ML19340C363
| ML19340C363 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 10/31/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Rich Smith VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 8011140622 | |
| Download: ML19340C363 (1) | |
Text
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o UNITED STATES
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NUCLEAR REGULATORY COMMISSION "n y, l
REGION l 0, W g
631 PARK AVENUE
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,o' KINO oF PRUSSIA, PENNSYLVANIA 19406 3
g October 31, 1980
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Docket No. 50-271 Vermont Yankee Nuclear Power Corporation
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ATTN:
Mr. Robert L. Smith 1..
Licensing Engineer M
~:4 25 Research Drive C
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Westborough, Massachusetts 01581
'o Gentlemen:
The enclosed IE Information Notice No. 80-39, " Malfunctions of Solenoid Valves Manufactured by Valcor Engineering Corporation," is forwarded to you for information.
No written response is required.
If you desire additional information regarding this mattar, please contact this office.
Sincarely, So e H. Gria,r Director
Enclosures:
1.
IE Information Notice No. 80-39 2.
List of Recantly Issued IE Information Notices CONTACT:
D. L. Caphton (215-337-5265) cc w/encis:
Mr. Warren P. Murphy, Plant Superintendent Mr. W. F. Conway, Vice President and Manager of Operations Mr. J. E. Griffin, President Mr. L. H. Heider, Vice President g()} } } 49 b
SSINS NJ.:
6835 Accession No.:
1 8008220245 IN 80-39 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C. 20555 October 31, 1980 IE INFORMATION NOTICE N0. 80-3:: MALFUNCTION OF SOLENOID VALVES MANUFACTlJRED BY VALCOR ENGINEERING CORPORATION PURPOSE:
N: intent of this Information Notice is to alert holders of construction permits and operating licenses for nuclear power plants of a potentially generic prcblem involving the malfunctioning of certain solenoid valves manu-factured by the Valcor Engineering Corporation (Valcor).
The solenoid valves so involved are designated as Valcar Valve Model Nc. V52500-554-1.
Valcor has informed us that these valves have only been supplied to the McGuire facility; however, since these valves were substituted for scienoid valves of another manufacturer that did not meet the requirements of IE Bulletin.No. 79-01 and its amendments, licensees and holdet of construction permits should take into account the problem identified in this Information Notice prior to making any similar substitution.
SA0XGROUND:
By TWX dated June 27, 1980, Valcor submitted a preliminary 10 CFR Part 21 Report addressing the malfunctioning of Vaicor solenoid valves at the McGuire facility.
The malfunctioning valves have been identified as Valcor Valve Model No. 52300-554-1.
This TWX was subsequently followed by a letter dated July 3,1980, transmitting a more detailed Part 21 Report entitled," Quality Assurance Report", a copy of which is attacned hereto as Enclosure No. 1.
In brief, the malfunction appears to be an intermittent type wherein the valve fails to cycle from OPEN to CLOSE to CPEN immediately after a sustained period of operation in the energized (OPEN) mode.
Although the valves are rated for
" continuous operation", Valcar contands that the valves were not designed to meet the operating conditions requiring the immediate cycling from GPEN to CLOSE to OPEN after a sustained period of continuous energi:ation.
A major source of the problem, therefore, may be a misunderstanding of the term
" continuous operation".
By letter dated July 14, 1980 to Duke Power Company, Valcor transmitted its recommendations in this matter entitled, " Outline -
Suggested Modification Procedures", a copy of which is attachea hereto as Enclosure No. 2.
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