Presentation Information
[2I15]Verification of the SRNM prediction method for the long-term shutdown BWR
*Yujin Furuta1, Daichi Yamada1, Yusuke Kuroda2, Takashi Yoshii2, Yousuke Miki2 (1. TEPCO HD, 2. TEPSYS)
Keywords:
Core loading,SRNM,Startup neutron source
Core loading was carried out after long-term shutdown in Kashiwazaki-Kariwa Unit-7.
During the loading, neutron is monitored to confirm subcritical state with the SRNM (Startup Range Neutron Monitor).To secure that function, 3 cps is required, which corresponds to detection limit. Therefore, we predicted neutron counts when fuels are loaded and determine necessity of external neutron source.
Now, as the neutron intensity of irradiated fuel is attenuated, high burn-up spent fuels are loaded around SRNM to maintain 3cps. Furthermore, we predicted the counts of temporary and final configuration, and determined the external neutron source is unnecessary.
As a result, the predicted counts shows good agreement with the measurement, and neutron source is not necessary for a certain period.
During the loading, neutron is monitored to confirm subcritical state with the SRNM (Startup Range Neutron Monitor).To secure that function, 3 cps is required, which corresponds to detection limit. Therefore, we predicted neutron counts when fuels are loaded and determine necessity of external neutron source.
Now, as the neutron intensity of irradiated fuel is attenuated, high burn-up spent fuels are loaded around SRNM to maintain 3cps. Furthermore, we predicted the counts of temporary and final configuration, and determined the external neutron source is unnecessary.
As a result, the predicted counts shows good agreement with the measurement, and neutron source is not necessary for a certain period.
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