Text

Proposed Tech Specs,Supporting Operation of Units at Containment Air Temp Up to 120 F W/Lower Initial Refueling Water Storage Tank Water Vol
	ML20147F550
Person / Time
Site:	North Anna
Issue date:	03/02/1988
From:	; VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	;
Shared Package
ML20147F540	List: ML20147F534; ML20147F550; ML20147F562;
References
	NUDOCS 8803070376
	Download: ML20147F550 (20)
	v • d • e

_

'y , - ' 2 k I A r t 1 L -EMERGENCY CORE-COOLING SYSTEMS

=' - REFUELING-WATER STORAGE TANKI LIMITING CONDITION FOR OPERATION 3.5.5 The refueling waterEstorage tank (RWST) shall be OPERABLE with:

a. -A contained .barated ~ water volume of' b'etween - 466,200 and 487,000 gallons, l-

b '. . Between 2300 and 2400 ppm of boron, and c.- A-solution temperature between 40*F and 50*F.

- APPLICABILITY: . MCTdd 1, 2, 3 - and 4.

ACTION:

With the. refueling-water storage tank inoperable, restore the tank to OPERABLE status within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months or be in at 1 east HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in

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COLD SHUTDOWN within the-following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.5.5- The RWST shall be demonstrated OPERABLE:

s. 'At least once per 7 days by:

1. Verifying.the contained borated water volume.in the. tank, and

.2. Verifying the' boron concentration of the water.

t b, At least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months by verifying the RWST temperature.

NORTH ANNA - UNIT 1 3/4 5-9

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CONTAINMENT SYSTEMS' CONTAINMENT LEAKAGE LIMITING CONDITION FOR OPERATION 3.6.1.2. Containment leakage rates shall be limited to:

m a.- An overall integrated leakage rate of:

1. s L 0.1 percent by weight of.the containment air per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months at P,, S,44.1 psig, or

~b. A combined leakage' rate of s 0.60 L for, all penetrations and valves s

subject to Type B and C tests, when pressurized to P,, 2 44.1 psig.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

With either (a) the measured overall integrated containment leakage rate exceeding 0.75 L or -(b) with the measured combined leakage rate for all penetrations and a

valves subject to Type B and C tests exceeeding 0.60 L , restore-the' leakage rate (s) to within the limit (s) prior to increasing- the Re$ctor Coolant System temperature above 200*F.

SURVEILLANCE REQUIREMENTS -4.6.1.2 The containment leakage rates shall be demonstrated at the following test schedule and shall be determined in conformance with the criteria specified in Appendix J of 10 CFR 50 using the methods and provisions of ANSI N45.4-1972:

a. Three Type A tests (Overall Integrated Containment Leakage Rate) shall be conducted at 401 10 month intervals during shutdown at P d 44.1 psig during each 10-year service period. The third test of each set shall be conducted during the shutdown for the 10-year plant inservice inspection.

NORTH ANNA - UNIT 1 3/4 6-2

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CONTAINMENT SYSTEMS

'SURVEILLAUCE REQUIREMENTS-(Continued)

b. If any periodic. Type A' test fails.to meet .75 L the test schedule for '

subsequent Type A tests shall be reviewed $nd.-approved by the Commission. If two consecutive Type A tests fail to meet .75 L a Type-

' A testJ shall be performed at least every 18 months until two consecutive Type A tests meet .75 L, at which time the above test schedule may be resumed.

c. The accuracy of each Type A test shall be verified .by a supplemental test which:

1. Confirms the accuracy of the Type A test by verifying that the difference between supplemental and Type A test data is within 0.25 L,.

2. Has a duration sufficient to establish accurately the change in leakage between the Type A test and the supplemental test.

3. Requires the quanitity of gas injected into the containment or bled from the containment during the supplemental test to be equivalent '

to at least 25 percent of the total measured leakage rate .at P 2 a

44.1 psig,

d. Type B and C tests shall be conducted with gas at P 2 44.1 psig, at intervals no greater than 24 months except for tests i$v,olving:

1. Air locks,

2. Penetrations using continuous leakage monitoring systems t

e. Air locks shall be tested and demonstrated OPERABLE per Surveillance Requirement 4.6.1.3.

f. Type B test foc penetrations employing a continuous leakage monitoring system shall be conducted at P, 2 44.1 psig at intervals no greater than once per 3 years.

g. All test leakage rates shall be calculated using observed data converted to absolute values. Error analyses shall be performed to select a balanced integrated leakage measurement system.

h. The provisions of Specification 4.0.2 are not. applicable.

