Reactor monitoring test piece holder, shroud head bolt, shroud head bolt mount, and reactor monitoring test piece installation method

摘要

PROBLEM TO BE SOLVED: To provide a reactor monitoring test piece holder and the like, which can carry out additional installation of test pieces without the need for construction such as welding to a reactor pressure vessel or reactor internal structure. A reactor monitoring test piece holder fixed to a tea bar provided at a lower end portion of a shroud head bolt for fixing a shroud and a shroud head, the inside of which can be hermetically closed, A container-shaped test piece accommodating portion for accommodating a test piece for monitoring the soundness of the furnace, and the test piece accommodating portion disposed above the test piece accommodating portion and fixed to the lower side of the tea bar. And a fixing mechanism for doing so, and the entire shape can be inserted into a through hole through which the tea bar is inserted in the nuclear reactor. [Selection diagram] Figure 1