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Method for on-line monitoring neutron flux distribution of nuclear reactor core

A flux distribution and nuclear reactor technology, applied in the field of on-line monitoring of nuclear reactor core neutron flux distribution, can solve the problem of not being able to provide dynamic distribution information of neutron flux in the reactor

Inactive Publication Date: 2009-04-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is simple and easy to implement, but it cannot provide information on the dynamic distribution of neutron flux in the pile because it assumes that the shape of the neutron flux distribution in the pile does not change with time

Method used

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  • Method for on-line monitoring neutron flux distribution of nuclear reactor core
  • Method for on-line monitoring neutron flux distribution of nuclear reactor core
  • Method for on-line monitoring neutron flux distribution of nuclear reactor core

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Embodiment Construction

[0026] The idea of ​​the present invention is to linearly expand the neutron flux distribution in the real nuclear reactor core with the high-order harmonics of the reference core model, and obtain the expansion coefficient according to the readings of the neutron detectors arranged inside and outside the core, and then The real neutron flux distribution in the reactor core is reconstructed online, and the neutron flux distribution in the reactor core is displayed through the visualization system, which provides a reference for the control and protection of the reactor core.

[0027] The present invention will be further described below by taking a pressurized water reactor as an example.

[0028] The present invention is based on a reference core model. For convenience of description, it is first necessary to explain the reactor multi-group neutron diffusion equation characterizing the reference core model.

[0029] The reactor neutron diffusion equation is an equation about ...

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Abstract

The invention relates to the nuclear reactor core power monitoring field and discloses a method for online monitoring the neutron flux distribution of the reactor core. The method bases on M1 internal neutron detectors and M2 external neutron detectors which are arranged on the reactor. According to a reference reactor core model of a renewal reactor that MPhi is equal to (1 / k) FPhi, higher order harmonics are solved. Then, reading data of the internal neutron detectors and the external neutron detectors are combined. The neutron flux distribution in the core of a real reactor is reconstructed online.

Description

technical field [0001] The invention relates to the field of nuclear reactor core power monitoring, in particular to a method for on-line monitoring of nuclear reactor core neutron flux distribution. Background technique [0002] In order to ensure the safe operation of nuclear reactors, it is necessary to monitor the power distribution of the reactor core during operation. Taking the pressurized water reactor as an example, the core power distribution is generally monitored by monitoring the neutron flux distribution in the nuclear reactor. [0003] The existing PWR neutron measurement systems are divided into mobile in-reactor neutron measurement systems and out-of-reactor neutron measurement systems. [0004] The mobile in-core neutron measurement system works intermittently, and its working frequency is generally once a month. The detectors of the mobile neutron measurement system are small fission chambers. The system sends 5 groups of detectors to the bottom of the c...

Claims

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Application Information

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IPC IPC(8): G21C17/108
CPCY02E30/30
Inventor 吴宏春王常辉曹良志
Owner XI AN JIAOTONG UNIV
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