NORTH ANNA - UNIT 1 3/4 6-3

CONTAINMENT SYSTEMS CONTAINMENT AIR LOCKS LIMITING CONb1 TION FOR OPERATION 3.6.1.3 Each containment air lock shall be OPERABLE with:

a. Both doors closed except when the air lock is being used for normal transit entry and exit through the containment, then at least one air lock door shall be closed, and

b. An overall air lock leakage rate of less than or equal to 0.05 L at P greater than or equal to 44.1 psig.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

a. With one containment air lock door inoperable:

1. Maintain at least the OPERABLE air lock door closed and either restore the inoperable air lock door to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or lock the OPERABLE air lock door closed.+

2. Operation may then continue until performance of the next required overall air lock leakage test provided that the OPERABLE air lock door is verified to be locked closed at least once per 31 days.

3. Otherwise, be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

4. The provisions of Specification 3.0.4 are not applicable,

b. With a containment air lock inoperable, except as the result of an inoperable air lock door, maintain at least one air lock door closed; restore the inopercble air lock to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD shutcown within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REOUIREMENTS 4.6.1.3 Each containment air lock shall be demonstrated OPERABLE:

a. *Within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months following closing, except when the air lock is being used for multiple entries, then at least once per 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , by verifying that the seal leakage is less than 0.01 L as determined by precision flow measurements when mear,ured for at 1$ast 30 seconds with the volume between the seals at a pressure of greater than or equal to 44.1 psig.

b. At least once per 6 months by conducting an overall air lock leakage test at greater than or equal to P , 44.1 psig, and by verifying that the overall air lock leakage rate is within its limit #, and

c. At least once per 18 months during shutdown by verifying that only one door in each air lock can be opened at a time.

+ Entry to repair the inner air lock door, if inoperable, is allowed.

Exempt to Appendix "J" of 10 CFR 50.

The provisions of Specification 4.0.2 are not applicable.

NORTH ANNA - UNIT 1 3/4 6-4

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CONTAINMENT SYSTEMS INTERNAL PRESSURE LIMITING CONDITION FOR OPERATION 3.6.1.4 LPrimary, containment internal' air partial pressure shall be maintained -

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2 9.0 psia and within the. acceptable-operation region on Figure 3.6-1.

-APPLICABILITY: MODES 1,'2,',3 e

4.

ACTION:

With the containment internal air pa.-tial pressure < 9.0 psia or above .the applicable;-limit shown on Figure 3.6-1, restore the' internal air partial pressure to within the limits within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months or be in at ~least HOT STANDBY within:the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the fo11owing'30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.6.1.4~. The primary containment - internal air partial pressure shall be

-determined to be-within the limits at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

NORTH ANNA , UNIT 1 3/4 6-5 e

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C.JNTAINMDIT ' SYSTEMS AIR TEMPERATURE x

LIMITING ^ CONDITION FOR~0PERATION 3.6.1.5 l Primary -containment . average air temperature shall-be maintained 2 86'F

-and 5 120*T'

.APPLICABIL'ITY - MODES, 1- 2, 3 and 4.

ACTION:

With the containment average air temperature > .120'F .or < 86*F, restore. the average _ air temperature to within the limit within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months or be in at least HOT

'y' STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

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SURVEILLANCE REQUIREMENTS v- . . . .

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_. 4. 6.1. 5.1 The primary containment average mir temperature shall be the weighted ave: age of at least the minimum number _of temperatures _at the following locationc-a and shall be determined a: least once per 24 hones:

Min. No. of Location Weight Factor (WF', Temperature

,, a. Containment dome Elev. 390 0.09604 1

b. .Inside crane wall Eles 329 0.04846- 2

c. Annulus- Elev. 329 0.02256 2

d. Annulus Elev. 238 0.04972 1

e. Cubicles Elev. 268 0.06785 (.07513)* 2

'4.6.1.5.2 The average containment air temperatura shall be determined by the following rols ' < ahip:

T cgp. 1.0 where

,t = _T_; p ]

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th k .L. ><- factor for the temperature T g, of the i te6;eresa.. + ement.

'n 2 ' factor to be used for pressurizer cubicle at Elev. 26 .

