Document: NUREG-1555
Document ID: 0f68d035-9de9-494c-9ac9-3eae91036a7c
Document Type: esrp
Title: SEVERE ACCIDENTS
Source: NUREG-1555
Source URL: https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr1555/initial/
Revision Date: 2007-10
Chapter: 7
Section ID: 7.2
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adioactive materials or both entering environmental exposure pathways, including air, water, and groundwater. In-plant accident sequences that can lead to a spectrum of releases shall be discussed and shall include sequences that can result in inadequate cooling of reactor fuel and melting of the reactor core. The events arising from causes external to the plant that are considered possible contributors to the risk associated with the plant should be discussed. Socioeconomic impacts associated with emergency measures during or following an accident should also be discussed, and the environmental risks compared to and contrasted with radiological risks should be associated with normal and anticipated operational releases. The Commission also took the position that detailed quantitative considerations that form the basis of probabilistic estimates of releases do not need to be incorporated into the EIS, but shall be referenced, including references to safety evaluation reports. NUREG-1555 7.2-4 October 1999 III. REVIEW PROCEDURES Severe accidents are those involving multiple failures of equipment or function and, therefore, the likelihood of occurrence is lower for severe accidents than for DBAs, but the consequences of such accidents may be higher. The environmental consequences of severe accidents are estimated using acceptable methodology (such as the MACCS code package; Chanin et al. [1990]). The risks for specific accident types are defined as the product of the probability of that type of accident occurring multiplied by the estimated consequences for that type of accident. This ESRP section is designed to provide a methodology for reviewing the applicantGs probabilistic assessment of the dose consequences of severe accidents. When analyzing doses calculated to result from severe accidents, the reviewer should do the following: (1) Consult the reviewer (or review branch) for the IPE, the reviewer of Chapter 19 of the SAR, or the reviewer of 50.34(f) to determine