Document: NUREG-0800
Document ID: f4c03224-609e-4547-af34-a1bce151c0a4
Document Type: srp
Title: -8
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1233/ML12334A360.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
Draft Revision 3 – June 2013 motion, activation level, or release rate. The stiffness should be based on structural and hydraulic compliance, and the effects of temperature should be considered. The snubber end fitting clearance, mismatch of end fitting clearances, mismatch of activation and release rates, and lost motion should be minimized and should be considered when calculating snubber reaction loads and stress which are based on a linear analysis of the system or component. This is especially important in multiple snubber applications 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