ML19257C369
| ML19257C369 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Quad Cities  |
| Issue date: | 01/11/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8001280495 | |
| Download: ML19257C369 (1) | |
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UNITED STATES E
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NUCLEAR REGULATORY COMMISSION E
REGION lli o,
799 ROOSEVELT ROAD
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GLEN ELLYN, ILLINOIS 60137 DAN 11 1?: '
Docket Nos. 50-10, 50-237, 50-249 50-254 and 50-265 Commonwealth Edison Company ATTN:
Mr. Cordell Reed Vice President P. O. Box 767 Chicago, IL 60690 Gentlemen:
Enclosed is IE Bulletin No. 80-01 which requires action by you with regard to your BWR power reactor facilities with an operating license.
Should you have questions regarding this Bulletin or the actions required of you, please contact this office.
Sincerely, S
(/ James G. Keppler Director
Enclosure:
IE Bulletin No. 80-01 cc w/ encl:
Mr. D. L. Peoples, Director of Nuclear Licensing Mr. B. B. Stephenson, Station Superintendent Mr. N. Kalivianakis, Plant Superintendent Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Mr. Dean Hansell, Office of Assistant Attorney General 1819 239 s
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UNITED STATES SSINS No.:
6870 NUCLEAR REGULATORY COMMISSION Accession. No.:
OFFICE 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 informed by Philadelphia Electric Company that engineering evaluation for Peach Bottom 2 and 3 has disclosed that the Automatic Depressurization System (ADS) pneumatic 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 pneumatic supply in a seismic event.
Attached is a simplified schematic of the pneumatic supply. lne check valve 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 supply inside the drywell, but seismic qualification has not been verified. The licensee has stated that the pneumatic supply is not seismically gaalified 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 srpply 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 system from the pneumatic supply system.
2.
Determine if periodic leak tests have been performed on your ADS accumulator systems to assure emergency pneumatic supply for the FSAR-required number and duration of valve operations.
3.
Review seismic qualifications of the ADS pneumatic supply system:
(a) from accumulator system isolation check valve to ADS valve operator, (b) from isf.ation valve outside containment up to ADS accumulator check valve.
4.
Based upon determination of ite DUPLICATE DOCUMENT of the ADS for the conditions u including a seismic event.
If Entire document previously to appropriate Technical Specifi entered into system under:
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