Document: NUREG-0800
Document ID: 63f62189-691f-402d-9ac9-41fb60ec2261
Document Type: srp
Title: DETERMINATION OF RUPTURE LOCATIONS AND DYNAMIC EFFECTS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1423/ML14230A035.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.6.2
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CFR Title: 

Content:
licant develops a methodology to address the dynamic effects of postulated high energy line breaks and submits it as part of the application. The staff reviews each design certification document (DCD) to verify the adequacy of the modeling for dynamic jet loads including the blast wave effects for their specific piping system design condition (including source and exterior fluid temperature and pressure, and pipe size) and plant design configuration (including spatial interactions between the postulated pipe breaks and neighboring SSCs). In previous reviews of new reactor design certification applications, the staff noted that applicants did not fully address the potential non-conservatisms described above, necessitating requests for additional information (RAIs). The staff asked questions related to the potential nonconservatisms described above, including omitting blast wave effects, assuming uniform jet plume expansion, simplifying the spatial pressure distribution within the jet plume, and ignoring the jet dynamic loading and structural dynamic response (e.g., potential feedback amplification of blowdown forces and jet resonance effects). Each applicant was requested to explain what analysis and/or testing has been used to substantiate the jet expansion and jet loading modeling for their specific piping system design conditions and plant design configuration as described in the respective DCD. Most of the information on how other applicants addressed the concerns is proprietary. High level summaries, however, are in the DCDs and the staff’s safety evaluation reports (SERs) and may be used for guidance on future applications. Staff Review Process The following paragraphs summarize the staff’s review process for assessing the adequacy of the applicants’ dynamic jet modeling, including blast wave effects, for new reactor design certification applications. The staff assesses the applicant’s procedures to be used to analyze all loads induced on neighboring