FUEL ASSEMBLY MECHANICAL FLOW REGULATOR FOR DETECTING FAILURE OF FUEL ROD AT THE POINT IN FUEL ASSEMBLY IN REACTOR SHUTDOWN

摘要

PROBLEM TO BE SOLVED: To provide a device for detecting a failed fuel element in a BWR. SOLUTION: In a fuel assembly mechanical flow regulator 100, a testing hood 102 is provided, the testing hood has an upper plate 106 and side plate 108 and the side plate is to touch a core upper guide structure 54. A flow regulator is positioned upward a fuel assembly 12 in the testing hood 102 and the flow regulator has a seal plate 152. A probe assembly 130 has a probe head 132. A means for positioning the seal plate of the flow regulator at the upper edge of the outer channel 12 of a fuel assembly. A means 112 for dipping the probe head in the fuel assembly reactor cooling water in the outer channel is provided.