Document: NUREG-0800
Document ID: 70c3a8b3-09b7-4616-9cdb-338f1d2c08a0
Document Type: srp
Title: EVALUATION OF POTENTIAL ACCIDENTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070222.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.2.3
CFR Part: 
CFR Title: 

Content:
al exposures in excess of the 10 CFR Part 100 guidelines is estimated to exceed the NRC staff objective of approximately 10-7 per year. 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 as to the acceptability of the overall risk presented. The probability of occurrence of the initiating events leading to potential consequences in excess of 10 CFR Part 100 exposure guidelines should be estimated using assumptions that are as representative of the specific site as is practicable. In addition, because of the low probabilities of the events under consideration, data are often not available to permit accurate calculation of probabilities. Accordingly, the expected rate of occurrence of potential exposures in excess of the 10 CFR Part 100 guidelines of approximately 10 per year is acceptable if, when combined -6 with reasonable qualitative arguments, the realistic probability can be shown to be lower. 2.2.3-3 DRAFT Rev. 3 - April 1996 The effects of design basis events have been adequately considered if analyses of the effects of those accidents on the safety-related features of the plant have been performed and measures have been taken (e.g., hardening, fire protection) to mitigate the consequences of such events. Technical Rationale The technical rationale for application of acceptance criteria for the evaluation of potential accidents is discussed in the following paragraphs:23 Compliance with 10 CFR 100.10 requires that evaluation of reactor sites include factors related to proposed reactor designs as well as to characteristics peculiar to individual sites. Through its design, construction, and operation, a reactor should reflect an extremely low probability for accidents that could result in release of significant quantities of radioactive fission products. In addition, the site's location and engineered features included as