Evaluation of Scale-Model Methods for Operability Qualification of Seismic Category I Pumps and Valves.

摘要

Seismic qualification of some critical equipment for nuclear power plants can have a significant impact on design.. 'Operability'requirements for large pumps and valves as defined in the NRC Regulatory Guide 1.48do not provide specifics on the seismic qualification approach. Justification of a specific approach remains the responsibility of the manufacturer who is faced with limitations in testing facilities and scale-modeling requirements. The objective of this report (RP398-1) is to determine the extent to which scale-model testing can be used to simulate the seismic response of category I pumps and valves. The scope of the study included: a literature search to determine existing technology on scale-model testing,the evaluation of critical operability parameters and associated testing,the evaluation of scaling laws applicable to operability testing,and associated manufacturing and testing costs. The results generated may provide useful background information for anyone contemplating scale-model tests during the qualification process. However,the study identified several limitations of scaling techniques and test capabilities that need to be resolved before an extensive model test program can be justified.