Method for analyzing weak link in fire of nuclear power plant

A treatment method and weak link technology, applied in the field of fire weak link analysis, can solve problems such as high price, high construction requirements, increase power plant operation and maintenance costs, and achieve the effect of reducing quantity and saving engineering cost

Active Publication Date: 2014-08-27
CHINA NUCLEAR POWER ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of materials for fireproof cladding of nuclear power plants and high construction requirements, the "full cladding" strategy has resulted in a substantial increase in one-time project investment, and at the same time increased the operation and maintenance costs of the power plant

Method used

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  • Method for analyzing weak link in fire of nuclear power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] ①In the nuclear fuel plant (KX plant), determine a column A safety fire protection space 3ZFSK0081A to be analyzed.

[0054] ②According to criteria a) and b), the following potential common mode points are found:

[0055] The limit switches of the two redundant column valves EAS013VB (Column A) and EAS014VB (Column B) are located in this safe fire protection space. According to the criteria of c) and d), there is no potential common mode point in this safe fire protection space.

[0056] ③Functional analysis:

[0057] These two valves are the isolation valves of the pit suction line of the containment spray pump (EAS001PO / 002PO). EAS013VB / 014VB is closed under normal operating conditions of the unit. In order to ensure the containment spray function, the valve is opened during the cyclic spray phase of the containment spray system. When receiving the "EAS013VB (EAS014VB) open" signal, at the same time as "EAS013VB (EAS014VB) is fully open", the containment spray pump refuelin...

Embodiment 2

[0064] ①In the nuclear fuel plant (KX plant), determine a 3ZFSK0280A column A to be analyzed.

[0065] ②According to criteria a) and b), the following potential common mode points are found:

[0066] That is to say, it was found that most of the A and B columns of the atmospheric monitoring subsystem (DVK) in the containment are located in the safe fire protection space. According to the criteria of c) and d), there is no potential common mode point in this safe fire protection space.

[0067] ③Functional analysis:

[0068] In the DVK system, only the small flow exhaust sub-system is a safety-related system. This system is used to reduce radioactive pollution in the bottom air after LOCA or nuclear fuel loading and unloading accidents. Therefore, from the perspective of functional analysis, the common mode point is confirmed.

[0069] ④ Fire risk analysis

[0070] This safe and fireproof space is not PFG. The room where the relevant equipment of the small flow exhaust sub-system is l...

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Abstract

The invention belongs to a method for processing a weak link in a fire, and in particular relates to a method for processing a weak link in a fire of a nuclear power plant, which is characterized in that: each fire district and each fire subdistrict are analyzed so as to identify the potential common model fault; and functional analysis is performed once more, and according to an analysis result, supplementary fire protection measures are taken for necessary potential common model points so as to ensure that the fire cannot cause the common model fault or further cause the loss of the necessary safety function of a machine set under the condition of normal operation or accident working condition. The method for analyzing the weak link in the fire greatly reduces the number of passive fire protection, and greatly saves project cost on the premise of ensuring the safety function of the nuclear power plant.

Description

Technical field [0001] The invention relates to a method for analyzing weak links in fire, in particular to a method for processing weak links in fire in a nuclear power plant. Background technique [0002] In the past two decades, my country’s nuclear power plants have grown from scratch, from small to large, and have begun to play a role in energy-scarce coastal areas. China has successively built the Qinshan Nuclear Power Station (a 300,000-kilowatt pressurized water reactor designed independently), the Daya Bay Nuclear Power Station (the introduction of 2×900,000-kilowatt pressurized water reactors from France), the Qinshan Phase II Nuclear Power Station (a 2×600,000-kilowatt pressurized water reactor), Ling Australia Nuclear Power Plant (main equipment imported from France’s 2×1 million kilowatt pressurized water reactor), Qinshan Phase III Nuclear Power Plant (introduced 2×700,000 kw heavy water reactor from Canada), Tianwan Nuclear Power Plant (introduced 2×1 million kilow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62C3/00
Inventor 信天民谭广萍刘文华王乐
Owner CHINA NUCLEAR POWER ENG CO LTD
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