Text

Proposed Tech Specs 3/4.1,3/4.5.4,3/4.9 & 3/4.10 Re Reactivity Control Sys,Boron Injection Sys,Refueling Operations & Special Test Exceptions,Respectively,Reducing Boron Concentrations in Boron Injection Tank
	ML20112A711
Person / Time
Site:	North Anna
Issue date:	03/11/1985
From:	; VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	;
Shared Package
ML20112A704	List: ML20112A702; ML20112A711;
References
	NUDOCS 8503180424
	Download: ML20112A711 (26)
	v • d • e

. _ . .

ATTACHl1ENT 2

' PROPOSED CHANGES TO TECHNICAL SPECIFICATIONS REDUCTION IN BORON CONCENTRATIONS FOR THE BIT AND BORIC ACID SYSTEM NORTH ANNA POWER STATION, UNIT 1

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3/4.1-REACTIVITY CONTROL SYSTEMS

-3/4.1.1'BORATION CONTROL ,

SHUTDOWN MARGIN - T ava LIMITING CONDITION FOR OPERATION

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3.1.1.1 The SHUTDOWN MARGIN shall be greater than or equal to 1.77%Ak/k.

APPLICABILITY: MODES 1, 2*, 3, and 4.

ACTION:- -

Withithe' SHUTDOWN MARGIN less than 1.77% delta k/k, immediately initiate and continue boration at greater than or equal to 10 gpm of 12.950 ppa boric acid solution or equivalent until the required SHUTDOWN MARGIN is restored. -

SURVEILLANCE REQUIREMENTS 4.1.1.1.1 The SHUTDOWN MARGIN shall be determined to be greater than or equal to-1.77% delta k/k:

a.. Within one hour after detection of an inoperable control rod (s) and at least once.per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter while the rod (s) is inoperable.

If.the inoperable control rod is immovable or untrippable,' the above required SHUTDOWN MARGIN shall be increased by an amount at

. least equa) .co the withdrawn worth of the immovable or untrippable control rod (s).

b.. When in MODES 1 or 2*, at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by verifying-that control bank withdrawai is within the limits of Specification i 3.1.3.6.

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c. .When in MODE 2 , within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months prior to achieving reactor ,

criticality by verifying that the-predicted critical control rod position is within-the limits of Specification 3.1.3.6.

See Special Test Exception 3.10.1 i With K,ff greater than or equal to 1.0 i

1. With eff less than 1.0 NORTH-ANNA - UNIT 1 3/4 1-1 1- ,

v .

REACTIVITY CONTPOL SYSTEMS

g , SHUTDOWN MARGIN - T,y, LESS THAN OR EQUALTO 200*F LIMITING CONDITION FOR OPERATION i.

3.1.1.2 The' SHUTDOWN MARGIN shall be greater than or equal to 1.77%'d Ita k/k.

APPLICABILITY: _ MODE 5.

ACTION:

With the SHUTDOWN MARGIN less than 1.77% delta k/k, immediately initiate and continue boration at greater than or equal to 10 gym of 12,950 ppa boric acid l' solution or equivalent until the required SHUTDOWN MARGIN is restored.

SURVEILLANCE REQUIREMENTS 4.1.1.2 The SHUTDOWN MARGIN shall be determined to be greater than or equal to 1.77% delta k/k:

a. Within one hour after detection of an inoperable control rod (s) and at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter while the rod (s) is inoperable.

) If the inoperable control rod is immovable or untrippable, the SHUTDOWN MARGIN shall be increased by an amount at least equal to the withdrawn worth of the immovsble or untrippable control rod (s).

b. At least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months by consideration of the following factors:

I t 1. Reactor coolant system boron concentration, 1

2. Control rod position,

3. Reactor coolant system average temperature,

, 4. Fuel bprnup based on gross thermal energy generation, 5.- Xenon concentration, and

6. Samarium concentration.

NORTH ANNA - UNIT 1 3/4 1-3

4 s' . i REACTIVITY CONTROL SYSTEMS YJ ,

3/4.1.2 BORATION SYSTEMS

, FLOW PATHS - SHUTDOWN LIMITING CONDITION FOR OPERATION

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3.1.2.1 As a minimum, one of the following boron injection flow paths shall be OPERABLE:

-a. A flow path from the boric acid tanks via.a boric acid transfer pump through a charging pump to the Reactor Coolant System if only the boric acid storage tank in Specification 3.1.2.7a is OPERABLE, or

b. The flow path from the. refueling water storage tank via a charging

pump to the Reactor Coolant System if only the refueling water ~

storage tank in Specification 3.1.2.7b is OPERABLE.

