Document: NUREG-0800
Document ID: f03d2c71-27a1-41fd-9362-1e62c6142e13
Document Type: srp
Title: Containment Systems and Severe Accidents (Tier 1)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070653.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.11
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CFR Title: 

Content:
feguards information residing in any separate, external documents. 3. Probabilistic Risk Assessment (PRA) Information For the evolutionary design reviews, industry requested deletion of certain design probabilistic risk assessment (PRA) information from the DCD because of questions on the regulatory significance of that information. The PRA was used in the design review to determine the risk significance of key structures, systems, and components. The NRC concluded that the detailed methodology and quantitative portions of the design PRA did not need to be included in the DCD but the assumptions, insights, and discussions of PRA analyses must be retained in the DCD. DRAFT Rev. 0 - April 1996 14.3-12 If the detailed portions of the PRA are not intended to be included in the DCD, the objective should be to provide sufficient structure and detail that COL applicants or licensees may fill in detailed design information using the design certification PRA as a baseline. Essentially, only selected quantitative portions should not be included in the DCD. Additional guidance is listed in the following paragraphs. a. The details of the PRA are necessary for the staff to evaluate the risk significance of structures, systems, and components of the design during its review. However, to facilitate the removal of the detailed quantitative portion of the PRA at the completion of the design review, the staff believes that separate sections in the DCD or external reports should be developed for the PRA models, data, and quantitative analyses that support the results, qualitative discussion, and safety insights for the design. b. Detailed discussions of PRA data analysis may be removed, but PRA insights, assumptions, results, sensitivity study results, and importance rankings should be retained. Any sections of information that were deleted should be indicated in the DCD, and should be contained in a separate, external report. Deterministic severe accident and shutdown risk analyses