Seismic damping factors of small bore piping as influenced by insulation and support elements

Journal Article · Wed May 01 04:00:00 EDT 1985 · J. Pressure Vessel Technol.; (United States)

DOI:https://doi.org/10.1115/1.3264426· OSTI ID:6310147

Severud, L K; Anderson, M J; Barta, D A

Seismic damping tests of a prototypical Liquid Metal Fast Breeder Reactor (LMFBR) small bore piping system is described, and measured transient responses to pulse excitations are reported. The test specimen was representative of a typical LMFBR insulated small bore piping system, and it was supported from a rigid test frame by prototypic dead weight supports, mechanical snubbers, and pipe clamps. Various support configurations were tested to assess the response sensitivity to insulation and other nonlinear support characteristics. Damping factors increased significantly due to the insulation and use of mechanical snubbers. Factors much higher than the magnitudes currently allowed in design by the USNRC Regulatory Guide 1.61, were found. This verified the design values, and it also pointed out the possibility of undue conservatism and costly overdesign resulting from use of the present design values.

• Research Organization: Engineering Analysis, Westinghouse Hanford Company, Richland, Wash.
• OSTI ID: 6310147
• Journal Information: J. Pressure Vessel Technol.; (United States), Journal Name: J. Pressure Vessel Technol.; (United States) Vol. 107:2; ISSN JPVTA
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210500* -- Power Reactors
Breeding
BREEDER REACTORS
CONTAINERS
DAMPING
DESIGN
DOCUMENT TYPES
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MECHANICAL STRUCTURES
NATIONAL ORGANIZATIONS
NONLINEAR PROBLEMS
PIPES
PRESSURE VESSELS
REACTORS
REGULATORY GUIDES
SEISMIC EFFECTS
SHOCK ABSORBERS
SUPPORTS
US NRC
US ORGANIZATIONS