CONTROL ROD OPERATION MONITORING METHOD AND CONTROL ROD OPERATION MONITORING SYSTEM

Title:

CONTROL ROD OPERATION MONITORING METHOD AND CONTROL ROD OPERATION MONITORING SYSTEM

Document Type and Number:

WIPO Patent Application WO/2017/154275

Kind Code:

A1

Abstract:

Provided is a control rod operation monitoring method that is capable of enhancing the accuracy of determination as to whether to generate a control rod insertion prevention signal during the operation of a nuclear reactor. Four neutron detector assemblies 5A, 5B, 5C, 5D that include a plurality of LPRMs 6 disposed in the axial direction of a reactor core are disposed so as to be adjacent to each of a plurality of insertion selection control rods 4 that are simultaneously inserted into the reactor core. Neutron flux ratio calculation units 51 that are provided for every four or three neutron detector assemblies 5 use neutron flux ratio calculation devices 13A to calculate the ratios (BA/AA, CA/AA, and DA/AA) of the average LPRM signals of the LPRMs 6 at a position B, a position C, and a position D to the average LPRM signal of the LPRMs 6 at a position A that is the closest to the control rod insertion end of the reactor core. When the maximum neutron flux ratio from among these neutron flux ratios exceeds a set neutron flux ratio, a control rod insertion prevention signal generated by a local-area control-rod-insertion monitoring device 11A is output.

Inventors:

MATSUMOTO KOJI (JP)
ISHII KAZUYA (JP)
KONDOU TAKAO (JP)
KONOMA AKIRA (JP)
TSUCHIYA AKIYUKI (JP)

Application Number:

PCT/JP2016/084879

Publication Date:

September 14, 2017

Filing Date:

November 25, 2016

Export Citation:

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Assignee:

HITACHI GE NUCLEAR ENERGY LTD (JP)

International Classes:

G21C17/10; G21C7/36

Foreign References:

JPS57136197A	1982-08-23
JPH01214794A	1989-08-29
JPH01253695A	1989-10-09
JP2004245666A	2004-09-02
JPS60220895A	1985-11-05

Other References: