Radiological Impact Assessment (RIA) following a postulated accident in PHWRS

Conference · Sun Jul 01 04:00:00 EDT 2012

OSTI ID:22106061

Soni, N.; Kansal, M.; Rammohan, H. P.; Malhotra, P. K. ^[1]

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1. Reactor Safety and Analysis, Nuclear Power Corporation of India Ltd., Nabhkiya Urja Bhavan, Anushakti Nagar, Mumbai Maharashtra 400094 (India)

Radiological Impact Assessment (RIA) following postulated accident i.e Loss of Coolant Accident (LOCA) with failed Emergency Core Cooling System (ECCS), performed as part of the reactor safety analysis of a typical 700 MWe Indian Pressurized Heavy Water Reactor(PHWR). The rationale behind the assessment is that the public needs to be protected in the event that the postulated accident results in radionuclide release outside containment. Radionuclides deliver dose to the human body through various pathways namely, plume submersion, exposure due to ground deposition, inhalation and ingestion. The total exposure dose measured in terms of total effective dose equivalent (TEDE) is the sum of doses to a hypothetical adult human at exclusion zone boundary by all the exposure pathways. The analysis provides the important inputs to decide upon the type of emergency counter measures to be adopted during the postulated accident. The importance of the various pathways in terms of contribution to the total effective dose equivalent(TEDE) is also assessed with respect to time of exposure. Inhalation and plume gamma dose are the major contributors towards TEDE during initial period of accident whereas ingestion and ground shine dose start dominating in TEDE in the extended period of exposure. Moreover, TEDE is initially dominated by I-131, Kr-88, Te-132, I-133 and Sr-89, whereas, as time progresses, Xe-133,I-131 and Te-132 become the main contributors. (authors)

• Research Organization: American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
• OSTI ID: 22106061
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
54 ENVIRONMENTAL SCIENCES
ADULTS
CONTAINMENT
DOSE EQUIVALENTS
ECCS
ENVIRONMENTAL IMPACTS
INDIA
INGESTION
INHALATION
IODINE 131
IODINE 133
KRYPTON 88
LOSS OF COOLANT
OCCUPATIONAL EXPOSURE
PHWR TYPE REACTORS
RADIATION DOSES
RADIONUCLIDE MIGRATION
REACTOR SAFETY
STRONTIUM 89
TELLURIUM 132
XENON 133