ML20011D508

Application for Amend to License NPF-6,modifying Tech Spec 4.9.8.1 to Reduce Min RHR Flow.Change Determined to Be Acceptable by Conservative Evaluations of Shutdown Cooling Pump long-term Min Flow Requirements for RCS Mixing

ML20011D508
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/15/1989
From:	Tison Campbell ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20011D509	List: ML20011D508 ML20011D511
References
2CAN128903, GL-88-17, NUDOCS 8912270339
Download: ML20011D508 (3)

Text

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e? - Arkinses f,,. Fow;r & Ught Company 425 West Capitol '

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• P O Box 551 1*. Uttle Rock, Arkansas 72203 Tel 501377 3525 4 T. G. Campbell -

Wee President 6 WCl0Af December 15, 1989 2CAN128903i U. SL Nuclear Regulatory Commission Document' Control Desk Mail Station P1-137-Washington, DC; 20555

Subject:

Arkansas' Nuclear One - Unit 2

-Docket No. 50-368

' License No..NPF-6 Generic'. Letter'83-17 Related TS Change Request -

~ Reduction in Minimum RHR Flow (TS 4.9.8.1)

[ ~ Gentlemen:

R. AP&L'sL90-day response to Generic Letter (GL) 88-17,. dated March 14, 1989 (0CAN038908),' describr:d our plans for addressing the six programmed enhancements recommended by the NRC conceraing the loss of decay heat removal: (OHR) . issue. . Item (5) of the GL 88-17 programmed enhancements

< recommended identification of: technical specifications (TS) that restrict or-

! limit the safety benefit of the actions-identified in the GL, and submittal of appropriate changes ~. Our response identified the TS requirements for.

s periodic verification of minimum shutdown. cooling (SDC) loop flow, Surveillance 5 Requirement (SR) 4.9.8.1, as not always appropriate, and stated that we L Lanticipated proposing a change to this requirement within six months. Our letter dated November 6, 1989 (2CAN118903) informed you that we anticipated this submittal following the next regular Safety Review Committee meeting.

AP&L has determined that -a reduction in the minimum SDC loop flow f rom 3000 to 2000 gpm i_s appropriate', and proposes to modify TS SR'4.9.8.1 accordingly.

' ~ This change was determined to be acceptable by conservative evaluations of the SDC pump long term minimum flow requirements and minimum flow requirements for

-RCS. mixing as.related to the SAR' RCS Boron Dilution Accident Analysis. The proposed minimum flow reduction meets these requirements, while providing the benefit of greater margin to SDC suction line vortexing during operation with lowered RCS levels, a concern discussed in GL 88-17. The proposed flow

' limit was.also' verified to be conservative by a SDC vortexing test performed during the past 2R7'. refueling outage. A copy of the croposed change is attached for your review and approval. Similar changes have been reviewed and approved by the NRC for other licensees.

In accordance with 10CFR50.91(a)(1), and using the criteria in 10CFR50.92(c),

AP&L has determined that the proposed change involves no significant i hazards consideration.. Our basis for this determination is also attached for your review. The circumstances of the proposed change are neither t exigent.nor emergency; however, prompt NRC processing is requested. D 9,

8912270339 891215 An Entergy Company PDR.ADOCK.05000368 P

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. PDC

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c-O. S. NRC Page 2

, December 15, 1989 AP&L requests that the' effective date for this change be 30 days after NRC issuance of'the amendment to allow for distribution and procedural revisions.necessary to implement this change.

Very truly yours, Af

_T. G. Campbell TGC/rbt -

Attachment cc: Mr. Robert Martin  !

U. S. Nuclear Regulatnry Commission i Region'IV .!

611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76011 -)

NRC Senior Resident Inspector  !

Arkansas Nuclear One - ANO-1 & 2 l

. Number 1, Nuclear Plant Road Russellville, AR 72801 l

Mr. C.-Craig Harbuck NRR Project Manager, Region IV/ANO i U. S. Nuclear Regulatory Commission NRR Mail Stop 13-D-18 .

One White Flint North  !

11555 Rockville Pike  !

Rockville, Maryland 20852 Mr. Chester Poslusny i NRR Project Manager, Region IV/ANO-2 l n

U. S. Nuclear Regulatory Commission l NRR Mail Stop 13-D  !

One White Flint North 11555'Rockville Pike Rockville, Maryland 20852 l Ms. Greta Dicus, Director

, Division of Radiation Control and Emergency Management Arkansas Department of Health  ;

4815 West Markham Street l Little Rock, AR 72201 l

)6 _ - . - - . . . , . . . .;--' -

!. 0' STATE OF-ARKANSAS )

) SS COUNTY OF PULASKI )

I, T. G. Campbell, being duly sworn, subscribe to and say that I am

. Vice President, Nuclear for Arkansas Power & Light Company; that I have full authority to execute this oath; that I have read the document numbered 2CAN128903 and know the contents thereof; and that to the best of my knowledge, information and belief, the statements in it are true.

_/W T. G. Campbel SUBSCRIBED AND SWORN T0 before me, a Notary Public in and for the County and State above named, this 1 day of 4hb 1989.

N&L~. -

Notary Public -

My Commission Expires:

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