I. Ioka et al., EXPERIMENTAL AND ANALYTICAL RESULTS FOR C OOLING PERFORMANCE OF HTTR CORE BOTTOM STRUCTURE USING HENDEL-T-2, Nippon Genshiryoku Gakkaishi, 37(3), 1995, pp. 217-227
An In-core Structure Test Section (HENDEL-TB) is a full scale simulati
on model of the core bottom structure of High Temperature Engineering
Test Reactor (HTTR). Experimental studies on cooling performance of th
e core bottom structure were carried out by the use of the HENDEL-T-2
to verify integrity of the metal structures. Experimental results show
ed that the temperature distribution of the core bottom structure was
almost uniform in the circumferential direction. The temperatures of t
he metal structures were lower than the design temperatures. The heat
transfer from the hot helium gas to the cold helium gas was negligibly
small in the core bottom structure. The leakage flow of cold helium g
as through the gaps of core bottom structure increased with the pressu
re difference between the hot and cold helium gases. However, there wa
s no effect of the pressure difference on the temperature distribution
of the core bottom structure in the circumferential direction. The de
tailed temperature distribution of the core bottom structure in HTTR w
as calculated by a three-dimensional thermal analysis code. Remarkably
hot region in the core support plate could not be found in the analys
is. The calculated temperatures of the metal structures for HTTR were
lower than the design temperatures at the end of HTTR's life.