Text

Proposed TS Pages 3/4 1-22 & B 3/4 1-2 Re Clarification of Combined Borated Water Sources & Flow Paths Required in Mode 1 Above 80% Rated Thermal Power
	ML20035C292
Person / Time
Site:	Calvert Cliffs
Issue date:	04/01/1993
From:	; BALTIMORE GAS & ELECTRIC CO.
To:	;
Shared Package
ML20035C260	List: ML20035C259; ML20035C292;
References
	NUDOCS 9304070012
	Download: ML20035C292 (22)
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ATTACHMENT (2)

TECIINICAL SPECIFICATION PAGES i

UNIT I 3/4 1-17 3/4 1-20 3/4 1-21 3/4 1-22 B 3/41-2 B3/41-3 l

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9304070012 930401 PDR ADOCK 05000317 P

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3/4.1 REACTIVITY CONTROL SYSTEMS

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3/4.1.2 BORATION SYSTEMS

' Boric Acid Pumps - Operating-i LIMITING CONDITION FOR OPERATION At leest-Me boric acid pump (s) in the boron injection flow 3.1.2.

@ bE, path (s) requireddPERABLE pursuant to Specification 3.1.2 shall be.

OPERABLE and capable of being powered from an OPERABLE em ency bus if thc

,r, m.

t u-u 4,.,,. u n,,,,,n m. i n gn,r 4 f 4 r,_ u_.,. e...,. m. u.-

e e u.v

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

t ACTION: With one boric acid pump required for the boron injection flow path (s) pursuant toJpecification 3.1.2.h,. inoperable, restore the boric el@ -

acid pump to GPERABLE status within 72 h&tirs or De in at.least HOT STANDBY 3,t.3 %.

or 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 3% Ak/k at 200 F; restore the above required boric acid pump (s) 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 4.1.2.6 No additional Surveillance Requirements other than those required by Specifications 4.0.5 and 4.1.2.2.

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CALVERT CLIFFS - UNIT 1 3/4 1-17 Amendment No. 169

P INSERT A

AND, When in MODE 1 > 80?c of RATED TIIERMAL POWER i

b.

The horic acid pump (s)-in the boron injection flow path (s) required to be OPERABLE pursuant to Specification 3.1.2.8.a shall be OPERAllLE and capable of being powered from an OPERABLE emergency bus.

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%e.piote to dh 3/4.1 REACTIVITY CONTROL SYSTEMS neto 3.I.a.&

3 1.2 B0 RATION SYSTEMS T

C2nsM 3J Borated Water Sources - Operatino LIMITING Cot (DITION FOR OPERATION 3.1.2.8 At 1 t one of the following two combinations of borated wat sources shall b DPERABLE:

a.

Two bor cid storage tank (s) and one associated heat racing circuit perNtank with the contents of the tanks in a ordance l

with Figure 31.2-1 and the boron concentration lir,ted to < 8%,

or b.

Boric Acid Storage Tank 12 OPERABLE per Speci# cation 3.1.2.8.a I

and the refueling ater tank with 1.

A min: mum contai'ned borated water vo me of 400,000 gallons,

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2.

A boron concentratton of between 00 and 2700 ppm,

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3.

A minimum solution te'7perature f 40*F and 4.

A maximum solution temp rat e of 100 F in MODE 1.

mis APPLICABILITY: H0DE 1 > 80% of RATED RMAL POWER.

ACTION:

a.

With neither combinati of borate water sources OPERABLE but at least two of the indi 1 dual borated ater sources OPERABLE, restore at least on of the combinat ns defined in Specification 3.1.2.8 to OPERABL status within 72 h urs or reduce power to less than 80% of TED THERMAL POWER wi hin the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months , b.

With only one orated water source OPERAB, within I hour either restore at 1 st two of the individual bor +ed water sources to OPERABLE s tus or reduce power below 80% o RATED THERMAL POWER and compl with Specification 3.1.2.9.

CALVERT CLIFFS - UNIT 1 3/4 1-20 Amendment No. 169

3/4.1 REACTIVITY CONTROL SYSTEMS 1

SURVEILLANCE REQUIREMENTS 4.1.2.8 least two borated water sources shall be demons. ted OPERABLE:

a.

At 1 ast once per 7 days by:

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1.

Verifyipg the boron concentr on in each water source,

'Ns 2.

Verifying thq contai borated water volume in each water source, and s,

ss 3.

Veri fying. e bori'cs4cid storage tank solLtion temperature.

b.

