Text

Proposed Tech Specs,Increasing Boron Concentration Limits in Refueling Water Storage Tanks & Accumulators
	ML18092B457
Person / Time
Site:	Salem
Issue date:	03/10/1987
From:	; Public Service Enterprise Group
To:	;
Shared Package
ML18092B456	List: ML18092B455; ML18092B457;
References
	NUDOCS 8703180138
	Download: ML18092B457 (16)
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3/4.l REACTIVITY CONTROL SYSTEMS 3/4.1.1 BORATION CONTROL SHUTDOWN MARGIN - Tavg > 200°F LIMITING CONDITION FOR OPERATION 3.1.1.1 The SHUTDOWN MARGIN shall be.:_ 1.6% ~k/k.

. APPLICABILITY:

MODES 1, 2*, 3, and 4.

ACTION; With the SHUTDOWN MARGIN < i.6% tik/k, immediately initiate and continue 1 boration at > 10 gpm of 20~00 ppm 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~ 1.6% ~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is immovable or untrippable,'the above required SHUTDOWN MARGIN shall be increased by a:n amount at least equal to the withdrawn worth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 withdrawal is within the limits of Specification 3.1.3.5.

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 3.1.3.5.

See Special Test Exception 3.10. 1

w~ th Keff ~ 1.o

1. With Keff < l.0 SALEM - UNIT 3/4 1-1

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8703180138 870310 "1

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p PDR I

REACTIVITY CONTROL SYSTEMS SHUTDOWN MARGIN - i

< 200QF avg -

LIMITING CONDITION FOR OPERATION 3.1.l.2 The SHUTDOWN MARGIN shall be> 1.0% ~k/k.

APPLICABILITY:

MODE 5.

ACTION:

With the SHUTDOWN MARGIN < 1.0% ~k/k, immediately initiate and continue boration at~ 10 gpm of 20,000 *ppm boric acid solution or I

equivalent until the required SHUTDOWN MARGIN is restored.

SURVEILLANCE REQUIREMENTS 4.1.1.2 The SHUTDOWN MARGIN shall be determined to be~ l.0% ~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. IT the inoperable control rod is immovable or_untrip-pable, 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 considerati6n of the following.

factors:

l.

Reactor coolant system boron concentration,

2.

Control rod position,

3.

Reactor coolant system average ternperatur'e,

4.

Fuel burnup based on gross thermal energy generation,*

5.

Xenon concentration, and

6.

Samarium concentration.

SALEM - UNIT 1 3/4 1-3

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 boric acid storage system and at_ least one associated heat. -

I traci~g system with:

- * * -~-

I

1.

A minimum contained volume of 835 gallons,

2.

Between 2 0, 0 0 0 and 2 2, 5 0 0 ppm of boron, and,

- I

3.

A minimum solution temperature of 145°F.

b.

The refueling water storage tank with:

l.

A minimum contained volume of 12,500 gallons,

2.

A minimum boron concentration of.2300 ppm, ana

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:

l.. Verifying the boron concentration of the water,

2.

Verifying the water level of the tank, and

3.

Verifying the boric acid storage tank solution temperature when it is the source of borated water.

SALEM - UNI°T l 3/4 1-14 I

REACT IV ITV CONTROL SYSTEMS BORATED WATER SOURCES - OPERATING LIMITING CONDITION FOR OPERATION 3.1.2.8 Each 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 volume of 5106 gallons,

2. Between 20,000 and 22,500 ppm of boron, and,

3. A minimum solution temperature of 145°F.

b. The refueling water storage tank with:

1. A contained volume of between 364,500 and 400,000 gallons of water,

2. A boron concentration of between 2,300 and 2,500 ppm, and

3. A minimum solution temperature of 35°F.

APPLICABILITY:

MODES 1, 2, 3 and 4.

ACT ION:

a.

