使用済み燃料貯蔵コンクリートキャスクキャニスタ候補材の破壊靱性特性(力学特性)

概要

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It is very significant to clarify the fracture toughness properties of candidate canister materials to ensure the structural integrity against the accidents during handling in the storage facility. Fracture toughness tests on the CT specimens cut from base metal, heat affected zone (HAZ) and weld metal in the 2 types of weld joints made by candidate canister materials (SUS329J4L duplex stainless steel and YUS270 super stainless steel) were conducted under various test temperature between 233K and 473K. Stable ductile crack extensions were observed in all of the specimens. The fracture toughness J_Q of the base metal and the HAZ of SUS329L4L showed the smallest value at 233K, and increased with temperature, then reached to the largest value at 298K. At the higher temperature, the value of J_Q decreased slightly with temperature. While, the value of J_Q in the weld metal increased with temperature. The value of J_Q of YUS270 increased with temperature. The values of J_Q for weld metal in both of the materials were not greater than those in base metal and HAZ at each test temperature. The values of J_Q in weld metal of both materials at 213K and 473K were greater than applied J derived from postulated semi-elliptical surface flaw and maximum allowable stress in JSME design coed. This result suggested that these materials have enough toughness for use as the canister material.
社団法人日本鉄鋼協会の論文
2005-05-01