ML20076E214

Proposed Tech Specs 3/4.3.1.2 Re Min Shutdown Margin & 3.1.2.2 Re Operability of Boron Injection Flowpaths to RCS

ML20076E214
Person / Time
Site:	Comanche Peak
Issue date:	08/09/1991
From:	TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML20076E211	List: ML20076E208 ML20076E214
References
NUDOCS 9108190084
Download: ML20076E214 (8)

Text

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MARKED UP TECHt41 CAL $PECIFICATIONS-Enclosure 2 to 1XX-91299  !

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A 9108190084 910809

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Enclosure 2 to 1XX-91299 '

Page 2 of 8 REACT:vl+, C:9icCL 3,$tEus SHUTDOWN MARGIN T LESS TWAN OR EQUAL TO 200er LIMITING CONDITION FOR OPECATION 3.1.1.2 The 3rVTDC'aN MARGIN shall be greater than or ecual to iT';i, )

APPLICAB]LITY: MOCE 5. I

't_ v'5 _-

0, ACTICN:

1.31e With the SHUTDOWN MARGIN less tha f jdIa /k. immediately initiate anc continue boration at greater than or equal to 30 gpm of a solution containing greater than or equal to 7,000 ppm boron or equivalent until the required SHU100WN MARGIN is restored. i SURVEllLANCE REQUIREMENTS a .1. 4 The SHUTDOWN MARGIN shall be cetermined to be greater than er eac31 t o )X's 'k ;

/* a. Within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> af ter detection of an inoperab'e control rod (l) and at least once per 12 nours thereafter while th- oc(s) is inoperacle .

If the inoperaDie control red is immovable untrippable, the SHUTDOWN MARGIN shall be verified acceptabi- .ith an increased allowance for the withorawn worth of the im eable or untrippable control rod (s); and

c. At least once per 24 nours by consideration of the following factors:

1) Reactor Coolant System boron concentrat'en,

2) Control rod position,

3) Reactor Ccolant System average temperature,

4) Fuel burnup based on gross thermal energ/ generation,  ;

5) xenon e acentration, and ,

6) Samarium concentration. I I

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t COMANCHE PEAK

• UNIT 1 3/4 1 3 1

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l Q.g k w z ? *v TXX-91299 age 3 of B J!:.. Q .M :- S'5'(*5

N f 5 OPERATING ti-1; 3G CONDITION FOR OPERATICN 3.1.2.2 At least t o of the fol'o.ing three t'oron injection flow paths shal' ce OPERABLE:

a. The flow path from the boric scid storage tarls via either a boric acid transfer puftp Or a gravity feed connection and a charging pu p to the Reactor Coolant System (RCS), and

b. Two flow paths from the refueling water storage tank via centrifugal charging pumps to the RC5 APPLICABILITC MODES 1, 2, 3, and 4.*

ACTION:

With only one of the above required boron injection flow paths to the RCS OPERABLE, restore at least too boron injectjomf4cy paths to the RC$ to OPERABLEstatuswithin72hoursorbein9t'lefstE STANDBY and borated to a SHUTDOWN MARGIN equivalent to at leQt A M,( 200*F within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />; restore at least t o flow paths to OPE 'E status within thenext7daysorbeinCOLDSHUTDOWNwi\hin the next 0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br />.

( /.3 %

SURVEILLANCE REQUIREMENTS 4.1. 2. 2 At least t'.o of the aco.e required flow paths shall be demonstrated OPERABLE:

a. At least once per 7 days by verifying that tt'e temperature o' the flow path from the boric acid storage tanks is greater than or eoual to 65 F when it is a required water source;

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

c. At least once per 18 months by verifying that the flow path required by Specification 3.1.2.2a, delivers at least 30 gpm to the RC5

• A maximum of two charging pumos shall be OPERABLE whenever the temperature of one or more of the RCS cold legs is less than or equal to 350'F except hen Specification 3.4.8.3 is not applicable. An inoperable pump may be energized for testing provided the discharge of the pump has been isolated from t'e RCS by a closed isolation valve (s) .ith power removed f rom the valve opera *.:<t i) or by a manual isolation sa'Se(s) secured in the closed position.