With the boric acid storage system inoperable and being used as one of the above required boration water systems, restore the storage system to OPERABLE status wihin 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or be in at least HOT STANOOY 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% delta K/k at 200°F; restore the boric acid storage system to OPERABLE status within the next 7 days or be in CO LO SHUT DOWN 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 STANOOY 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 demon st rated OPERABLE:

SALEM - UNIT 1 3/4 1-16 r

I

13i4.5 EMERGENCY CORE COOLING SYSTEMS (ECCS)

ACCUMULATORS LIMITING CONDITION FOR OPERATION 3.5.1 Each reactor coolant_system accumula,tor shall.be.OPERABLE with:

.a.

, The isolation valve open,

b.

A contained volume of between 6,223 and 6,500 gallons of borated water,

c.

A boron concentration of between 2,200 and 2,500 ppm,

and,

d.

A nitrogen cover-pressure of between *595,5 and 647.5 psig.

APPLICABILITY:

MODES 1, 2 and 3:*

ACTION:

a.

With one accumulator inoperable, except as a result of a closed isolation valve, restore the inoperable accumulator to OPERABLE status within one hour or be in HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

b.

With on~ accumulator inoperable due to the isolation valve*bein~

closed, either immediately open the isolation valve or be in HOT STANDBY within one hour and 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.l Each accumulator shall be demonstrated OPERABLE:

a.

At Teast once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by:

1.

Verifying the water level and nitrogen cover-pressure in the tanks, and

2.

Verifying that each accumulator isolation valve is open.

Pressurizer Pressure above 1000 psig.

SALEM - UNIT l 3/ 4 5-1

L EMERGENCY CORE COOLING SYSTEMS 3/4.5.4. BORON INJECTION SYSTEM BORON INJECTION TANK LIMITING CONDITION FOR OPERATION~--------------

3.5.4. 1 The boron injection tank shall be OPERABLE with: **

a.

A minimum contained volume of 900 gallons of borated water,*

b.

Between 2 o,o o o and 2 2,5 o o -* ppm of boron, and

c.

A minimum solution temperature of 145°F, APPLICABILITY:

MODES l, 2 and 3.

ACTION:

With the boron injection tank inoperable, restore the tank to OPERABLE status within l hour or be in HOT STANDBY and borated to a SHUTDOWN MARGIN equivalent to 1% Ak/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 water level through a recirculation flow test 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 .

Effective 5:55 P.M. January 12, 19.79 and expiring at 11:55 A.M.,

January 13, 1979 the following ACTION statement is applicable:

W1th 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 1n HOT STANDBY and borated to a SHUTDOWN MARGIN equivalent to 1% Ak/k at*200°F within the next 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-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 .

SALEM - UNIT l

. 3/4 5-7

- The change in concentration is an interim step to maintain consistency with the concentration in the Boric Acid Tanks.

When Boron Injection Tank Elimination LCR 85-07 is approved by the NRC and implemented by PSE&G, 3/4.5.4 will be deleted.

I

.I

EMERGENCY CORE COOLING SYSTEMS REFUELING WATER STORAGE TANK LIMITING CONDITION FOR OPERATION 3.5.5 The refueling water storage tan.k (RWST) shall be OPERABLE with:

a.

A contained volume of between 3 6 4, 5 o oand 400,000 of borated water.

b.

A boron concentration of between 2,300 and 2,500 ppm, and I

c.

A minimum water temperature of 35°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 water level 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 when the outside air temperature is < *35°F.

SALEM - UNIT l 3/4 5-g

3/4.10 SPECIAL TEST EXCEPTIONS SHUTOOWN MARGIN LIMITING CONDITION FOR OPERATION 3.10.1 The SHUTOOWN 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), and APPLICABILITY: MO DE 2.

ACT ION:

a.

With any full length control rod not fully inserted and with less than the above reactivity equivalent for trip insertion, immediately initiate and continue boration at > 10 gpm of 20,000 ppm boric acid solution or its equivalent until the SHUTOOWN MARGIN required by Specification 3.1.1.1 is restored.

b.

