ML19257C368
| ML19257C368 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 01/14/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Groce R VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 8001280494 | |
| Download: ML19257C368 (1) | |
Text
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NUCLEAR REGULATORY COMMISSION 3 g%d'i ' - [
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KING OF PRUSSIA, PENNSYLVANIA 19406 Docket No. 50-271 fg 1( g Vermont Yankee Nuclear Power Corporation ATTN:
Mr. Robert H. Groce Licensing Engineer 20 Turnpike Road Westborough, Massachusetts 01581 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,
[
Boyce H. Grier Director
Enclosures:
1.
IE Bulletin No. 80-01 with Attachment 2.
List of Recently Issued IE Bulletins CONTACT:
E. C. McCabe, Jr.
(215-337-5251) cc w/encls:
W. F. Conway, Plant Superintendent Ms. J. Abbey, Technical Secretary 1819 237 001280 49y 8
ENCLOSURE 1 UNITED STATES SSINS No.:
6870 NUCLEAR REGULATORY COMMISSION Accessions No.:
OFFICE OF INSPECTION AND ENFORCEMENT 7912190652 WASHINGTON, D.C. 20555 IE Bulletin No. 80-01 Date: January 14, 1980 Page 1 of 2 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 tre 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.
The 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 sepports 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 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.
Detero"ne if your facility has installed hard-seat check valves to isolate the AOS 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 qualifi-ations of the ADS pneumatic supply system:
(a) from accumulatar system isolation check valve to ADS valve operator, (b) from isolation valve outsi valve.
DUPLICATE DOCUMENT 4.
Based upon determination of ite of the ADS for the conditions u Entire document previously including a seismic event.
If entered into system under:
to appropriate Technical Specif pg Q
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