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:
duced to an acceptable level. If no snubber piston travel is measured at those stations indicated in d., above, a description should be provided of the corrective action to be taken to assure that the snubber is operable. 2. To meet the relevant requirements of GDC 2, the acceptance criteria for the areas of review described in subsection I.2 of this SRP section are given below. Other approaches which can be justified to be equivalent to or more conservative than the stated acceptance criteria may be used to confirm the ability of all seismic Category I systems, components, equipment, and their supports to function as needed during and after an earthquake. a. Seismic Analysis Methods The seismic analysis of all Category I systems, components, equip- ment, and their supports (including supports for conduit and cable trays and ventilation ducts) should utilize either a suitable dynamic analysis method or an equivalent static load method, if justified. (1) Dynamic Analysis Method A dynamic analysis (e.g., response spectrum method, time history method, etc.) should be used when the use of the equivalent static load method cannot be justified. To be acceptable such analyses should consider the following items: (a) Use of either the time history method or the response spectrum method. (b) Use of an adequate number of masses or degrees of freedom in dynamic modeling to determine the response of all Category I and applicable non-Category I systems and plant equipment. The number is considered adequate when addi- tional degrees of freedom do not result in more than a 10% increase in responses. Alternately, the number of degrees of freedom may be taken equal to twice the number of modes withr frequencies less than 33 hz. (c) Investigation of a sufficient number of modes to assure participation-of all significant modes. The criterion for sufficiency is that the inclusion of additional modes does not result in more than a 10% increase in responses. 3.9.2-6 Rev. 2 - July 1981