With all full length control rods inserted and the reactor subcritical by less than the above reactivity equivalent, immediately initiate and continue boration at > 10 gpm of 20,000 ppm boric acid solution or its t

equivalent until the SHUTOOWN MARGIN required by Specification 3.1.1.1 is restored.

SURVEILLANCE REQUIREMENTS 4.10.1.1 The position of each full length and part length 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 full length rod not fully inserted shall be demonstrated capable of full insertion when tripped from at least the 50% withdrawn position within 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months prior to reducing the SHUTOOWN MARGIN to less than the limits of Specification 3.1.1.1.

SA LEM -

UN IT 1 3/4 10-1

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 to perform 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 SHUT!XlWN MARGIN from expected operating conditions of 1.6% delta k/k after xenon decay and cooldown to 200°F. The maximum expected boration capability requirement occurs at EOL from full power equilibrum xenon conditions and requires 5106 gallons of 20,0oo-ppm borated water from the boric acid storage tanks or 85000 gallons of 2300 ppm borated water from the refueling water storage tank.

However, to be consistent with the ECCS requirements, the RWST is required to have a minimum contained volume of 350,000 gallons during operations in MODES 1, 2, 3 and 4.

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 SHUT!XlWN MARGIN of 1% delta k/k after xenon decay and cooldown from 200°F to 140°F. This condition requires either 835 gallons of 20,000 ppm borated water from the boric acid storage tanks or 12500 gallons of 2300 ppm borated water from the refueling water storage tank.

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 the solution recirculated within containment after a LOCA.

This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

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 ensures that this system is available for reactivity control while in MODE 6.

SA LEM - UN IT 1 B 3/4 1-3

EMERGENCY CORE COOLING SYSTEMS BASES 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 the reactivity caused by RCS system cooldown.

RCS cooldown can be caused by inadvertant 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 137°F at 22,500 ppm boron.

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 boron concentration ensure that 1) sufficient water is available within containment to permit recirculation cooling flow to the core, 2) the reactor will remain subcritical in the cold condition following a small LOCA assuming complete mixing of the RWST, RCS and ECCS water volumes with all controls rods inserted except the most reactive control assembly (ARI-1), and 3) the reactor will remain subcritical in the cold condition following a large break LOCA (break flow area > 3.0 FT2) assuming complete mixing of the RWST, RCS, ECCS water and other sources of water that may eventually reside in the sump Post-LOCA with all control rods assumed to be out (ARO).

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 the solution recirculated within containment after a LOCA.

This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

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

SA LEM -

UN IT 1 B3/4 5-2

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

3. 1.2.5 As a minimum, one of the following borated water sources shall be OPERABLE:

a.

A -boric acid storage system and_ a:t leas~ one ass_ociated heat tracing system with: *

l.

A minimum contained volume of 835 gallons,

2.

Between 20,000 and 22,500 ppm of boron, and

3.

A minimum solution temperature of 145°F.

b.

The refueling water storage tank with:

1.

~minimum contained volume of 12,500- gallons, 2:

A minimum boron concentration of 2, 30Q _ppm, 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;2.5 The above required borated water source shall be demonstrated OPERABLE:

a.

At least once per 7 days by:

l.

Verifying the boron concentration of the water,

2.

Verifying the water level 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 it is the source of borated water and the outside air temperature is less than 35°F.

SALEM - UNIT 2 3/4 1-11 I

REACTIVITY CONTROL SYSTEMS BORATED WATER SOURCES - OPERATING LIMITING CONDITION FOR OPERATION

3. 1.2.6 As a minimum, the following borated water source(s) shall be OPERABLE as required by Specification 3. 1. 1.2:

a.

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

1.

A minimum contained volume of 51.06gal lons,

2.

Between 20,000 and*22,soo ppm of boron, and

3.

A minimum solution temperature of 145°F.

b.

The refueling water storage tank with:

l.

A contained volume of between 364,500 and 400,000 gallons of water,

2.

A boron concentration of between 2, 3 o o and 2, 5 o O ppm, and

3.

