ML20128B643

Proposed Rev to TS for Cycle 7,changing Required Shutdown Margin in Mode 5 in TS 3.1.1.1

ML20128B643
Person / Time
Site:	Wolf Creek
Issue date:	01/28/1993
From:	WOLF CREEK NUCLEAR OPERATING CORP.
To:
Shared Package
ML20128B635	List: ML20128B631 ML20128B643
References
NUDOCS 9302030124
Download: ML20128B643 (3)

Text

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' Attachment to NA 93'-0013 C

'Pagef1of4' REACTIVITY CONTROL SYSTEMS FLOW PATHS -'0PERATING 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 Storage System via a boric acid transfer-pump and a centrifugal cnarging pump to the Reactor Coolant System, and *

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

APPLICABILITY: MODES 1, 2. and 3.*

ACTION:

With only one of the above required boron injection flow paths to the Reactor Coolant System OPERABLE, restore at least two boron injection flow patns to the Reactor Coolant System to OPERABLE status within-72 hours or be in at least-HOT STANOBY and borated to a SHUT 00WN MARGIN equivalent to at least

-4:*cak/k at 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 two flow oaths to OPERABLE status within the next 7 days or be in COLD SHUTOOWN within'the 4,.--next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br /> . .

((.3?o RVEILLANCE REOUIREMENTS 4.1.2.2 At least two of the above required. flow paths shall be demonstrated OPERABLE:

a. 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 position;

b. At least once per 18 months during ' shutdown by verifying that each automatic valve in the flow path actuates to its correct position on a Safety Injection test signal; and

c. At least once per 18 months by verifying-that the flow cath recuired by Specification 3.1.2.2a. delivers at least 30 gpm to the Reactor Coolant System.

"The provisions of Specifications 3.0.4 and 4.0.4 are not aoolicable for entry into MODE 3 for the centrifugal charging pump declared -inocerable cursuant to Specification 4.1.2.3.2 provided that the centrifugal charging pumo is restored to OPERABLE status within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or prior to the temcerature of one or more of the RCS cold legs exceecing 375*F, whichever comes first.

WOLF CREEK - UNIT 1 3/4 1-3 9302030124 930128 PDR ADOCK 05000482 p PM ,

Attachm:nt to NA 93-0013 Page 2 of 4

REACTIVITY CONTROL SYSTEMS '

BO, RATED WATER SOURCES - OPERATING LlHITING CONDITION FOR OPERATION 3.1.2.6 As a minimum the following borated water sources shall be OPERLE as required by Specification 3.1.2.2 for MODES 1, 2 and 3 and one of the following borated water sources shall be OPERABLE as required by Specifica-tion 3.1.2.1 for H00E 4:

a. A Boric Acid Storage System with:

1) A minimum contained borated water volume of 17,658 gallors,

2) Between 7000 and 7700 ppm of boron, and

3) A minimum solution temperature of 65'F.

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

1) A minimum contained borated water volume of 394,000 gallons

2) Between 2400 and 2500 ppm of boron. l'

3) A minimum solution temperature of 37'F, and

4) A maximum solution temperature of 100'F.

APPLICABILITY: HODES 1, 2, 3, and 4.

ACTION: 1.

a. With the Boric Acid Storage System inoperable and being used as one of the above required borated wate sources in H00E 1. 2 or 3, restore the storage system to OPERABLE atus within 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 STAN0BY within t' a next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and borated to a SHUTOOWN MARGIN equivalent to at least B-Ak/k at 200*F; restore the Boric Acid Storage System to OPERABLE status within the next 7 days or be in COLD SHUT 00WN within the next 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />,

b. With the RWST inoperable in H00E 1, 2, or 3, restore the tank to OPERABLE status within I hour or be in at least HOT STANOBY 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 />.

