| 摘要 |
PROBLEM TO BE SOLVED: To provide an LPRM(local power region monitor) detector assembly capable of suppressing temperature rise around in-core housing. SOLUTION: A plurality of LPRM detectors 6 measuring neutron in power region of a reactor are contained in an LPRM detector container tube 13, which is loaded in the reactor pressure vessel 1 with the guide of an in-core guide tube 4. Reactor water flowing in the in-core guide tube 4 is circulated from middle holes 10 provided in the middle of the LPRM detector container tube 13 to upper holes 9 provided in the upper part of the LPRM detector container tube 13. As there is no circulation of reactor water in the lower part of the LPRM detector assembly 3, the temperature rise of in-core housing 5 is suppressed.
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