ML18079A177
| ML18079A177 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 04/24/1979 |
| From: | Mittl R Public Service Enterprise Group |
| To: | Parr O Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7904300265 | |
| Download: ML18079A177 (2) | |
Text
Public Service Electric and Gas Company 80 Park Place Newark. N.J. 07101 Phone 201 /430-7000 April 24, 1979 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D. c.
20555 Attention:
Gentlemen:
Mr. Olan D. Parr, Chief Light Water Reactors Branch 3 Division of Project Management VALVE WEIGHTS USED IN SEISMIC ANALYSIS NO. 1 AND 2 UNITS SALEM NUCLEAR GENERATING STATION DOCKET NOS. 50-272 AND 50-Jil On March 13; 1979, the Nuclear Regulatory Commission issued orders to licensees for five power reactors to shut down within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> and to show cause why they should not remain shut down pending re-analysis of certain safety-related piping systems and pending completion of any modifications indicated by the re-analysis.
This action was based on the discovery of a potentially unconservative calculation technique within a computer program that had been used by the architect-engineer for analysis of certain piping systems.
Pursuant to the above action, PSE&G was requested by Region I of the NRC's Office of Inspection and Enforcement to provide in-formation relative to the PSE&G Engineering stress calculation basis for the seismic design of the Safety Injection System at Salem.
Specifically involved were the weight characteristics employed in the seismic stress calculations of 6" safety injection piping which included 6" swing check valves manufactured by Velan Engineering Company.
7904300~~
The Energy People 95-2001 (400MJ 9-77 J
l Mr. Olan D. Parr, Chief April 16, 1979 Page 2 Our investigation indicated that during the engineering review of manufacturerts drawings prior to performing the seismic pipe stress calculations in 1975, PSE&G questioned the manufacturer's specified weight of 1500 psi 3" Velan swing check valve listed as 60 lbs.
Velan Engineering provided PSE&G with corrected weights for their 3", 4" and 6" swing check valves of 200, 325, and 450 lbs., respectively.
The stress calculations both for the No. l and 2 Unit safety injection piping was performed using these weight values.
Should you have any further questions in this regard, do not hesitate to contact us.
Very truly yours,
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R. L. Mittl General Manager -
Licensing and Environment Engineering and Construction