At least nceper24hourshy erifying the RWT temperature when i

the o side air temperature is 0 F.

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n CALVERT CLIFFS - UNIT 1 3/4 1-21 Amendment No. 169 t

INSERT B 3/4.1 REACTIVITY CONTROL SYSTEMS 3/4.1.2 BORATION SYSTEMS -

Chargina Pumo ECCS Subsystem l

LIMITING CONDITION FOR OPERATION 3.1.2.8 As a minimum, the following equipment shall be OPERABLE:

a.

Boric Acid Storage Tank 12 and its associated heat tracing circuit shall be OPERABLE per Specification 3.1.2.9.a and the boron injection flow path via Boric Acid Pump 12 from Boric Acid Storage Tank 12 shall be OPERABLE per Specification 3.1.2.2.a and Specification 3.1.2.6.

AND, One of the following:

b.

The boron injection flow path from Boric Acid Storage Tank 12 via a gravity feed connection shall be OPERABLE per Specification 3.1.2.2.a. or, Boric Acid Storage Tank 11 and its associated heat tracing circuit shall be OPERABLE per Specification 3.1.2.9.a and the baron injection flow path from Boric Acid Storage Tank 11 via a gravity feed connection shall be OPERABLE per Specification 3.1.2.2.a.

APPLICABILITY: MODE 1 > 80% of RATED THERMAL POWER.

ACTION: With only one of the required combinations of borated water sources and flow paths OPERABLE, restore two required combinations of borated water sources and flow paths to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or reduce power to less than 80% of RATED THERMAL POWER within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and comply with Specifications 3.1.2.2, 3.1.2.5 and 3.1.2.9 as applicable.

CALVERT CLIFFS - UNIT 1 3/4 1-20 Amencment No.

INSERT B 3/4.1 REACTIVITY CONTROL SYSTEMS SURVEILLANCE REQUIREMENTS 4.1.2.8 No additional Surveillance Requirements other than those required by Specift:ations 4.0.5, 4.1.2.2, and 4.1.2.9.

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1 CALVERT CLIFFS - UNIT 1 3/4 1-21 Amendment No.

3/4.1 REACTIVITY CONTROL SYSTEMS

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3/4.1.2

~B0 RATION SYSTEMS

j Borated Water Sources - Operatino LIMITING CONDITION FOR OPERATION 3.1.2.9. At least two of the following three borated water sources shall-be OPERABLE

a.

Two boric acid storage tank (s) and one associated heat tracing;

{

circuit per tank with the contents of the tanks in accordance with Figure 3.1.2-1 and the boron concentration limited to < 8%,

and b.

The refueling water tank with:

1.

A minimum contained borated water volume of.400,000 gallons, 2.

A boron concentration of between 2300 and 2700 ppm, 3.

A minimum solution temperature of 40*F, and 4.

A maximum solution temperature of 100 F in MODE 1.

' APPLICABILITY: MODES 2, 3 and'4.

g ACTION: With only one borated water source OPERABLE, restore at'least'two l

borated water sources 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 3% Ak/k at 200 F; restore at least two borated water sources 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 .

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Ai. 2 BCA of PATrn n g m L pourn CALVERT CLIFFS - UNIT 1 3/4-1-22 Amendment No..169 i

i 3/4.1 REACTIVITY CONTROL SYSTEMS.

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BASES flow rate of at least 3000 GPM will circulate an equivalent Reactor Coolant System volume of 9,601 cubic feet in approximately 24 minutes. The reactivity change rate associated with boron concentration reductions will therefore be within the capability of operator recognition and control.

3/4.1.1.4 Moderator Temperature Coefficient (MTC)

The limitations on MTC are provided to ensure that the assumptions used in the accident and transient analyses remain valid through each fuel cycle.

The surveillance requirements for measurement of the MTC during each fuel cycle are adequate to confim the MTC value since this coefficient changes slowly uue principally to the reduction in RCS boron concentration.

associated with fuel burnup. The confirmation that the measured MTC value is within its limit provides assurances that the coefficient will be mr.ntained within acceptable values throughout cach fuel cycle.

q 3/4.1.1.5 Minimum Temperature For Criticality ihis specification ensures that the reactor will not be made critical with the Reactor Coolant System average temperature less than 515 F.

This limitation is required to ensure 1) the moderator temperature coefficient is within its analyzed temperature range, 2) the protective instrumentation is within its normal operating range, 3) the pressurizer is capable of being in an OPERABLE sti.tus with a steam bubble, and 4) the reactor M3 pressure vessel is above its minimum RT m erature.

