Document: NUREG-0800
Document ID: 2bca792d-0e88-4e2d-b437-be572ed57a48
Document Type: srp
Title: REVIEW OF TRANSIENT AND ACCIDENT ANALYSIS METHODS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070820123.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15.0.2
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CFR Title: 

Content:
procedures that address all of these areas. The reviewers may conduct an audit of the implementation of the code developer’s quality assurance program. The reviewers should confirm that independent peer reviews were performed at key steps in the evaluation model development process. The peer review team should include programmers, developers, end users, and independent members with recognized expertise in relevant engineering and science disciplines, code numerics, and computer programming. Expert peer review team members, who were not directly involved in the evaluation model development and assessment, 15.0.2-13 March 2007 can enhance the robustness of the evaluation models. Further, they can be of value in identifying deficiencies that are common to large system analysis codes. 3. Independent Analysis. The reviewers may perform independent analyses in order to determine or confirm the importance of key phenomena and evaluate the impact of uncertainties in these phenomena on the key figures of merit in the plant calculation. The reviewers may want an independent determination of the importance of a high- ranking phenomenon, or to determine if a phenomenon not ranked as high by the licensee must be so ranked. Independent analysis may also be used to confirm uncertainty estimates. The Office of Nuclear Regulatory Research should be consulted, as needed, to accomplish these audits. 4. Review of General Purpose Computer Programs. Very often a general purpose transient analysis computer program, such as RELAP5, TRAC, or RETRAN, is developed to analyze a number of different events for a wide variety of plants. These codes can constitute the major portion of an evaluation model for a particular plant and event. Generic reviews are often performed for these codes to minimize the amount of work required for plant- and event-specific reviews. A certain amount of generic assessment may be performed for such a code as part of the generic code development. Applying portions