APPLICABILITY: MODES 5 and 6 ACTION:

With none of the above flow paths OPERABLE, suspend all operations involving CORE ALTERATIONS or positive' reactivity _ changes until at least one injection path is restored to OPERABLE status.

SURVEILLANCE REQUIREMENTS 1

4.1.2.1 At least one of the above required flow paths shall be demonstrated '

OPERABLE:L E

a. At least once per 7 days by verifying that the temperature of the heat traced portion of the flow path is greater than or equal to 115'T when a flow path from the boric acid tanks is used.

b. At least once per 31 days by verifying that each valve (manual, power operated or automatic) in the flow path that is not locked, sealed, or otherwise secured in position, is in its correct posi-l- tion.

l i NORTH ANNA - UNIT 1 3/4 1-8 l

REACTIVITY CONTROL SYSTEMS FLOW PATHS - OPERATING LIMITING CONDITION FOR OPERATION

.3.1.2.2 Each of the following boron injection flow paths shall be OPERABLE:

a.- The flow path from the boric acid tanks via a boric acid transfer pump and a charging pump to the Reactor Coolant System, and

b. The flow path from the refueling water storage tank via a charging i pump to the Reactor Coolant System.

APPLICABILITY: MODES 1, 2, 3 and 4 .

ACTION: -

a. With the flow path from the boric acid tanks inoperable, restore the inoperable flow path 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 STANDBY and borated to a SHUTDOWN MARGIN equivalent to at least 1.77% delta k/k at 200*F within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; restore the flow path to OPERABLE status within the next 7 days or be in COLD SHUTDOWN within the next 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With the flow path from the refueling water storage tank inoperable, restore the flow path to OPERABLE status within one 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 SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.1.2.2 Each of the above required flow paths shall be demonstrated OPERABLE:

a. At least once per 7 days by verifying that the temperature of the heat traced portion of the flow path from the boric acid tanks is greater than or equal to 115'F.

0nly one boron injection flow path is required to be OPERABLE whenever the temperature of one or more of the RCS cold legs is less than or equal to 320*F.

NORTH ANNA - UNIT 1 3/4 1-9 i

u - - - - _ . _ . -. - -- . - - -

REACTIVITY CONTROL SYSTEMS b

BORATED WATER SOURCES - SHUTDOWN LIMITING CONDITION FOR OPERATION 3.1.2.7 As a minimum, one of the following borated water sources shall be OPERABLE: l

a. A boric acid storage system and associated heat tracing with:-

1. A minimum contained borated water volume of 1378 gallons, l

2. Between 12,950 and 15,750 ppa of boron, and

3. A minimum solution temperature of 115'F.

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b. The refueling water storage tank with:

1. A minimum contained borated water volume of 51,000 gallons, a

2. Between 2000 and 2100 ppm of boron, and

3. A minimum solution temperature of 35'F.

APPLICABILITY: MODES 5 and 6 :

ACTION:

With no borated water source OPERABLE, suspend all operations involving CORE ALTERATIONS or positive reactivity changes until at least one borated water source-is restored to OPERABLE status.

SURVEILLANCE REQUIREMENTS 4.1.2.7 The above required borated water source shall be demonstrated OPERABLE:

a. At least once per 7 days by:

1. Verifying the boron concentration of the water, r

2.- Verifying the contained borated water volume of the tank, and i

3. Verifying the boric acid storage tank solution temperature when it is the source of borated 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 when it is the source of borated water and the outside air temperature is less than 35'F.

NORTH ANNA - UNIT 1 3/4 1-15

REACTIVITY CONTROL SYSTEMS BORATED WATER SOURCES - OPERATING LIMITING CONDITION FOR OPERATION 3.1.2.8 Each of the following borated water source (s) shall be OPERABLE:

a. A boric acid storage system and associated heat tracing system with:

1. A contained borated water volume of between 6000 and 16,280 gallons, l

2. Between 12,950 and 15,750 ppm of boron, and l

3. A minimum solution temperature of 115'F. ,

b. The refueling water storage tank with:

1. A contained borated water volume of between 475,058 and 487,000 gallons,

2. Between 2000 and 2100 ppn of boron, and

3. A solution temperature between 40*7 and 50*F.

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

a. With the boric acid storage system inoperable, restore the storage system 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 STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and borated to a SHUTDOWN MARGIN equivalent to at least 1.77% Ak/k at 200*F; restore the boric acid storage system to OPERABLE status within the next 7 days or be in COLD SHUTDOWN within the neF: 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ,

b. With the refueling water storage tank inoperable, restore the tank to OPERABLE status within one 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 SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.1.2.8 Each borated water source shall be demonstrated OPERABLE:

NORTH ANNA - UNIT 1 3/4 1-16

3 EMERGENCY CORE COOLING SYSTEMS 3/4.5.4 BORON INJECTION SYSTEM BORON INJECTION TANK LIMITING CONDITION FOR OPERATION r

3.5.4.1 The boron injection. tank shall be OPERABLE with:

a. A contained borated water volume of at least 900 gallons,

b. Between 12,950 and 15,750 ppm of boron, and

c. A minimum solution temperature of 115'F.

