1977 年 14 巻 11 号 p. 791-804
A new analytical method is presented for analyzing, in three dimensions, the mechan-ical response of fuel pins with wire spacers, to their thermal and neutronic environment in a fuel assembly of a LMFBR. It analyzes the mechanical interactions between fuel pins in the assembly in each of three directions, which form an angle of π/3 radians with one another, based on the mathematical relationship between the displacements at the contact points and the associated contact forces with respect to all fuel pins forming a line in one of the three directions.
Based on this method, a new computational code, the Subchannel Deformation Analysis Code for Wire-Wrap Assemblies (SHADOW) has been developed, and is applied to a fuel assembly of a prototype fast breeder reactor in order to analyze the deformation of 169 fuel pins due to thermal bowing.
Conclusions drawn from the study confirm that the SHADOW code can be an effec-tive tool for analyzing or evaluating thermal and structural designs of a LMFBR fuel assembly.
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