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3.11 EMERGENCY COOLING POND

Applicabii'ty

Applies to the emergency cooling pond.

Objective

To assure the availability of a sufficient supply of cooling wat< rinventory in the emergency cooling pond.

Specification

3.11.1 The emergency cooling pond shall be operable whenever containmentintegrity is established as required by Specification 3.6.1 with:

1. A minimum contained water volume of 70 acre-feet (equivalentto an indicated water level of 5 feet).

2. An average water temperature of s 100af. |t

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| 3.11.2 With the requirements of Specification 3.11.1 not satisfied, bein the hot shutdown condition within 6 hours and in the coldshutdown condition within the following 30 hours.

Bases

The requirements of Specification 3.11.1 provide for sufficient waterinventory in the emergency cooling pond to mitigate within acceptablelimits the effects of a DBA with a concurrent failure of the DardanelleReservoir. The minimum water depth takes into account (1) water lossfrom evaporation due to heat load and climatological conditions, (2) pondbottom irregularities. (3) suction pipe level at the pond and (4) operatoraction in transferring the service water system from the Dardanelle Reservoir.

The values are based on worst case initial conditions which could be presentconsidering a simultaneous normal shutdown of Unit I and emergency shutdownof Unit 2 following a LOCA in Unit 2. using the ECP as a heat sink. Themeasured ECP temperature at the discharge from the pond is considered aconservative average of total pond conditions since solar gain, wind. speed,and thermal current ef fects throughout the pond will essentially be atequilibrium conditions under initial stagnant conditions.

Amendment No. 13 66a |

___ . _ _ . . ._ _. . . . _

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4.13 EMERGENCY COOLING POND i

Applicability '

Applies to the emergency cooling pond.

Objective,

To verify the availability of a sufficient supply of cooling waterinventory in the emergency cooling pond. |

*

Speci fi cati on

4.13.1 The emergency cooling pond shall be determined operable: ;

1. At least once per 24 hours by verifying the pond's indicatedwater level is 2 5 feet. f

2. At least once per 24 hours during the period from June 1 through :

September 30 by verifying that the pond's average watertemperature at the point of discharge from the pond is within,

| its limit.

3. At least once per 12 months by making soundings of the pond and | ,

verifying an average depth of 5 feet and that the contained watervolume of the pond is within its limit. 1

f4. At least once per 12 months by a visual inspection of the loosestone (riprap).placed on the banks of the pond and of the concrete !

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slab spillway and verifying that the earth portions of the stone icovered embankments and the spillway: t

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1. Have not been eroded or undercut by wave action,.and -|'

2. Do not show apparent changes in visual appearance or other ,

abnormal degradation from their as built condition. ;

Bases ,

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The requirements of Specification 4.13 provide for verification of a [sufficient water inventory in the emergency cooling pond to handle a DBAwith a concurrent f ailure of the Dardanelle Reservoir. 'This specification _iensures that Specification 3.11.1 is met, Monitoring temperature only iduring the period June 1 through September 30 of each year ensures that. | ,

during the hot summer months the pond temperature limit is not exceeded. jDuring other periods of the year the pond temperature will not have the ;

potential to reach the temperature limit. Soundings are performed to ensure j

the water volume is within limits and that.the indicated level is indicative ;

of an equivalent water volume for accident mitigation. The measured ECPtemperature at the discharge from the pond 1s-considered a conservative i

average of total pond conditions since solar gain, wind speed, and thermalcurrent effects throughout the pond will essentially be at equilibriumconditions under initial stagnant conditions. Visual inspections areperformed to ensure any physical degradation is within acceptable limits toenable the ECP to fulfill its safety function. An engineering evaluation shall,

be performed by a qualified engineer of any apparent changes in visualappearance or other abnormal degradation to determine operability.

Amendment No. le 110a |

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PLANT SYSTEMS

3/4.7.4 EMERGENCY COOLING POND

LIMITING CONDITION FOR OPERATION f

3.7.4.1 The emergency cooling pond shall be OPERABLE with:

a. A minimum contained water volume of 70 acre-feet (equivalent to jtan indicated water level of 5 feet).

b. An average water temperature of s 100*F.