APPLICABILITY: MODES 1, 2 and 3.

ACTION:

With the boron injection. 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 HOT STANDBY and borated to a SHUTDOWN MARGIN equivalent to 1.77% delta k/k at 200*F within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; restore the tank to OPERABLE status within the next 7 days or be in HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

SURVEILLANCE REQUIREMENTS 4.5.4.1 The boron injection tank shall be demonstrated OPERABLE by:

a. Verifying the contained borated water volume at least once per 7 days,

b. Verifying the boron concentration of the water in the tank at least once per 7 days, and

c. Verifying the water temperature at least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

NORTH ANNA - UNIT 1 3/4 5-7

.. ._.. 4 C

EMERGENCY CORE COOLING SYSTEMS n HEAT TRACING >

LIMITING CONDITION FOR OPERATION' 3.5.4.2 At least two independent channels of heat tracing shall be OPERABLE for the boron injection tank and for the heat traced portions of the associ-ated flow paths.

APPLICABILITY: -MODES 1, 2 and 3 1

ACTION:

With only one channel of heat tracing on either the boron injection tank or on the heat traced portion of an associated flow path OPERABLE, operation may continue for up to 30 days proviied the tank and flow path temperatures are

-verified to be greater than or equal to 115'F at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ; otherwise,-be in HOT SHUTDOWN witirin 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . '

SURVEILLANCE REQUIREMENTS 4.5.4.2 Each heat tracing channel for the boron injection tank and associated flow path shall be demonstrated OPERABLE:

a. At least once per 31 days by energizing each heat tracing channel, and '

b. At least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months by verifying the tank and flow path temperatures to be greater'than or equal to 115*F. The tank l temperature shall be determined by measurement. The flow path temperature shall be determined by either measurement or recircu-lation flow until establishment of equilibrium temperatures within the tank.

NORTH ANNA - UNIT 1 3/4 5-8

t 3/4.9 REFUELING OPERATIONS W BORON CONCENTRATION LIMITING CONDITION FOR OPERATION 3.9.1 With the reactor vessel head unbolted or removed, the boron concentra-tion of all filled portions of the Reactor Coolant System and the refueling canal shall be maintained uniform and sufficient to ensure that the more restrictive of the.following reactivity conditions is met:

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'a. Either a K of 0.95 or less, which includes a 1% Ak/k conserva-4 tiveallowIbbeforuncertainties,or

b. AI boron concentration of 22000 ppa, which includes a 50 ppa conservative allowance for uncertainties.

APPLICABILITY: MODE 6*.

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ACTION:

With the requirements of the above specification not satisfied,_immediately suspend all operations involving CORE ALTERATIONS or positive reactivity changes and initiate and continue boration at 210 gpm of 212,950 ppa boric 'l acid' solution or its equivalent until K is reduced to so.95 or the boron i' concentrationisrestoredto22000ppe,'wkicheveristhemorerestrictive.-

.The provisions of Specification 3.0.3 are not applicable..

SURVEILLANCE REQUIREMENTS , 4.9.1.1 The more restrictive of the aboveitwo reactivity conditions shall be

' determined prior to

, a. ' Removing or unbolting the reactor vessel head, and

b. Withdrawal of any full length control rod located within the

. reactor pressure vessel, in excess of 3 feet from its fully

, inserted position.

4.9.1.2 The boron concentration of the reactor coolant system and the n' refueling canal shall be determined by chemical analysis at least once per 72

' hours.

c

The reactor shall be maintained in MODE 6 when the reactor vessel head is

unbolted or removed.

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, NORTH ANNA - UNIT 1 3/4 9-1 l

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3/4.10 SPECIAL TEST EXCEPTIONS 4 ~ SHUTDOWN MARGIN LIMITING CON'ITION D FOR OPERATION 3.10.1' The SHUTDOWN MARGIN requirement of Specification 3.1.1.1 may be .

suspended for measurement'of control rod worth and SHUTDOWN MARGIN provided the reactivity equivalent to at least the highest estimated control rod worth is available for trip insertion from OPERABLE control rod (s).

-APPLICABILITY: MODE 2.

