Flow-induced vibration design guide for thermometer wells. Background document

The 1995 sodium leak incident of the secondary main piping of the prototype fast breeder reactor MONJU stemmed from the failure of a thermometer well, which was due to flow-induced vibration. JNC, Japan Nuclear Fuel Cycle Development Institute, formerly PNC, Power Reactor and Nuclear Fuel Development Corporation, prepared the Flow -induced Vibration Design Guide for Thermometer Wells (FIV-DG) in 1997, to prevent the recurrence of the similar phenomena. This document provides a detailed background for the FIV-DG, covering the basic design philosophy against flow-induced vibration, the explanation of each provision, the design methods and procedures employed, and supporting experimental data. Recent experimental results and findings, which were obtained after the establishment of the FIV-DG, are utilized to enrich this background document. (author)