ML20141C593

Proposed Tech Specs Section 15.3.3, Eccs,Acs,Air Recirculation Fan Coolers & Containment Spray to Incorporate Allowed Outage Times Similar to Those Contained in NUREG-1431,Rev 1

ML20141C593
Person / Time
Site:	Point Beach
Issue date:	05/09/1997
From:	WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML20141C581	List: ML20141C593 NPL-97-0249, Suppl to TS Change Request 192 to Licenses DPR-24 & DPR-27, Modifying TS Section 15.3.3, Eccs,Acs,Air Recirculation Fan Coolers & Containment Spray to Incorporate Allowed Outage Times Similar to Those Contained in NUREG-1431,Rev 1
References
RTR-NUREG-1431 NUDOCS 9705190101
Download: ML20141C593 (7)

Text

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B.' Containment Cooling and Iodine Removal Systems

1. A reactor shall not be made critical, except for low temperature physics tests, unless the following conditiens associated with that reactor are met:

a.' The spray additive tank contains not less than 2675 gal. of solution with a l sodium hydroxide concentration of not less than 30% by weight.

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b. - Two containment spray pumps are operable.

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c. Four accident fan-cooler units are operable. i

d. All valves and piping, associated with the above components and required to function during accident conditions, are operable.

2. - During power operation, the requirements of 15.3.3.B-1 may be modified to allow any ONE of the following ec= pen:::: te be inc;;25!: limitations (a.. b.. or c.) to j be in effect at any one time. If the system is not restored to meet the requirements of 15.3.3.B-1 within the time period specified, the reactor shall be placed in the hot shutdown condition within six hours and in cold shutdown within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.- I l

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a. O= : ident f= cec!:: = y be cut cf 30 vie: p=vided S:t Oce!::is -

:=ned ic cp =b!: *::= viiin 18 heur. He cS:: =:id= f= ce!:= 1 ch:!! be op:=b!: b:Are irhiating = Int == : = Se incp =b!::: id

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l One or two accident fan coolers may be out of service orovided the fan

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. coolers are restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The remaining accident fan coolers shall be onerable.

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b. One containment spray pump may be out of service provided the pump is restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The remaining containment spray pump shall be operable b:fc= inh!: ting =: int:n= : en S:

i=p:=b!: pump.

c. Any valve required for the functioning of the system during accident conditions may be inoperable provided repairs are completed within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Prior to initiating repairs, all valves in the system that provide the duplicate function shall be operable. mxception: if a spray pumnjs removed from service per b. above. valves associated with that train may be removed from service for the neriod specified for the pum_n.)

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l l 9705190101 970509 i PDR ADOCK 05000266 i P PDR _

i j Unit 1 - Amendment No.-M9 15.3.3-3 D:::=ber 21,1991 1

i Unit 2 - Amendment No.-Ma

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C. Comnonent Coolino System i l

Single U 9 One 2!cn

1. OfQLreactor shall not be made critical unless the following conditions are met:

a.- The two component cooling pumps assigned to that unit are operable.

b. Either the component cooling heat exchanger associated with the unit together with one of the shared spare heat exchangers are operable or the t two shared spare heat exchangers are operable for single unit operation. .

Three component cooling heat exchangers are operable for two unit operation.

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c. All valves, interlocks and piping associated with the above components, l and required for the functioning of the system during accident condition, i are operable.  !

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2. During power operation, the requirements of 15.3.3.C-1 may be modified to allow; j one of each of the following conditions at any one time. If the system is not - ,

restored to meet the conditions of 15.3.3.C-1 within the tim r eriod specified, the i reactor shall be placed in the hot shutdown condition. If the requirements of  ;

15.3.3.C-1 are not satisfied within an additional 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, the reactor shall be j placed in the cold shutdown condition. l

a. One of the assigned component cooling pumps may be out of service provided a pump is restored to operable status within 2422 hours0.028 days <br />0.673 hours <br />0.004 weeks <br />9.21571e-4 months <br />.

b. -TweOne of the reauired heat exchangers etich :=y be alig=d to the operating =!: may be out of service provided repairs can be completed within 4822_ hours.

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i Unit 1 - Amendment No.-M9 15.3.3-4 Daenber 21,1991 Unit 2 - Amendment No..#4

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e D. Service Water System

1. Neither Areactor shall not be made cr :n^:ntained critical unless the following I 1

conditions are met: '

a. Four-Six service water pumps are operable, tre frc:n : ch train 1

b. All necessary valves. interlocks and piping required for the functioning of the Service Water System during accident conditions fo.r the unil  :

which is to be made critical are also operable.

