Document: NUREG-0800
Document ID: 1f106a50-722f-45fa-952a-2e7ab7d836c1
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, COMPONENTS, AND EQUIPMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052360453.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
bration tests. The inspection program description should include the areas subject to inspection, the methods of inspection, the design access provisions to the reactor internals, and the equipment to be used for performing such inspections. These inspections should be conducted preferably following the removal of 3.9.2-13 Rev. 2 - July 1981 the internals from the reactor vessel. Where removal is not feas- ible, the inspections should be performed by means of equipment appropriate for in situ inspection. The areas inspected should include all load-bearing interfaces, core restraint devices, high stress locations, and locations critical to safety functions. For internals of subsequent reactors that have the same design, size, con- figuration, and operating conditions as the prototype reactor internals, the vibration test program should conform to the requirements of the appro- priate nonprototype program as specified in Regulatory Guide 1.20. 5. Relevant requirements of GDC 2 and 4 are met as given below. Dynamic system analyses should be performed to confirm the structural design ade- quacy of the reactor internals and the reactor coolant piping (unbroken loops) to withstand the dynamic loadings of the most severe LOCA in com- bination with the SSE. Where a substantial separation between the forcing frequencies of the LOCA (or SSE) loading and the natural frequencies of. the internal structures can be demonstrated, the analysis may treat the loadings statically. The most severe dynamic effects from LOCA loadings are generally found to result from a postulated double-ended rupture of a primary coolant loop near a reactor vessel inlet or outlet nozzle with the reactor in the most critical normal operating mode. However, all other postulated break loca- tions should be evaluated and the location producing the controlling effects should be identified. Mathematical models used for dynamic system analysis for LOCA in combination with the SSE effects should include the