l COMANCHE PEA [ UNii 1 3.4 1-2

Enclosure 2 to TXX-91299 I

,P, age 4 of 8 i i

1. EAC':.:' CN't. 5's'!v5 CHARGING PUMPS OPERATING LIMITING 00N0! TION FOR OPERATION I i

3.1.2.4 At least t o centrifugal enarging pumps shall be OPERABLE.

f Ao0LICABIL:Ti: MOCES 1, 2, 3*, and 4** *. v> j ACTICN: b With only one charging pump OPERABLE, r store at Igast two charging pumps to l OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or by laatleasp07STANDBYandboratedtoa  ;

SHUT 00WN MARGIN equivalent to at led 54,M Jk/k at 200'F witnin the next  ;

6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />;restoreatleasttwoenargindpsmpsdeOPERABLEstatuswithinthenext 7 cays or be in COLD SHUTDOWN within the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />. ,

i SURVE!LLANCE REQUIREMENTS  !

i 4.1.2.4.1 The required centrifugal charging pump (s) shtll be demonstrate

OPERABLE by testing pursuant to Specification 4.0.5. .

4.1.2.4.2 The required positive dis 013 cement charginc-pump shall be  ;

demonstrated OPERABLE by testing pursuant to Specific . ion 4.1.2.2.c. '

4.1.2.4.3 Wheneser the temperature of one or more o+ *.re Reactor Coolant System (RCS) cold legs is less than or equal to 350** a maximum of two charging pumps shall be CPERABLE. except when Specif'.ition 3.4.8.3 is not  !

applicaDie.

j When required, one charging pu.np shall be oemonstrated inoperable # at least f once per 31 cays by verifying that the motor circuit breakers are secureo in the open position, i

• The provisions of Specifications 3.0.4.Jnd 4.0.4 are not applicable for entry [

into MODES 3 anti 4 for the charging pumb declared inoperable pursuant to '

Specification 3.1.2.4 provided the charging pun.p is restored to OPERABLE [

5tatus within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> after entering MODE 3 or prior to the temperature of l one or more of the RCS cold legs exceeding 375'F, .nichever comes first. .

• • In MODE 4 the positive displacement pump may be used in lieu of one of the required centrifugal charging pumps.

t i An inoperable pump may be energized for testing provided the discharge of ,

the pump has been isolated from the RCS by a closed isolation valve (s) itn .

power removed from thi valve operator (s) or by a manual isolation val.e(s)  :

secured in the closed position. '

i COMANCHE DEAK - UNIT 1 b 4 1- 10 j

Enclosure 2 to TXX 91299

. Page 5 of 8 REAC7!v C N* COL Sv57tus BORATED WATER SOURCES - OPERATING LIMITING CANOITION FOR OPERATION 3.1.2.6 As a minimum, the following borated water source (s) shall be CFERAELE as requireo by Soecification 3 L 2.2:

a. A boric acid storage tant with:

1) A minimum indicated borated water level of 50%,

2) A minimum boron concentration of 7000 ppm, and

3) A minimum solution temperature of 65'F.

b. The refueling water storage tank (RWST) with:

1) A minimum indicated borated water level of 95%,

2) A boron concentration between 2000 ppm and 2200 ppm,

3) A minimum solution temperature of 40'F, and

4) A maximum solution temperature of 120*C APPLICABILI?Y: MODES 1, 2, 3, and 4 ACTICN:

a. With the Doric acid storage tank inoperable and being used as one h above required borated water sources, restort ,he tant to

[j CPEnABL T us witnin 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY within A t_. Dent 6 h rs and borated to a SHVIDOWN MARGIN equivalent to

/.3 N at least M /k'at 200'F; restore the boric acid storage tank to us thin the next 7 days or be in COLD SHUTDOWN within

b. With the RWST inoperable, restore the tank to OPERABLE status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUT 00WN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

4 3/4 1-12 COMANCHE FEAK - UNIT.1

Enclosure 2 to TXX-91299

.(age 6of8 3,t 1 :t:: :.:  ::st:et systrus EASES 3/4 1.1  !: RAT::N : N'RCL 3/A.1.1.1 nac 3 J.;.1.2 5HUTDOWN MARGIN A sufficient SHUTDOWN MARGIN ensures that: (1) the reactor can ce tace subtritical from all operating conoitions, (2) the reactivity transients asso-ciated with postulated accident conditions are controllable within acceptable 3 limits, and (3) the reactor will be maintained sufficiently subcritical to preclude inadvertent criticality in the shutdown condition.

