Closeout of IE Bulletin 79-04: incorrect weights for swing check valves manufactured by Velan Engineering Corporation

IE Bulletin 79-04 was issued March 30, 1979 as a result of reports from three facilities that Velan Engineering Corporation had provided incorrect weights for swing check valves. The reason for concern was the possibility that these incorrect weights had been used in analyses of Seismic Category I piping systems at a large number of plants. Evaluation of utility responses and NRC/IE inspection reports shows that the bulletin can be closed out for 117 (92%) of the 127 current facilities on the basis of specific criteria. Followup items for the remaining 10 current facilities are proposed for use by NRC/IE. Incorrect weights reported for valves other than Velan swing check valves are identified as Remaining Areas of Concern. This bulletin has served its purpose and can be closed out. A final check of valve weights will be made per later IE Bulletin 79-14 on seismic analyses for as-built safety-related piping systems