ML20046B531

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Proposed Ts,Revising ANO Unit 1 Limiting Conditions for Operations,Surveillance Requirements,Bases for ECP & ANO Unit 2 Surveillance Requirements & Bases for ECP
ML20046B531
Person / Time
Site: Arkansas Nuclear  Entergy icon.png
Issue date: 07/28/1993
From:
ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20046B529 List:
References
NUDOCS 9308050059
Download: ML20046B531 (14)
v • d • e


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PROPOSED TECHNICAL SPECIFICATIONS CHANGES 4

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4 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< r inventory in the emergency cooling pond.

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

1. A minimum contained water volume of 70 acre-feet (equivalent to an indicated water level of 5 feet).
2. An average water temperature of s 100af.

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3.11.2 With the requirements of Specification 3.11.1 not satisfied, be in the hot shutdown condition within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in the cold shutdown condition within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

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 Dardanelle Reservoir.

The minimum water depth takes into account (1) water loss from evaporation due to heat load and climatological conditions, (2) pond bottom irregularities. (3) suction pipe level at the pond and (4) operator action in transferring the service water system from the Dardanelle Reservoir.

The values are based on worst case initial conditions which 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 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 current ef fects throughout the pond will essentially be at equilibrium conditions under initial stagnant conditions.

Amendment No. 13 66a l

4.13 EMERGENCY COOLING POND i

Applicability Applies to the emergency cooling pond.

Objective To verify the availability of a sufficient supply of cooling water inventory in the emergency cooling pond.

l Speci fi cati on 4.13.1 The emergency cooling pond shall be determined operable:

1. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the pond's indicated water level is 2 5 feet.

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2. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during the period from June 1 through September 30 by verifying that the pond's average water temperature at the point of discharge from the pond is within l

its limit.

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

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

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4. 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 i

covered embankments and the spillway:

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

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

Bases The requirements of Specification 4.13 provide for verification of a

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sufficient water inventory in the emergency cooling pond to handle a DBA with a concurrent f ailure of the Dardanelle Reservoir. 'This specification ensures that Specification 3.11.1 is met, Monitoring temperature only i

during the period June 1 through September 30 of each year ensures that.

l during the hot summer months the pond temperature limit is not exceeded.

j During 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 ECP temperature at the discharge from the pond 1s-considered a conservative i

average of total pond conditions since solar gain, wind speed, and thermal current effects throughout the pond will 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 apparent changes in visual appearance or other abnormal degradation to determine operability.

Amendment No. le 110a l

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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 j

t an 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 at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in CCLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REQUIREMENTS i

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

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a. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the pond's ' indicated water level is 2 5 feet.
b. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during the period of June 1.through September 30 by verifying that the pond's average water

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temperature at the point of discharge from the pond is within l.

t its 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'

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

ARKANSAS

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

I PLANT SYSTEMS BASES 3/4.7.2 STEAM GENERATOR PRESSURE / TEMPERATURE LIMITATION The limitation on steam generator pressure and temperature ensures that the pressure-induced stresses in the steam generators do,ot exceed the maximum allowable fracture toughness stress limits.

The limitations to 90*F and 275 psig are based on a steam generator RTNDT of 30*F-and are sufficient to prevent brittle fracture.

3/4.7.3 SERVICE WATER SYSTEM The OPERABILITY of the service water system ensures that sufficient cooling capacity is available for continund operation of equipment during normal and accident <

ditions.

The redundant cooling capacity of this system, assuming a failure, is consistent with the assumptions used in the accident ai vs 3/4.7.4 EMERGENCY COOLING POND The limitations on the emergency cooling pond level and temperature are based 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 ECP level is based on sounding to ensure a minimum contained water volume of 70 acre-feet.

These soundings ensure degradation is within 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 discharge from the pond is considered a conservative average of total pond conditions sir,ce solar gain, wind speed, and thermal current effects throughout the pond will 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 apparent changes in visual appearance or other abnormal degradation to determine operability.

1 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

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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 FILTRATION SYSTEM The OPERABILITY of the control room emergency air conditioning / air-filtration system ensures that 1) the ambient air temperature does not exceed the allowable temperature for continuous duty rating for the equipment and instrumentation cooled by this system and 2) the control i

i room will remain habitable for operations personnel during and ARKANSAS - UNIT 2

.B 3/4 7-4 Amendment No.

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MARKUP OF CURRENT ANO-1 TECHNICAL SPECIFICATIONS h

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a 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 emergency coo:ing pond 4sshall be operable whenever containment integrity is established 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.

l 3.11.2 With the requirements of Specification 3.11 1 not satisfied, be'in the hot shutdown condition within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in the cold shutdown condition within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

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 Dardanelle Reservoir.

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'in transferring the service water system from the Dardanelle Reservoir.

The -inimum wates depth and ma*4 mum aeter temperature correspond te conservative val' c used to-determine pond response and : ure the applicab-t'ity of the-salculational medel f o r pond ev aporat4ent l

The values are based 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 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 current effects throughout the pond will essentially be at equilibrium conditions under initial stagnant conditions.

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Amendment No. 44 66a l

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.

f Specification t

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

1. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> that the everage aster depth ic 2 3'0"by verifying the pond's indicated water level is 2 5 feet.
2. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during the period from June-1 tothrough l

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.

.i 4.13.2

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 volume s&-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 the concrete 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.

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abnormal degradation from their as built condition.

Bases i

The requirements of Specification 4.13 provide for verification of a 3

sufficient 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 l 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 of an 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 pond will 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 apparent changes in visual appearance or other abnormal degradation to determine operability.

Amendment No. 13 110a

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1 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 to an 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 at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REOUIREMENTS 4.7.4.1 The emergency cooling pond shall be determined OPERABLE:

a.

At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying the pond's indicated water level is 2 5 feet.

b.

At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> during the period of June I through September 30 by verifying that the pond's average water temperature at the point of discharge from the pond is within l

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its 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 j

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 l'

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 5

2.

Do not show apparent changes in visual appearance or other.

abnormal degradation from their as built condition.

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

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PLANT SYSTEMS BASES l

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 limitations 3

to 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 sufficient cooling capacity is available for continued operation of equipment during normal and accident conditions.

The redundant cooling capacity of this system, assuming a single failure, is consistent with the assumptions used in the accident analyses.

t 3/4.7.4 EMERGENCY COOLING POND l

The limitations on the emergency cooling pond level and temperature e

ensure that sufficient cccling c-apacity it available to either 1) provide normal cce4down of the f ac!144y, or 2) te -itigate the effects of accident conditiens u!th4n-assepteble '4mits are based on worst case initial conditions wh'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 f

water 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 j

discharge from the pond is considered a conservative average of total pond conditions since solar gain, wind speed, and thermal currents throughout the pond will essentially be at equilibrium conditions under initial stagnant conditions.

Visual inspections are performed to ensure any physical degradation is within i

acceptable 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 l

operability.

l 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 l

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 / air filtration system ensures that 1) the ambient air temperature does not a

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v exceed the allowable temperature for continuous duty rating for the equipment and instrumentation cooled by this system and 2) the control room will remain habitable for operations personnel during and 4

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

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