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) Unit 1 - Amendment No.105 15.3.3-5 February 22,19W Unit 2 - Amendment NoA08

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2. During power operation, the requirements of 15.3.3.D-1 may be modified to allow enedthe following ecmpenent- to be inoperable-conditionsat any one !me. If the j system is not restored to meet the conditions of 15.3.3.D-1 within the tirae period j specified, both the affected reactor (s) will be placed in the hot shutdown condition l within six hours and in cold shutdown within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.

l a. One cfie four required serice veter pump: may-be cut of cervice provided a

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pump i = :cred te operable sta:= viiin 21 hcum  !

One of the six reauired service water numns may be out of service nrovided a I pumn is restored to operable status within 7 days. A second service water

pump may be out of service provided a numn is restored to operable status f within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. A third service water pumn may be out of service provided ]

two numns are restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. l I

I b. One of Se tvec ! cop headem The service water ring header contmuous flowp;tth_may be out of service for a period of 21 heu=2_ days. Ifless than  !

! four service water pumns are onerable. service water system How shall be cyaluated within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> ofless than four service water numns beine l goerable. Ifilis determined that any equipment will not receive sufficient i flow. the applicable LCOs for the affected eauinment shall be entered. These

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LCOs can be exited if system realienment is comnleted to achieve the reauired How rates for the : frected eauinment.

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c. A Any or all automatic isolation valves or cier p= ive ecmponent required during accident conditions may be out of service for up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> provided repai= can be ecmpleted ..iiin 1? howsat least four service water num_ns are operable. This LCO can be exited tvovided the lines are isolated with a l seismically qualined isolation valve or the valves are restored to onerable statuL

d. The containment fan cooler outlet motor _ operated valves may be onen for up to 72 houtsprovided at least five service water n_ umns are onerable. This LCO can be exited nrovided the valves are returned to the closed nosition or the flownath is isolated.

Basis The normal procedure for starting the reactor is, first, to heat the reactor coolant to near operating l temperature, by running the reactor coolant pumps. The reactor is then made critical by 1 l withdrawing control rods and/or diluting boron in the coolant.W With this mode of start-up, the energy stored in the reactor coolant during the approach to criticality is substantially equal to that i

during power operation and therefore to be conservative most engineered safety system components and auxiliary cooling systems, shall be fully operable. During low temperature physics tests there is a negligi ,le amount of stored energy in the reactor coolant, therefore an

accident comparable in severity to the Design Basis Accident is not possible, and the engineered safety systems are not required.

i Unit 1 - Amendment No.463 15.3.3-6 Ge:cher 12,1995 4

Unit 2 - Amendment N" 5 47

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I and k4)long term subcriticality is maintained following a steamline break assuming ARI-l and

, fuel failure is precluded.

l The containment cooling function is provided by two independent systems: (a) fan coolers and i-(b) containment spray which, with sodium hydroxide addition, provides the iodine removal i

function. During normal power operation, only three of the four fan coolers are required to  ;

j remove heat lost from equipment and piping within the containment.") In the event of a Design i Basis Accident, any one of the following combinations will provide sufficient cooling to reduce i

containment pressure: (1) four fan coolers, (2) two containment spray pumps, (3) two fan coolers ,

) plus one containment spray pump.") Sodium hydroxide addition via one spray pump reduces -  !

_ airborne iodine activity sufficiently to limit off-site doses to acceptable values. One of the fc=

j' 1 or two fan coolers is-arc _ permitted to be inoperable for up to 48-2 hours during power operation. )

j Specification 15.3.3.B.2.c requires valves that provide the duplicate function be operable prior to j initiating repairs on an inoperable valve. For the specific case of the containment spray pump j discharge (SI-860) valves, SI-860A and SI-860D provide duplicate functions. Valves SI-860B

_ and SI-860C are not required for system operability. Hence, prior to removing valve SI-860A )

from service, valve SI-860D must be operable and vice versa. '

4 l The component cooling system is different from the othei systems discussed above in that the 1 components are so located in the Auxiliary Building as to be accessible for repair after a loss-of- ,

coolant accident. The component cooling water pump together with one component cooling heat i exchanger can accommodate the heat l

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Unit 1 - Amendment No.4@ 15.3.3-9 Dec = 5 :21,19"i Unit 2 - Ainendment No.441

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removal load on one unit either following a loss-of-coolant accident, or during normal plant shutdown. If during the post-accident phase the component cooling water supply is lost, core j and containment cooling could be maintained until repairs were effected.m A total of six service water pumps are installed, only twe-three of which are required to operate during the injection and recirculation phases of a postulated loss-of-coolant accident,# in one unit together with a hot shutdown or normal operation condition in the other unit. For either i

reactor to be critical, feesa. service water pumps must be operable.-Tv/c cf Se pump: must be p0=: red frem S:'A'!=in, z.nd S: cSer twc mu t be pcw:::d frem S:'B'!=in The allowed outage time for a single service water pumn is 7 days. The allowed outage time for two or three service water pumps is 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. If more than one service water numn is inonerable.