APPLICABILITY : MODES 1, 2, 3 and 4.

ACTION:

With the requirements of the above specification not satisfied, be in atleast HOT STANDBY within 6 hours and in CCLD SHUTDOWN within the following

'30 hours.'

SURVEILLANCE REQUIREMENTSi

4.7.4.I The emergency cooling pond shall be determined OPERABLE: I

a. At least once per 24 hours by verifying the pond's ' indicatedwater level is 2 5 feet.

b. At least once per 24 hours during the period of June 1.throughSeptember 30 by verifying that the pond's average water +

temperature at the point of discharge from the pond is within |. ,

tits limit.

c. At least once per 12 months by making soundings of the pond and ,

verifying an average depth of 5 feet and that the contained water >

volume of the pond is within its limit. !

d. At least once per 12 months by a visual inspection of the loose !stone (riprap) placed on the banks of the pond and of the ;

concrete slab spillway and verifying that the earth portions of ,

the stone covered embankments and the spillway:

1. Have not been eroded or undercut by wave action, and'

] 2. Do not show apparent changes in visual appearance or other |abnormal degradation from their as built condition, q

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ARKANSAS . UNIT 2 3/4 7-16 Amendment No.

- _ _ . .-- _. ._ - . - - - - _ .- . . . -

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PLANT SYSTEMS ;

BASES

3/4.7.2 STEAM GENERATOR PRESSURE / TEMPERATURE LIMITATION

The limitation on steam generator pressure and temperature ensuresthat the pressure-induced stresses in the steam generators do ,ot exceedthe maximum allowable fracture toughness stress limits. The limitationsto 90*F and 275 psig are based on a steam generator RTNDT of 30*F- and aresufficient to prevent brittle fracture.

3/4.7.3 SERVICE WATER SYSTEM,

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The OPERABILITY of the service water system ensures that sufficientcooling capacity is available for continund operation of equipment duringnormal and accident < ditions. The redundant cooling capacity of thissystem, assuming a failure, is consistent with the assumptions usedin the accident ai vs

3/4.7.4 EMERGENCY COOLING POND

The limitations on the emergency cooling pond level and temperature arebased on worst case initial conditions which could be present considering ;

a simultaneous normal shutdown of Unit 1 and emergency shutdown of' Unit 2-'

following a LOCA in Unit 2, using the ECP as a heat sink. The indicated ECPlevel is based on sounding to ensure a minimum contained water volume of 70 :acre-feet. These soundings ensure degradation is within acceptable limitssuch that the indicated level is consistent with the required volume and thepond meets its design basis. The measured ECP temperature at the dischargefrom the pond is considered a conservative average of total pond conditionssir,ce solar gain, wind speed, and thermal current effects throughout the pondwill essentially be at equilibrium conditions under initial stagnant conditions.Visual inspections are performed to ensure any physical degradation is withinacceptable limits to enable the ECP to fulfill its safety function. Anengineering evaluation shall be performed by a qualified engineer of anyapparent changes in visual appearance or other abnormal degradation todetermine operability.

1'

The limitations on minimum water level and maximum temperature arebased on providing a 30 day cooling water supply to safety-related ;

equipment without exceeding their design basis temperature and:is }consistent with the recommendations of Regulatory Guide 1.27, " Ultimate ;

Heat Sink for Nuclear Plants", March 1974. ;

'3/4.7.5 FLOOD PROTECTION

,

The limitation on flood protection ensures that f acility protective'

actions will be taken in the event of flood conditions.

3/4.7.6 CONTROL ROOM EMERGENCY AIR CONDITIONING / AIR FILTRATIONSYSTEM

:

The OPERABILITY of the control room emergency air conditioning / air-filtration system ensures that 1) the ambient air temperature does notexceed the allowable temperature for continuous duty rating for theequipment and instrumentation cooled by this system and 2) the control i

iroom will remain habitable for operations personnel during and

ARKANSAS - UNIT 2 .B 3/4 7-4 Amendment No.;

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3.11 EMERGENCY COOLING POND

Applicability

Applies to the emergency cooling pond.i

Objective,

To assure the availability of a sufficient supply of cooling water i

inventory in the emergency cooling pond.

