Document: NUREG-0800
Document ID: 7c104096-d040-463a-a94b-a0af08ab3478
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, STRUCTURES, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0702/ML070230008.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
be measured). F. If vibration is noted beyond the acceptance levels set by the criteria of Item II.1.C above, corrective restraints should be designed, incorporated in the piping system analysis, and installed. If, during the test, piping system restraints are determined to be inadequate or are damaged, corrective restraints should be installed and another test should determine whether the vibrations have been reduced to an acceptable level. If no snubber piston travel is measured at those stations indicated in Item II.1.D of the acceptance criteria, the corrective action to be taken to ensure that the snubber is operable should be described. 2. To meet the requirements of GDC 2, 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 as equivalent to or more conservative than the stated acceptance criteria may be used to confirm the ability of all Seismic Category I systems and components 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, equipment, 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. 3.9.2-11 Revision 3 - March 2007 (i) 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: (1) Use of either the time history or the response spectrum method. (2) 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 adequate when additional degrees of freedom do not result in more than