ML20137G675

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Proposed Tech Specs Deleting Drywell & Suppression Chamber Purge Sys Operational Time Limit & Add SR to Ensure Purge Sys Large Supply & Exhaust Valves Are Closed as Required
ML20137G675
Person / Time
Site: Limerick  Constellation icon.png
Issue date: 03/24/1997
From:
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20137G665 List:
References
NUDOCS 9704010463
Download: ML20137G675 (5)
v • d • e


Text

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a 4 e a ATTACHMENT 2 LIMERICK GENERATING STATION UNITS 1 AND 2 LICENSE CHANGE REQUEST NO. 96-23-0 AFFECTED PAGES UNIT 1 UNIT 2 3/4 6-11 3/4 6-11 B 3/4 6-2 B 3/4 6-2 9704010463 970324 PDR ADOCK 05000352 P PDR ,

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CONTAINMENT SYSTENS

.

  • ORYWELL AND SUPPRESSION CHAMBER PURGE SYSTEM LIMITING CONDITION FOR OPEPATION 3'J.1.8 The drywell and suppression chamber purge system may be in operation

,.-- @,4p ya @ Vurs/eacV 36'VdaA]with the supply and exhaust isolation valves C [

in one supply line and one exhaust line open for inerting, deinerting b pressure control f; 4Lg4 e air gWiN cmudersher s fe, je s.%.le,dep eiro,,cyergLw, b ed nah /e rezaset the valJes k be eters. ,

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2,.and 3. '

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) i 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 />, i

SURVEILLANCE RE0VIREMENTS 4.6.1.8Se ore /ein opey'ed, de dr ell 4nd sup'pressfon chjtsber,$' urge,tuppi nyex us bu trf1 issatio valv s s i be M or m e an 0hurs/nt pre ous 65 day s /yeriffed not/to Mve bepn op l

1 Al lud *nce, pr 38 k

  • each frS<r4 conlasn'n,en) j bg , valsc[le%21"] is ver Ne,,W. -*y* **

furje  ; l l

l 1

i I

l l

thh LW

  • Valves open for pressure control are not subject to [VI80/our pM65J6) f l

@ provided the 1-inch /2-inch bypass line is being utilized.

n 0,y regos edr 40 be Hef in OfERhir0%'- CMDtTl0MS I,2 *nd 3.

4+fr Nd regshd 40 k me+ % he rmsy c*hin~ce d proc **I*n *'c cf*n fo<

snsehng, Ae-inerfin3,frecare cen4rel, ALAgA ee air quahh coualersfieru for fsrsonne]

e6+ey or L e m il.nce3 + Q r , g et g ,g y,jg,3 4, be open .

M295 LIMERICX - UNIT 1 3/4 6-11 Amendment No.115

. - . . . . . . .. . . .. . .  : ..  : = ~. :

.- I BASES .

~

3/4.6.1.5 PRIMARY CONTAlh&ENT STRUCTURAL INTEGRITY This limitation ensures that the structural integrity of the containment I will be maintained comparable o the original design standards for the life of the unit. Structural integri+.y !s required to ensure that the containment will withstand the maximum calculated pressure in the event of a LOCA. A visual inspection in accordance with the Primary Containment Leakage Rate Testing Program is sufficient to demonstrat? this capability.

1 3/4.6.1.6 ORYWELL AND SUPPRESSION CHAMBER INTERNAL PRESSURE 1

The limitations on drywell and suppression chamber internal pressure ensure that the calculated containment peak pressure does not exceed the design 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 ,

i will limit the total pressure to s 44 psig which is less than the design  !

pressure and is consistent with the safety analysis. >

i

]!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.

g c* *Md3 !

3/4.6.1.8 ORYWELL AND SUPPRESSION CHAMBER pVRGE SYSTEM WA ' fd The drywell and suppression chamber pu

$.Ne hdf.{d.pR h) i ply and exhaust isolattor l

valves are required to be closed during pla nneration except as reouired for  :

inertino, deinertina,dii$ pressure control '

(EurceMalw'oneratJcW if imposed to prote/'D#e 180 h6urs/per ct the integrity of the SGi5 265 #ay Kat1/b3 tilters.

Analysis indicates t at should a LOCA occur while this pathway is being utilized, the associated pres ure surge through the (18 or 24") purge lines will adversely affect the integri y of SGTS. This limit is not imposed, however, on the subject {

valves when press e control is being performed through the 2-inch bypass line, since a pressure urge through this line does not threaten the OPERABILITY of SGIS.

4 M)

} LQ %. ne of de' dit'll "^d sapec 'a.m **A'f%c'3'h

(

o spefL cd fc-rk l _

I Surveillance requirement 4.6.1.8 ensures that the pnmary containment purge valves are closed as I l required or, if open, open for an allowable reason. If a purge valve is open in violation of this SR, the l

v:lve is considered inoperable. The SR is modified by a Note stating that primary containment purge i vrives are only required to be closed in OPERATIONAL CONDITIONS 1,2 and 3. The SR is also i

modified by a Note stating that the SR is not required to be met when the purge valves are open for the '

stated reasons. The Note states that these valves may be opened for inerting, de-inerting, pressure

{

control, ALARA or air quality considerations for personnel entry, or Surveillances that require the valves to /

l be open. The 18 or 24 inch purge valves are capable of closing in the environment following a LOCA.  !