'ND-:d ANNA - UNIT 1 3/4 6-7

EMERGENCY CORE COOLING SYSTEMS EASES 3/4.5.5 REFUELING WATER STORAGE TANK The OPERABILITY of the RWST as part of the ECCS ensures that a sufficient supply of borated water is available for injection by the ECCS in the event of a LOCA.

The limits on RWST minimum volume and bo ou concentration ensure that 1) sufficient water is available within containmen: to parmit recirculation cooling flow to the core, and 2) the reactor will remais suberitiu . 1 in the cold condition following mixing of the RWST and the RCS vater volumes with all control rods inserted except for the most reactive control assembly. These assumptions are consistent with the LOCA analyses.

The contained water volume limit includes an allowance for water not usable because of tank discharge line location or other physical characteristics.

The limits on contained water volume and boron concentration of the RWST also ensure a pH value of betwee- 8.5 and 11.0 for quench spray and between 7.7 and 9.0 for the solution recircu_ated within the containment after a LOCA. This pH minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

An RWST wide range level instrument loop uncertainty was included in the safety analysis and therefore need not be considered by the operator.

NORTH ANNA - UNIT 1 B 3/4 5-3 ,

CONTAINMENT SYSTEMS BASES

) That the peak clad fuel temperature will remain less than 2200*F for a LOCA and

3) That for either a LOCA or MSLB:

a) The peak containment pressure will be limited to the upper containment design pressure of 45 psig.

b) The containment internal pressure can be returned subatmospheric within 60 minutes, and c) Safety related equipment within the containment will not experience temperatures greater than those to which they have previously been qualified.

d) It is a design criteria that the containment internal pressure remain subatmospheric after 60 minutes.

The limits shown in Figure 3.6-1 and Specification 3.6.1.5 are consistent with the assumptions of the accident analyses which included consideration of instrument loop uncertainties.

3/4.6.1.6 CONTAINMENT STRUCTURAL INTEGRITY This limitation ensures that the structurit futegrity of the containment will be maintained co.s. rabic to the original design standards for the life of the facility. Structural integrity is required to ensure that the containment will withstand the maximum pressure in the event of a LOCA. The visual examination of the concrete and liner and the Type A leakage tests are sufficient to demonstrate this capability.

3/4.6.2 DEPRESSURIZATION AND COOLING SYSTEMS _

3/4.6.2.1 and 3/4.6.2.2 CONTAINMENT QUENCH AND RECIRCULATION SPRAY SYSTEMS The OPERABILITY of the containment spray systems ensures that containment depressurization and subsequent return to aubatmospheric pressure will occur in the evenc of a LOCA. The pressure reduction and resultant term' nation of containment Icakage are consistent with the assumptions used in the accident analyses.

NORTH ANNA - UNIT 1 B 3/4 6-2

i Attachment 2 Proposed Technical Specification Changes - Unit 2 i

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l EMERGENCY CORE COOLING SYSTEMS REFUELING WATER STORAGE TANK LIMITING C0h;DITION FOR OPERATION 3.5.5 The refueling water storage tank (RWST) shall be OPERABLE with:

a. A contained borated water volume of between 466,200 and 487,000 gallons.

b. Between 2300 and 2400 ppm of boron, and

c. A solution temperature between 40*F and 50*F.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

With the refueling water storage tank inoperable, restore the tank to OPERABLE status within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months or be in at least HOT STANDBY within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.5.5 The RWST shall be demonstrated OPERABLE:

a. At least once per 7 days by:

1. Verifying the contained borated water volume in the tank, and

2. Verifying the boron concentration of the water.

b. At least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months by verifying the RWST temperature.

NORTH ANNA - UNIT 2 3/4 5-10

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CONTAINMENT LEAKAGE-s -

LIMITING CONDITION FOR OPERATION. -

3.6.1.2 JContainment leakage rates shall be limited to:

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a.- An overall. integrated leakage rate of:

'1. 0.1 percent by weight of the containment air per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months at

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sL P,,a,:44,1 t psig, or

b. -A combined leakage rate of s 0.60 L for all penetretions and valves subject to Type B and C tests, whena pressurized to P,, 2 44.1 psig. .

APPLICABILITY: MODES 1. 2, 3 and 4.

