Document: NUREG-0800
Document ID: 012102de-40de-45a0-a3dc-8159ee34baa5
Document Type: srp
Title: EVALUATION OF POTENTIAL ACCIDENTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0704/ML070460336.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.2.3
CFR Part: 
CFR Title: 

Content:
ocedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant's evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. 2.2.3-5 Revision 3 - March 2007 1. The staff should estimate the probability of occurrence of the initiating events leading to potential consequences that exceed the 10 CFR 50.34(a)(1) exposure guidelines as it relates to the requirements of 10 CFR Part 100 exposure guidelines by using assumptions that are as representative of the specific site as is practicable. Because of the difficulty of assigning accurate numerical values to the expected rate of unprecedented potential hazards generally considered in this SRP section, judgment must be used to assess the acceptability of the overall risk presented. Chapter 2 of Regulatory Guide 1.70 offers specific guidance regarding offsite hazards. 2. The staff may need to consult with, obtain specific data from, or request other technical support from NRC organizations with expertise in areas such as mechanical, chemical, or civil engineering; statistical analyses; or plant systems. 3. The staff will review the applicant’s probability calculations and perform an independent probability analysis if the potential hazard is considered sufficiently significant to affect the ability of the site to be licensed or is important to the identification of design-basis events. 4. The staff will identify and evaluate all stochastic variables that affect the occurrence or severity of the postulated event. The staff will determine if these variables are independent or conditioned by other variables. 5. The staff should test probabilistic models against all available information. If the model or any portion of it, by simple extension, can be used to predict an observable accident rate, this test should be performed. 6. The staff will review the