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
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- HITACHI GE NUCLEAR ENERGY LTD
- 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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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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