Irradiation temperature determination of HFIR target capsules using dilatometric analysis of silicon carbide monitors

Hirose, Takanori; Okubo, Nariaki   ; Tanigawa, Hiroyasu; Kato, Yutai*; Clark, A. M.*; McDuffee, J. L.*; Heatherly, D. W.*; Stoller, R. E.*

The objective of this work is to determine the irradiation temperatures of the HFIR target capsules JP-26 and JP-27, which were conducted under the Collaboration on Fusion Materials between Japan Atomic Energy Agency and the United States Department of Energy. The irradiation temperatures of the HFIR target capsules JP-26 and JP-27 were determined by dilatometric analysis of silicon carbide (SiC) passive temperature monitors. The monitors from holders for SSJ3 tensile specimens demonstrated good agreement with the design temperatures derived from finite element model (FEM) analysis and were consistent with post-irradiation hardness of F82H. Although the irradiation temperatures for some bend-bar (PCCVN and DFMB) holders were higher than FEM analysis, hardness tests on irradiated F82H implied that actual irradiation temperatures were close to the design temperatures.