$HUTDOWN MARGIN reovirements vary throughout core life as a function of fuel depletion, RCS boron concentration, and RCS T,yg. The most restrictive condition occurs at EOL, with 7,,9 at no load operating temperature, and is associated with a postulated steam line break accident and resulting uncon-trolled RCS cooldown. In the analysis of this accident, a mir' mum SHUT 00hN ,

MARGIN of 1,6* l,,dk is required to control the reactivity transient. i Accordingly, the SHUTDOWN MARGIN requirement is based upon this limiting condition and is e nsistent with FSAR safety a3aly11s_A n urotions. With ' '

less than 20f f the-teett+r44-y-4+an& dent &--rnutth 9 froma-pestehtt<htte (ILse-tesak 4c440*a-eeWm:I e iu a 1*c-::ttt-$Ht1TOOWtiAR0iff prev 4es

\doeevett-pMtec t4on. -

IN fitt A _

Since the actual overall core re' activity balance :omparison required by 4.1.1.1.0 cannot be performed until af ter criticalit:. s attained, this comoarison is not required (and the provisions of Spec fication 4.0.4 are not applicaole) for entry into any Operational Mode within the first 31 EFFC follo.ing N tial fuel load or refueling, 314.1.1.3 MODERATOR TEMPERATURE COErFICIENT The limitatiens on moderator temperature coefficient (MTC) are provideo to ensure that the value of this coefficient remains within tne limiting condition assum

• in the F5AR accident and transient analyses.

The MTC values of this specification are applicable to a specific set of plant conditions; accordingly, verification of MTC values at conditions other than those explicitly stated will require extrapolation to those conaitions in order to permit-an a: curate comparison.

The most negative MTC value equivalent to the most positive moderator density coefficient (MDC) was obtained by incrementally correcting the MDC used in the FSAR analyses to nominal operating conditions. These corrections COMANCHE PEAK

• UNIT 1 2 3/4 1 1

Enclosure 2 to TXX-91299 Page 7 of 8 INSERT A a SHU100WN MARGIN of 1.3X a k/k provides adequate protection and is based on the results of the boron dilution accident analysis.

Enclosure 2 to 1XX-91299 l Page 8 of 8 REaCTIV! :N :L 5'5'EuS.

BASES BCRATICN 5< STEMS (Continued) witn tne RCS tetoerature belew 200*F, one Boron Injection System is acceptable .itnout single failure consideration on the basis of the stable reactivit/ co cition of the reactor and the additienal restrictions orenicitug CORE ALTERATICN5 and positive reactivity char.ges in the event the single Boron Injection System becomes inoperable.

The limitation for a maximum of two charging Pumps to te OPERABLE and the requirement to verify one charging pump to be inoperable below 350'F provides assurance that a mass addition pressure transient can be relieved by the operation of a single PORV.

The limitation for minimum solution temperature of the borated water sources are sufficient to pre boron concentratio / gent'9JFTC) acid crystallization with the highest allo aDie jg, The boron ca sa ility reyfired below 200'F is suf ficient to provide a SHUTOOWN MARGIN of 7.' Sk/Jrif ter menon decay and cooldown f rom 200'F to 140 F.

This condition reh W ei either 1.100 gallons of 7000 ppm borated water + rom the boric acid storage tanks or 7,113 gallons of 2000 ppm borated water from the RWST.

As listed below, the required indicated levels f: the boric acid storage tanks and the RWST include allowances for recuired/an! ~j tical volume, unusaole volume, measurement uncertainties (which include inst- cent error and tank tolerances, as applicable), system configuration requ 'ements, and other required volume.

Tank MODE 5 Ind. Unusable Required Measurement System Other sevel volume Volume Uncertainty Config. (gal)

(gal) (gal) (gal)

RWST 5,6 2 4'. 45,494 7,113 4% of span 57.957 N<A 1,2,3,4 95% 45,494 70.702 4% of span N/A 357,535' Boric 5,6 10% 3,221 1,100 6% of span N/A N/A Acid 5,6 20% 3,221 1,100 6% of span 3.679 N/A Storage (gravity feed) 1,2,3,4 Tank 50% 3,221 15,700 6% of span N/A N/A The OPERABILITY of one Boron Injection System during REFUELING ensures that this system is available for reactivity control while in MODE 6.

• Additional volume required to meet Specification 3.5.4.

COMANCHE FEAK - UNIT 1 B 3/4 1-3

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