ML20012A423

Application for Amends to Licenses DPR-62 & DPR-71,revising Tech Spec Section 3.7.1.2 to Clarify & Expand Svc Water Pump Operability Requirements,Thereby Better Reflecting Plant Design

ML20012A423
Person / Time
Site:	Brunswick
Issue date:	02/28/1990
From:	Cutter A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20012A424	List: ML20012A423 ML20012A426
References
NLS-90-043, NLS-90-43, NUDOCS 9003090511
Download: ML20012A423 (7)

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Caronna Power & Light Company P.o. Box 1551. Raleigh. N o. 27602 SERIAL: NLS-90-043 '

10CFR50.90-

- 85TSB09 FEB 2 81990

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r A B CUTTER .

. V6ce President a Nuclear Services Department ,

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' Uriited States Nuclear' Regulatory Commission ATTENTION: -Document Control Desk ,

' Washington,:DC 20555 I

BRUNSWICK STEAM ELECTRIC PLANT, UNIT NOS. 1'AND 2  :

' DOCKET NOS. 50-325 & 50-324/ LICENSE NOS. DPR-71 & DPR-62 i REQUEST FOR LICENSE AMENDMENT - SERVICE WATER SYSTEM Gentlement In accordance with the Code of Federal Regulations, Title 10, Parts 50.90 and.-

2.101,' Carolina Power & Light Company (CP&L) hereby requests a revision- to .the 1 LTechnical Specifications for the Brunswick Steam Electric Plant (BSEP),

Units 1 and:2. [

The proposed amendment revises Technical Specification Section 3 7.1.2 to -

clarify and expand the service water pump operability requirements, thereby better reflecting the plant design.- The_ current specification requires'the '

. service water system nuclear header'to be operable with at least three _,

operable' service water pumps.. The revised Specification wil.1 require _both the

nuclear and' the conventional headers .to be operable with two nuclear and two.

conventional service water. pumps capable of supplying the headers when the' .

unit'is in 0PERATIONAL CONDITIONS 1, 2, OR 3 When the unit'is in'0PERATIONAL'-

CONDITIONS 4 or 5- the number. of required pumps drops to any combination of two- ,

nuclear and/or conventional' service water pumps powered from separate emer- i

'gency buses provided that there are at least two operable nuclear service l water pumps per site.- A change to the Bases for Technical Specification ,

'Section '3/4.7.1 reflecting the proposed amendment is included for.your infor-ma tion.' .

Enclosure .1.provides a detailed description of the proposed changes and the-

--basis for the changes. l.

Enclosure 2' details.the basis for the Company's determination that the proposed changes do not involve a significant hazards consideration.

Enclosure 3 provides the proposed Technical Specification pages for Unit.1.

-Enclosure'4 provides the proposed Technical Specification pages for Unit 2.

The proposed amendment reflects the service water system as it is expected to 7 be configured in July 1990. Modifications to reduce nuclear to conventional header cross-tie leakage are in progress on Brunswick-2 with post-modification 0

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i testing to be completed during the current Brunswick-2 Reload 8 outage. Also, additional ~ modifications to the conventional service water system are expected j to be completed by the end of' June 1990. Therefore, should the requested  !

i- amendment be issued prior to completion of these modifications, CP&L will'

. oontinue to administrative 1y control operation of the service' water system under the existing, conservative Technical Specification Interpretation. .]

Please roter any.questiona regarding this submittal.to Mr. M. R. Oates at (919) 546-6063 e

Yours vqry tru  !

- /

A. B Cutter a

.ABC/ MAT /eco (633ECC)

Enclosures:

1. Basis for Change Request

-2. 100FR50.92 Evaluation

3. . Technical Specification Pages - Unit 1

4. Technical Specification Pages - Unit 2 cc: Mr. Dayne H. Brown j Mr. S. D. Ebneter Mr. W. H. Ruland Mr. E. G. Tourigny i A. B Cutter, having been first duly sworn, did. depose and say that 'the information contained herein is true and correct to the best of his

'information, knowledge and belief; and the sources of his information are officers, employees,-contractors, and agents of Carolina Power & Light Company.

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• k ENCLOSURE-1 L

S -BRUNSWICK STEAM ELECTRIC PLANT, UNITS 1 AND 2

> NRC DOCKETS 50-325 & 50-324

< OPERATING LICENSES DPR-71 & DPR-62 REQUEST FOR LICENSE AMENDMENT SERVICE WATER SYSTEM BASIS FOR CHANGE REQUEST

. Proposed Change'

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The proposed amendment revisos Technical Specification Section 3.7.1.2 to clarify and expand the service water pump operability requirements, thereby better reflecting the plant design. The current specification requires the service water system nuclear header to be operable with at least three- I operable service water pumps. The' revised Specification will. require both the ..