ACTION:

a. With any full length control rod not fully inserted and with less than the above reactivity equivalent available for trip insertion, initiate and continue boration at'210 gpm of at'least 12,950 ppm boric acid solution or its equivalent until the SHUTDOWN MARGIN required by l

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Specification 3.1.1.1 is restored.

b', With all full length control rods inserted and the reactor suberitical by less than the above reactivity equivalent, immediately initiate and continue boration at 210 gpm of at least 12,950 ppm boric acid solution l or its equivalent until the SHUTDOWN MARGIN required by Specification 3.1.1.1 is restored.

SURVEILLANCE REQUIREMENTS 4.10.1.1 The position of each full length rod either partially or fully withdrawn shall be determined at least once per 2' hours.

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4.- 10.1. 2 Each full length rod that is not fully inserted shall be demonstrated capable of full insertion when tripped from at least 50%

withdrawn position within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months prior to reducing the SHUTDOWN MARGIN to less than the limits of Specification 3.1.1.1.

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NORTH ANNA.- UNIT 1 3/4 10-1

1 REACTIVITY CONTROL' SYSTEMS BASES

L3/4.1.2' BORATION SYSTEMS (Continued) '

With the RCS average temperature above 200*F, a. minimum of two separate and redundant boron injection systems are provided-to ensure single functional capability in the event an. assumed failure-renders one of the systems inoperable. Allowable out-of-service periods ensure that minor

component repair or corrective action may be completed without undue risk to overall facility safety from injection system failures during the repair ,

-period.

The boration capability of either system is sufficient to provide a SHUTDOWN MARGIN for expected operating conditions of 1.77% Ak/k after xenon decay and cooldown to 200*F. This expected boration capability requirement occurs at EOL from full power equilibrium xenon conditions and requires 6000 gallons of 12,950 ppm borated water from the boric acid storage tanks or 70,000 gallons of 2,000 ppm borated water from the refueling water storage

tank.

The limitation for a maximum of one centrifugal charging pump to be OPERABLE and the Surveillance Requirement to verify all charging pumps except the required OPERABLE pump to be inoperable below 320*F provides assurance that a mass addition pressure transient can be relieved by the operation of a j single-PORV.

With the RCS temperature below 200*F, one injection system is acceptable without single failure consideration on the basis of the stable reactivity condition of the reactor and the additional restrictions prohibiting CORE ALTERATIONS and positive reactivity change in the event the single injection

' system becomes inoperable.

The boron capability required below 200*F is sufficient to provide a SHUTDOWN MARGIN of 1.77% Ak/k after xenon decay and cooldown from 200*F to 140*F. This condition requires either 1378 gallons of 12,950 ppm borated l water-from the. boric acid storage tanks or 9690 gallons of 2000 ppm borated 9, water from the refueling water storage tank.

The contained water volume limits include allowance for water not available because of discharge-line location and other physical

' characteristics. The OPERABILITY of one boron injection system during REFUELING insures that this system is available for reactivity control while in MODE 6.

NORTH ANNA - UNIT.1 B 3/4 1-3

EMERGENCY CORE COOLING SYSTEMS BASES ECCS SUBSYSTEMS (Continued)

With the RCS temperature below 350*F, one OPERABLE ECCS subsystem is

- acceptable without single failure consideration on-the basis of the stable reactivity condition of the reactor and the limited core cooling requirements.

- The-limitation for a maximum of one centrifugal charging pump and one low

~

head' safety injection pump to be OPERABLE and the Surveillance Requirement to

. verify all charging pumps and low head safety injection pumps except the required OPERABLE pump to be inoperable below 320*F provides assurance that a

- mass addition pressure transient can be relieved by the operation of a single PORV.

The-Surveillance Requirements provided to ensure OPERABILITY of each

. component ensures that at a minimum, the assumptions used in_the safety -

. analyses are met and that subsystem OPERABILITY is maintained.

~ 3/4.5.4 BORON INJECTION SYSTEM The OPERABILITY of the boron injection system as part of the ECCS ensures that sufficient negative reactivity is injected into the core to counteract any positive increase in reactivity caused by RCS system cooldown. RCS

. cooldown-can be caused by inadvertent depressurization, a loss-of-coolant accident or a steam line-rupture.

' The' limits on injection tank minimum contained volume and boron concentration ensure that.the assumptions used in the steam line break analysis are met.

