CN102737744B - Nuclear power plant's instrument piping fire risk analysis method - Google Patents
Nuclear power plant's instrument piping fire risk analysis method Download PDFInfo
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- CN102737744B CN102737744B CN201210214024.8A CN201210214024A CN102737744B CN 102737744 B CN102737744 B CN 102737744B CN 201210214024 A CN201210214024 A CN 201210214024A CN 102737744 B CN102737744 B CN 102737744B
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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
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Abstract
The invention belongs to nuclear power plant design technology, be specifically related to nuclear power plant's instrument piping fire risk analysis method.The analyst coverage of the first selected sensor of the method, then determine that the instrument piping of selected sensor is subject to the thermal source of influence of fire, analyzed by thermal effect, the thermal effect that judgement fire causes is for the influence degree of instrument piping.The present invention, by the fire risk analysis to instrument piping, taking measurements for fire-protection to analyzing the weak link found in conclusion, ensureing the execution of security function, effectively can reduce the harm that fire causes npp safety function.
Description
Technical field
The invention belongs to nuclear power plant design technology, be specifically related to nuclear power plant's instrument piping fire risk analysis method.
Background technology
In recent years, ensure that the fireproofing technique of important component part achieves tremendous development as npp safety.In the design of part new power plant construction, for ensureing the execution of nuclear safety function, comprehensively and systematically solving and processing the equipment common mode failure that fire causes, having carried out relevant fire weak link analysis, having which includes the fire risk analysis to instrument piping.Instrument piping is that its common-mode point belongs to the category of mechanical common mode for the pipeline between connecting sensor and first valve, and relative to the pipeline of other Large Diameter Pipeline, fire can cause larger impact to instrument piping.Fire risk analysis and protection work are not carried out to instrument piping in the fire protection design of nuclear power plant in early days; but under fire condition; medium expanded by heating in gauge pipe; directly can impact meter measurements, cause nuclear-safety-related system error starting maybe can not provide real metrical information to operator.It is very complicated that gauge pipe lays path, restricts by environmental factor simultaneously, is therefore difficult in design adopt the method for entity isolation to carry out completely isolated measurements for fire-protection to its redundancy pipeline.In sum; in order to improve the security performance of nuclear power plant; need newly to carry out instrument piping fire risk analysis in the fire protection design of new nuclear power factory, and then take relevant safeguard measure, cause instrument measurement can not the problem of normal n-back test more comprehensively and systematically to process fire.
Summary of the invention
The information that the object of the invention is to prevent the instrument piping belonging to sensor from producing sensor measurement in case of fire departs from or failure phenomenon; a kind of nuclear power plant instrument piping fire risk analysis method is provided; pass through fire risk analysis; instrument piping is protected, to ensure that it performs nuclear safety correlation function smoothly.
Technical scheme of the present invention is as follows: a kind of nuclear power plant instrument piping fire risk analysis method, comprises the steps:
(1) selected biosensor analysis scope, comprises following a few class sensor:
A) security function necessary redundant sensor is performed when fire occurs,
B) the necessary sensor of malfunction protocol proper operation is guaranteed under fire condition,
C) instrument piping with a), b) two class sensors be connected, other sensor beyond this two classes sensor;
(2) determine that the instrument piping of selected sensor is subject to the thermal source of influence of fire;
(3) carry out thermal effect analysis, the thermal effect that judgement fire causes is for the influence degree of instrument piping.
Further, nuclear power plant as above instrument piping fire risk analysis method, in step (2), determine that the concrete grammar of thermal source is: that searches related sensor by instrument piping arrangenent diagram lays path, the fire load that analysis meter pipeline is important and fire duration, to judge whether instrument piping can be subject to the thermal current of fire generation or thermal-radiating impact.
Further, nuclear power plant as above instrument piping fire risk analysis method, in step (3), according to sensor design characteristic, if it is determined that the thermal effect that fire causes is very limited for the impact of instrument piping, so can not cause the inefficacy of sensor, then without the need to process, terminate this and analyze.
Further; nuclear power plant as above instrument piping fire risk analysis method, in step (3), has a strong impact on if confirm that thermal effect can cause measurement; and can be had an impact to nuclear safety function by functional analysis confirmation, then safeguard measure is taked to correlate meter pipeline.
Beneficial effect of the present invention is as follows: the present invention is by the fire risk analysis to instrument piping; measurements for fire-protection is taked to analyzing the weak link found in conclusion; ensure the execution of security function, effectively can reduce the harm that fire causes npp safety function.
Accompanying drawing explanation
Fig. 1 is analytical approach process flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
As shown in Figure 1, nuclear power plant of the present invention instrument piping fire risk analysis method, comprises following content:
(1) selected analyst coverage
Pay close attention to following a few class sensor:
A) when fire occurs, perform the necessary redundant sensor of security function, need to pay close attention to two class common-mode point below, selective analysis is carried out to the redundant sensor related separately in two class common-mode point:
the common-mode point confirmed in the analysis of fire weak link;
be damaged owing to measuring cable, Digitizing And Control Unit (DCS) may detect this sensor failure,
Sensors with auxiliary electrode belongs to the common-mode point of not confirmed in fire weak link is analyzed.
B) the necessary sensor of malfunction protocol proper operation is guaranteed under fire condition.
C) above-mentioned two class sensors are not belonged to, but the sensor that its instrument piping is connected with above-mentioned two class sensors.
(2) fire risk analysis is carried out according to correlation criterion
Instrument piping fire risk analysis follows common fire risk analysis criterion and relevant basic assumption:
the measurement cable not carrying out flameproof protection be usually subject to fire easier than sensor itself destroys;
compared with the instrument piping measuring cable and sensor proximity and equipment, be more prone to be subject to fire and destroy and lost efficacy;
even if this fire safety space belongs to diffusivity fire (PFG), fire duration is greater than 20 minutes, can ensure its integrality by the instrument piping of socket weld with capillary gauge pipe is the same.
