ML20095K568

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Proposed Tech Specs Re Increase of Drywell & Suppression Chamber Purge Sys Operating Time Limit from 90 H Each 365 Days to 180 H Each 365 Days
ML20095K568
Person / Time
Site: Limerick  Constellation icon.png
Issue date: 12/22/1995
From:
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20095K483 List:
References
NUDOCS 9512290093
Download: ML20095K568 (5)
v • d • e


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0 4-ATTACHMENT 2 UMERICK GENERATING STATION UNITS 1 AND 2 Docket Nos.

50-352 50453 License Nos.

NPF-39 NPF-85 TECHNICAL SPECIFICATIONS CHANGE REQUEST NO. 95-18-0 AFFECTED PAGES UNU 1 UNR 2 3/4 6-11 3/4 6-11 B 3/4 6-2 B 3/4 6-2

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9512290093 951222 PDR ADOCK 05000352 P PDR ,

3073/OD74U l .

P j CONTAINMENT SYSTEMS -

j _DRYWELL.AND SUPPRESSION CHAMBER PURGE SYSTEM e LIMITING CONDITION FOR' OPERATION '

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@f-3.6.1.8 T drywell and suppression chamber purge system may be in operation 1 g' o for up t

hours each 365 days with the supply and exhaust isolation valves in one supp y line and one exhaust line open for inerting, deinerting, or pressure control.*

APPLICA8ILITY: OPERATIONAL CONDITIONS 1, 2, and 3.

f ACTION:

} a. With a drywell and/or suppression chamber purge supply and/or exhaust isolation valve open,-except as permitted above, close the valve (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 /> j 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 />.

J SURVEILLANCE REQUIREMENTS 4.6.1.8 Before being opened, the drywel1 and suppression chamber purge supply and exhaust bu erfly isolation valves shall be verified not to'have been open for more than ours in the previous 365 days.*

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  • Valves open for pressure control are not subject to the hour per 365 day limit provided the 1-inch /2-inch bypass line is being ut ized.

4 LIMERICK - UNIT 1 3/4 6-11 A1)$ BM

. . l CONTAINMENT SYSTEMS-BASES 3/4.6.1.5 PRIMARY CONTAINMENT STRUCTURAL INTEGRITY will ce maintained tne unit. Structura!

comparacle to the original design e life of stancar witnstand t.*e maximum crassure of 44.02 esig in ene a LOCA.

event ofintegrity is !

tnis capability. inspection in conjunction witn Type A leakageA tests visual is sufficie 3/4.6.1.6 ORYVELL AND SUPPRESSION CHAM 8ER INTERNAL PRESSURE The limitations on drywell and suppression chameer internal pressure ensure that the contairment peak pressure of 44.02 psig doer not exceed the cesign pressure of 55 psig during LOCA conditions or that the external pressure ciffer-ential 5.0 does not exceed the design maximum external pressure differential of psid.

The limit of - 1.0 to + 2.0 psig for initial containment pressure will limit the total pressure to 44.02 psig which is less than the design l pressure and is consistent with the safety analysis.

3/4.6.1.7 ORYWELL AVERAGE AIR TEMPERATURE The limitation on drywell average air temperature ensures that the con-tainment peak air temperature does not exceed the design temperature of 340'F during steam line break conditions and is consistant with the safety analysis.

3/4.6.1.8 ORYWELL AND SUPPRESSION CHAMBER PURGE SYSTEM 66@DmDES Ao siidoW5 The drywell and suppression chamber purge supply a exhaust isolation valves are required to be closed during plant oper t except as required for inerting, deinerting and pressure control. The ours per 365 day limit on purge valve operation is imposed to protect the integrity of the SGTS filters.

Analysis indicates that should a LOCA occur while this pathway is ceing utilizac .

affect the integrity of SGTS.the associated pressure surge through the (18 or 2 valves when pressure control is being performed througn the 2-inch since a pressure surge through this line does not threaten the OPERABILITY of SGTS.

t LIMERICX - UNIT 1 B 3/4 6-2 Amendment No.29 lill 3 z !!ag

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, CONTAIMENT SYSTEMS DRWELL AND SUPPRESSION CHAMBER PURGE SYSTEM LINITING CONDITION FOR OPERATION j 3.6.1.8 _ drywell and suppression chamber purge systes may be in operation j for up t hours each 365 days with the supply and exhaust isolation valves

in one supp y line and one exhaust line open for inerting, deinerting, or
pressure control."
APPLICABILITY
OPERATIONAL CONDITIONS 1, 2, and 3.

) ACTION:

! a. With a drywell and/or suppression chamber purge supply and/or exhaust l - isolation valve opent except as permitted above, close the valve (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 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 I

4. 6.1. 8 Before being opened, the dr>well and suppression chamber purge supply and exhaust bu tarfly isolation valves shall be verified not to have been open

, for more than hours ih the previous 365 days.*

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" Valves open for pressure control are not subject to the ur per 365 day limit provided the 1-inch /2-inch bypass line is being utilized.

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LIMERICK - UNIT 2 3/4 6-11 -

AU6 2 51989

. _ _ _ _ _ _ _ - --a- ___ _ _ _ _ . _ _ . _ _ . _ . . _ _ . _ _ . _ _ - _ _ _ _ _ _ _ . _ _mm___ __m__ -- _ _ -_ _ _ __________-___-_---_r - _ _ - _ - - _ _ -

'C0hTAINMENTSYSTEMS BASES 3/4.6.1.5 PRIMARY CONTAINMENT STRUCTURAL INTEGRITY This limitation ensures that the structural integrity of the containment will be maintained comparable to the original design standards for the life of the unit. Structural integrity is required to ensure that the containment will withstand the maximum calculated pressure in the event of a LOCA. A visual l inspection in conjunction with Type A leakage tests is sufficient to demonstrate this capability.

3/4.6.1.6 DRYWELL AND SUPPRESSION CHAMBER INTERNAL PRESSURE The limitations on drywell and suppression chamber internal pressure ensure that the calculated containment peak pressure does not exceed the design l pressure of 55 psig during LOCA conditions or that the external pressure differ-ential does not exceed the design maximum external pressure differential of 5.0 psid. The limit of - 1.0 to + 2.0 psig for initial containment pressure will limit the total pressure to s 44 psig which is less than the design l pressure and is consistent with the safety analysis.

I 3/4.6.1.7 DRYWELL AVERAGE AIR TEMPERATURE The limitation on drywell average air temperature ensures that the con-tainment peak air temperature does not exceed the design temperature of 340 F during steam line break conditions and is consistent with the safety analysis.

CC 3/4.6.1.8 DRYWELL AND SUPPRESSION CHAMBER PURGE SYSTEM ko fc0_

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The drywell and suppression chamber purge supply nd exhaust isolation valves are required to be closed during plant op at n except as required for inerting, deinerting and pressure control. The ours per 365 day limit on purge valve operation is imposed to protect the integrity of the SGTS filters.

Analysis indicates that should a LOCA occur while this pathway is being utilized,

. the associated pressure surge through the (18 or 24") purge lines will adversely affect the integrity of SGTS. This limit is not imposed, however, on the subject valves when pressure control is being performed through the 2-inch bypass line,

since a pressure surge through this line does not threaten the OPERABILITY of SGTS.

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l LIMERICK - UNIT 2 B 3/4 6-2 Amendment No. 51 FEB 1 61995

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