Iodine transport analysis in the ESBWR.

Kalinich, Donald A. ; Gauntt, Randall O. ; Young, Michael Francis ; Longmire, Pamela

Sandia National Laboratories

关键词: Iodine;    Computerized Simulation;    Iodine-Transport Properties.;    Vapors;    Meltdown Reactor Core Meltdown -Analysis;   

DOI  :  10.2172/953728
RP-ID  :  SAND2009-1702
RP-ID  :  AC04-94AL85000
RP-ID  :  953728

美国|英语

来源: UNT Digital Library

【 摘 要 】

A simplified ESBWR MELCOR model was developed to track the transport of iodine released from damaged reactor fuel in a hypothesized core damage accident. To account for the effects of iodine pool chemistry, radiolysis of air and cable insulation, and surface coatings (i.e., paint) the iodine pool model in MELCOR was activated. Modifications were made to MELCOR to add sodium pentaborate as a buffer in the iodine pool chemistry model. An issue of specific interest was whether iodine vapor removed from the drywell vapor space by the PCCS heat exchangers would be sequestered in water pools or if it would be rereleased as vapor back into the drywell. As iodine vapor is not included in the deposition models for diffusiophoresis or thermophoresis in current version of MELCOR, a parametric study was conducted to evaluate the impact of a range of iodine removal coefficients in the PCCS heat exchangers. The study found that higher removal coefficients resulted in a lower mass of iodine vapor in the drywell vapor space.