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:
ainst 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 design parameters (e.g., overpressure) and physical phenomena (e.g., gas concentration) selected by the applicant for each design-basis event to ascertain that the values are comparable to those used in previous analyses and found to be acceptable by the staff. 7. The staff will evaluate each design-basis event to confirm that the design adequately accommodates the effects of the event on the safety features of the plant. 8. The staff will review accidents involving the release of smoke, flammable or nonflammable gases, or toxic-chemical-bearing clouds if the accidents are considered to be design-basis events. Safety Analysis Report (SAR) Section 6.4 should evaluate the effects of these accidents on control room habitability, and SAR Chapter 9 should assess the effects on the operation of diesel generators and other safety-related equipment. If the design details necessary for these evaluations are not available at the ESP stage, the evaluations will need to be performed at the COL stage. 9. The staff should give special attention to the review of standardized designs that propose criteria involving individual numerical probability criteria for individual classes of external man-made hazards. In such instances, the reviewer should establish that the envelope also includes an overall criterion that limits the aggregate probability of exceeding design criteria associated with all of the identified external man-made hazards. Similarly, special attention should be given to the review of a site if several man-made hazards are identified, but none of them individually has a probability exceeding the acceptance criteria stated herein. The objective of this special review should be to ensure that the aggregate probability of an outcome that may lead to unacceptable plant