- The OPERABILITY of the redundant heat tracing channels associated with the

- boron injection system ensure that the solubility of the boron solution will

.be maintained above the solubility limit of 111*F at 15,750 ppm boron. l 4

4 NiORTH_ ANNA - UNIT 1 B 3/4 5-2 4

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s ATTACHMENT 3 PROPOSED CHANGES TO TECHNICAL SPECIFICATIONS-REDUCTION IN 80RON CONCENTRATIONS FOR THE BIT AND BORIC ACID SYSTEM -

NORTH ANNA POWER STATION, UNIT 2 t

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3/4.1-REACTIVITY CONTROL SYSTEMS 3/4.1.1 BORATION CONTROL SHUTDOWN MARGIN - T avg GREATER THAN 200*F LIMITING CONDITION FOR OPERATION 3.1.1.1 The SHUTDOWN MARGIN shall be greater than or equal to 1.77%Ak/k.

APPLICABILITY: MODES 1, 2*, 3, and 4.

ACTION:

With the SHUTDOWN MARGIN less than 1.77% delta k/k, immediately initiate and continue boration at greater than or equal to 10 gpm of a solution containing greater than or equal to 12,950 ppm boron or equivalent until the required l-SHUTDOWN MARGIN is restored.

SURVEILLANCE REQUIREMENTS 4.1.1.1.1 The SHUTDOWN MARGIN shall be determined to be greater than or equal to 1.77% delta k/k:

a. Within one hour after detection of an inoperable control rod (s) and at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter while the rod (s) is inoperable.

If the inoperable control rod is immovable or untrippable, the above required SHUTDOWN MARGIN shall be increased by an amount at least equal to the withdrawn worth of the immovable or untrippable control rod (s).

b. When in MODE 1 or MODE 2 with K g greater than or equal to 1.0,

'atleastonceper12hoursbyv,rkfyingthancontrolbankwith-e drawal'is within the limits of Specification 3.1.3.6.

c. When in MODE 2 with K less than 1.0, within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months prior to achievingreactorcriIkbalitybyverifyingthatthepredicted critical control rod position is within the limits of Specification 3;1.3.6.

See Special Test Exception 3.10.1 NORTH ANNA - UNIT 2 3/4 1-1

.a .

+

REACTIVITY CONTROL SYSTEMS SHUTDOWN MARGIN - T avg LESS THAN OR EQUAL TO 200*F SURVEILLANCE REQUIREMENTS 3.1.1.2 The SHUTDOWN MARGIN shall be greater than or equal to 1.77% delta k/k.

APPLICABILITY: MODE 5.

ACTION:

With the SHUTDOWN MARGIN less than 1.77% delta k/k, immediately initiate and continue boration at greater than or_ equal to 10 gpm of a solution containing greater than or equal to 12,950 ppm boron or equivalent until the required l, SHUTDOWN MARGIN is restored.

SURVEILLANCE REQUIREMENTS 4.1.1.2 The SHUTDOWN MARGIN shall be determined to be greater than or equal to 1.77% delta k/k:

a. Within one hour after detection of an inoperable control rod (s) and at least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months thereafter while the rod (s) is inoperable.

If the inoperable control rod is immovable or untrippable, the SHUTDOWN MARGIN shall be increased by an amount at least equal to the withdrawn worth of the immovable or untrippable control rod (s).

b. At least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months by consideration of the following factors:

1. Reactor coolant system boron concentration,

2. Control rod position,

3. Reactor coolant system average temperature,

4. Fuel burnup based on gross thermal energy generation,

5. Xenon concentration, and

6. Samarium concentration.

NORTH ANNA - UNIT 2 3/4 1-3 t-

.. +

REACTIVITY CONTROL SYSTEMS 3/4.1.2 BORATION SYSTEMS FLOW PATHS - SHUTDOWN LIMITING CONDITION FOR OPERATION As a minimum, one of_the following boron injection flow paths shall

~

3.1.2.1 be OPERABLE:

.a. A flow path from the boric acid tanks via a boric acid transfer -

pump through a~ charging' pump to the Reactor Coolant System if only the boric acid storage tank in Specification 3.1.2.7a is OPERABLE, or b .' The flow path from the refueling water storage tank via a charging '

pump to the Reactor Coolant System if only the refueling water -

storage tank in Specification 3.1.2.7b is OPERABLE.

. APPLICABILITY: MODES 5 and 6 ACTION:

.With'none of the above flow paths OPERABLE, suspend all operations involving

~

CORE ALTERATIONS or positive reactivity changes until at least one injection path is restored to OPERABLE status.

EURVEILLANCE REQUIREMENTS 4'.1. 2 .1 At least one of the above required flow paths shall be demonstrated OPERABLE:

a. At least once per 7 days by verifying that the temperature of the heat traced portion of the flow path is greater than or equal to 115'F when a. flow path from the boric acid tanks is used.

l. .

b. At least once per 31 days by. verifying that each valve (manual, power operated or automatic) in the flow path that is not locked, sealed, or otherwise secured in position, is in its correct posi-tion.

