ML20100H743

Proposed Tech Specs,Revising Changes of Drywell Air Temp LCO from 350 F to 150 F

ML20100H743
Person / Time
Site:	Hatch
Issue date:	02/21/1996
From:	GEORGIA POWER CO.
To:
Shared Package
ML20100H742	List: HL-5004, Application for Amends to Licenses DPR-57 & NPF-5, Respectively,Revising Changes of Drywell Air Temp LCO from 135 F to 150 F ML20100H743
References
NUDOCS 9602280015
Download: ML20100H743 (12)

Text

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t Edwin 1. Hatch Nuclear Plant Request to Revise Technical Specifications.

Drywell Air Temperature r

Page Change Instructions

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Unit 1 i.

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Eage Instruction 3.6-17 Replace Unit 2 L

Eage Instruction 3.6-17 Replace s

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9602280015 960221 PDR-ADOCK 05000321 P

PDR HL-5004 E3-1

Drywell Air Temperature 3.6.1.5 3

3.6 CONTAINMENT SYSTEMS 3.6.1.5 Drywell Air Temperature

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LC0 3.6.1.5 Drywell average air temperature shall be s 150*F.

l APPLICABILITY:

MODES 1, 2, and 3.

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ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

Drywell average air A.1 Restore drywell 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> temperature not within average air

limit, temperature to within limit.

B.

Required Action and B.1 Be in MODE 3.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> associated Completion Time not met.

ANQ B.2 Be in MODE 4.

36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> SURVEILLANCE REQUIREMENTS i

SURVEILLANCE FREQUENCY SR 3.6.1.5.1 Verify drywell average air temperature is 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> within limit.

HATCH UNIT 1 3.6-17 PROPOSED CHANGE 7/31/95 4

Drymell Air Temperature 3.6.1.5 i.

t 3.6 ~CONTAlltiENT SYSTEMS 3.6.1.5 -Drywell Air Temperature l

LCO. 3.6.1.5 Drywell average air temperature shall be s 150*F.

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I APPLICABILITY:

MODES 1, 2, and 3.

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ACTIONS CONDITION REQUIRED MTION COMPLETION TIME m..

A.

Drywell average air A.1 Restore drywell 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> temperature not within average air limit.

temperature to within j

limit.

l B.

Required Action and B.1 Be in MODE 3.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> l-associated Completion i

Time not met.

AND B.2 Be in MODE 4.

36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> h

[

'l SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY j.

SR 3.6.1.5.1 Verify drywell average air temperature is 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> within limit.

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KATCH UNIT 2 3.6-17 PROPOSED CHANGE 7/31/95 f

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Drywall Air Temperature l

3.6.1.5 3.6 CONTAINMENT SYSTEMS 3.6.1.5 Drywell Air Temperature 50 LCO 3.6.1.5 Drywell average air temperature shall be

'F.

APPLICABILITY:

MODES 1, 2, and 3.

' ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME

- A.

Drywell average air A.I Restore drywell 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />

. temperature not within average air limit.

temperature to within limit.

B.

Required Action and B.1 Be in MODE 3.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> associated Completion j

Time not met.

&HQ B.2 Be in MODE 4.

36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> i

l SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY e

SR 3.6.1.5.1 Verify drywell average air temperature is 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> within limit.

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h HATCH UNIT 1-3.6-17 a---d---+

u-

'a" i

Drywell Air Temperature -

3.6.1.5 3.6 CONTAINMENT SYSTEMS 3.6.1.5 Drywell Air Temperature C)

LCO 3.6.1.5 Drywell average air temperature shall be

'F.

APPLICABILITY:

MODES 1, 2, and 3.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME t

i A.

Drywell average air A.1 Restore drywell 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> temperature not within average air limit.

temperature to within limit.

i B.

Required Action and B.1 Be in MODE 3.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> associated Completion Time not met.

6HD B.2 Be in MODE 4.

36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> 4

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY 1

SR 3.6.1.5.1 Verify drywell average air temperature is 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> within limit.