3/4.1.2 B0 RATION SYSTEMS y

gQ The oron Inj;.: tion System ensSTT3ilt negative reacti ~ty $ontrol is /

u BreakL(OCS)to avail le during each DE of facility operation. T syste also pr vides coolan flow followi an SIf.Sx(e.g., during a Sma s

supplemeqt flow f the SafetyNInjection System The Small Brpa OCA analysesKssume ow from a singfe charging pu

, accounting fo measurement un tainties and flown:al-distr ution effects in

,1culating a conservatly value of charging flo'w actu lydeliveredtot) ERCS. The s

components. utred to perTorm this fuNc on include 1) bor ted water chh ging pumps, 3) separa low paths, 4) bor c acid phmps,

sources, atedh{egttracingsystems,

5) asso nd 6)g n emergency wer supply from a

OPERABL diesel generators.

pt N N

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Wi;n tne above 200 F, a minimum of tw

-a

.a s edundar for r 2r.jcctier, ystems are provided to ensure single unc ional capability ! st.

as u.u d failure renders one of the systems 1" operable. Allowable out-of-service periods ensure that minor component l

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CALVERT CLIFFS - UNIT 1 B 3/4 1-2 Amendment No. 169 s

l 3/4.1 REACTIVITY CONTROL SYSTEMS

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BASES l

repair or corrective action may be completed without undue risk to overall j

facility safety from injection system failures during the repair period.

The boration capability of either system is sufficient to provide a l

SHUTDOWN MARGIN from all operating conditions of 3.0% Ak/k after xenon i

decay and cooldown to 200 F.

The maximum boration capability requirement occurs at EOL from full power equilibrium xenon conditions and requires boric acid solution from ti boric acid tanks, the concentration and volume of which are met by the range of values given in Specifications 3.1.2.8 and 3.1.2.9, or 55,627 gallons of 2300 ppm borated water from the refueling water tank.

However, to be consistent with the ECCS requirements, the RWT is required to have a minimum contained volume of 400,000 gallons during MODES 1, 2, 3 and 4.

The maximum boron concentration of the refueling water tank shall be limited to 2700 ppm and the maximum boron concentration of the boric acid storage tanks shall be limited to 8% to preclude the possibility of baron precipitation in the core during long tenn ECCS cool i rig.

bodors With the RCS temperature below 200 F, one n;cc.mn system is acceptable without single failure consideration on th as of the stable reactivity condition of the reactor and the additional restrictions prohibiting CCRE ALTERATIONS and positive reactivity change in the event the single injection system becomes inoperable.

$03 The boron capability required below 200 F is based upon providing a 3%

Ak/k SHUTDOWN MARGIN after xenon decay and cooldown from 200*F to 140 F.

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This condition requires either boric acid solution from the boric acid tanks, the requirements of which are met by Specification 3.1.2.7, or 9,844 gallons of 2300 ppm bor m the refueling water tank.

TheOPERABILITYofonedcrc-InjectionJyste during REFUELING ensures that x

this system is availableTor reactiv -

n rol while in MODE 6.

3/4.1.3 MOVABLE CONTROL ASSEMBLIES The specifications of this section ensure that (1) acceptable power distribution limits are maintained, (2) the minimum SHUTDOWN MARGIN is maintained, and (3) the potential effects of a CEA ejection accident are limited to acceptable levels.

The ACTION statements which pennit limited variations from the basic requirements are accompanied by additional restrictions which ensure that the original criteria are met. A regulating or shutdown CEA is considered to be misaligned if it is more than 7.5 inches from any other CEA in its group, however, a shutdown CEA is also considered to be misaligned if it is withdrawn to less than 129 inches even if it is within 7.5 inches of all other CEAs in its group.

For the purposes of the Technical Specifications, a dual assembly, connected to a single CEA drive mechanism, is considered to be a single CEA (e.g., dual shutdown CEAs connected to a single drive mechanism).