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NORTH ANNA - UNIT 2 3/4 1-8

, - 4 : ..-*

REACTIVITY' CONTROL SYSTEMS FLOW PATHS - OPERATING LIMITING CONDITION FOR OPERATION 3.1.2.2 . At least -two of 'the following three boron injection flow paths shall be OPERABLE:

a.- The flow path from the boric acid tanks via a boric acid transfer pump and a charging pump to the Reactor Coolant System.

Jb . Two flow paths from the refueling water storage tank via charging pumps to the Reactor Coolant System.

APPLICABILITY: MODES 1, 2, 3 and 4 .

ACTION:

a. With only one of the above required boron injection-flow paths to the Reactor Coolant System OPERABLE, restore at least two boron injection flow paths to the Reactor Coolant System 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 STANDBY and borated to a SHUTDOWN MARGIN equivalent to at least 1% delta k/k at 200'F within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; restore at least two flow paths to OPERABLE status within the-next 7 days or be in COLD SHUTDOWN within the next 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.1.2.2 Each of the above required' flow paths shall be' der.onstrated OPERABLE:

a. At least once per 7 days by verifying that' the temperature of the heat traced portion of the flow path from the boric acid tanks is greater than or equal to 115'F when it is a required water source.

l f0nly one boron injection' flow path is required to be OPERABLE whenever-the temperature of one or more of the RCS cold legs is less.than or equal to 340*F.

NORTH ANNA - UNIT 2 3/4 1-9 y

+

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A REACTIVITY CONTROL SYSTEMS BORATED WATER SOURCES - SHUTDOWN LIMITING CONDITION FOR OPERATION

_3.1.2.7 .As a minimum, one of the following borated water sources shall be !

OPERABLE:

a. .A boric acid storage system and at least one associated heat tracing system with:

1. A minimum contained borated water volume of 1378 gallons, l Between 12.950 and 15,750 ppa of boron, and 2.

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3. A minimum solution temperature of 115'F.

b. The refueling water storage tank with

1. A minimum contained borated water volume of 51,000 gallons,

-2. Between 2000 and 2100 ppm of boron, and

3. .A minimum solution temperature of 35'F.

APPLICABILITY: MODES S and 6

. ACTION:

With no borated water' source 0PERABLE, suspend all operations involving CORE

-ALTERATIONS or positive reactivity changes until at least one borated water source is restored to OPERABLE ~ status.

SURVEILLANCE REQUIREMENTS 4.1.2.7- _The above required borated water source shall be demonstrated

OPERABLE

a.. At least once per 7 days by:

1. , Verifying the boron concentration of the water,

i. 2. Verifying the_ contained borated water volume of the tank, and

3. ~ Verifying the boric acid storage tank solution temperature

? when-it is the source of borated 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 when

. : l .- .it is the source of borated water and the outside air temperature is less than 35'F.

T NORTH ANNA - UNIT 2- 3/4 1-13 -

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... i REACTIVITY C0NTROL SYSTEMS BORATED WATER SOURCES - OPERATING LIMITING CONDITION FOR OPERATION '

3.1.2.8 As a minimum, the following borated water source (s) shall be OPERABLE as required by Specification 3.1.2.2:

a. A boric acid storage system and at least one associated heat tracing system with:

1. A contained borated water volume of between 6,000 and 16,280 l gallons,

2. Between 12,950 and 15,750 ppm of boron, and l

3. A minimum solution temperature of 115*F. -

b. The refueling water storage tank with:

1. A contained borated water volume of between 475,058 and 487,000 gallons,

2. Between 2000 and 2100 ppm of boron, and

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

APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

.a. With the boric acid storage system inoperable and being used as one of the above required borated water sources, restore the storage system 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 STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and borated to a SHUTDOWN MARGIN equivalent to at least 1.77% Ak/k at 200*F; restore the boric acid storage system to OPERABLE status within the next 7 days or be in COLD SHUTDOWN within the next 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ,

b. With the refueling water storage tank inoperable, restore the tank to OPERABLE status within one 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 SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

NORTH ANNA - UNIT 2 3/4 1-14

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. EMERGENCY CORE COOLING SYSTEMS 3/4.~5.4 BORON INJECTION SYSTEM.

~ BORON INJECTION TANK ,

LIMITING CONDITION FOR OPERATION 3.5.4.1

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The boron injection tank shall be OPERABLE with:

a.. A contained borated water volume of at least 900 gallons,

b. Between 12,950 and 15,750 ppm of boron, and

c. A minimum solution temperature of 115'F.

