ML20154J935

Application for Amends to Licenses NPF-11 & NPF-18,providing Flexibility to Align Snubber Insp Intervals W/Refueling Outage When No Failures Encountered.Fee Paid

ML20154J935
Person / Time
Site:	LaSalle
Issue date:	09/09/1988
From:	Allen C COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20154J941	List: ML20154J935 ML20154J962
References
5061K, NUDOCS 8809230182
Download: ML20154J935 (5)

Text

--

7-

'.l f' _ / One

'N Commonwealth Edloon First National Plaza. Chicago, Illinois

\ v Address Reply to: Post Offce Box 767 Chicago, Ilhnois 60690 0767 September 9, 1988 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Subjects LaSalle County Station Units 1 and 2 Application for Amendment to racility Operating Licenses NPF-11 and NPF-18 Appendix A, Technical Specifications NRC Docket Nos. 50-373 and_50-374 Gentlemen:

Pursuant to 10 CFR 50.90, Commonwealth Edison is hereby applying for an emendment to Facility Operating Licenses NPF-11 and NPF-18, Appendix A, Technical Specifications. The purpose of this amendment is to provide flexibility to align snubber inspection intervals with refueling outage when no failures are encountered.

Attachment A contains background information and justification for the proposed change. Attachment B contains the proposed change to Technical Specifications. The proposed change has been reviewed and approved by both Onsite and offsite Review in accordance with Commonwealth Edison Company procedures. This amendment request has been evaluated in accordance with 10 CFR 50.92(c) and it was determined that no significant hasards consideration exists. That evaluation is doctanented in Attachment C.

Commonwealth Edison is notifying the State of Illinois of our application for this amendment by transmitting a copy of this letter and its attachments to the designated State Official.

In accordance with 10 CFR 170, a fee remittance in the amount of

$150.00 la enclosed.

/}oo /

G807D30182 000909 PDR ADOCg 05000373 /l l u,s/ check 'h!9 goo 73og

e

.o .

US NRC September 9, 1988 Please direct any questions you may have regarding this matter to this office.

Ve y truly yours, C. M. Allen Nuclear Licensing Administrator 1m Enclosure ces Attachments (A): Background and Discussion (B): Proposed Technical Specification Change (C): Evaluation of Significant Hazards Consideration cca LaSalle Resident Inspector P. Shemanski - NRR M. C. Parker - IDNS NRC Regional Administrator, RIII SUBSCRIBED AND S N to befo me i day of , 1988

.Moea_

Notary Public

{

l l 5061K

a ATIACBGNT A TECHNICAL SPECIE.ICAIIfM_CliANGE REQUEST LASALLE COUNTY. STATION UNITS 1 AND 2 BACKGRQUND AND DISCUSSION BACKGROUND Visual inspection of snubbers is performed to establish a level of ,

confidence in snubber performance for the next operating cycle. The current inspection period is based upon the number of failures found during the last inspection. This period is windowed to allow sufficient duration such that .

the surveillance has minimal impact on the operation of the plant.

The extended side of the window assures that excessive operating time does not occur between the inspections resulting in a higher probability of failures. The early side of the window serves two purposes: (1) To prevent a licensee from performing several surveillances in a short period which would r allow going to the 18 month interval without the saubbers experiencing any appreciable service lifes (2) To assure that snubbers have gone through sufficient service life for degradation to become observable.

j DISCUSS 10ti Approval of this change would modify LaSalle County Station Technical Specification requirement 4.7.9.b "Subsequent Visual Inspection Period" for sero failures from 18 months (125%) to 18 months (-$0% +25). This would allow  ;

adequate flexibility to bring the snubber surveillance dato back Into conform- l anc? with the refueling outage sequence. This will also prevent a shutdown i for the sole purpose of performing snubber inspections which would have been  ;

required for Unit 1 this cycle.

In June of 1987, snubber visual innpections were performed on LaSalle tinit 1 and no failures were found. The next inspection interval was set at 18 months 125% naking the surveillance due in December of 1988 with an early start

, date (-25%) near the end of July and a critical date (+25%) of April 1989. i j The Unit 1 second refueling outage was started In March 1988 after an 11 month  !

run and ended in the beginning of July 1988. This was short of the early I start date for the visual inspection. The next scheduled outage is October 1989. This could have resulted in a need to shutdown mid-cycle to perform the surveillance. Fortuitously unit startup was delayed and the surveillance was perfomed in late July under the early window. '

l

a

• l The station held discussions with Horace Shaw of the NRC and )

Commonwealth Edison Licensing Department regarding the duration of service '

time between inspections. Regarding the 18 month inspection period, it was felt that nine months was sufficient operating time to sufficiently challenge the snubbers yet still provide the station sufficient flexibility to accomodate short operating cycles. Nine months, while being conservative, is l no shorter time between inspection periods than if two snubber failures had occurred at the last inspection. Based on this discussion, the interval for l the 18 month interval would be specified as +25% or -50%.

I

)

5061K l

,__. . - - - . . - . . _ _ _ _ _ _ - _ . , _ . _ _ _ -.,_,,,r

I ATDCIMENT B l P

4 TECIR(ICAL SPECIFICATICM CHAlfGE REQUEST t

LASALLE (*0tfMTY STATICM UNITS 1 AND 2 PROPOSED __CHARLGZS TO APPENDIX A i

l RE2LEED RAGESs HPF-11 NPF-18 3/4 7-27 3/4 7-28 5061K

. - . _ , ,