ML20211P947

Revised MSRV Tailpipe Temp Action Plan

ML20211P947
Person / Time
Site:	Limerick
Issue date:	10/15/1997
From:	PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20211P942	List: ML20211P938 ML20211P947
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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