2006 Fiscal Year Final Research Report Summary
A safety research on nuclear reactors based on the microscopic reactor physics
| Project/Area Number |
16360475
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | Osaka University |
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Principal Investigator |
TAKEDA Toshikazu Osaka University, Graduate School of Engineering, Prof., 大学院工学研究科, 教授 (30116058)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Toshihisa Osaka University, Graduate School of Engineering, Assoc.Prof., 大学院工学研究科, 助教授 (50273602)
KIIADA Takanori Osaka University, Graduate School of Engineering, Assistant Prof, 大学院工学研究科, 助手 (60263208)
UNESAKI Hironobu Kyoto University, Reactor Research Institute, Assoc.Prof., 原子炉実験所, 助教授 (40213467)
YAMANE Yoshihiro Nagoya University, Graduate School of Engineering, Prof., 大学院工学研究科, 教授 (60115649)
HASHIMOTO Kengo Kinki University, Atomic Energy Research Institute, Assoc.Prof., 原子力研究所, 助教授 (70218410)
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| Project Period (FY) |
2004 – 2006
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| Keywords | reactivity coefficient / dynamic parameters / the Doppler reactivity / the microscopic reactor physics / dynamic rod worth measurement / parallel computing / nuclear reactor safety |
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| Research Abstract |
It is highly important to evaluate the physical quantities such as 'reactivity coefficient' and 'dynamic parameters' in nuclear reactor safety analysis. Especially, the Doppler reactivity plays an important role in the estimation of reactor accident sequences. The Doppler reactivity is given as the multiplication of effect of Doppler broadening of heavy nuclides due to unit rise in the temperature, and the average temperature rise in the fuel. Thus the exact treatment of the detailed temperature distribution is necessary at each time step in the dynamic calculations. Generally, such calculations are possible by application of detailed time step models using existent codes, however, the requirement of calculation makes such calculations unrealistic. In the present study, the parallel computation algorithm was applied to resolve the problem.
In contrast, in the field of measurements, the dynamic rod worth was introduced as a new method to measure the control rod worth of a reactor. This method enables to reduce the requirement in both the procedures and time, thus considered as promising. Actually, the U.S. Nuclear Regulatory Committee has approved it as a standard measure used in reactor startup testing. Despite the fact, detailed researches have not been made to backbone the legitimacy yet. In order to clear the point, a detailed analysis was performed using a dynamic calculation model that treats the local dependence of neutron flux and its time-dependency at the same time. The analysis was done for the rod drop measurements with different insertion speeds of the control rods, which were performed in Kinki University Training Reactor, however, any distinct difference was not observed between the new method and the conventional method.
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