ML19322D237
| ML19322D237 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse, Oconee, Arkansas Nuclear, Crystal River, Rancho Seco, Crane  |
| Issue date: | 05/07/1979 |
| From: | Fairburn G BABCOCK & WILCOX CO. |
| To: | BABCOCK & WILCOX CO. |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8002100080 | |
| Download: ML19322D237 (3) | |
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'THE BABC0CK & WILCOX C0tMANY 3
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DISTRIBUTIO.'t, %(, 7,9, 9, //, M DISTRIBUTION From RA:,al'UNdt:. wgD FROM J,_%.E@ 3. 9.// !E 1
G. T. FAIRBURN, SERVICE MANAGER gg g,g g
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DUKE POWER COMPANY, METROPOLITAN EDISON COMPAN, Fi l e No. NSS-3,4,5,7,5,~9,~
FLORIDA POWER CORP., AP&L. SMUD & TECO 11 & 14 /T3.35 Su bj.
OPERATING INSTRUCTIONS FOR SYMPT 0MS OF 'A STUCK OPEN Date POWER OPERATED RELIEF VALVE MAY 7,1979 jm.....,,................,...............%
DISTRIBUTION CD Russell RC Luken JT Janis GT Fairburn The attached infomation has been reviewed and approved for transmittal to your customer.
Please forward this information to your customer as soon as possible.
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GTF/hh Attachment cc: GJ Brazill JH Taylor CE Mahaney EJ Domaleski REVIEYED FOR ACCU;iACY DC Uinterich
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1.
INTRODUCTION Item 3 of IE Bulletin No. 79-05 requests utilities with B&W supplied NSS systems to review the actions required for coping with transients. This IE bulletiri 'was prompted by the nuclear incident at Three Mile Island.
During this incident, the power operated relief valve (PORV) on the pressurizer opened and failed to reclose.
Considerable time passed before the operator determined that the PORV had failed open and took corrective action to isolate the valve. Operating and emergency procedures should be reviewed and revised.as necessary to minimize the potential for a similar event.
To support this effort, infomation relative to symptoms of a stuck open PORV is provided below for your consideration.
2.
DESIGN FUNCTION OF THE PORV Overpressure protection of the RCS is provided by two code safety valves on the pressurizer. The ASME code requires that these valves cannot be isolated.
Prudent operation of these valves dictates minimizing the number of times the code safety valves will be opened.
This is accom-plished by providing a PORV with a lower opening setpoint.
3.
SYMPTOMS OF A STUCX OPEN PORV (see note (1) below)
A.
RC pressure below the reset pressure of the PORV and decreasing (primary symptom) with a.
Pressurizer level increasing or indicated high (opposite trend may be possible under certain conditions).
b.
Primary coolant temperature approaching saturation.
B.
Increase in the RC Drain tank level, pressure, and/or temperature.
C.
Sustained high (T/C) temperature dowa. stream of the PORV.
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(1) The PORV position indicator lights do not provide direct status of the valve cosition.
The licht indicates the position of U.a soicaaid cperator cr. tae iv7i.
Ti3erefore, the indicator lights might not indicate a stuck open PORV.
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