Text

Proposed Tech Specs Section 3.5.1 & Associated Bases Section 3/4.5.1 & 3/4.5.2 Re ECCS
	ML20082B548
Person / Time
Site:	Limerick
Issue date:	03/29/1995
From:	; PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	;
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ML20082B539	List: ML20082B536; ML20082B548;
References
	NUDOCS 9504050209
	Download: ML20082B548 (7)
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ATTACHMENT Umerick Generating Station Units 1 and 2 Docket Nos. 50452 50453 Ucense Nos. NFP-39 NFP-85 Technical Specifications Change Request No. 93 23-0 Revised Technical Specifications Pages Unh 1 UnN2 3/45-2 3/45-2 3/4 54

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9504050209 950329 PDR ADOCK 05000352 P PDR

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1 EMERGENCY CORE COOLING SYSTEMS v

iLINITING CONDITION FOR'0PERATION (Continued)'

ACTION: , u

a. For the core spray system:-

' 1. _ With one CSS subsystem inoperable, provided that at least two LPCI-L subsystems are OPERABLE, restore the inoperable CSS subsystem to OPERABLE status within 7 days or be in at least HOT SHUTDOWN within1 the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in C0t.D SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .# ,

2. With both CSS subsystems inoperable, be in at least HOT SHUTDOWN within.-12 hours and in COLD SHUTDOWN within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months ,

b. For the LPCI system:

1. With one LPCI subsystem inoperable, provided that at least one CSS subsystem is OPERABLE, restore the inoperable LPCI pump to OPERABLE status within 30 days or be in at least HOT SHUTDOWN within the next-12 hours and.in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

2. With one RHR cross-tie valve (HV-51-182 A or B) open, or power not removed from one closed RHR cross-tie valve operator, close the open valve and/or remove power from the closed valves _ operator within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , or be in at least HOT SHUTDOWN within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

3. With no' RHR cross-tie valves (HV-51-182 A, B) closed, or power not removed from both closed RHR cross-tie valve operators, or with one RHR cross-tie valve open and power not removed from the other RHR cross-tie valve operator, be in at least HOT SHUTDOWN within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

4. With two LPCI subsystems inoperable, provided that at least one CSS subsystem is OPERABLE, restore at least ihree LPCI subsystems to OPERABLE status within 7 days or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .#

5. With three LPCI subsystems inoperable, provided that both CSS subsystems are OPERABLE, restore at least two LPCI subsystems to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be'in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

6. With all four LPCI subsystems inoperable, be in at least HOT SHUTDOWN within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHilTDOWN within the next i 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .*

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Whenever both shutdown cooling subsystems are inoperable, if unable to attain COLD SHUTDOWN as required by this ACTION, maintain reactor coolant temperature as-low as practical by use of alternate heat removal methods.

- . #The Allowed Outage Times (A0Ts) of the 'B' Core Spray subsystem and the 'B' and 'D' LPCI subsystems may be extended up to 14 days to allow for installation of the common ESW and RHRSW system Modifications P-0166, P-0167, and P-0168 during the Unit 2 third refueling outage (2R03).

LIMERICK - UNIT 1 3/4 5-2 v , .* ,v-e,--e

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s _s e-MERGENCY CORE COOLING SYSTEMS

' LIMITING CONDITION FOR OPERATION (Continued)

ACTION:, (Continued) a

c. For the'HPCI system:

1. With the HPCI system inoperable,-provided the CSS, the LPCI l system, the ADS and the RCIC system are OPERABLE, restore the HPCI system to OPERABLE status within 14 days or be'in~at,least HOT SHUTDOWN within the next-12 hours and reduce reactor steam dome ~ pressure to s 200 psig within the'following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . ;

2. With' the HPCI system inoperable, and one CSS subsystem, and/or. .

i. LPCI subsystem inoperable, and provided at least one CSS subsystem,-

three LPCI subsystems, and ADS are operable, restore the HPCI to OPERABLE within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , or be'in HOT SHUTDOWN in the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , and in COLD SHUTDOWN.in the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

d. For the ADS:

1. With one of the above required ADS valves inoperable, provided the HPCI system, the CSS and the LPCI system are OPERABLE, restore the inoperable ADS valve to OPERABLE. status within 14 days or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and reduce reactor steam doma pressure to s 100 psig within the-next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

2. With two or more of the above required ADS valves inoperable, 4 be in at least HOT SHUTDOWN within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and reduce reactor steam dome pressure to s 100 psig within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

1 'e. With a CSS and/or LPCI header AP instrumentation channel inoperable, restore the inoperable channel to OPERABLE _ status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or determine the ECCS header AP locally at least once por 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months ; otherwise, declare the associated CSS and/or LPCI, as; applicable, inoperable,

f. In the event an ECCS system is actuated and injects water into the reactor coolant system, a Special Report shall be prepared and sub-mitted to the Commission pursuant to Specification 6.9.2 within 90 days describing the circumstances of the actuation and the total accumulated actuation cycles to date. -The current value of the usage factor for _each affected safety injection nozzle shall be provided in this Special Report whenever its value exceeds 0.70.

LIMERICK - UNIT 1 3/4 5-3

EMERGENCY C' ORE C0OLING SYSTEM RASES

((CS'- OPERAT'ING and SHUTDOWN :(Continued) r With the HPCI system inoperable, adequate core cooling is assured by the M CRA218ITY of the redundant and diversified automatic depressurization system m ' and both tn c.S and LPCI systems. .In addition, the reactor core isolation

.,, cooling (RCIC) ;ystem, a system for which no credit is taken in the safety i analysis, will' automatically provide makeup at reactor operating pressures on l a reactor low water. level condition. The HPCI out-of-service period of 14 days '

is based on the demonstrated OPERABILITY of redundant and diversified low l

. pressure core cooling systems and the RCIC system. The HPCI system, and one LPCI i subsystem, and/or one CSS subsystem out-of-service. period'of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ensures that l sufficient ECCS, comprised of a minimum of one CSS subsystem, three LPCI subsystems, and all of the ADS will be available to li provide for safe shutdown of the facility, and 2) mitigate and control accident conditions within the facility.

The surveillance requirements provide adequate. assurance that the HPCI system will be OPERABLE when required. Although all active components are testable and full flow can be demonstrated by recirculation through a test loop during reactor operation, a complete functional test with reactor vessel injection requires reactor shutdown. The pump discharge piping is maintained full to prevent water hammer damage and to provide cooling at the earliest moment.

I Upon failure of the HPCI system to function properly after a small break loss-of-coolant. accident, the automatic depressurization system (ADS) automa-2-

tically causes selected safety / relief valves to open, depressurizing the reactor so that flow from the low pressure core cooling systems can enter the core in

. time to limit fuel cladding temperature to less than 2200*F. ADS is conserva-tively required to be OPERABLE whenever reactor vessel pressure exceeds 100 psig.

This pressure is substantially below that for which the low pressure core cool-

ing systems can provide adequate core cooling for events requiring ADS.

ADS automatically controls five selected safety-relief valves. The safety analysis assumes all five are operable. The allowed out-of-service time for one ,

valve for up to fourteen days is determined in a similar manner to other ECCS 3 sub-system out-of-service time allowances.

3/4.5.3 SUPPRESSION CHAMBER

.The suppression chamber is required to be OPERABLE as part of the ECCS to i' ensure that a sufficient supply of water is available to the HPCI, CS and LPCI systems in the event of a LOCA. This limit on suppression chamber minimum water volume ensures that sufficient water is available to permit recirculation i

cooling flow to the core. The OPERABILITY of the suppression chamber in L OPERATIONAL CONDITION 1, 2, or 3 is-also required by Specification 3.6.2.1.

