ML20212H435

Proposed Tech Specs Re Util Request for Enforcement Discretion with Respect to TS 3/4.6.1.8 Re Drywell & Suppression Chamber Purge Sys

ML20212H435
Person / Time
Site:	Fermi
Issue date:	09/24/1999
From:	DETROIT EDISON CO.
To:
Shared Package
ML20212H433	List: ML20212H435 NRC-99-0092, Documents Util Request for Enforcement Discretion with Respect to Requirements of TS 3/4.6.1.8 Re Drywell & Suppression Chamber Purge Sys
References
NUDOCS 9910010128
Download: ML20212H435 (2)

Text

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ATTACHMENT TO

' ENCLOSURE 1 OF l

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NRC-99-0092 '

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CONTAllMENT SYSTEMS l

DRYWELL'AND SUPPRESSION CHAMBER PURGE SYSTEM LIMITING CONDITION FOR OPERATION 3.6.1,8 The drywell and suppression chamber purge system (6-inch,10-inch, 20-inch, and 24-inch valves

' isolation valves in one supp)l ay be in oN ration with the supply and exhaust line and one exhaust line open for inerting deinertino or pressure contro. Nitrogen VENTING / makeup and pressure control is also allowed through the 1-inch valves.

Purge f0TS shall be limited to 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> each 365 days.*/ vent operations through the APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

ACTION:

a.

With a drywell and suppression chamber purge system supply and/or exhaust isolation valve open, except as permitted above, close the valve (s) or otherwise isolate the penetration (s) within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in COLD L

SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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b..

With a drywell and suppression chamber purge system supply and/or exhaust isolation' valve (s) with resilient material seals having a l

measured leakage rate exceeding the limit of Specification restore the inoperable valve (si to OPERABLE status

~4.6.1.8.2, hours or be in at least HOT SHUiDOWN within the next 12 within 24

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hours and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.**

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SURVEILLANCE REQUIREMENTS 4.6.1.8.1 Before being o>ened for purge / vent operation through SGTS, the drywell and suppression ciamber purge supply and exhaust butterfly isolation valves shall be verified not to have been open for purge / vent operation j

through SGTS for more than 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> in the previous 365 days.*

4.6.1.8.2 At least once per 92 days each penetration for each 6-inch, each 10-inch, each 20-inch, and each 24-inch drywell and suppression chamber purge supply and exhaust isolation valve with resilient material seals shall be that the measured leakage rate is less than demonstratedOPERABLEbyverifylgedtoPa-i or equal to 0.05 La when pressur i

• Primary containment nitrogen VENTING and pressure control is permitted l

through the 1-inch valves and is not subject to the 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> per 365 day limit.

• • For Penetration X 26 inoperability'due to leakage exceeding the limit of

4.6.1.8.2, operation may continue until the next plant shutdown provided that the penetration is isolated via deactivated and closed valves T4800F407, with' flanged cover, and T4800F408 and that these valves are verified deactivated and closed every 31 days. For the purpose of this exception, Surveillance testing on T4800F407 and T4800F408 shall be deferred will be Atleastevery45 days,leaktestin$ueto

.until the next shutdown.

I performed to verify that the limit of 0.6 L is not exceeded additional penetration leakage. This testin will also qualitatively continue to verify the' integrity of outboar valves T4800F407 and T4800F408.

These requirements remain in effect until the isolation valve leakage is restored to within applicable limits. This leakage shall be restored to within applicable limits prior to startup from the next plant shutdown.

FERMI - UNIT 2-3/4 6-14 Amendment No. JS, j

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