ML20211P947
| ML20211P947 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 10/15/1997 |
| From: | PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| Shared Package | |
| ML20211P942 | List: |
| References | |
| PROC-971015, NUDOCS 9710220035 | |
| Download: ML20211P947 (1) | |
Text
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2 1 Attachment -
Docket Hos. 50 352 and 50-353 October 15,1997
- Page _1 Limerick Generatina Station. 'Inits 1 and 2 Revised Main Steam Relief Valve (MSRV5 Tailoice Temperature Action Plan For any MSRV > 235 degrees F (Alert Level)
Operations shall log the affected MSRV tailpipe temperature every 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> while operating at power (and every six hours rturing startup).
i A determination shall be made if the leakage is a main valve or a pilot valve lerk by the next day based on pilot temperature changes or other behavior of the leakage. Pilot
- valve leakage will be assumed if the cause is indeterminate.
>240 degrees F_(Action Level):
Engineering shall perform an assessment of the cause of leakage and evaluate setpoint operability by the next day (if pilot leakage or indeterminate).
Engineering shall begin trend;ng plant parameters to determine MSRV input to the suppression pool. Leakage shall be neitored and trended. Plant management shall -
be updated on status weekly.
At 200 lbnihr, the MSRV will be considered inoperable for setpoint actuated function
- at the required 1% setpoint tolerance.
Engineering shall project when the affected MSRV leakage will increase to 200, 500,
^
and 1000 lbm/hr based on current and previous temperaare trends or other exponence.-
. At 500 lbm/hr leakage rate, Outage Management shall schedule an outage to replace
' the affected MSRV prior to a leakage of 1000 lbm/hr.
Technical Basis and Discussion of Margins 235 degrees F - Leakage is above expected value but very low relative to operability concems.
240 degrees F - Leakage is below 100 lbm/hr design value and margin exists relative to
. operability concems.
200 lbm/hr-1% Setpoint tolerance confidence is reduced and setpoint operability cannot be assured. Remote actuation is assured. Margin exists to an inadvertent opening concem.
500 lbm/hr-Leakage is abnormally high. Outage scheduling is warranted to avoid a
- forced shutdown. Remote actuation is assured. Margin exists to prevent inadvertent opening.
1000 lbm/hr-Margin to inadvertent opening is reduced such that continued operation is not justified.
9710220035 971015 PDR ADOCK 05000352 P.
PDR;,
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