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the 7 day allowed outage time starts when the first numn is declared inonerabie and the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />

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allowed outane time for the second and third numns is cumnh.tive startirm from the time the j second pump is declared inopeuble. Therefore. the total time that two or three numns are -

, inonerable during the oeriod that LCO ]5.3.3.D.2.a is in effect must not exceed 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. All l pumps must be restored to operable status within 7 days of the first _oumn being declared inoperable. Specifications 15.3.3.D.2.c requires four and 15.3.3.D.2.d reauires five service water

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pumps to be operable to provide sufficient flow for accident mitigation when these soecifications are in effect.

The service water ring header continuous flownath LCO reauirement (TS 15.3.3.D.2.b) anolies ~

anytime continuity of the flowcath in the service water ring headeds interruoted. This includes l isolation of any nart of the ring header. This LCO recogni7es that one aspect of redundancy in j the service water system is the ability to isolate a break in the system and still maintain ability to provide required flow to supported equipment. This capability is impaired anytime the continuous flownath of the ring header is blocked. The 7 day allowed outage time is based on the fact that a piping failure must os. cur to cause a subsequent problem with system operability.

l-l Piping failures are not considered as tne single failure for system functionality during an I accident.

l TS 15.3.3.D.2.b requires that service water system flow is evaluatedwithin 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> ifless than .

four service water pumps are operable. This is necessary to ensure that all required equipment will receive sufficient flow in this condition. Ifit is determined that any eauinment will not l receive sufficient flow. the anolicable LCOs for the affected eauinment shall be entered. These

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I LCOs can be exited if system realignment is completed to achieve the required flow rates for the 1 affected equipment.

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Unit 1 - Amendment NoA49 15.3.3-10 DecenSer 21, ln91 i

! Unit 2 - Amendment NoAG

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Entry into the applicable LCOs for the affected equipment is also required when any cart pQhe l service water ring header is removed from service. For example. if the north header is remond l from service. al! Tecimical Specification recuited equipment reauired for operation should be et have already been switched to the south header. The containment accident fan cooler inoperability requires entry into the apnlicable LCO for Unit 2 ffS_15.3.3.B.2.a which is 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />) when the header is removed from service. If Unit 2 is already in a shutdown condition where containment accident fan cooler operability is not required. no LCO would ar,piv. UniL1 would be abiect to the 7 day allowed outage time for the loss of the service water rine header continuoas flownath. The 7 day allowed outage time is based on approximate renair time for

, system piping and the possibility that a mechanical failure in another part of the system could result in a loss of service water system function.

Ihe_contilnment fan cooler service water outlet motor coerated valves consi,st of two fully redundant valves that are automatically onened in resoonse to a safety iniection sienal. Either valve is capable of passing the full flow required for all four fan cooler units in accident modem At various times. these valves are opened to allow testing of the containment fan coolers or adjustment of the system flow rates. If one or both of these motor operated valves are open in a unit. there may be insufficient service water flow ibn accident occurs in the other unit and single failure occurs. Therefore. in this case. the other unit is in a limitine condition for operation because relaxation of single failure is necessarv. That unit Ivould be considied the "affected unit" and hence the valves must be closed within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> et the affected unk must be, shut down. If the valves are open in both units. they would both be considered "affected" until such time that the motor onerated vulves were closed for a unit. at whichlime the aHected vail wnuld be the unit with the closed valves. The 72 bour allowed time is cons 6 tent with the relaxation of single failure and allowed outage time associated with a loss of redundancy for the service water system. For the case of single unit operation. the valves for the operating mit may be onen withoutlimitation if the valves for the shutdown unit are in the shut position or the flownath is isolated. The flowcath is considered isolated if total flow would not exceed the _

expected flowrate in the non-accident unit duringfecident conditions..

References

(" FS AR Section 3.2.1 (D (8 FSAR Section 6.3.2 FSAR Section 9.3.2 (2)

FSAR Section 6.2

• FSAR Section 6.3 (O FSAR Section 9.6.2 l

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Unit 1 - Amendment No. 15.3.3-11 Unit 2 - Amendment No.