ML19257C353
| ML19257C353 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 01/11/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8001280479 | |
| Download: ML19257C353 (1) | |
Text
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WALNUT CREE K, CALIFORNIA 94596 January 11, 1980 Docket No. 50-133 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention: Mr. Philip A. Crane, Jr.
Assistant General Counsel Gentlemen:
Enclosed is IE Bulletin No. 80-01 which requires action by you with regard to your BWR power reactor facility with an operating license.
Should you have questions regarding this Bulletin or the actions required of you, please contact this office.
Sincerely, l?$V Q Q'-
R. H. Engelken Director
Enclosures:
1.
List of Recently Issued IE Bulletins cc w/ enclosures:
W. Barr, PG&E W. A. Raymond, PG&E E. Weeks, PG&E, Humboldt Bay 1819 134 g
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UNITED STATES SSINS No.: 6870 NUCLEAR REGULATORY C0fNISSION Accessions No.:
0FFICE OF INSPECTION AND ENFORCEMENT 7912190652 WASHINGTON, D.C. 20555 January 11, 1980 IE Bulletin No. 80-01 OPERABILITY OF ADS VALVE PNEUMATIC SUPPLY On January 10, 1980, the NRC was inforced by Philadelphia Electric Company that engineering evaluation for Peach Bottom 2 and 3 has disclosed that the Automatic Depressurization Systen (ADS) pneunatic supply (either nitrogen or air) may not be operable for all possible events because of a combination of misapplication of check valve, a lack of leak testing of the accumulator system backing up each ADS valve operator and questions about the continued operability of the pneunatic supoly in a seismic event. Attached is a simplified schematic of the pneumatic supply. The check val-ve nearest to the accumulator is a PAL, three-quarter inch, stainless steel, socket welded check valve with a hard seat (valve identification-B-1376 on the upper flange). Plant information at Peach Bottom shows substantial supports for the pneumatic suoply inside the drywell, but seismic qualification has not been verified. The licensee has stated that the pneumatic supply is not seismically qualified outside the drywell.
Unit 2 was shutdown on 1/10/80 because of questions of ADS operability and Unit 3 has been provided a seismically qualified nitrogen supply at the containment penetration pending confirmation of seismic qualification of piping inside Unit 2 containment. The licensee is changing their valve to one with a soft seat to reduce leakage.
Actions to be taken by Licensees of GE BWR facilities with an operating license which use a pneumatic operator for ADS function:
1.
Determine if your facility has installed hard-seat check valves to isolate the ADS accumlator systen from the pneumatic supply system.
2.
Determine if periodic leak tests have been perfomed on your ADS accumulator systems to assure energency pneumatic supply for the FSAR-required number and duration of valve operations.
3.
Review seismic qualifications of the ADS pneumatic suoply system:
(a) from accumulator system isolation check valve to ADS valve operator, (b) from isolation valve outside valve.
4.
Based upon determination of itens g DUPLICATE DOCUMENT of the ADS for the conditions und including a seismic event.
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