Specification

3.11.1 The reactor chal' net be taker criticel unlet the emergencycoo:ing pond 4sshall be operable whenever containment integrity isestablished as required by Specific.ation 3.6.1 with: .

1. An average 4 ter depth 2 3'0", and minimum contained water volume of L

70 acre-feet (equivalent to an indicated water level of 5 feet). !

2. An average water temperature of s 1050 F. | !

'

3.11.2 With the requirements of Specification 3.11 1 not satisfied, be'in'the hot shutdown condition within 6 hours and in the cold shutdown

condition within the following 30 hours..

'Bases

The requirements of Specification 3.11.1 provide for sufficient water-inventory in the emergency cooling pond to mitigate within acceptable !

limits the effects of a DBA with a concurrent failure of the DardanelleReservoir. The minimum water depth takes into accou1t (1) water loss from .

evaporation due to heat load and climatological cond'tions, (2) pond bottom !

irregularities, and-(3) suction pipe level at the por.d and (4) operator action'intransferring the service water system from the Dardanelle Reservoir. The -inimumwates depth and ma*4 mum aeter temperature correspond te conservative val' c usedto-determine pond response and : ure the applicab-t'ity of the-salculational medel f o r pond ev aporat4ent

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The values are based on worst case initial conditions which could be presentconsidering a simultaneous normal shutdown of Unit 1 and emergency shutdownof Unit 2 following a LOCA in Unit 2, using the ECP as a heat sink. Themeasured ECP temperature at the discharge from the pond is considered aconservative average of total pond conditions since solar gain, wind speed,and thermal current effects throughout the pond will essentially be atequilibrium conditions under initial stagnant conditions.

|

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f Amendment No. 44 66a |

__. - - . - . . - _

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4.13 EMERGENCY COOLING POND

Applicability

:Applies to the emergency cooling pond. ,

Objective

To verify the availability of a sufficient supply of cooling water i

inventory in the emergency cooling pond. :

fSpecification ;

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4.13.1 The emergency cooling pond shall be determined operable-byverify!.g:

'

1. At least once per 24 hours that the everage aster depth ic 23'0"by verifying the pond's indicated water level is 2 5 feet.

2. At least once per 24 hours during the period from June- 1 tothrough |September 30 by verifying that the pond's average water temperature i

at the point of discharge from the pond is 6-1G5Ewithin its limit.

.i4.13.2 3. At least once per 12 months by making & soundings chel' be made ;

annu+44y of the emergency cecling pond bettom te ensure that the r-equired volumes&-water is eve!1:51eand verifying an average depth of 5 feet and that the ,

contained water volume of the pond is within its limit.

4. At least once per 12 months by a visual inspection of _ the loose i

stone (riprap) placed en the banks of the pond and of theconcrete slab. spillway and verifying that the earth portions of i

the stone covered embankments and the spillway:;

1. Have not been eroded or undercut by wave action, and.

2. Do not show apparent changes in visual appearance or other. j!abnormal degradation from their as built condition.

,

Basesi

The requirements of Specification 4.13 provide for verification of a 3sufficient water inventory in the emergency cooling pond to handle a DBA

,

with a concurrent failure of the Dardanelle Reservoir. This specification !ensures that Specification 3.11.1 is met. Monitoring temperature only I

during the period June 1 tethrough September 30 of each year ensures that during |the hot summer months, the pond temperature limit is not exceeded. During :other periods of the year the pond temperature will not have the potential

,

to reach the temperatures near 10EFlimit. Soundings are performed to ensure the '

'water volume is within limits and that the indicated level is indicative ofan equivalent water volume for accident mitigation. The measured ECP temperature ,

at the discharge from the pond is considered a conservative average of total pond ;

conditions since solar gain, wind _ speed, and thermal currents throughout the pondwill essentially be at equilibrium conditions under initial stagnant conditions.

.