CALVERT CLIFFS - UNIT 1 B 3/4 1-3 Amendment No. 174

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INSERT C L

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The Boration System is a subset of the Chemical Volume and Control System. The Boration System ensures that negative reactivity control is available during each MODE of facility operation. The system also provides coolant flow following a SIAS (e.g., during a Small Break LOCA) to supplement flow from the Safety Injection System. Above 80% of RATED TIIERMAL POWER, the Small Break LOCA analyses assume flow from a single charging pump, accounting for measurement l

uncertainties and flow mal-distribution effects in calculating a conservative value of charging flow -

i actually delivered to the RCS. Credit is only taken for the water inventory, no credit is taken for the injected baron. Above 80% of RATED TilERMAL POWER, two independent, redundant, and automatic boration systems are provided to ensure functional capability in the event an assumed failure renders one of the systems inoperable.

l He components required to perform this function include 1) borated water sources,2) charging pumps,3) separate flow paths,4) boric acid pumps,5) associated heat tracing systems, and 6) an i

emergency power supply from OPERAllLE dicscl generators. At or below 80% of RNIED l

TIIERMAL POWER, there is a corresponding decrease in decay heat which compensates for the loss j

ofinjection from one charging pump assumed in the Small Break LOCA analyses, j

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i A1TACHMENT (3) i TECHNICAL SPECIFILATION PAGES c

UNIT 2 3/4 1-17 3/4 1-20 i

3/4 1-21 3/4 1-22 B3/41-2 B3/41-3 b

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3/4.1 REACTIVITY CONTROL SYSTEMS 3/*.1.2 B0 RATION SYSTEMS Boric Acid Pumps - Operatinc LIMITING CONLIEION FOR OPERATION t leastThe boric acid pump (s) in the boron injection flow 3.1.2.

Dg hath(s) requiredAPERABLE pursuant to Specification 3.1.2 shall be OPERA 5Lt anc capable of being powered from an OPERABLE em ency bus if the flow path through the boric a pump (s) in Specification 3 ;.2.2a is g]gg OPERABLE.

APPLICABILITY: H0 DES

, 3 and 4.

ACTION: With one boric acid pump required for the boron injection flow path (s) pursuant toJpecification 3.1.2.hinoperable, restore the boric.%'g Ep4 Mcid pump to OPERABLE status within 72 hMrs 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 3% Ak/k at 200 F; restore the above required boric acid pump (s) 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 .

Md SURVEILLANCE REQUIREMENTS 4.1.2.6 No additional Surveillance Requirements other than those required by Specifications 4.0.5 and 4.1.2.2.

CALVERT CLIFFS - UNIT 2 3/4 1-17 Amendment No.-149

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AND, j

When in MODE 1 > 807o of RATED TIIERMAL POWER b.

The boric acid pt'mp(s) in the boron injection flow path (s) required to be OPERAllLE pursuant to Specification 3.L2.8.a shall be OPERAllLE and capable of being powered from an OPERAllLE emergency bus.

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3/4.1 REACTIVITY CONTROL SYSTEMS N

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3. I. Q.8 c'

3/4.1.2 BORATION SYSTEMS

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Borated Water Sources - Operating LIMITING CONDITION FOR OPERATION

\\.1.2.8 At least one of the following two combinations of borated wate sources shall be OPERABLE:

a.

Two boric acid storage tank (s) and one associated heat racing circuit per tank with the contents of the tanks in ordance h with Figure 3.1.2-1 and the boron concentration 1 ted to < 8%,

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b.

Baric Acid Storage Tank 22 OPERABLE per Spe fication 3.1.2.8.a and the refueling water tank with s

k%inimumcontainedboratedwater 1.

olume of 400,000 gallons, 2.

A bNron concentration of betwe 2300 and 2700 ppm,

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3.

Aminihmsolutiontemperat e of 40*F, and

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A maximum \\ solution tempe ture of 100 F in H0DE 1.

4.

NF APPLICABILITY: MODE 1 >

of RA THERMAL POWER.

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ACTION:

With neither combin u(on of borated water sources OPERABLE but at a.

least two of the i dividual borated water sources OPERABLE, restore at least ne of\\the combinations defined in Specification 3.1.2.8 to OPE LE statns within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or reduce power to less than 80% f RATED TH $ L POWER within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months .

b.

With only e barated water \\purce OPERABLE, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months either restore a least two of the friqividual borated. water sourras to OPERABL status or reduce power \\below 80% of RATED THERMAL POWER and co. ply with Specification 3.l.2.9.

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CALVERT CLIFFS - UNIT 2 3/4 1-20 Amendment No. 149

3/4.1 REACTIVITY CONTROL SYSTEMS

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SURVEILLANCE REQUIREMENTS 4.1.2.8 At leist two borated water sources shall be demo ated OPERABLE:

At least dnce per 7 days by:

a.

1.

Verifying the baron concentr.

on in each water source, s

2.

Verifying the contain orated water volume in each water source, and

's 3.

Verifying th oric acid storage tank solution temperature.

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b.

At least on per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months by fatifying the RWT temperature when the outsi air temperature is < 1 F.

