Document: NUREG-0800
Document ID: 2717fe7f-71fd-4f1e-bd08-7685b24763ba
Document Type: srp
Title: Standard Review Plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsible for th
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0301/ML030160606.pdf
Revision Date: 2023-06
Chapter: 15
Section ID: 15
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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. 4. 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 13 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 Research should be consulted, as needed, to accomplish these audits. 5. 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 of the review process to a general purpose transient analysis computer program is required to determine its suitability for use as the basis for an evaluation model. The review process for the general purpose transient analysis computer program may indicate that the code models and generic assessment do not include all the appropriate geometry, phenomena, or the necessary range of variables to demonstrate code adequacy for some of the intended plant-specific event analyses. In order to avoid problems in the review, it is important that the submitted code documentation identify the intended range of applicability of the generic code, including its