The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16

Presented at:
The 5th International Symposium on SuperCritical Water-cooled Reactors
2011 March 13-16
Session Title:
Core Design

Shungo Sakurai (Toshiba Corporation)
Katsumi Yamada (International Atomic Energy Agency)
Shinichi Higuchi (Toshiba Corporation)
Yuki Ishiwatari (University of Tokyo)
Zhenqin Xiong (University of Tokyo)
Kazuaki Kito (Hitachi Limited)


A study on design of fuel and core for a Japanese Supercritical Water-cooled reactor (JSCWR) was carried out The SCWR core and fuel characteristics have been studied with a 3D core simulator which is based on a 3D BWR core simulator, because SCWR core characteristics strongly depend on fuel loading pattern and control rod patterns. Maximum cladding surface temperature (MCST) has been evaluated by a subchannel analysis code, because MCST depends on coolant flow distribution and local power distribution in a fuel assembly. The fuel assembly concept that is suitable for the JSCWR is developed. A radial enrichment distribution, an axial enrichment zoning in the fuel assembly, a fuel loading pattern and an orifice pattern that satisfy the core design criteria and its MCST targets were studied. Other characteristics (maximum linear heat generation rate, shutdown margin, etc.) and MCST were also studied. Engineering uncertainties were considered for the evaluation of MCST . It was shown that the highest MCST satisfied the design target with 99.99% probability and 95% confidence limits.

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