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
CFR Part: 
CFR Title: 

Content:
ation application concerning its dynamic jet load modeling on a case by case basis. 1 Knowledge Base for Emergency Core Cooling System Recirculation Reliability, February 1996, issued by the NEA/CSNI, http://www.nea.fr/html/nsd/docs/1995/csni-r1995-11.pdf. 2 These feedback phenomena have been described for aircraft that use jets to lift off and land vertically (see, for example Ho, C.M., and Nosseir, N.S., Dynamics of an impinging jet. Part 1, The feedback phenomenon, Journal of Fluid Mechanics, Vol. 105, pp.119-142, 1981). 3 For example, Ho and Nosseir show a factor of 2-3 increase in pressure fluctuations at the frequency of the resonance, but this has not been shown to be a limiting value. 3.6.2-17 Revision 3 – December 2016 As described in this SRP section, the applicant 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