c. With no borated water source OPERABLE in NODE 4, restore one borated water source to OPERABLE status within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> or be in COLD SHUT 00VN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

l-WOLF CREEK - UNIT 1 3/4 1-12 Amendment No. 23 l

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Attachment to NA 93 0013 Page 3 of 4 3/4.1 REArTIVITY CONTROL SYSTEMS BASES 3/d.1.1 BORATION CONTROL 3/4.1.1.1 and 3/4.1.1.2 5 UTDOWN MARGIN A sufficient SHUTDOWN MARGIN ensures thatt (1) the reactor can be made .

suberitical fr ciated with po,om all accident stulated operating conditions, conditions (2) the rsactivity are controllable within transients acceptable asso-limits, and (3) the reactor will be maintained sufficiently suberitical to preclude inadvertent criticality in the shutdovn condition.

, SHUTDOWN MARGIN requirements vary throughout core life as a function of ,

fuel depletion, RCS boron concentration, and RCS T,y . The most restrictive condition occurs at EOL, with T,yg at no load operat ng temperature, and is associated with a postulated steam line break accident and resulting uncon-trolled RCS cooldewn. In the analysis of this accident, a minimum SHUT 00WN MARGIN of 1.3% ok/k is r'equired to control the reactivity transient.

Accordingly, the SHUTOOWN MARGIN requirement is based upon this limiting condition and is consistent with FSAR safety analysis assumptions. With T,yg less than 200'F, the reactivity transients resulting from a postulated steam line break cooldown are minimal and a,1!It'Ak/k SHUTDOWN MARGIN provides adequate protection.

3/4.1.1 3 MODERATOR TEMPERATURE COEFFICIENT 3

The limitations on moderator temperature coefficient (MTC) are provided to ensure that the value of this coefficient remains within the limiting condition assumed in the FSAR accident and transient analyses.

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

WOLF CREEK - UNIT 1 B 3/4 1-1

Attachment to NA 93-0013

,Page,4 of 4 ,

REACTIVITY CONTROL SYSTEMS BASES BORAT10N SYSTEMS (Continued)

With the RCS temperature below 200'F, one Boration 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 changes in the event the single Boron Injection System becomes inoperable.

The limite.:.'ve 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 in H0 DES 4, 5, and 6 provides assurance that a mass addition pressure transient can be relieved by the opera- ,

m tion of a single PORV or an RHR suction relief valve.

Ilbbslhe_ boron _capabilityrequiredbelow200'Fissufficienttoprovidea

^

SHUTDOWN MARGIN of t1Fak/k af ter xenon decay and cooldown from 200*F to 140'T. This condition requirec either 2968 gallons of 7000 ppm borated i water from the boric acid storage tanks or 14,071 gallons of 2400 ppm borated I water from the RWST.

The contained water volume limits include allowance for water not available because of discharge line location and other physical characteristics. In the case of the boric acid tanks, all of the contained volume is considered usuabic. The required usable volume may be contained in either or both of the boric acid tanks.

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

, wit.hin containment after a LOCA. ,Ihis pH band minimizes the evolution _of iodine and minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

The OPERABILITY of one Boration System during REFUELING ensures that this system is available for reactivity control while in H0DE 6. >

344.1.3 HOVABLE CONTROL ASSEMBLIES The specifications of this section ensure that: (1) acceptable power distribution limits are maintained, (2) the minimum SHUTDOWN MARGIN is main-tained, and (3) the potential effects of rod misalignment on associated acci-dent ana'yses are limited. OPERABILITY of the control rod position indicators is required to determine control rod positions and thereby ensure compliance with the control rod alignment and insertion limits. Verification that the Digital Rod Position Indicator agrees with the demanded position within i 12 steps at 24, 48, 120, and 228 steps withdrawn for the Control Banks and 18, 210 and 228 steps withdrawn for the Shuthwn Banks provides assurances that the Digital Rod Position Indicator is operating correctly over the full range of indication. Since the Digital Rod Position System does not indicate the actual shutdown rod position betwean 18 steps and 210 steps, only points in the indicated ranges are picked for verification of agreement with demanded position.

WOLF CREEK - UNIT 1 B 3/4 1-3 Amendment No. 23

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