Document: NUREG-0800
Document ID: dde0532e-72c1-431c-9bbd-1062bb913da3
Document Type: srp
Title: -8
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1404/ML14043A231.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
Revision 3 – April 2014 where mismatch of end fitting clearance has a greater effect on the load sharing of these snubbers than does the mismatch of activation level or release rate. Equal load sharing of multiple snubber supports should not be assumed if mismatch in end fitting clearance exists. (iii) Design Specifications. The required structural and mechanical performance of snubbers is determined from the applicant's structural analysis described in Subsections II.3.B(i) and (ii). The snubber Design Specification is the instrument provided by the purchaser to the supplier to ensure that the requirements are met. The Design Specification should contain: (1) The general functional requirements, (2) Operating environment, (3) Applicable codes and standards, (4) Materials of construction and standards for hydraulic fluids and lubricants, (5) Environmental, structural, and performance design verification tests, including the required dynamic qualification, testing and extrapolation methods supporting qualification of large bore hydraulic snubbers with rated load capacities of 50 Kips or more as recommended in NUREG/CR-5416. (6) Production unit functional verification tests and certification, (7) Packaging, shipping, handling, and storage requirements, and (8) Description of provisions for attachments and installation. In addition, the procurement program should include provisions for the snubber manufacturer to submit quality assurance and assembly quality control procedures for review and acceptance by the purchaser. (iv) Use of Additional Snubbers. Snubbers could in some instances be installed during or after plant construction. These snubbers may not have been included in the design analysis. This could occur as a result of unanticipated piping vibration, as discussed in SRP Section 3.9.2, or interference problems during construction. The effects of such snubbers should be fully evaluated and documented to demonstrate that normal plant operations and safety are