nuclear and the conventional headers to be operable with= two nuclear-and two conventional service water pumps capable of supplying .the headers when the <

unit is in~0PERATIONAL CONDITIONS 1, 2, or 3 When the unit is in OPERATIONAL- [

CONDITIONS 4 or 5, the number of required pumps drops to any combination of {

two nuclear and/or conventional service water pumps powered from separate .[

emergency buses provided that'there ara at least two operable nuclear service j M water pumps per site. A change to the Bases for Technical Specification j F . Section 3/4.7.1 reflecting the proposed amendment is included for your -

information. -

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Basis e The service water system provides water for lubrication and cooling of selected equipment in the turbine building, reactor building, diesel generator building, chlorination system, circulating water system,. and screen wash M. system. The service water system is subdivided into two major headers which l are normally! operated independently. The nuclear header supplies service-m water to the nuclear or vital equipment in the reactor building and diesel

.g ' generator building and the conventional header normally supplies service -water '

to conventional equipment in the turbine building and other areas. Two i nuclear service water pumps supply the nuclear header and three conventional'  :{

service water pumps supply the conventional header for each unit. Cross- ,

connect valves allow the conventional pumps to' supply the nuclear header as y conditions dictate. The two types of pumps are identical except that the j g

nuclear service water pumps are capable of starting automatically during a i T

' design basis accident (DBA) while the conventional service water pumps must be I startedimanually'under these conditions. The diesel generators, which'are the only common service water load between the two units,.can receive cooling g water from the nuclear header of either unit. Either of the conventional or nuclear headers, or a combination of the two, can provide water to other loads including the residual heat removal (RHR) system room coolers, the RHR pump {

seal! heat exchangers, the core spray (CS) pump room coolers, and the RHR 1 service water cooling system. The service water system can also be cross-connected to the RHR system during emergencies to provide core flooding capabilities.

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, Presently, Technical Specification Section 3 7.1.2 requires each unit to have h

three service water pumps operable to supply the service water nuclear header. It'does not specify whether these pumps must be nuclear or conven-tional. The proposed change clarifies and expands on this requirement by t specifying that when in OPERATIONAL CONDITIONS 1, 2, or 3, there must be at j least two operable nuclear service water pumps and two operable conventional service water pumps capable of supplying the nuclear and conventional service water headers. When the unit is in OPEHATIONAL CONDITIONS 4 or 5 two service water pumps, capable of supplying the nuclear service water header, are I

-required to be operable. The two operable pumps can. consist of any combina- l tion of nuclear and/or conventional service water pumps, provided that there {

are at least two operable nuclear service water pumps per site. The reduced j requirements of OPERATIONAL CONDITIONS 4 and 5 account for reduced core decay  ;

heat and conventional service water loads and the Ctility to supply the diesel  ;

generators from 61ther unit's nuclear header.

During the initial stage of a DBA- (0-10 minutes), the service water system -

provides lube water and service water cooling to the diesel generators. The i service water system design allows either unit's nuclear header to supply j diesel generator cooling water. One pump can supply sufficient flow to cool  ;

all four diesel generators. Therefore, any combination of two operable ]

nuclear service water pumps associated with a unit in OPERATIONAL CONDITIONS 1, 2, or 3 and at least two operable nuclear service water pumps per site when one or both units are in OPERATIONAL CONDITIONS 4 or 5. As such, at least two operable nuclear service water pumps are always maintained to fulfill single ,

I failure criteria, thereby meeting emergency diesel generator cooling require-ments.

After the initial ten minutes of a DBA, additional loads require cooling

._ water. .These loads include RHR and CS pump room coolers, RHR service water heat exchangers, and RHR pump seal heat exchangers.. Evaluations have determined that the RHR pump seals, as well as the equipment in rooms serviced y the RHR and CS room coolers, remain within the manufacturt ra' temperature limits for the first ten minutes of a DBA. To meet the addi.ional loads during the post-ten minute stage of a DBA, a service water pamp on the affected unit (in addition to the pump supplying the diesels) must be placed in service. In order to assure single failure criteria is met, the proposed .

Technical Specification change requires two operable conventional service  ;

water pumps per unit while in OPERATIONAL CONDITION 1, 2, or 3. '

As discussed above, when in OPERATIONAL CONDITIONS 4 and 5, the reduced core decay heat load and the accessibility to the reactor building for manual operator action reduces the requirement for operable service water pumps after i an accident / transient to one. Therefore, when in OPERATIONAL CONDITIONS 4 or 5 two operable service water pumps (any combination of nuclear and/or conventional), capable of supplying the nuclear header, are required provided that there are at least two operable nuclear service water pumps per site.

i Maintaining two operable service water pumps while in OPERATIONAL CONDITIONS 4 or 5 assures single failure criteria are met and stipulating at least two operable nuclear service water pumps per site assures diesel generator cooling will be available.

