| 摘要 |
PROBLEM TO BE SOLVED: To provide a lid structure of a reactor pressure vessel that has high processibility and high accuracy. SOLUTION: A lid section 6 and a support rug 7 are integrally drilled by lathe processing so that the support rug 7 for supporting an apparatus forms a concentric annular shape with respect to the lid section 6 to be fastened with a pressure vessel body. Thanks to such constitution, the processing is facilitated, the apparatus assembling part of the support rug 7 is finished on the same plane, and the accuracy is improved. COPYRIGHT: (C)2009,JPO&INPIT
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