| 摘要 |
PURPOSE:To decrease weld points and components in number and to improve the reliability of a clamping device for a structure in a nuclear reactor by coupling the collar and ring-shaped projection of a shroud head bolt with a rod integrally. CONSTITUTION:A lock pin 34 is welded directly to the rod 32 and stood on the rod. The specific collar is coupled integrally to form the rod 32 to a large diameter so that it swells out from a position a little bit higher than the lock pin 34 to a T bar 11. Further, the ring-shaped projection 35 of a projection step part is coupled integrally with the rod 32. Consequently, weld points and components are reducible in number and a fine gap is eliminated, so stress corrosion cracking due to the fine gap is eliminated and the reliability of shroud heat bolt is improved. The ring-shaped projection part 35 may be coupled integrally with the T bar 11.
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