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research-article

Effects of Filtered Containment Venting on Fission Product Releases during CANDU Reactor Severe Accidents

[+] Author and Article Information
A. C. Morreale

Canadian Nuclear Laboratories, 286 Plant Road, Chalk River, Ontario, Canada, K0J 1J0
andrew.morreale@cnl.ca

L. S. Lebel

Canadian Nuclear Laboratories, 286 Plant Road, Chalk River, Ontario, Canada, K0J 1J0
Luke.Lebel@cnl.ca

M. J. Brown

Canadian Nuclear Laboratories, 286 Plant Road, Chalk River, Ontario, Canada, K0J 1J0
morgan.brown@cnl.ca

1Corresponding author.

ASME doi:10.1115/1.4035434 History: Received July 06, 2016; Revised December 06, 2016

Abstract

Severe accidents are of increasing concern in the nuclear industry worldwide since the accidents at Fukushima Daiichi (March 2011). These events have significant consequences that must be mitigated to ensure public and employee safety. Filtered containment venting systems are beneficial in this context as they would help to maintain containment integrity while also reducing radionuclide releases to the environment. This paper explores the degree to which filtered containment venting would reduce fission product releases during two CANDU 6 severe accident scenarios, namely a station blackout and a large loss of coolant accident (with limited emergency cooling). The effects on the progression of the severe accident and radionuclide releases to the environment are explored using the MAAP-CANDU integrated severe accident analysis code. The stylized filtered containment venting system model employed in this study avoids containment failure and significantly reduces radionuclide releases by 95-97% for non-noble gas fission products. Filtered containment venting is shown to be a suitable technology for the mitigation of severe accidents in CANDU, maintaining containment integrity and reducing radionuclide releases to the environment.

Copyright (c) 2016 by ASME
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