Document: NRC Regulatory Guide
Document ID: f0baf50b-5bb7-4783-b2f9-9586e09c97e1
Document Type: regulatory_guide
Title: Preparation of Environmental Reports for Nuclear Power Stations + HISTORY - HISTORY 02/2017 – DG-4026 , Proposed Revision 3 09/2014 – Periodic Review of Revision 2 – Revise (Rev. 3)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML1611/ML16116A068.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.2
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Content:
be used, transfer factors, and possible mitigative actions; • description of the economic input data (e.g., land values, relocation costs, and cleanup costs) used in the analysis and an estimate of the economic cost risks from severe accidents; • description of surface-water users and watershed data used in the analysis and an estimate of severe accident population dose risks from the surface-water pathway; • description of aquifers used in the analysis and an estimate of severe accident population dose risks from the groundwater pathway; DG-4026, Page 109 • description of the comparison of the core damage frequencies estimated for the reactor to those for current-generation reactors and the comparison of the population dose risks to the mean and median values for current-generation reactors undergoing license renewal; and • description of individual (i.e., early fatality and latent cancer) risks and population dose risks from severe accidents; these risks should be compared to the Commission’s Safety Goals (51 FR 30028 (Ref. 75)) and with dose risks from routine and anticipated operational releases. NUREG/CR-4551, “Evaluation of Severe Accident Risks: Quantification of Major Input Parameters” (Ref. 76), demonstrates the development of the parameter information for the offsite environmental risk analysis of severe accidents (i.e., Level 3 PRA) that supported NUREG-1150, “Severe Accident Risks: An Assessment for Five U.S. Nuclear Power Plants” (Ref. 77). 5.11.3 Severe Accident Mitigation Alternatives The applicant should evaluate SAMAs, including procedures, training activities, and plant-design alternatives (i.e., SAMDAs), that could significantly reduce the environmental risks from a severe accident. SAMAs can reduce risk by preventing substantial core damage or by limiting radiological releases from containment in the event of substantial core damage. The current policy developed after the Limerick decision (Limerick Ecology Action vs. NRC,