Core control method

A core control method for boiling water reactors uses coordinated deep and shallow control rods to manage xenon-induced axial power distribution peaks, addressing the challenges of load-following operations and ensuring stable reactor operation.

JP7869110B2Active Publication Date: 2026-06-02HITACHI GE NUCLEAR ENERGY LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-10-26
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Boiling water reactors face challenges in controlling the axial power distribution during daily load-following operations due to xenon concentration changes, which can lead to peak increases and exceed fuel constraints, unlike pressurized water reactors.

Method used

A core control method involving the use of both deeply and shallowly inserted control rods, operated in coordination with xenon concentration changes, to suppress peak increases in axial power distribution.

Benefits of technology

The method effectively suppresses peak increases in axial power distribution during daily load-following operations, ensuring compliance with fuel constraints and maintaining reactor stability.

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Patent Text Reader

Abstract

To provide a reactor core control method capable of controlling peak increase of output distribution in the axis direction with control rods in daily load following operation suitable for boiling water reactors.SOLUTION: The reactor core control method in a nuclear power plant that performs daily load following operation, includes: a first step of executing a first-rod control in which a rod is inserted deeply into the reactor core in advance or a second-rod control in which a rod is shallowly inserted into the reactor core in advance after the load following operation from high output state to low output state and during returning to high power state; and a second step of operating a first control rod different from the control rod operated in the first step or a second control rod according to the decrease in 135Xe after that.SELECTED DRAWING: Figure 12
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Citation Information

Patent Citations

  • Power control method of atomic power plant

    JP1982014794A

  • Method of controlling boiling water type reactor

    JP1987247285A

  • Operation automation system for nuclear power plant

    JP1991081697A

  • Method and apparatus for controlling nuclear reactor with minium limit adjustment of boron concentration in load change

    JP1993240984A

  • Method for operating boiling water reactor

    JP1998282281A