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l CALVERT ".LIFFS - UNIT 2 3/4 1-21 Amendment No. 49

INSERT B 3/4.1 REACTIVITY CONTROL SYSTEMS 3/4.1.2 BORATION SYSTEMS l

Charoing Pumo ECCS Subsystem l

LIMITING CONDITION FOR OPERATION i

3.1.2.8 As a minimum, the following equipment shall be OPERABLE:

a.

Boric Acid Storage Tank 12 and its associated heat tracing circuit shall be OPERABLE per Specification 3.1.2.9.a and the baron injection flow path via Boric Acid Pump 12 from Boric Acid Storage Tank 12 shall be OPERABLE per Specification 3.1.2.2.a and Soecification 3.1.2.6.

AND, One of the following:

b.

The boron injection flow path from Boric Acid Storage Tank 12 via a gravity feed connection shall be OPERABLE per

+

Specification 3.1.2.2.a, or, Boric Acid Storage Tank 11 and its associated heat tracing circuit shall be OPERABLE per Specification 3.1.2.9.a and the

~ boron injection flow path from Boric Acid Storage Tank 11 via a gravity feed connection shall be OPERABLE per Specification 3.1.2.2.a.

APPLICABILITY: MODE 1 > 80% of RATED THERMAL P0kER.

ACTION: With only one of the required combindions of borated water l

sources and flow paths OPERABLE, restore two required combinations of borated water sources and flow paths to OPERABLE s+atus within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months or reduce power to less than 80% of RATED THERMAL ?miER within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and comply with Specifications 3.1.2.2, 3.1.2.6 and 3.1.2.9 as applicable.

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CALVERT CLIFFS - UNIT 2 3/4 1-20 Amencment No.

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INSERT B 3/4.1 REACTIVIT( CONTROL SYSTEMS -

SURVEILLANCE REQUIREMENTS 4.1.2.8 No additional-Surveillance Requirements other than those required by Specifications - 4.0.S, 4.1.2.2, and 4.1.2.9.

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CALVERT CLIFFS - UNIT 2 3/4 1-21 Amendment No.

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g 3/4.1 REACTIVITY CONTROL SYSTEMS _

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3/4.1.2 BORATION SYSTEMS Borated Water Sources - Operatina l

LIMITING CONDITION FOR OPERATION 3.1.2.9 At least two of the following three borated water sources shall be t

OPERABLE:

}

a.

Two boric acid storage tank (s) and one associated heat tracing _

i circuit per tank with the contents of the tanks in accordance s

with Figure 3.1.2-1 and the boron _ concentration limited to 5 8%,

and b.

The refueling water tank with:

1.

A minimum contained borated water volume of 400,000 gallons, l

k 2.

A baron concentration of between 2300 and 2700 ppm, i

i 3.

A minimum solution temperature of 40 F, and 4.

A maximum solution temperature of 100 F in MODE 1.

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APPLICABILITY: MODES 2, 3 and 4.

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ACTION: With only one borated water source OPERABLE, restore at least two -

l borated water sources 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 3% Ak/k at 200 F; restore at least two borated water sources to OPERABLE status within the ~next 7 days or be in COLD i

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

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w CALVERT CLIFFS - UNIT 2 3/4 1-22 Amendment No. 149

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3/4.1' REACTIVITY CONTROL SYSTEMS i

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BASES 3/4.1.1.3 Boron Dilution A minimum flow rate of at least 3000 GPM provides adequate mixing, prevents stratification and ensures that reactivity changes will be gradual during boron concentration reductions in the Reactor Coolant System. A flow rate of at least 3000 GPM will circulate an equivalent Reactor Coolant System i

volume of 9,601 cubic feet in approximately 24 minutes. The reactivity change rate associated with baron concentration reductions will therefore be within the capability of operator recognition and control.

3/4.1.1.4 Moderator Temperature Coefficient (MTC)

The limitation on MTC are provided to ensure that the assumptions used in the accident and transient analyses remain valid through each fuel cycle.

The surveillance requirements for measurement of the MTC during each fuel cycle are adequate to confirm the MTC value since this coefficient changes slowly due principally to the reduction in RCS boron concentration associated with fuel burnup. The confirmation that the measured HTC value is within its limit provides assurances that the coefficient will be maintained within acceptable values throughout each fuel cycle.

3/4.1.1.5 Minimum Temperature for Criticality gg This specification ensures that the reactor will not be made critical with the Reactor Coolant System average temperature less than 515 F.

