-pass operations may make the site operation personnel be subject to larger exposure dose, need to take certain radiation protection scheme for this reason, as wear protective gear, control operation time, wheel flow operation etc.In addition two containments are carried out to filtering emission, the emission gases total amount increases, and the fission product amount of being detained in filtrator increases, and decay heat increases, and causes in the venturi water scrubber liquid evaporation very fast.In discharge process, may need to adopt portable chemical dosing combination unit to carry out repeatedly moisturizing to the venturi water scrubber.Much smaller than the required whole time of containment filtration discharge process, repeatedly the moisturizing operation is limited on the impact of filtering emission effect due to the moisturizing time.No matter be the blocked operation of containment filtration exhaust system, still utilize the moisturizing operation of portable chemical dosing combination unit to the venturi water scrubber, all should include emergency preplan in the factory in multicomputer major accident situation in, in the outfit of operating personnel and radiation protection goods and materials, carry out adequate preparation, and regularly carry out training and exercises.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and within modification belongs to the scope of the claims in the present invention and equivalent technology thereof, the present invention also is intended to comprise these changes and modification interior.
Claims (4)
1. a containment filtration exhaust system two-shipper group replaces discharge method, it is characterized in that: after accident occurs, first open the containment isolating valve of the first unit, the first unit is carried out to filtering emission; After the second unit pressure is higher, close the bleeder line of the first unit, open the second unit isolation valve, the second unit is carried out to filtering emission; After the pressure rise of the first unit, again close the second unit isolation valve, open the first unit isolation valve, the first unit is carried out to filtering emission, and so forth circulation; By determining the time window that replaces every unit discharge in emissions operation, all be no more than safety limit in the situation that reduce as far as possible the containment pressure of switching times assurance two-shipper group.
2. containment filtration exhaust system two-shipper group as claimed in claim 1 replaces discharge method, it is characterized in that: the method for determining the time window that every unit discharges is as follows:
The first unit starts filtering emission when containment pressure reaches the 0.5MPa absolute pressure first, the second unit starts filtering emission when containment pressure reaches the 0.6MPa absolute pressure first, and both time intervals are T hour;
The measuring and calculating containment filtration exhaust system required time of blocked operation is x hour, the time window t=T-x hour of every unit discharge;
After this t of per elapsed time, namely start blocked operation.
3. containment filtration exhaust system two-shipper group as claimed in claim 2 replaces discharge method, it is characterized in that: for different accident conditionses, utilize thermal-hydraulic or major accident Integrative Program to determine the occurrence of drain time window t, for two-shipper group station blackout accident, t=12.2 hour; For reactor coolant loop large break accident, t=9.5 hour.
4. as claim 1 or 2 or 3 described containment filtration exhaust system two-shipper groups, replace discharge method, it is characterized in that: the containment filtration exhaust system put into operation and blocked operation in, the site operation personnel need to take Radiation Exposure; In discharge process, need to adopt portable chemical dosing combination unit to carry out repeatedly moisturizing to the venturi water scrubber.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105551547A (en) * | 2015-12-15 | 2016-05-04 | 中广核工程有限公司 | Medicine adding device of closed circulation system of nuclear power station |
| CN110189837A (en) * | 2019-05-10 | 2019-08-30 | 中广核研究院有限公司 | A kind of the pressure adjusting and filtering emission system of containment |
| CN110354645A (en) * | 2019-06-21 | 2019-10-22 | 中广核工程有限公司 | A kind of passive online liquid supply device of containment filtration exhaust system and method |
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| US5706320A (en) * | 1996-01-16 | 1998-01-06 | General Electric Company | Containment pressure suppression system for liquid metal cooled reactors |
| US6185269B1 (en) * | 1998-09-08 | 2001-02-06 | General Electric Company | Liquid metal reactor power block |
| CN102708932A (en) * | 2012-06-12 | 2012-10-03 | 中广核工程有限公司 | Containment filtering and discharging system of twin-reactor nuclear power plant |
| CN102723114A (en) * | 2012-05-30 | 2012-10-10 | 中国核电工程有限公司 | Containment filtering and discharging system |
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Patent Citations (4)
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| US5706320A (en) * | 1996-01-16 | 1998-01-06 | General Electric Company | Containment pressure suppression system for liquid metal cooled reactors |
| US6185269B1 (en) * | 1998-09-08 | 2001-02-06 | General Electric Company | Liquid metal reactor power block |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105551547A (en) * | 2015-12-15 | 2016-05-04 | 中广核工程有限公司 | Medicine adding device of closed circulation system of nuclear power station |
| CN110189837A (en) * | 2019-05-10 | 2019-08-30 | 中广核研究院有限公司 | A kind of the pressure adjusting and filtering emission system of containment |
| CN110354645A (en) * | 2019-06-21 | 2019-10-22 | 中广核工程有限公司 | A kind of passive online liquid supply device of containment filtration exhaust system and method |
| CN110354645B (en) * | 2019-06-21 | 2022-06-07 | 中广核工程有限公司 | Passive online liquid supplementing device and method for containment filtering and discharging system |
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