(3) thermal source is determined
That searches related sensor by instrument piping arrangenent diagram lays path, the fire load that analysis meter pipeline is important and fire duration, to judge whether instrument piping can be subject to thermal current that fire produces or thermal-radiating impact.
For the known technology being calculated as this area of fire load and fire duration, there are some and distinguish in the analytical approach that the present invention affects for thermal current and prior art, concrete grammar is as follows:
A the important fire load around () analysis meter pipeline laying path, judges fire type (overall diffusivity fire or Local Fire) according to the situation that important fire load distributes;
Relative position between (b) analyte sensors and important burning things which may cause a fire disaster, the distance simultaneously between survey sensor and burning things which may cause a fire disaster;
C () space structure feature to important conflagration area makes analysis;
D () considers the factors such as fire duration, space length, design feature and judges the functions of the equipments failure risk that thermal current or heat radiation cause.
(4) thermal effect and functional analysis
According to sensor design characteristic, if it is determined that the thermal effect that fire causes is very limited for the impact of instrument piping, so can not cause the inefficacy of sensor, then without the need to process, terminate this and analyze.Otherwise, carry out next step and analyze.If confirm that thermal effect can cause measurement to have a strong impact on, and have an impact to nuclear safety function, then unacceptable from functional analysis angle, therefore measurements for fire-protection is taked to correlate meter pipeline.
Thermal effect analytical approach is as follows: the design feature and the piping arrangement situation that consider gauge pipe, determines whether fire can cause the thermal expansion of the liquid to be measured in gauge pipe and affected instrument scope; In conjunction with instrument measurement principle and by the degree of influence of fire, it is invalid to determine to measure the influence degree of sensor accuracy class and whether finally causing.If it is determined that thermal effect will cause instrument measurement to lose efficacy, then need to carry out functional analysis further.
Functional analysis approach is as follows: the logic that the metrical information of analyte sensors participates in; and the judgement of safe associated drive mechanism steering logic and execution under metrical information failure conditions; and determine the execution that finally whether can affect nuclear safety function; if sensor measurement "Fail-safe" function cannot ensure, then need to take safeguard measure to correlate meter pipeline.
Application example
Instrument piping fire risk analysis method is adopted to analyze main feedwater flow regulation system (ARE) analog sensor 3ARE010MN, this sensor is used for the measurement of RCP001GV water level (narrow range), guarantees the necessary sensor of malfunction protocol proper operation under belonging to the common-mode point and fire condition confirmed in the analysis of fire weak link;
By searching arrangenent diagram and the installation diagram of instrument associated conduit, the path of laying determining sensor 3ARE010MN instrument piping mainly concentrates in fire protection space 3ZFSR0180B and 3ZFSR0380A.
According to laying fire load important around path analysis instrument piping and fire duration, judge that the impact of thermal current on instrument piping that fire produces is limited, without the need to taking relevant safeguard measure to sensor and instrument piping.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if belong within the scope of the claims in the present invention and equivalent technology thereof to these amendments of the present invention and modification, then the present invention is also intended to comprise these change and modification.
Claims (1)
1. nuclear power plant's instrument piping fire risk analysis method, comprises the steps:
(1) selected biosensor analysis scope, comprises following a few class sensor:
A) security function necessary redundant sensor is performed when fire occurs,
B) the necessary sensor of malfunction protocol proper operation is guaranteed under fire condition,
C) instrument piping with a), b) two class sensors be connected, other sensor beyond this two classes sensor;
(2) determine that the instrument piping of selected sensor is subject to the thermal source of influence of fire, concrete grammar is: that searches related sensor by instrument piping arrangenent diagram lays path, the fire load that analysis meter pipeline is important and fire duration, to judge whether instrument piping can be subject to the thermal current of fire generation or thermal-radiating impact; Wherein, the analytical approach for thermal current or heat radiation impact is as follows:
A the important fire load around () analysis meter pipeline laying path, judges fire type according to the situation that important fire load distributes;
Relative position between (b) analyte sensors and important burning things which may cause a fire disaster, the distance simultaneously between survey sensor and burning things which may cause a fire disaster;
C () space structure feature to important conflagration area makes analysis;
D () considers fire duration, space length, design feature factor judge the functions of the equipments failure risk that thermal current or heat radiation cause;
(3) thermal effect analysis is carried out, the thermal effect that judgement fire causes is for the influence degree of instrument piping, according to sensor design characteristic, if it is determined that the thermal effect that fire causes is very limited for the impact of instrument piping, so can not cause the inefficacy of sensor, then without the need to process, terminate this and analyze; If confirm that thermal effect can cause measurement to have a strong impact on, and can be had an impact to nuclear safety function by functional analysis confirmation, then safeguard measure is taked to correlate meter pipeline.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103678795B (en) * | 2013-12-03 | 2017-05-31 | 中国核电工程有限公司 | A kind of method of nuclear power station flameproof protection analysis |
| CN109935376B (en) * | 2017-12-18 | 2022-06-28 | 中国核动力研究设计院 | Quantification method for instrument damage caused by beta rays in severe accident of nuclear power plant |
| CN109934027B (en) * | 2019-02-19 | 2023-02-28 | 中广核工程有限公司 | Fire consequence simulation method and system for nuclear power plant |
| CN116185095B (en) * | 2023-04-27 | 2023-07-28 | 科大智能物联技术股份有限公司 | Spray cooling control system based on infrared imaging |
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