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E -The allowed' out of service times and-compensatory measures established;in. the T'  : revised: Action Statements are consistent;withlor more conservative thanLthosel of; the _ existing Technica1 ' Specification -3.7.1.2.- . In particular, Action

<, Statement' a.2- for OPERATIONAL CONDITIONS' 1,' 2, . and 3 requires the unit. to bei in HOT SHUTDOWN within.12. hours and in COLD SHUTDOWN within the following 24:

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hours with no operable nuclear service water pumps; Analysis have1 been ~ per-W ' formed which' demonstrates that operation in .0PERATIONAL, CONDITIONS .1through L3,.'with no. operable nuclear ~ service water' pumps,~is1 acceptable provided that at'least two nuclear service water pumps are operable on the opposite unit'and; s p two: conventional pumps.are operable on.the affected unit.- In ' order to

! minimize the risk. of personnel error in administrating this requirement,, a F more conservative Action Statement has been established. -

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ENCLOSURE 2 BRUNSWICK STEAM ELECTRIC PLANT, UNITS 1 AND 2-NRC DOCKETS 50-325 & 50-324 OPERATING LICENSES DPR-71 & DPR-62 REQUEST FOR LICENSE AMENDMENT SERVICE WATER SYSTEM t ,

10CFR50-92 EVALUATION The Commission has provided standards in 10CFR50-92(c) for determining whether a significant hazards consideration exists. A proposed _ amendment to an operating' license for a facility involves no significant hazards consideration if operation'of the facility in accordance with the proposed amendment would not: (1) involve a significant increase in the probability or consequences of an accident .previously evaluated, (2) create _ the possibility of a new or dif-ferent kind of accident from any accident previously evaluateo, or (3) involve a significant reduction in a margin of safety. ' Carolina Power & Light Company

.has reviewed' this proposed license amendment request and determined that its -

adoption lwould not involve a significant hazards consideration. The bases for this determination are as follows: '

Proposed Changes The= proposed amendment revises Technical specification Section 3.7.1.2 to clarify.and expand the service water pump operability requirements, thereby better reflecting the plant design. The current specification requires the service water system nuclear heador to be operable with at least three 3 operable service water pumps. The revised Specification will require both the j nuclear and the conventional' headers to be operable with two nuclear and two conventional service water pumps capable of supplying the headers when the unit is in OPERATIONAL, CONDITIONS 1, 2, or 3 ^{

When the unit.is in OPERATIONAL CONDITIONS 4 or 5 the number of required pumps drops to any combination of two nuclear and/or conventional service water pumps powered from separate emer-gency buses provided that there are at least two operable nuclear service  ;

water pumps per site.

Basis j!

I The change does not involve a significant hazards consideration for the following reasons: j i

1. The proposed change allows the use of the present plant design and capaollities to ensure that an adequate supply of water is available for.

- cooling of the diesel generators and other vital equipment. The proposed change-requires both the nuclear and the conventional headers to be j operable with two nuclear and two conventional service water pumps capable >

of supplying the headers when the unit is in OPERATIONAL CONDITIONS 1, 2, or 3 These expanded requirements fulfill single failure criteria and will ensure the availability of service water for diesel generator cooling during the initial ten minute period of a design basis accident (DBA) and provide for sufficient service water capability for the post-ten minute

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. period of a EDBA' . When -the unit is in -OPERATIONAL CONDITIONS 4 or 5 the :

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w number.of required pumps drops to any combination of two nuclear and/or conventional' service water pumps,; provided that. there are' at 'least- two operable ~ nuclear service water pumps per site. Haintaining two operable.

service ' water' pumps while in OPERATIONAL CONDITIONS 4 or 5 assures single failure criteria are met and stipulating at least two operable nuclear service water pumps per site assures diesel generator cooling will be available.

The allowed out' of service times- and compensatory measures established -in-the revised Action Statement are consistent with those _of ~ the existing

' Technical ~ Specification 3 7.1.2.

-Based on this reasoning, the Company has determined that the proposed namendment1does not involve. a significant increase in the probability or

. consequences of an accident previously evaluated.

2. The service water system is designed to provide lubrication and cooling of equipment during norma 1' operations and'under accident conditions. The-system can also be cross-connected to the: RHR system during emergencies to:

provide core flooding capabilities. The service water system aids in mitigation of. an accident, but does not act as an initiator.of an accident.

sequence. The proposed chang'e does not affect -the ability -of;the service-water system to perform its intended . function. The requested amendment will' assure that the1 service water system will be available to provide an adequate supply of cooling water for .both normal and emergency opera-

' tion. Therefore, 'the proposed amendment does not create the possibility of a new or different' kind of accident from any accident previously evaluated.

3. .The proposed ' change clarifies and' expands 'the service water pump opera-bility requirements,to better reflect plant design. .These expanded requirements-will ensure the availability of service water for diesel-generator cooling during the initial' ten. minute period of a DBA = and provide for sufficient service water capability ~for the post-ten minute

,' . period of DBA. The proposed change will provide a higher level of

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' assurance of service water system availability for both normal operations and accident conditions. Therefore, the proposed change does not involvo a'significant' reduction in the margin of safety.

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