1 Repair work might require making the suppression chamber inoperable. This

-specification will permit those repairs to be made and at the same time give

_ assurance that the irradiated fuel has an adequate cooling water supply when the suppression chamber must be made inoperable, including draining, in

' OPERATIONAL CONDITION 4 or 5.

In OPERATIONAL CONDITION 4 and 5 the suppression chamber minimum required

water volume is reduced because the reactor coolant is maintained at or below 200*F. Since pressure sup)ression is not required below 212*F, the minimum

water volume is based on N)SH, recirculation volume and vortex prevention plus

.a safety margin for conservatism.

l LINERICK - UNIT 1 B 3/4 5-2 V . - - - - - - - _ _ _ _ - - - _ -

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EMERGENCY CORE COOLING SYSTEMS

LIMIThNG CONDITION FOR OPERATION (Continued)

ACTIONt.

a. For the core spray system:

1. With one CSS-subsystem inoperable, provided that at least two LPCI subsystems are OPERA 8LE, restore the inoperable CSS subsystem to-OPERABLE status within 7 days or be in.at least HOT SHUTDOWN within-the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

2. With both CSS subsystems inoperable, be in at least HOT SHUTDOWN-within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

b. .For the LPCI system: ,

1. With one LPCI subsystem inoperable, provided that at least one CSS ~

subsystem is OPERABLE, restore the inoperable LPCI pump to OPERABLE status within 30 days or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

' 2. With one RHR cross-tie valve (HV-51-282 A or B) open, or power not l removed from one closed RHR cross-tie valve operator, close the open valve and/or remove power from the closed valves , operator within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , or be in at least HOT SHUTDOWN within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

3. With. no RHR cross-tie valves (HV-51-282 A, B) closed, or power not. removed from both closed RHR cross-tie valve operators, .or with one RHR cross-tie valve open and power not removed from

the other.RHR cross-tie valve operator, be in at least HOT SHUTDOWN within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

4. .With two LPCI subsystems inoperable, provided that at least one CSS subsystem is OPERABLE, restore at least three LPCI subsystems to

- OPERABLE status within 7 days or be in.at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

5. With three LPCI subsystems inoperable, provided that both CSS subsystems are OPERABLE, restore at least two LPCI subsystems'to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

6. With all four LPCI subsystems inoperable, be in at least HOT r SHUTDOWN within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and in COLD SHUTDOWN within the next. ,

24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .*

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0Whenever both shutdown cooling subsystems are inoperable, if unable to attain COLD SHUTDOWN as required by this ACTION, maintain reactor coolant temperature as. low as practical by use of alternate heat removal methods, i

LlHERICK - UNIT 2 3/4 5-2 ,

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' EMERGENCY CORE COOLING SYSTEMS

-LINITING CONDITION FOR OPERATION (Continued)

ACTION: (Continued)

c. For the HPCI. system:

1. Withthe HPCI system inoperable, piovided the CSS, the LPCI system, the ADS and the RCIC system are OPERABLE,. restore the HPCI system to OPERABLE status within 14 days or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and reduce reactor steam dome pressure to s 200 psig within the following 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

2. With the HPCI system inoperable, and one CSS subsystem, and/or LPCI subsystem inoperable, and provided at least one CSS subsystem,

.three LPCI subsystems, and ADS are operable, restore the HPCI to OPERABLE within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months , or be in HOT SHUTDOWN in the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , and in COLD SHUTDOWN in the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

-d. For the ADS:

1. With one of the above required ADS valves inoperable, provided the HPCI system, the CSS and the LPCI system are OPERABLE,-

restore the inoperable ADS valve to OPERABLE status within 14 days or be in at least HOT SHUTDOWN within the next 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months s-and reduce reactor steam dome pressure to s 100 psig within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

