Document: NRC Regulatory Guide
Document ID: 01fb3132-b05a-41a0-ab81-466a6fb6f4d3
Document Type: regulatory_guide
Title: Preparation of Environmental Reports for Nuclear Power Plant License Renewal Applications (Rev. 1)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0916/ML091620409.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.2S1
CFR Part: 
CFR Title: 

Content:
g the analysis, the applicant should consider the methodology presented in NUREG/BR-0184, “Regulatory Analysis Technical Evaluation Handbook,” issued January 1997, and the guidance provided in NEI 05-01, Revision A, “Severe Accident Mitigation Alternatives (SAMA) Analysis Guidance Document,” issued November 2005 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML060530203). The ER should present the results of the following analytical steps and describe the methodology or analytical process used: 1. Based on the plant-specific risk study and supplementary analyses, identify and characterize the leading contributors to core damage frequency and offsite risk (i.e., population dose). The frequency of and contributors to core damage frequency and large release frequency are generally available from the plant-specific risk study. Development of offsite risk information may require additional site-specific analyses if the existing risk study does not include an assessment of offsite consequences. 2. From the external event analyses, provide estimates of the incremental contribution to core damage frequency and population dose from external events. 3. Identify practical physical plant modifications and plant procedural and administrative changes that can reduce severe accident dose consequence risk, considering both internal and external events. For each modification or change, estimate the approximate reduction in risk. 4. Estimate the value of the reduction in risk. Value is usually calculated for public health, occupational health, offsite property, and onsite property. Chapter 5 of NUREG/BR-0184 provides a detailed discussion of value calculation. 5. Estimate the approximate cost of each modification and procedural and administrative change found to reduce the dose consequence risk of severe accidents. Potential SAMAs that are not expected to be cost beneficial, even when uncertainties in the analysis are taken into consideration, may be