ACTION:

With either (a) the measured overall integrated containment leakage rate exceeding 0.75 L or (b) with the measured combined leakage rate for all penetrations an8 valves subject to Type B and C tests exceeding 0.60 L ,

restore the overall integrated leakage rats to less than 0.75 L and t$e ,

combined leakage rate for all penetratfor, subject to Type B'and"C tests to '

less than or equal to 0.60 L* prior to increasing the Reactor Coolant System :

temperature above 200'F. <

h SURVEILLANCE REQUIREMENTS

'4.6.1.2 The containment leakage rates shall be demonstrated at the folicwing test schedule and shall be determined in conformance with the criteria 7 specified in Appendix J of 10 CFR 50 using the methods and provisions of ANSI N45.4-1972: j

a. Three Type A tests (Overall Integrated Containment Leakage Rate) shall -

be conducted at 40 + 10 month intervals during shutdown at P , 2 44.1 psig, during each 10 ! year service period. The third test of Sach set shall be conducted during the shutdown for the 10-year plant inservice inspection.

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C NNTH P.NNA - UNIT 2 3/4 6-2

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o CONTAINMENT SYSTEMS SURVEILLANCE REQUIIM.NTS (Continued)

b. If .any . periodic Type A test fails to meet .75 L the test schedule for subsequent Type A- tests shall be reviewed $nd approved by the Commission. If two consecutive Type A tests fail to meet .75 L a Type A test shall be performed at least every 18 months until two consecutive

. Type' A tests meet .75 L, at which time the above test schedule may be resumed.

c. The' accuracy of each Type A test shall be verified by a supplemental test which:

1. Confirms the accuracy. of the -Type A test by verifying that the difference between supplemental and Type A test data is within 0.25 L,

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2. Has a duration sufficient to establish accurately the change in leakage between the Type A test and the supplemental test.

, 3. Requires the quantity of gas' injected into the containment or bled from the containment during the supplemental test to be equivalent '

to at least 25 percent of the total measured leakage rate at P, 2 a

44.1 psig,

d. Type B and C tests shall be conducted with gas at P 2 44.1 psig, at intervals no greater than 24 months except for tests 18v,olving: '

1. Air locks,

2. Penetrations using continuous leakage monitoring systems

e. Air locks shall be tested and demonstrated OPERABLE per Surveillance Requirement 4.6.1.3.

f. Type B test for penetrations employing a continuous leakage monitoring system shall be conducted at P , 2 44.1 psig, at intervals no greater than once per 3 years.

g. All test leakage rates shall be calculated using observed data converted to obsolute values. Error analyses shall be performed to select e ;

balanced integrated leakage measurement system.

h. The provisions of Specification 4.0.2 are not applicable.

NORTH ANNA - UNIT 2 3/4 6-3 e

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CONTAINMENT SYSTEMS

- CONTAINMENT AIR LOCKS

- LIMITING CONDITION FOR OPERATION 3.6.1.3 :Each containment' air lock shall be OPERABLE with:

a. Both ' doors closed except when the air lock is being used for normal transit entry and exit through the containment, then at least one air lock door shall be closed,_and

b. An'overall air lock leakage. rate of less than or~ equal to 0.05 L at P ,

a a 2 44.1 psig.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:-

a. With one containment air lock door inoperable:

1. Maintain at'least the OPERABLE air lock door closed and either restore the inoperable air. lock door to OPERABLE status within 24-hours or lock the OPERABLE air lock door closed.+

2. Operation may then continue until performance of the next required overall air lock leakage test provided that the OPERABLE air lock-door is verified to be locked closed at least once per 31 days.

3~. Otherwise, be in at least HOT STANDBY vithin the next 6. hours and_in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

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4. The provisions of Specification 3.0.4 are not applicable.

,, b. With a containment air lock inoperable, except as the result of an inoperable air lock door, maintain at least one air lock door closed; restore the inoperable air lock to OPERABLE status within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months or be in at least HO? STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.6.1.3 Each containment air lock t'iall be demonstrated OPERABLE:

a. *Vithin 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months following closing, except when the air lock is being used for multiple entries, then at least once per 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months , by verifying that the seal leakage is less than 0.01 L as determined by precision flow measurements when measured for at least 30 seconds with the volume between the seals at a pressure of greater than or equal to 44.1 psig.

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+ Entry to repair the inner air lock door, if inoperable, is allowed.

Exempt to Appendix "J" of 10 CFR 50.

NORTE Anna - UNIT 2 3/4 6-4 r

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e CONTAINMENT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

b. At least once per 6 months by conducting an overall air lock leakage test at greater than or equal to P 44.1 psig, and by verifying that the overall air lock leakage rate is, within its limiti, and

c. At least once per 18 months during shutdown by verifying that only one door in each air lock can be opened at a time.