' APPLICABILITY: MODES 1, 2 and 3.

r ACTION:

With the boron injection tank. inoperable, restore the tank to OPERABLE status within I hour or be in HOT STANDBY and borated to a SHUTDOWN MARGIN equivalent to 1.77% delta k/k at 200*F within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months ; restore the tank to OPERABLE status within the next 7 days or be in HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

SURVEILLANCE REQUIREMENTS -4.5.4.1 The boron injection tank shall be demonstrated OPERABLE by:

a. Verifying the contained boratel water volume at least once per 7 days,

- b .' Verifying the boron concentration of the water in the tank at least once per 7 days, and

c. Verifying the water temperature at least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

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I' i NORTH ANNA - UNIT 2 3/4 5-8 l

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EMERGENCY CORE COOLING SYSTEMS HEAT TRACING LIMITING CONDITION FOR OPERATION

' 3.5.4.2 At least two independent channels of heat tracing shall be OPERABLE for the boron injection tank and for the heat traced portions of the assoc 1-ated flow paths.

APPLICABILITY:- MODES 1, 2 and 3 ACTION:

With only one channel of heat tracing on either the boron injection tank or on the heat traced portion of an associated flow path OPERABLE, operation may

. continue for up to 30 days provided the tank and flow path temperatures are verified to be greater than or equal to 115'F at least once per 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ; otherwise, be in HOT SHUTDOWN within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

g-SURVEILLANCE REQUIREMENTS a

- 4.5.4.2- Each heat tracing channel for the' boron injection tank and associated flow path shall be demonstrated OPERABLE:

a. At least once per 31 days by energizing each heat tracing channel, and s

b. At least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months by verifying the tank and flow path temperatures to be greater than or equal to 115'F. The. tank temperature shall be determined by measurement. The flow path l temperature shall be determined by either measurement or recircu-

, lation flow until establishment of equilibrium temperatures within the tank.

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iV 3/4.9 REFUELING OPERATIONS BORON CONCENTRATION LIMITING CONDITION FOR OPERATION 3.9.1. With the reactor vessel head unbolted or removed, the boron concentra-tion of all filled portions of the Reactor Coolant System and the refueling canal shall be maintained uniform and sufficient to ensure that the more restrictive of the following reactivity conditions is met:

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a. Either a K of 0.95 or less, which includes a 1% delta k/k conservati$$fallowance for uncertainties, or

b. A boron concentration of greater than or equal to 2000 ppm, which includes a 50 ppm conservative allowance for uncertainties.

APPLICABILITY: MODE 6*.

ACTION: -

With the requirements of the above specification not satisfied, immediately suspend all operations involving CORE ALTERATIONS or positive reactivity changes and initiate and continue boration at greater than or equal to 10 gpm of a solution containing greater than or equal to 12,950 ppa. boron or its l equivalent until K is reduced to less than or equal to 0.95 or the boron concentrationisreskoredtogreaterthanorequalto2000 ppm,whicheveris the more restrictive. -The provisions of Specification 3.0.3 are not

. applicable.

SURVEILLANCE REQUIREMENTS 4.9.1.1 The more restrictive of the above two reactivity conditions shall be determined prior to:

i- a .' Removing or unbolting the reactor vessel head, and "

b. Withdrawal of any full length control rod located within the reactor pressure vessel, in excess of 3 feet from its fully inserted position.

4.9.1.2 The boron concentration of the reactor coolant system and the

-refueling canal shall be determined by chemical analysis at least once per-72 hours.

The reactor shall be maintained in MODE 6 when the reactor vessel head is unbolted or removed and fuel is in the reactor vessel.

NORTH ANNA - UNIT 2 3/4 9-1

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e. gjf' 3/4.10 SPECIAL TEST EXCEPTIONS SHUTDOWN MARGIN-LIMITING CONDITION FOR OPERATION 3.10.1 'The SHUTDOWN MARGIN requirement of Specificatica 3.1.1.1 may be suspended for measurement of centrol rod worth _and SHUTDOWN MARGIN provided the reactivity equivalent to at least the highest estimated control rod worth is available=for trip insertion from OPERABLE control rod (s).

APPLICABILITY: MODE 2.

ACTION:

a. With any full length control rod not fully inserted and with less than

-the above reactivity equivalent available for trip insertion, initiate and continue boration at greater than or equal to 10 gpm of a solution containing at least 12.950 ppm boron or its equivalent until the l

SHUTDOWN MARGIN required by Specification 3.1.1.1 is restored. *

b. With all full length control rods inserted and the reactor suberitical by less than the above reactivity equivalent, immediately initiate and continue boration at greater than or equal to 10 gpm of.a solution containing at least 12.950 ppm boron or its equivalent until the l

SHUTDOWN MARGIN required by Specification 3.1.1.1 is restored.

