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Evaluation of the Activated Radioactivity of Turbine Equipments in BWR

[+] Author Affiliations
Masato Watanabe, Motonori Nakagami

Chubu Electric Power Co., Inc., Nagoya, Aichi, Japan

Paper No. ICEM2010-40294, pp. 463-470; 8 pages
  • ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management
  • ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, Volume 1
  • Tsukuba, Japan, October 3–7, 2010
  • Conference Sponsors: Nuclear Engineering Division and Environmental Engineering Division
  • ISBN: 978-0-7918-5452-5 | eISBN: 978-0-7918-3888-4
  • Copyright © 2010 by ASME


The activated radioactivity of turbine equipments irradiated by neutron originating from 17 N in the main stream is evaluated for an introduction of clearance system to boiling-water reactor (BWR) plant. The 17 N, main neutron source is generated by 17 O(n, p)17 N reaction in the core region. The evaluation results clarified that the activated radioactivity of the turbine equipment is extremely small comparing to the clearance level. The feature of the evaluation is as follows. (1) Actual radioactive concentration of the 17 N in the main steam in Hamaoka nuclear power station unit 5 (Hamaoka-5) which is an advanced boiling-water reactor (ABWR) was measured with solid-state track detector (SSTD). The 17 N concentration is used for the neutron transport calculation as initial neutron sources. (2) The turbine equipments were modeled as two-dimensional geometry for DORT code. (3) Activation cross-sections for major nuclides subject to the clearance evaluation were based on JENDL3.3 on 175 energy group structure (VITAMIN-J). (4) Minor nuclides subject to the clearance evaluation were calculated with ORIGEN-S code.

Copyright © 2010 by ASME



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