Development of a reliable estimation procedure of radioactivity inventory in a BWR plant due to neutron irradiation for decommissioning

Reliable information of radioactivity inventory resulted from the radiological characterization is important in order to plan decommissioning planning and is also crucial in order to promote decommissioning in effectiveness and in safe. The information is referred to by planning of decommissioning s...

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Main Authors: Tanaka Ken-ichi, Ueno Jun
Format: Article
Language:English
Published: EDP Sciences 2017-01-01
Series:EPJ Web of Conferences
Online Access:https://doi.org/10.1051/epjconf/201715305019
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author Tanaka Ken-ichi
Ueno Jun
author_facet Tanaka Ken-ichi
Ueno Jun
author_sort Tanaka Ken-ichi
collection DOAJ
description Reliable information of radioactivity inventory resulted from the radiological characterization is important in order to plan decommissioning planning and is also crucial in order to promote decommissioning in effectiveness and in safe. The information is referred to by planning of decommissioning strategy and by an application to regulator. Reliable information of radioactivity inventory can be used to optimize the decommissioning processes. In order to perform the radiological characterization reliably, we improved a procedure of an evaluation of neutron-activated materials for a Boiling Water Reactor (BWR). Neutron-activated materials are calculated with calculation codes and their validity should be verified with measurements. The evaluation of neutron-activated materials can be divided into two processes. One is a distribution calculation of neutron-flux. Another is an activation calculation of materials. The distribution calculation of neutron-flux is performed with neutron transport calculation codes with appropriate cross section library to simulate neutron transport phenomena well. Using the distribution of neutron-flux, we perform distribution calculations of radioactivity concentration. We also estimate a time dependent distribution of radioactivity classification and a radioactive-waste classification. The information obtained from the evaluation is utilized by other tasks in the preparatory tasks to make the decommissioning plan and the activity safe and rational.
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spelling doaj.art-c3dd6b24bfef46f0b3d7f9e3b340372a2022-12-21T22:36:12ZengEDP SciencesEPJ Web of Conferences2100-014X2017-01-011530501910.1051/epjconf/201715305019epjconf_icrs2017_05019Development of a reliable estimation procedure of radioactivity inventory in a BWR plant due to neutron irradiation for decommissioningTanaka Ken-ichiUeno Jun0Genden Information System CompanyReliable information of radioactivity inventory resulted from the radiological characterization is important in order to plan decommissioning planning and is also crucial in order to promote decommissioning in effectiveness and in safe. The information is referred to by planning of decommissioning strategy and by an application to regulator. Reliable information of radioactivity inventory can be used to optimize the decommissioning processes. In order to perform the radiological characterization reliably, we improved a procedure of an evaluation of neutron-activated materials for a Boiling Water Reactor (BWR). Neutron-activated materials are calculated with calculation codes and their validity should be verified with measurements. The evaluation of neutron-activated materials can be divided into two processes. One is a distribution calculation of neutron-flux. Another is an activation calculation of materials. The distribution calculation of neutron-flux is performed with neutron transport calculation codes with appropriate cross section library to simulate neutron transport phenomena well. Using the distribution of neutron-flux, we perform distribution calculations of radioactivity concentration. We also estimate a time dependent distribution of radioactivity classification and a radioactive-waste classification. The information obtained from the evaluation is utilized by other tasks in the preparatory tasks to make the decommissioning plan and the activity safe and rational.https://doi.org/10.1051/epjconf/201715305019
spellingShingle Tanaka Ken-ichi
Ueno Jun
Development of a reliable estimation procedure of radioactivity inventory in a BWR plant due to neutron irradiation for decommissioning
EPJ Web of Conferences
title Development of a reliable estimation procedure of radioactivity inventory in a BWR plant due to neutron irradiation for decommissioning
title_full Development of a reliable estimation procedure of radioactivity inventory in a BWR plant due to neutron irradiation for decommissioning
title_fullStr Development of a reliable estimation procedure of radioactivity inventory in a BWR plant due to neutron irradiation for decommissioning
title_full_unstemmed Development of a reliable estimation procedure of radioactivity inventory in a BWR plant due to neutron irradiation for decommissioning
title_short Development of a reliable estimation procedure of radioactivity inventory in a BWR plant due to neutron irradiation for decommissioning
title_sort development of a reliable estimation procedure of radioactivity inventory in a bwr plant due to neutron irradiation for decommissioning
url https://doi.org/10.1051/epjconf/201715305019
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AT uenojun developmentofareliableestimationprocedureofradioactivityinventoryinabwrplantduetoneutronirradiationfordecommissioning