This limitation is required to ensure 1) the moderator temperature coefficient is within its analyzed temperature range, 2) the protective instrumentation is within its nonnal operating range, 3) the pressurizer is capable of being in an OPERABLE status with a steam bubble, and 4) the reactor pressure vessel is above its minimum RTm temperature.

3/4.1.2 BORATION SYSTEMS SM MSM O Thet oron Injecti n Syst ensures B

atnegativereactivitycont[olis 1

bl avai14 e durin ach MOD of facility operation. The system a owing a S AS (e.g., du ing a Small B(eak LOCA))so provide coolant flow fo to t

s supplement flo from the Saf'e.ty Injecti n System.

TheNmall

'reak LOCA S

analyses 'assur flow from a slogle ch ging pump, accoun41ng or measuremenk certainties and flow m,-distribution effects n calculating a conservatt e value of charging \\(1 actually delivered t the RCS. The t

components e' quired to perform thi* function include 1) b hted water sources, 2 chhrging pumps, 3) se: Fate flow paths, 4) b ricNicid pumpr.

5) associ ted heat tracing syste., ahd 6) an emergency power \\ supply from OPERABLE iesel generators.

N CALVERT CLIFFS - UNIT 2 B 3/4 1-2 Amendment No. 149

i 3/4.1 REACTIVITY CONTROL SYSTEMS

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BASES M ~ a r*

[F

__ With the RCQvgm3e ature above 200 F, a minimum of two

+_.. a an fit'em are provided to ensure single nal iTs6H]ie)d failure renders one of the systems j

redundant Beeen.n h.cn t

capability '

e eh 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 from all operating conditions of 3.0% Ak/k after xenon decay and cooldown to 200 F.

The maximum boration capability requirement occurs at E0L from full power equilibrium xenon conditions and requires boric acid solution from the boric acid tanks, the concentration and volume of which are met by the range of values given in Specifications 3.1.2.8 and 3.1.2.9, or 55,627 gallons of 2300 ppm borated water from the refueling water tank. However, to be consistent with the ECCS requireraents, the RWT is required to have a minimum contained volume of 400,000 gallons during MODES 1, 2, 3 and 4.

The maximum baron concentration of the refueling water tank shall be limited to 2700 ppm and the maximum boron concentration of the boric acid storage tanks shall be limited to 8% to preclude the possibility of boron precipitation in the core during long term ECCS cooling.

borcd1 ors With the RCS temperature below 200 F, one ir eaic-ystem is acceptable gg4 without single failure consideration on th b 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 based upon providing a 3%

Ak/k SHUTDOWN MARGIN after xenon decay and cooldown from 200 F to 140 F.

This condition requires either boric acid solution from the boric acid tanks, the requirements of which are met by Specification 3.1.2.7, or 9,844 gallons of 2300 p m bora water from the refueling water tank.

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n The OPERABILITY of on "crca inje; tion ste during REFUELING ensures that this system is available for react ontrol while in MODE 6.

3/4.1.3 MOVABLE CONTROL ASSEMBLIES The specifications of this section ensure that (1) acceptable power distribution limits are maintained, (2) the minimum SHUTDOWN MARGIN is maintained, and (3) the potential effects of a CEA ejection accident are limited to acceptable levels.

i CALVERT CLIFFS - UNIT 2 8 3/4 1-3 Amendment No. 149 1

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INSERT C The Baration System is a subset of the Chemical Volume and Control System. The Boration System ensures that negative reactivity control is available during each 510DE of facility operation. Tlw system also provides coolant flow following a SIAS (e.g., during a Small Break LOCA) to supplement flow from the Safety Injection System. Above 80% of RATED TIIERSIAL POWER, the Small Break LOCA analyses assume flow from a single charging pump, accounting far measurement uncertainties and flow mal-distribution effects in calculating a conservative value of charging flow actually delivered to the RCS. Credit is only taken for the water inventory, no credit is taken for the injected boron. Above 80% of RATED TIIERNIAL POWER, two independent, redundant, and automatic boration systems are provided to ensure functional capability in the event an assumed failure renders one of the systems inoperable.

The components required to perform this function include 1) borated water sources, 2) charging pumps. 3) separate flow paths,4) boric acid pumps. 5) associated heat tracing systems, and 6) an emergency power supply from OPERAllLE diesel generators. At or below SOG of RATED TIIER51AL POWER, there is a corresponding decrease in decay heat u hich compensates for the loss ofinjection from one charging pump assumed in the Small Break LOCA analyses.

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ML20035C292

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