Th:refore, these valves are allowed to be open for limited periods of time. The 31 day Frequency is consistent with other PCIV requirements. g 7 4 7-1 LIMERICK - UNIT 1 B 3/4 6-2 AmendmentNo, 2g,.106, 115, 118

CONTAINMENT SYSTEMS

, . DRYWELL AND SUPTRESSION CHAMBER PURGE SYSTEM l LIMITING CONDITION FOR OPERATION 3 A 1.8  !

bdC The drywell and sunnression chamber purge system may be in operation I

' Tfo/ uVto )10 hpdrs adh M5 dds) with the supply and exhaust isolation valves in one supply line

  • and one exhaust line open for inerting, deinerting,@ Deleb {

pressure cont ,

j wk A LARA%e reteira or misss N Wh kc****dershen.s be orm. 40' P*'2***l enfry or S.orse,I%s t%) '

APPLICABILITY
OPERATIONAL CONDITIONS 1, 2, and 3.

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)  !

l 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 S14UTDOWN within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. l SURVEILLANCE REOUIREMENTS 4.6.1.8]Beorebei opened the dr ell and uppre ion chap 6er p sup i nd e aus butterf isola on valv shall veri ed nota o hav een en Delek for re an 180 ours in he prev ous 365 ays.*f (

AN hi leM) ence per- 3 \ d<ys , vers each p,[ conlaunmd .e.vslag[gg**,,g is c!med.* ,g 14'o LCo

  • V lves ocen for pressure control are not subject to be idhourIr 365[] l

'i provided the 1-inch /2-inch bypass line is being utilized.

+w Ong required h h Mef In MWW C30mW5 8,2, and 3.

    • %F rego,' red to be me$ den % fenry coEnmen$ PGC Wives are ofen bt'

\ssrEn erdr(ee 3,(dt -inerfiny vrveill.rre3 tM refutetf'twre Cmlro) flese valves b,hAlbPs open . or ai- qual,Q g 2 9 1996 cons <der LIMERICA - UNIT 2 3/4 6-11 Amendment No. 77 0 ^ ^ '

....a . . . . . . - . . ~ . - - ~ . . ~ ~ - - - ~ ~ . - ~ . . - ~ ~ ~ . -.. - --- X

BASES -

. 3/4.6'1.5 PRIMARY CONTAVNMENT STRUCTURAL !NTEGRfTV This limitation ensures that the structural integrity of the containment ci1l be ' maintained comparable to the original design standards for the life of the unit. Structural integrity is required to ensure that the containment will cithstand the maximum calculated pressure in the event of a LOCA. A visual inspection in accordance with the Primary Containment Leakage Rate Testing Program is sufficient to demonstrate this capability.

3/4.6.1.6 DRYWELL AND SUPPRESSION CHAM 8ER INTERNAL PRESSURE i I

The limitations on drywell and suppression chamber internal pressure ensure '

that the calculated containment peak pressure does not exceed the design 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 pressure and is consistent wi*h 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 or 340 r, during steam line break conditions and is consistent with the " M y anf l AJ,!

htMA or a e ku*hk-i '*Mder*k. s for 3 i s 3/4,6.1.8 DRYWELL AND SUPPRESSION CHAMBER PURGE SYSTEM fyQ%* * M te The drywell and suppression chamber pur supply and exhaust isolation valves are required to be closed during pla _ceeration except_as recuired for j

inerting, deinerting M pressure control, Thel 80 be'urs/per/3654ay Pf'mitAin)

Cource vilve,dpergio3 is imposed to protect the integrity of the SGTS filters. ,

Analysis indicat~es t t should a LOCA occur while this pathway is being utilized, the associated press' re surge through the (18 or 24") purge lines will adversely affect the integrit of the SGTS. This limit is not imposed, however, on the subject valves when pressur control is being performed through the 2-inch bypass line, since a pressure s ge through this line does not threaten the OPERABILITY or SGTS.

i t

Q the Oce ch he kryeb QN Pfffudon c&

M to Efec8hc criferiq / ~

t

(

\ Surveillance requirement 4.6.1.8 ensures that the primary containment purge valves ar equired or, if open, open for an allowable reason. If a purge valve is open in violation of this Md vahre is e nsidered in perable. The SR is modified by a Note stating that primary conta valves are only required to be closed in OPERATIONAL CONDITIONS 1,2 and 3. The SR is also i modified by a Note stating that the SR is not required to be met when the purge valves are o stated reasons. The Note states that these valves may be opened for inerting, de.inerting, pres control, ALARA or air quality considerations for personnel entry, or Surveillances that require the t

be open. The 18 or 24 inch purge valves are capable of closing in the environment followi Therefore, consistent with otherthese valves PCIV are allowed to be open for limited periods of time. The 31 day requirements.

p4g LIMERICK - UNIT 2 B 3/4 6-2 ,,

Amendment No. .97-*** 31 I

9

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