| 摘要 |
PROBLEM TO BE SOLVED: To prevent flow vibration of a neutron instrumentation guide pipe. SOLUTION: When supporting many neutron instrumentation guide pipes 2 by upper and lower incore stabilizers 3, 5 in a reactor pressure vessel 1, the upper incore stabilizer 3 is bonded to the inner surface of a core shroud 4, and the end parts of the lower incore stabilizer 5 are bonded to the neutron instrumentation guide pipes 2 arranged on the outermost periphery. The upper incore stabilizer 3 and the lower incore stabilizer 5 are connected together by providing a tie-bar 8 between them. The end parts of the lower incore stabilizer 5 are separated from a shroud support 6 and both are out of contact with each other, and therefore, the flow vibration to be transferred from the shroud support 6 to the neutron instrumentation guide pipes 2 can be prevented.
|
