| 摘要 |
PROBLEM TO BE SOLVED: To prevent damaging control rod of control rod cluster by hitting angle members of a spent fuel rack when the control rod cluster is hung up from the spent fuel rack. SOLUTION: Before an inspection device is set on a spent fuel rack, a cylindrical assistance tool 6 for control rod cluster inspection is hung down in the spent fuel rack, and the assistance tool 6 for control rod cluster inspection surrounds the control rod cluster to inspect.
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