HATCH UNIT 2 3.6-17 f,....f-r-t "- !?5

Edwin I. Hatch Nuclear Plant Request to Revise Technical Specifications:

Drywell AirTemperature Bases Changes

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HL-5004 E4-1 i

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Drywell Air Temperature i

B 3.6.1.5

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B 3.6 CONTAINMENT SYSTEMS B 3.6.1.5 Drywell Air Temperature BASES BACKGROUND The_ drywell contains the reactor vessel and piping, which add heat to the airspace. Drywell coolers remove heat and maintain a suitable environment. The average airspace temperature affects the calculated response to postulated 4

Design Basis Accidents (DBAs). The limitation on the drywell average air temperature was developed as reasonable, i

based on operating experience. The limitation on drywell air temperature is used in the Reference I safety analyses.

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APPLICABLE Primary containment performance is evaluated for a i

SAFETY ANALYSES spectrum of break sizes for postulated loss of coolant accidents (LOCAs) (Ref. 1). Among the inputs to the design

~

basis analysis is the initial drywell average air temperature (Ref. 1). Analyses assume an initial average i

drywell air temperature of 150'F. This limitation ensures l

that the safety analysis remains valid by maintaining the expected initial conditions and ensures that the peak LOCA drywell temperature does not result in the drywell structure exceeding the maximum allowable temperature of 281*F (Ref. 2).

Exceeding this design temperature may result in j

the degradation of the primary containment structure under accident loads. Equipment inside primary containment j

required to mitigate the effects of a DBA is designed to operate and be capable of operating under environmental conditions expected for the accident.

Drywell air temperature satisfies Criterion 2 of the NRC Policy Statement (Ref. 3).

t LCO In the event of a DBA, with an initial drywell average air temperature less than or equal to the LC0 temperature limit, the resultant peak accident temperature is maintained below the drywell design temperature. As a result, the ability of primary containment to perform its design function is

~

ensured.

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(continued)

HATCH UNIT 1 B 3.6-31 PROPOSED CHANGE 7/3)/95

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Drywell Air Temperature B 3.6.1.5 BASES SURVEILLANCE SR 3.6.1.5.1 (continued)

REQUIREMENTS The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Frequency of the SR was developed based on operating experience related to drywell average air temperature variations and temperature instrument drift during the applicable MODES and the low probability of a DBA occurring between surveillances.

Furthermore, the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Frequency is considered adequate in view of other indications available in the control room, including alarms, to. alert the operator to an abnormal drywell air temperature condition.

REFERENCES 1.

FSAR, Sections 5.2 and 14.4.3.

2.

FSAR, Section 5.2.3.2.

l 3.

NRC No.93-102, " Final Policy Statement on Technical Specification Improvements," July 23, 1993.

HATCH UNIT 1 B 3.6-33 PROPOSED CHANGE 7/31/95

Drywell Air Temperature l

B 3.6.1.5 l

B 3.6 CONTAINMENT SYSTEMS l

B 3.6.1.5 ~ Drywell Air Temperature j

i BASES'

' BACKGROUND The drywell contains the reactor vessel and piping, which

[L add heat to the airspace. Drywell coolers remove heat and i

maintain a suitable environment. The average airspace l

temperature affects the calculated response to postulated Design Basis Accidents (DBAs). The limitation on the drywell average air temperature was developed as reasonable, i

2 based on operating experience. The limitation on drywell

[

air temperature is used in-the Reference I safety analyses.

t l

i 4

l APPLICABLE Primary contair. ment performance is evaluated for a i-SAFETY ANALYSES spectrum of break sizes for postulated loss of coolant j

accidents (LOCAs) (Ref. 1). Among the inputs to the design j

basis analysis is the initial drywell average air l

temperature (Ref. 1). Analyses assume an initial average j

drywell air temperature of 150*F. This limitation ensures l

that the safety analysis remains valid by maintaining the expected initial conditions and ensures that the peak LOCA drywell temperature does not result in the drywell structure exceeding the maximum allowable temperature of 340'F (Ref. 2).

Exceeding this design temperature may result in the degradation of the primary containment structure under accident loads.

Equipment inside primary containment required to mitigate the effects of a DBA is designed to operate and be capable of operating under environmental l

conditions expected for the accident.

Drywell air temperature satisfies Criterion 2 of the NRC Policy Statement (Ref. 3).

LCO In the event of a DBA, with an initial drywell average air

~

temperature less than or equal to the LCO temperature limit, the resultant peak accident temperature is maintained below the drywell design temperature. As a result, the ability of primary containment to perform its design function is a

ensured.

