Abstract
We performed benchmark calculation for radioactivity activated in a Primary Containment Vessel (PCV) of a Boiling Water Reactor (BWR) by using MAXS library, which was developed by collapsing with neutron energy spectra in the PCV of the BWR. Radioactivities due to neutron irradiation were measured by using activation foil detector of Gold (Au) and Nickel (Ni) at thirty locations in the PCV. We performed activation calculations of the foils with SCALE5.1/ORIGEN-S code with irradiation conditions of each foil location as the benchmark calculation. We compared calculations and measurements to estimate an effectiveness of MAXS library.
Highlights
According to the Japanese law, any operating organization of decommissioning of nuclear facilities such as electric power companies needs to submit an application for decommissioning and to receive the authorization
We applied MAXS library, which is generated by collapsing with neutron energy spectrum at position, to activation calculation for radioactiveities measured with activation foils in the Primary Containment Vessel (PCV)
We performed activation calculations at the locations in the PCV of the Boiling Water Reactor (BWR) where radioactiveities of both Au and Ni were measured as benchmark calculation for MAXS library
Summary
According to the Japanese law, any operating organization of decommissioning of nuclear facilities such as electric power companies needs to submit an application for decommissioning and to receive the authorization. Use of ORIGEN-S cross section library that was developed by collapsing cross sections with a typical neutron energy spectrum of a Light Water Reactor (LWR) is considered to be inappropriate under the condition in the PCV. According to a comparison between the shape of the typical spectrum of a LWR and those of spectra in the PCV of the BWR, it would be inappropriate to apply ORIGEN library, which is generated with the typical spectrum, to activation calculation in the PCV. We applied MAXS library, which is generated by collapsing with neutron energy spectrum at position , to activation calculation for radioactiveities measured with activation foils in the PCV. 1.E+08 1.E+07 1.E+06 1.E+05 1.E+04 1.E+03 1.E+02 1.E+01 1.E+00 1.E-01 1.E-02 1.E-03 1.E-04 1.E-05
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