ML19208B232
| ML19208B232 | |
| Person / Time | |
|---|---|
| Site: | 05000516, 05000517, Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 09/10/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Wofford A LONG ISLAND LIGHTING CO. |
| References | |
| NUDOCS 7909190383 | |
| Download: ML19208B232 (1) | |
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g7 UNITED STATES
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'i NUCLEAR REGULATORY COMMISSION
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,o KING OF PRUSSIA, PENNSYLVANIA 19406 Docket Nos. 50-322 50-516 SEP107973 50-517 Long Island Lighting Company ATTN:
Mr. Andrew W. Wofford Vice President 175 East Old Country Road Hicksville, New York 11801 Gentlemen:
The enclosed Circular No. 79-18 is forwarded to you for information.
No written response is required.
Should you have any questions related to your understanding of the recommendations on this matter, please contact this office.
Sincerely, T Wu W.
n Boyce H. Grier Director
Enclosures:
1.
iE Circular No. 79-18 2.
'ist of IE Circulars Issued in Last Six Months cc w/encls:
J. P. Novarro, Project Manager Edward M. Barrett, Esquire Edward J. Walsh, Esquire T. F. Gerecke, Manager, Er gineering QA Department D (,fj Obs
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ENCLOSURE 1 Accession No: 7908200385 SSINS No. 6830 UNITED STATES-NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Circular No. 79-;8 x
Date:
Septamber 10, 1979 Page 1 of 2 PROPER INSTALLATION OF TARGET ROCK SAFETY-RELIEF VALVES Description of Circumstances:
As a result of NRC monitoring of operating experiences involving the Target Rock safety-relief valve, two potential problems have been icentified.
One pctential problem is that the performance of the valve has been found to be impaired by either excessive or insufficierit insulation around the valve body when installed in its service environment.
The other potential problem is that improper assembly of the modified valve can result in inoperability of the remote air actuator.
The Target Rock safety-relief valve is a dual purpose valve in that overpressure response is provided by pilot valve action and automatic depressurization (ADS) is provided by a remote air cctuator.
Valve operation has been towd to be affected by the amount of insulation placed around the valve body.
A previous IE Bulletin No. 76-06 was isseed on July 21, 1976 as a result of operating experiences where excessive insulation was installed on the valve.
The excessive insulation caused excessive heat to be retained producing a higher temperature environ: cent for the elastomeric diaphragm which resulted in accelerated deterioration of the elastomer. Failure of the elastomeric diaphragm, makes the valve inoperaele in the power-operation mode (i.e. manual and A05).
Subsequently, a silicone-nomex diaphragm was developed by the manefacturer to provide a longer life in high temperature environments.
In additinn, 'the M Bulletii, explicitly required that insulation be installed in ac h.* dance wi n the manufacturer's recommendations.
A recent licensee event report from the r'oi.ticello facility identified'a potential problem resulting from insufficient insulation (i.e. just opposite of the condition address 6d by IE Bulletin 76-06).
During t. e performance of special testing,of the response to safety ralief valve operation, a valte was discovered to be exceeding its design delay time for opening.
Subsequerf inspection and testing of the valve reveal,ed that insufficient insulatior: may cause condensation to accumulate in the results in-deleying the opening of the m lDUPLICATEDOCUMENT lEntire document previonel.y entered
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