| Budget Amount *help |
¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2018: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2017: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
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| Outline of Final Research Achievements |
A Monte Carlo calculation method for analyzing neutron noise propagation in a nuclear power reactor core caused by abnormal vibration of an in-core component has been developed. The method has been applied to analyses of neutron noise experiments in critical assemblies, where the neutron noises were produced by vibration of fuel or neutron absorber. Whereas the method does not yield sufficiently accurate result for the fuel vibration, reasonably accurate result is obtained for the absorber vibration. The method is applied to an experiment where void velocity in a water channel was measured using noise method in the critical assembly. A unique feature in the velocity measurement is revealed via the Monte Carlo analyses. The deviation of neutron noise in a reactor core from the point kinetics theory is investigated. A sensitivity analysis method for calculating sensitivity of neutron noise with respect to group constants that are used for neutron noise analyses has been developed.
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