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:
r should be remotely located with regard to the seismic Category I piping system. If it is not feasible or practical to isolate the Category I piping sys- tem, adjacent non-Category I piping should be analyzed according to the same seismic criteria as applicable to the Category I piping system. For non-Category I piping systems attached to Category I piping systems, the dynamic effects of the non- Category I piping should be simulated in the modeling of the Category I piping. The attached non-Category I piping, up to the first anchor beyond the interface, should also be designed in such a manner that during an earthquake of SSE intensity it will not cause a failure of the Category I piping. 1. Criteria Used for Damping Regulatory Guide 1.61 (Reference 9) "Damping Values for Seismic Design of Nuclear Power Plants," provides acceptable values which may be used. The use of alternate damping values requires justification. 3. Relevant requirements of GOC 1 and 4 are met as given below. The follow- ing guidelines, in addition to Regulatory Guide 1.20 (Reference 7), apply to the analytical solutions to predict vibrations of reactor internals for prototype plants. Generally, this analysis is required only for pro- totype designs. a. The results of vibration calculations for a prototype reactor should consist of the following: (1) Dynamic responses to operating transients at critical locations of the internal structures should be determined and, in particu- lar, at the locations where vibration sensors will be mounted on the reactor internals. For each location, the maximum response, the modal contribution to the total response, and the response causing the maximum stress amplitude should be calculated. 3.9.2-11 Rev. 2 - July 1981 (2) The dynamic properties of internal structures, including the natural frequencies, the dominant mode shapes, and the damping factors should be characterized. If analyses are performed on a component structural element basis, the existence of