SURVEILLANCE REQUIREMENTS 4.10.1.1' - The position of each control rod either partially or fully ,.

withdrawn shall be determined at least once_per 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months .

4.10.1.2 Each control rod that is not fully inserted shall be demonstrated capable of full insertion when tripped from at least 50% withdrawn position within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months prior to reducing the SHUTDOWN MARGIN to less than the limits of Specification 3.1.1.1.

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s REACTIVITY CONTROL ~ SYSTEMS BASES 3/4.1.2- BORATION SYSTEMS' The boron injection system ensures that negative reactivity control is available during each mode of facility operation. The components required toiperform this function include 1) borated water sources 2) charging pumps', 3) separate flow paths, 4) boric acid transfer pumps, 5) associated heat tracing systems, and 6) an emergency power supply from OPERABLE diesel generators.

_ . With the,RCS average temperature above 200*F, a minimum of two boron injection flow paths are required to ensure single functional capability in

-the event an' assumed failure' renders one of the flow paths inoperable. 'The boration capability of either flow path is sufficient to provide a SHUTDOWN MARGIN from expected operating, conditions of 1.6% delta k/k after renon decay and cooldown to 200*F. The maximum expected boration capability requirement ~

occurs at EOL from full power equilibrium. xenon conditions and requires 6000

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gallons of 12,950 ppa borated water from the boric acid storage tanks or

'70,000 gallons of 2000. ppa borated water from the refueling water storage tank..

With the RCS temperature below 200*F, one injection system is acceptable without single failure consideration on the basis of the stable reactivity condition of the reactor and the additional restrictions prohibiting CORE

. ALTERATIONS and positive reactivity change in the event the single-injection

system becomes inoperable.

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The limitation for a maximum of one' centrifugal charging pump to be OPERABLE and the Surveillance Requirement to verify all charging pumps except the required OPERABLE pump to be inoperable below 340*F provides assurance

- that a mass addition pressure transient can be relieved by the operation of a

-single PORV.

The boron capability required below 200*F is sufficient to provide a SHUTDOWN MARGIN of 1.77% delta k/k after xenon decay and cooldown from 200*F to 140*F. This condition requires either 1378 gallons of 12.950 ppm borated l water from the boric acid storage tanks or 9690 gallons of 2000 ppm borated water from the refueling water storage tank.

NORTH ANNA - UNIT 2 B 3/4 1-3 m .

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EMERGENCY CORE COOLING SYSTEMS BASES-ECCS SUBSYSTEMS (Continued)

With.the RCS temperature below 350*F, one OPERABLE ECCS subsystem is acceptable without single failure consideration on the basis of the stable 4

reactivity condition-of the reactor and the limited core cooling requirements.

' The limitation for a maximum of one centrifugal charging pump and one low head safety injection pump to be OPERABLE and the Surveillance Requirement to verify all charging pumps and low head _ safety injection pumps except the required OPERABLE pump to be inoperable below 340*F provides assurance that a mass addition pressure transient can be relieved by the operation of a single PORV.

b The Surveillance Requirements provided to ensure OPERABILITY of each ~

component ensures that at a minimum, the assumptions used in the safety analyses are met and that subsystem OPERABILITY is maintained. Surveillance requirements for throttle valve position stops and flow balance testing provide assurance that proper ECCS flows will be maintained in the event of.a LOCA. Maintenance of_ proper flow resistance and pressure drop in the piping system to each injection point is necessary to: (1) prevent total pump flow from exceeding runout conditions when the system is in its minimum resistance configuration, (2) provide the proper flow split between injection points in

, accordance with the assumptions used in the ECCS-LOCA analyses, and (3) provide an acceptable level of total ECCS flow to all injection points equal to or above that assumed in the ECCS-LOCA analyses.

-3/4.5.4 BORON INJECTION SYSTEM The OPERABILITY of the boron injection system as part of the ECCS ensures that sufficient negative reactivity is injected into the core to counteract any positive increase in reactivity caused by RCS system cooldown. RCS cooldown can be caused by' inadvertent depressurization, a loss-of-coolant accident or a steam line rupture.

The limits on injection tank minimum contained volume and boron concentration ensure that the assumptions used in the steam line break analysis are met.

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

The OPERABILITY of the redundant heat tracing channels associated with the boron injection system ensure that the solubility of the boron solution will

> be maintained above the solubility limit of 111*F at 15,750 ppm boron.

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

ML20112A711

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