ML19274C893
| ML19274C893 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 12/20/1978 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7901050246 | |
| Download: ML19274C893 (2) | |
Text
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<_ %g UNITED STATES y
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3, ' +4 NUCLEAR REGULATORY COT.P.11SSION f,
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REGION V O,,,
SUITE 202, W ALNUT CREEK PLAZ A k,
0' 1990 N. C ALIFORNf A BOULEVARD 9
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W ALNUT CREEK, C ALIFORNI A 94596 DEC 2 01978 Docket flo. 50-312 Sacramento f4unicipal Utility District P. O. Box 15830 Sacramento, California 95813 Attention: Mr. John J. flattimoe Assistant General llanager and Chief Engineer Gentlemen:
This refers to a meeting held by Messrs. Faulkenberry, Johnson and liiller of this office with Mr. Rodriguez and members of his staff at the Rancho Seco site on December 15, 1978, concerning actions you intend to take as a result of problems experienced and reported as part of your operational surveillance testing of Bergen-Paterson hydraulic snubbers on safety-related piping systems.
In this regard, it is our understanding that you are to take the following actions:
1.
Immediately following any seismic event having a magnitude of 0.19g or greater (as registered on Rancho Seco site instrumentation), you will functionally test for operability, including verification of proper piston movement, lockup and bleed, at least ten randomly selected Bergen-Paterson snubbers installed on safety-related piping systems.
2.
Immediately following any operat.,nal transient, which causes either physical damage to or significant movement of piping, you will functionally test for operability, including verification of proper piston movement, lockup and bleed, all Bergen-Paterson snubbers subjected to the transient conditions.
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DEC 2 0 B78 Sacramento Municipal Utility District -
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3.
You will initiate and pursue en a priority basis, with the Bergen-Paterson Company, a program aimed at determining appropriate additional corrective actions, including possible component re-design needed to prevent additional snubber failures resulting from poppet valve spring displacement and scoring of poppet valve seats.
If your understanding is not in accordance with that described above, please contact this office promptly.
Sincerely, h~,eA&~
R. H. Engelken Director cc:
R. J. Rodriguez