ML17258A283
| ML17258A283 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 10/30/1981 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8111040159 | |
| Download: ML17258A283 (4) | |
Text
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ACCESSION>> NBR:Sf f 10401 SS DOC.DATEI: Sf/iO'/>0 NOTARIZED:: VO DOCKEiT' FACIL>>:50:"244 Robert" Efnwett>> Ginna>>>>uucl ear>> Pl antP Unit 1 i Rochester'>>
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'4)AI ER<, JI~ Er, Roche'ster Gas mI Electr>>ic Corp; REG Ip ~,VA>>HEI RECIPIENT AFF IL>>IAT'ION CRUTCHFIELO'iD.
Operating Reactors B'ranch.
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SUBJECIT:: Provides update>> to 810616 ltr re>> containment'urge>>'
vent" valves<Valves will~ rem@in close'd while>> plant's crit>>ical>>
until travel>> stops can>> be adjusted to" limit" vlavel opehdng.
angle to 40 degrees instead of 50 degre'es.
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~i ROCHESTER GAS AND ELECTRIC CORPORATION 0
S9 EAST AVENUE, ROCHESTER, N.Y. 14649 JOHN E.
MA IER VICE PRESIDENT TKLKPHONK ARKA COOK 7IK 546.2700 October 30, 1981 Director of Nuclear Reactor Regulation Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch No.
5 U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Containment Purge and Vent Valves R.
E. Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Crutchfield:
In a telephone conversation with a member of your staff, Mr. Richard Snaider, we were asked to provide an update of our activities regarding containment purge and vent valves.
Our previous letter on this subject, dated June 16, 1981 summarized interim actions being taken and schedules for future work.
These remain in effect, except as described below.
I On June 26; 1981,'e were notified by the containment purge valve manufacturer, Henry Pratt,, Inc., that plant specific analyses they had performed showed acceptable maximum valve opening angles of 30 to 50 The allowable opening angle for a given plant depended on the specific equipment and conditions in that plant.
Plant specific analyses have been performed for the Ginna valves by another consultant.
These analyses demonstrate acceptable valve closing using ASME service level D allowable stress criteria with the valves open to 50 when subjected to LOCA loadings.
- However, the valve may not be capable of being opened following closure.
If the valve opening is limited to 40
, the integrity is assured and all stresses are within ASME service level B or C criteria thus assuring the ability to reopen the valves.
To provide additional conservatism until final analyses and valve modifications are performed,'he valves are being maintained closed while the plant is critical until the travel stops can be adjusted to limit valve opening to 40 instead of 50 Very truly yours, alliO4>>~9 es>ohio DR ADOCK 05000244 PDR n
. Maser
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