"-

Visual inspections are performed to ensure any physical degradation is within.acceptable limits to enable the ECP to fulfill its safety function. An ;

engineering evaluation shall be performed by a qualified engineer of any apparentchanges in visual appearance or other abnormal degradation to determineoperability.Amendment No. 13 110a

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PLANT SYSTEMS

3/4.7.4 EMERGENCY COOLING POND

LIMITING CONDITION FOR OPERATION

3.7.4.1 The emergency cooling pond shall be OPERABLE with:

a. A minimum contained water volume of 70 acre-feet (equivalent toan indicated water level of 5 feet).

b. An average water temperature of s 100'F.'

APPLICABILITY : MODES 1. 2, 3 and 4.

ACTION:

With the requirements of the above specification not satisfied, be in atleast HOT STANDBY within 6 hours and in COLD SHUTDOWN within the following30 hours.

,

; SURVEILLANCE REOUIREMENTS

:'

4.7.4.1 The emergency cooling pond shall be determined OPERABLE:

a. At least once per 24 hours by verifying the pond's indicatedwater level is 2 5 feet.

b. At least once per 24 hours during the period of June I throughSeptember 30 by verifying that the pond's average watertemperature at the point of discharge from the pond is within | [

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its limit.

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c. At least once per 12 months by making soundings of the pond and ,

verifying an average depth of 5 feet and that the contained water jvolume of the pond is within its limit.

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d. At least once per 12 months by a visual inspection of the loosestone (riprap) placed on the banks of the pond and of the |'concrete slab spillway and verifying that the earth portions ofthe stone covered embankments and the spillway:

1. Have not been eroded or undercut by wave action and5

2. Do not show apparent changes in visual appearance or other. '

abnormal degradation from their as built condition.3

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ARKANSAS - UNIT 2 3/4 7-16 Amendment No. |

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|3/4.7.2 STEAM GENERATOR PRESSJRE/ TEMPERATURE LIMITATION

i'The limitation on steam generator pressure and temperature ensures

that the pressure-induced stresses in the steam generators do not exceed ;

the maximum allowable fracture toughness stress limits. The limitations3to 90*F and 275 psig are based on a steam generator RTNDT of 30aF and are

sufficient to prevent brittle fracture.

3/4.7.3 SERVICE WATER SYSTEM i

The OPERABILITY of the service water system ensures that sufficientcooling capacity is available for continued operation of equipment during

;

normal and accident conditions. The redundant cooling capacity of thissystem, assuming a single failure, is consistent with the assumptions used ;

in the accident analyses. t

3/4.7.4 EMERGENCY COOLING POND |:

The limitations on the emergency cooling pond level and temperature e

ensure that sufficient cccling c-apacity it available to either 1) providenormal cce4down of the f ac!144y, or 2) te -itigate the effects of accidentconditiens u!th4n-assepteble '4mits are based on worst case initial conditionswh'ch could be present considering a simultaneous normal shutdown of Unit I and'emergency shutdown of Unit 2 following a LOCA in Unit 2, using the ECP as a heat '

sink. The indicated ECP level is based on sounding to ensure a minimum contained fwater volume of 70 acre-feet. These soundings ensure degradation is within i

acceptable limits such that the indicated level is consistent with the required,

volume and the pond meets its design basis. The measured ECP temperature at the jdischarge from the pond is considered a conservative average of total pond

,

conditions since solar gain, wind speed, and thermal currents throughout the pondwill essentially be at equilibrium conditions under initial stagnant conditions.Visual inspections are performed to ensure any physical degradation is within iacceptable limits to enable the ECP to fulfill its safety function. S

,

engineering evaluation shall be performed by a qualified engineer of e , apparent :changes in visual appearance or other abnormal degradation to determine |operability. |

!

The limitations on minimum water level and maximum temperature are.

based on providing a 30-day cooling water supply to safety-related !

equipment without exceeding their design basis temperature and is,,

consistent with the recommendations of Regulatory Guide 1.27 " Ultimate |

Heat Sink for Nuclear-Plants", March 1974. f

'

3/4.7.5 FLOOD PROTECTION!

The limitation on flood protection ensures that facility protective !actions will be taken in the event of flood conditions.

L 3/4.7.6 CONTROL ROOM EMERGENCY AIR CONDITIONING / AIR FILTRATION i'

SY S T E _M__ ,

,

The OPERABILITY of the control room emergency air conditioning / airfiltration system ensures that 1) the ambient air temperature does not

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