The provisions of Specification 4.0.2 are not applicable.

NORTH ANNA - UNIT 2 3/4 6-5

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"- CONTAINMENT SYSTEMS t ^=.

INTERNAL PRESSURE LIMITING CONDITION FOR OPERATION

- 3.6.1.4

Primary containment internal air partial pressure shall be maintained 2.9.0 psia and;within the acceptable operation region on Figure-3.6-1.

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APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

With 'the containment internal air partial pressure < 9.0 psia or above the applicable limit shown on Figure- 3.6-1, restore the internal air partial' pressure, to within the limits. within I hour or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SRUTDOWN within thel following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.6.1.4 The primary containment internal air partial pressure shall be determined to be vithin the limits at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

NORTH ANNA - UNIT 2 3/4 6-6

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CONTAINMENT SYSTEMS AIR TEMPERATURE LIMITING CONDITION FOR OPERATION 3.6.1.5 Frimary containment average air temperature shall be maintained 2 86*F and s 120'F.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

With the containment average- air temperature > 120*F or < 86'F, restore the average air temperature to within the limit within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months or be in at least 110T STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.6.1.5.1 The primary containment average air temperature shall be the weighted average of at least the minimum number of temperatures at the following locations and shall be determined at least once per 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months s:

Min. No. of Location Weight Factor (WF) Temperature

a. Containment dome Elev. 390 0.04789 1

b. Inside crane wall Elev. 329 0.09373 2

c. Annulus Elev. 329 0.02283 (0.02935)* 2

d. Annulus Elev. 238 0.08309 1

e. Cubicles Elev. 268 ** 1 4.6.1.5.2 The average containment air temperature shall be determined by the following relationship:

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[n WFg]

I T i

WF g is the weight factor for the temperature T g of the i temperature measurement.

Weight factor to be used for pressurizer cubicle at Elev. 268.

- Weight factor to be used for cubicles A=0.03932 B-0.03597, C=0.03619 NORTH ANNA - UNIT 2 3/4 6-8

i EMERGENCY CORE COOLING SYSTEMS BASES 3/425.5 REFUELING WATER STORAGE TANK The 0PERABILITY.of the RWST as part of the ECCS ensures that a sufficient ~ supply

.of borated water is avi.11able for injection by the ECCS in the event of a LOCA.

-The limits on 1 RWST minimum volume and boron concentration ensure that. 1) sufficient water is available within containment to permit recirculation cooling flow to the core, and 2) the reactor will remain suberitical in the cold condition

- following mixing of -the RWST and the RCS water volumes with all control rods-inserted except for the most reactive control assembly. These assumptions are consistent with the LOCA analyses.

The contained water volume limit includes an allowance for water not. usable-because of tank discharge line location or other physical characteristics.

The limits on-contained water volume and boron concentration of the RWST also ensure a pH value of between 8.5 and 11.0 for quench spray and between 7.7 and 9.0 for tha solution recirculated within the containment after a LOCA. This pH minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

- An RWST wide range level instrument loop uncertainty was inc1.uded in- the safaty analysis and therefore need not be considered by the operator.

NORTH ANNA - UNIT 2 B 3/4 5-3

. - J

CONTAINMENT SYSTEMS BASES

1) The containment pressure is prevented from reaching the containment lower design pressure of 5.5 psia for an inadvertent containment spray actuation,

2) That the peak clad fuel temperature will remain less than 2200*F for a LOCA and

3) That for either a LOCA or MSLB:

a) The peak containment pressure will be limited to the upper containment design pressure of 45 psig.

b) The containment internal pressure can be returned subatmospheric within 60 minutes, and c) Safety related equipment within the containment will not experience temperatures greater than those to which they have previously been qualified. -

d) It is a design criteria that the containment internal pressure remain subatmospheric after 60 minutes.

The limits shown in Figure 3.6-1 and Specification 3.6.1.5 are consistent with the assumptions of the accident analyses which included consideration of instrument loop uncertainties.

3/4.6.1.6 CONTAINMENT STRUCTURAL INTEGRITY This limitation ensures that the structural integrity of the containment will be maintained comparable to the original design standards for the life of the facility. Structural integrity is required to ensure that the containment will withstand the maximum pressure in the event of a LOCA. The visual examination of the concrete and liner and the Type A leakage tests are sufficient to demonstrate this capability.

NORTH ANNA - UNIT 2 B 3/4 6-2

ML20147F550

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