Method for finishing out-of-pile detector scales through single in-pile flux measurement

A flux measurement and detector technology, applied in the field of nuclear power, can solve problems such as limited application and inability to completely eliminate disadvantages

CN107492399AActive Publication Date: 2017-12-19上海核星核电科技有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-12-19

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Abstract

The invention discloses a method for finishing out-of-pile detector scales through single in-pile flux measurement. The method is combined with site actual measurement and software numerical simulation calculation, pile core numerical simulation software is utilized to generate different axial power distribution shapes which are obtained by actually performing operation on a reaction pile in a traditional method, meanwhile primary in-pile flux measurement results of a nuclear power plant are utilized to obtain flexibility of all out-of-pile detectors, furthermore the detector flexibility is applied to correcting out-of-pile detector current obtained by software calculation, and finally a traditional data treating method is utilized to generate out-of-pile detector scale coefficients. According to the method disclosed by the invention, artificial disturbance is prevented from being introduced into the nuclear reaction pile, a nuclear accident risk is reduced, meanwhile considerable economical benefit is brought to the nuclear power plant, and finally the method can be applied to all active-service nuclear power units in China.
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Description

technical field

[0001] The invention belongs to the technical field of nuclear power, in particular to a method for calibrating an external detector in a nuclear power plant. Background technique

[0002] A nuclear reactor is the heart of a nuclear power plant, where nuclear energy is continuously converted into heat, and where radioactivity is most concentrated in a nuclear power plant. Always ensuring the safety of nuclear reactors and avoiding radioactive leakage is the most fundamental proposition of nuclear power plants. In order to provide continuous monitoring of nuclear reactors that are always sealed in heavy steel pressure vessels during operation, all pressurized water reactor nuclear power plants currently built in batches in my country are equipped with external nuclear radiation monitoring systems. The system is capable of monitoring the nuclear reactor from start-up to rated power operation. The monitoring signal under the normal power operation condition of ...

Examples

Embodiment Construction

[0085] The present invention is applied to a second-generation nuclear power unit in China, which has a ready-made response function of the external detector w i,j←l,m and core criticality-burnup calculation model, so the so-called data preparation step of the present invention can be omitted, and the core power distribution obtained by the latest regular in-core flux measurement can be directly applied Apply the following formula 5 to generate the current value under the core state without considering the specific sensitivity difference of the excore detector

[0086]

[0087] Here i is the channel number of the detector outside the stack, j is the number of different detectors in a channel, I i,j is the obtained corresponding detector current value, is the core power distribution given by the off-line flux map processing software of the power plant, such as CARIN, etc., by processing the in-core measurement signals, where l and m are the radial and axial grid identifie...