2. With two or more-of the above required ADS valves inoperable, be in at least HOT SHUTDOWN within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months and reduce reactor steam dome: pressure to s 100 psig within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . -

e. With a CSS and/or LPCI header AP instrumentation channel inoperable,. ,

restore the inoperable channel to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or determine the ECCS header AP locally at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months ; otherwise, declare the associated CSS and/or LPCI, as applicable, inoperable..

f. In the event an ECCS system is actuated and injects water into the reactor coolant system, a Special Report-shall be prepared and sub-mitted to'the Commission pursuant to Specification 6.9.2 within -

90-days describing the circumstances of the actuatieri and the total accumulated actuation cycles to date. The current value of the usage factor for each affected safety injection nozzle shall be provided in this Special Report whenever its value exceeds 0.70.

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LIHERICK - UNIT 2 3/4 5-3 l

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EMERGENCY' CORE COOLING SYSTEM BASES

-ECCS - OPERATING and SHUTDOWN (Continued) ,

With the HPCI system inoperable, adequate core cooling is assured by the

-OPERABILITY of the redundant and diversified automatic depressurization system and both the CS.and LPCI systems. In addition, the reactor core isolation cooling (RCIC) system, a system for which no credit is taken in the safety

' analysis, .will automatically provide makeup at reactor operating pressures on a reactor low water level condition. The HPCI out-of-service period of 14 days is based on the demonstrated OPERABILITY of redundant and diversified low pressure core cooling systems and the RCIC system. The HPCI system, and one LPCI subsystem, and/or one CSS subsystem out-of-service period of 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ensures that sufficient ECCS, comprised of a minimum of one CSS subsystem, three LPCI subsystems, and and 2)allmitigate of the ADS and will be available control' to 1)tions within the facility. provide for safe shutdown of accident condi The surveillance requirements provide adequate assurance that the HPCI

-system will be OPERABLE when required. Although all active components are testable and full flow can be demonstrated by recirculation through a test loop

.during reactor operation, a complete functional test with reactor vessel injection requires reactor shutdown. The pump discharge piping is maintained i- full to prevent water hammer damage and to provide cooling at the earliest moment.

Upon failure of the HPCI system to function properly after a small break loss-of-coolant accident, the automatic depressurization system tically causes selected safety / relief valves to open, depressuriz(ADS) automa-ing the reactor so that flow from the low pressure core cooling systems can enter the core in time to limit fuel cladding temperature to less than 2200*F. ADS is conserva-tively required to be OPERABLE whenever reactor vessel pressure exceeds 100 psig.

This pressure is substantially below that for which the low pressure core cool-ing systems can provide adequate core cooling for events requiring ADS.

ADS automatically controls five selected safety-relief valves. The safety analysis assumes all five are operable. The allowed out-of-service time for one valve for up to fourteen days is determined in a similar manner to other ECCS

sub-system out-of-service time allowances.

-3/4.5.3 SUPPRESSION CHAMBER The suppression chamber is required to be OPERABLE as part of the ECCS to ensure that a sufficient supply of water is avaliable to the HPCI, CS and.

L LPCI systems in the event of a LOCA. This limit on suppression chamber minimum water volume ensures that sufficient water is available to permit recirculation cooling flow to the core. The OPERABILITY of the suppression chamber in 1

OPERATIONAL CONDITION 1, 2, or 3 is also required by Specification 3.6.2.1.

Repair work might require making the suppression chamber inoperable. This specification will permit those repairs to be made and at the same time give assurance that the irradiated fuel has an adequate cooling water supply when c the suppression chamber must be made inoperable, including draining, in OPERATIONAL CONDITION 4 or 5.

-In OPERATIONAL CONDITION 4 and 5 the suppression chamber minimum required water volume is reduced because the reactor coolant is maintained at or below 200'F. Since pressure sup)ression is not required below 212*F, the minimum l water volume is based on N)SH, recirculation volume and vortex prevention plus a safety margin for conservatism.

LIMERICK - UNIT 2 B 3/4 5-2 )

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ML20082B548

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