A m1nimum solution temperature of 35°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% delta k/k at 200°F; restore the boric acid storage system to OPERABLE status within the next 7 days or be in COLO 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, rester~ 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.*1.2.6 Each borated water source shall be demonstrated OPERABLE:

a.

At least once per 7 days by:

l.

Verifying the boron concentration in each water source,

2.

Verifying the water level of each ~ater source, and *

3.

Verifying the boric.acid storage system solution temperature.

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 the outside air temperature is less than 35°F.

SALEM - UNIT 2 3/4 1-12 I

I

3/4.5 EMERGENCY CORE COOLING SYSTEMS (ECCS)

ACCUMULATORS LIMITING CONDITION FOR OPERATION 3.5. 1 Each reactor. coolant system accumulator shall be OPERABLE with:

a.

The isolation valve open,

b.

A contained-volume of between 6223 and 6500 gallons of borated

water,

c.

A boron concentration of between 2 2 O O and 2500 ppm, and

d.

A nitrogen cover-pressure of between 595.S and 647.5 psig.

APPLICABILITY:

MODES 1, 2 and 3.~

ACTION:

a.

With one accumulator inoperable, except as a result of a closed isolation valve, restore the inoperable accumulator to OPERABLE status within one hour or be in HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

b.

With one accumulator inoperable due to the isolation valve being closed, either immediately open the isolation valve or be in HOT STANDBY within one hour and 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. l Each accumulator shall be demonstrated OPERABLE:

a.

At least once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months by:

1.

Verifying the water level and nitrogen cover-pressure in the tanks, and

2.

Verifying that each accumulator isolation valve is open.

Pressurizer Pressure above 1000 psig.

SALEM - UNIT 2 3/4 5-1 I

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

a.

A contained volume of between 364 1500 and 400 1000 gallons of borated

water,

b.

A boron concentration of between 2,300 and 2,500 ppm, and c'.

c.

A minimum water temperature of 35°F.

APPLICABILITY:

MODES 11 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:

l.

Verifying the water level 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 when the outside air temperature is less than 35°F.

SALEM - UNIT 2 3/4 5-11 I

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 to perform 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 SHUTIXJWN MARGIN from expected operating conditions of 1.63 delta k/k after xenon decay and cooldown to 200°F. The maxi mum expected borati on capability requirement occurs at EO L from full power equilibrum xenon conditions and requires 5106 gallons of 20,000 ppm borated water from the boric acid storage tanks or 85000 gallons of 2300 ppm borated water from the refueling water storage tank. However, to be consistent with the ECCS requirements, the RWST is required to have a minimum contained volume of 350,000 gallons during operations in MODES 1, 2, 3 and 4.

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 SHUTIXJWN MARGIN of 13 delta k/k after xenon decay and cooldown from 200°F to 140°F. This condition requires either 835 gallons of 20,000 ppm borated water from the boric acid storage tanks or 12500 gallons of 2300 ppm borated water from the refueling water storage tank.

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 the solution recirculated within containment after a LOCA.

This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

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 ensures that this system is available for reactivity control while in MOII 6.

SA LEM -

UN IT 2 B 3/4 1-3

".~* "-_.

EMERGENCY CORE COOLING SYSTEMS BASES 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 LOCI\\.

The limits on RWST minimum volume and boron concentration ensure that 1) sufficient water is available within containment to permit recirculation cooling flow to the core, 2) the reactor will remain subcritical in the cold condition follow-ing a small LOCA assuming complete mixing of the RWST, RCS, and ECCS water volumes with all control rods inserted except the most reactive control assembly (ARI-1), and 3) the reactor will remain subcritical in the cold condition following a large break LOCA (break flow area > 3.0 FT2 ) assuming complete mix)ing of the RWST, RCS, ECCS water and other sources.of water that may eventually reside in the sump Post-LOCA with all control rods assumed to be out (ARO).

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 the solution recirculated within containment after a LOCA.

This pH band minimizes the evolution of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

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

_SALEM - UNIT 2 B 3/4 5-3

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ML18092B457

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