Document: NUREG-0800
Document ID: b6b57a00-5b85-4f0c-965c-ca89ef4265e7
Document Type: srp
Title: DETERMINATION OF RUPTURE LOCATIONS AND DYNAMIC EFFECTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1608/ML16088A041.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.2
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CFR Title: 

Content:
based on fundamental hydrodynamic and thermodynamic laws. The applicant’s structural analyses should include both static and dynamic analyses and be of sufficient fidelity to capture the motion and stresses within SSCs in the proposed plant design. Dynamic analyses of SSCs may generally use a structural damping coefficient of no greater than 1 percent, with higher damping specifications substantiated by rigorous testing data. The staff also reviews the application to verify that the applicant’s procedure for addressing the uncertainties in the frequencies of structural resonances, as well as within oscillatory loads, is specified and evaluated to demonstrate that worst-case coupling between loads and structural response is assessed. Any bias errors in the loading and structural evaluation procedures are properly accounted for. Moreover, the staff determines that the applicant’s resulting structure responses for all the applicable SSCs are within the allowable stress limit specified in acceptable codes and standards to which the applicant has committed. Finally, the staff reviews representative examples provided by the applicant which demonstrates the applicability of the overall end-to-end assessment procedures to the proposed design. The staff intends to provide general guidance for modeling dynamic jet effects in the future. Developing the supporting data requires further research and testing; therefore, for the near term, the staff will continue to review on a case-by-case basis as described above. References 1. American Nuclear Society. “Design Basis for Protection of Light Water Nuclear Power Plants Against the Effects of Postulated Pipe Rupture,” ANSI/ANS 58.2-1988, LaGrange, IL., 1988 Edition, 2. Ransom, V., “Comments on GSI-191 Models for Debris Generation,” September 14, 2004, ADAMS Accession No. ML050830341, and No. ML051320338 3. Wallis, G., “The ANSI/ANS Standard 58.2-1988: Two Phase Jet Model,” September 14, 2004, ADAMS Accession No.