The main control room (MCR) ventilation system has been designed to maintain habitability of the control room envelope both under normal condition and accident condition. The system adopting dual air intakes adds one more air intake for accidents at suitable position. During accidents, the air intake with lower contamination will be selected and the other with higher contamination will be isolated, to reduce the amount of radioactive substances entering MCR extremely and enhance the habitability of MCR envelop. This paper is devoted to research on the impact of switching time interval (STI) for dual intakes on workers in main control room during accidents. As the contamination condition varies, the switching action will be happened. Switching time interval (STI) referred in this paper means the time between two switching actions. When accidents occur, the air intake will operate and switch between two intakes automatically. The action of switching will be influenced by several parameters: the meteorological conditions of the site, the response features of the monitoring instruments and the source term released to the environment after accidents. Analysis of these parameters and their sensitivity analysis are performed, which show that the ventilation system cannot afford too frequent switching actions resulted from instantaneous sudden changes of intake’s activity. That’s the reason why it is necessary to set a minimum STI which means the contamination of one intake have to be lower than the other intake and this dominant position should be kept longer than the minimum STI, if not, the switching action will not be happened. As it is essential to set a minimum STI to prevent frequent switching of system, the analysis of its impact on the atmospheric relative concentrations and the doses of the workers in main control room are performed on basis of specific site meteorological condition and the response characteristic of dose monitoring instruments. Three kinds of accident release conditions are considered, which are relief valve release, containment leakage and elevated funnel release. The atmospheric relative concentrations and the doses of the workers in MCR are evaluated for every case and compared with the dose limits. Finally an acceptable minimum STI of dual air intakes is recommended.
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2017 25th International Conference on Nuclear Engineering
July 2–6, 2017
Shanghai, China
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5785-4
PROCEEDINGS PAPER
Impact of Switching Time Interval for Dual Intakes on Workers in Main Control Room During Accidents
Xue Na,
Xue Na
China Nuclear Power Engineering Co, Ltd, Beijing, China
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Lin Hongtao,
Lin Hongtao
China Nuclear Power Engineering Co, Ltd, Beijing, China
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Liu Xinjian,
Liu Xinjian
China Nuclear Power Engineering Co, Ltd, Beijing, China
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Mao Yawei,
Mao Yawei
China Nuclear Power Engineering Co, Ltd, Beijing, China
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Qiu Lin
Qiu Lin
China Nuclear Power Engineering Co, Ltd, Beijing, China
Search for other works by this author on:
Xue Na
China Nuclear Power Engineering Co, Ltd, Beijing, China
Lin Hongtao
China Nuclear Power Engineering Co, Ltd, Beijing, China
Liu Xinjian
China Nuclear Power Engineering Co, Ltd, Beijing, China
Mao Yawei
China Nuclear Power Engineering Co, Ltd, Beijing, China
Qiu Lin
China Nuclear Power Engineering Co, Ltd, Beijing, China
Paper No:
ICONE25-67742, V007T10A037; 6 pages
Published Online:
October 17, 2017
Citation
Na, X, Hongtao, L, Xinjian, L, Yawei, M, & Lin, Q. "Impact of Switching Time Interval for Dual Intakes on Workers in Main Control Room During Accidents." Proceedings of the 2017 25th International Conference on Nuclear Engineering. Volume 7: Fuel Cycle, Decontamination and Decommissioning, Radiation Protection, Shielding, and Waste Management; Mitigation Strategies for Beyond Design Basis Events. Shanghai, China. July 2–6, 2017. V007T10A037. ASME. https://doi.org/10.1115/ICONE25-67742
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