]

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(continued)

HATCH UNIT 2 B 3.6-32 PROPOSED CHANGE 7/31/95 1

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-,s Drywell Air Temporature

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B 3.6.1.5 j

B 3.6 CONTAINMENT SYSTEMS i

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8 3.6.1.5 Drywell Air Temperature j

j BASES-i BACKGROUND The drywell contains the reactor vessel and piping, which

[

add heat to the airspace. Drywell coolers remove heat and maintain a suitable environment. The average airspace i

temperature affects the calculated response to postulated Design Basis Accidents (DBAs). The limitation on the drywell average air temperature was developed as reasonable, based on operating experience. The limitation on drywell j

air temperature is used in the Reference I safety analyses.

l 4

i APPLICABLE Primary containment performance is evaluated for a SAFETY ANALYSES spectrum of break sizes for postulated loss of coolant accidents (LOCAs) (Ref. 1). Among the inputs to the design i

basisanalysisistheinit4 11 average air temperature (Ref. 1). An( yses a uma an initial average

• n ' t. n 27 his limitation ensures

/50*FI that the safety'eratureanalysis em inslid by maintaining the 6 -- -

expected initial condition m + h+ th= md.0cA ygggt g drywell temperature does not(ememesti maximum a' owa me NE l

temperature of 281*F (Ref. 2; Exce ng this design t

temperature may result in the ation of the primary gle%. '

containment structure under accident loads. Equipment g

inside primary containment required to mitigate the effects 83 of a DBA is designed to operate and be capable of operating l

under environmental conditions expected for the accident.

Drywell air temperature satisfies Criterion 2 of the NRC Policy Statement (Ref. 3).

5.

LCO In the event of a DBA, with an initial drywell average air temperature less than or equal to the LC0 temperature limit, 4

j the resultant peak accident temperature is maintained below the drywell design temperature. As a result, the ability of primary containment to perform its design function is ensured.

lr (continued) i HATCH UNIT 1-B 3.6-31 REVISION 1

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1 Drywell Air Temperature B 3.6.1.5 BASES 4

SURVEILLANCE SR 3.6.1.5.1 (continued)

REQUIRENENTS The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Frequency of the SR was developed based on operating experience related to drywell average air temperature variations and temperature instrument drift during the applicable NODES and the low probability of a DBA occurring between surveillances.

Furthermore, the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> i

Frequency is considered adequate in view of other indications available in the control room, including alarms, to alert the operator to an abnormal drywell air temperature condition.

REFERENCES 1.

FSAR, Section

.2 and 14.4.3.

~

2.

FSAR, Secti

% d,d 3.,c2, 3.

NRC No. 93-1 al P c

t on Technical Specification Improv nts, July 23, 1993.

4 e

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i HATCH UNIT 1 8 3.6-33

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Drywell Air Temperature i

8 3.6.1.5 B 3.6 CONTAINMENT SYSTEMS B 3.6.1.5 Drywell Air Temperature

~

BASES i

BACKGROUND The drywell contains the reactor vessel and piping, which

{

add heat to the airspace. Drywell coolers remove heat and maintain a suitable environment. The average airspace temperature affects the calculated response to postulated Design Basis Accidents (DBAs). The limitation on the drywell average air temperature was developed as reasonable, based on operating experience. The limitation on drywell air temperature is used in the Reference I safety analyses.

i APPLICABLE Primary containment performance is evaluated for a

)

SAFETY ANALYSES spectrum of break sizes for postulated loss of coolant accidents (LOCAs) (Ref. 1). Among the inputs to the design basis analysis is the initial ell average air temperature (Ref. 1). Ana s

m,--ii u r t=w r.6ure v une an initial average l g-is limitation ensures that the safety analysis re vali y maintaining the expected initial conditions (ii"dbnsures at the peak LOCA si temperature aoes na _

th aximum allowable i

Y M in temperature of 340'F (Ref. (h. YExceed ng this design

).

temperature may result in t ion of the primary

-fhe, al._

containment structure under accident loads.

Equipment inside primary containment required to mitigate the effects g

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of a DBA is designed to operate and be capable of operating under environmental conditions expected for the accident.

Drywell air temperature satisfies Criterion 2 of the NRC Policy Statement (Ref. 3).

LCO In the event of a DBA, with an initial drywell average air temperature less than or equal to the LCO temperature limit, the resultant peak accident temperature is maintained below the drywell design temperature. As a result, the ability of primary containment to perform its design function is ensured.

(continued)

HATCH UNIT 2 B 3.6-32 REVISION 1 i