ML20154J473

Forwards Request for Addl Info to Complete Review of LER 269/87-05 Re Potential Tripping of HPI Pump Motors on Overcurrent for Pump Starting During Loca.Info Requested within 45 Days of Date of Ltr

ML20154J473
Person / Time
Site:	Oconee
Issue date:	09/20/1988
From:	Matthews D Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
TAC-68468, TAC-68469, TAC-68470, NUDOCS 8809230036
Download: ML20154J473 (3)

Text

'

n i Septaber 20, 1988 ,

I DISTRIBUTION '

h -

NRC PDR Local PDR t PD23 r/f >

, , Oconee Plant 'ile (

S.Yarga(14E4) i

, Docket Nos. 50 269, 50 270 G. Lainas  ;

and 50-287 D. Matthews  !

! M. Rood i

! H. Pastis i

, Mr. H. B. Tucker Vice President E. Jordan (NNBB3302)  !

! Neclear Production Department B. Grimes  !

Duke Power Company ACRS(10)(9A2) l

, 422 Seuth Church Street  ;

j. Charlotte, North Carolina 20242 j

+

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Dear Mr. Tucker:

i  !

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION . HP! PUMP MOTOR OVERCURRENT '

(TACS68468/68469/68470) j s

Re: Dconee Nuclear Station - Units 1, 2, and 3 l Licensee Event Report, LER 269/87-05 dated February 1,1986, reported a f i situation concerning the potential tripping of the high pressure injection  !

i (HPI) pump motors on overcurrent for pump startup during a loss-of-coolant i j accident or loss of offsite power scenario. You determined that the root j cause of this event was a debien deficiency from an inadequate HPI pump motor i

! cvercurrent relay setting. To complete our review of the event end .

a corrective actions, the additional information identified in the enclosure is l l needed.  ;

! I

Please rsspond to this request for additional information within 45 days of the L

$ date of this letter, j i

l The reporting and/or recordkeeping requirenents contained in this letter i i affect fewer than ten respondents; therefore, OMB clearance is not required i 1 under P.L. 96 511. l I i l Sincerely,  :

I 0009230036 080920 Driginal Udvid B. Sianed By: Director Mattnews, l

, PDR ADOCK 05000269 j

, S PNU Project Directorate !!.3  !

Division of Reactor Projects I/!!  ;

! Enclosure' l Request for Additional  !

Inforination i j cc w/ enclosure:

See next page n i g i L

0FFICIAL RECORD COPY n\i i

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NAME : HRoo :H tis:jlm: DRatthews :  :  :  :  !

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< DATE : 9/f4/88  : 9/2988  : 9/W/88 (

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Mr. H. B. Tucker Oconee Nuclear Station  !

Duke Power Company Units fios. 1, 2 and 3 l

cc:  !

Mr. A. V. Carr, Esq. Mr. Paul Guill }

Duke Power Company Duke Power Compary r P. 0, Box 33189 Post Office Box 33189 i i'

412 Soutn Church Street 422 Soutn Church Street i 1 Charlotte, North Carolina 28242 Charlotte, North Carolina 28242 t J. Michael McGarry. !!!, Esq. l Bishop. Liberman. Cook, Purcell & Reynolds i 1200 Seventeenth Street, N.W. [

Washington, D.C. 20036 j i

Mr. Robert B. Borsum Babcock & Wilcox  !

huclear Power Generation Civision .

Suite 525  !

1700 Reckville Pike Rocks 111e, Maryland 20852  !

o I Manager, LIS I

, NUS Corporation l l 2536 Countryside Boulevard  ;

1 Clearwater, Florida 33515 l

! Senior Resident inspector  !

I U.S. Nuclear Regulatory Comisston  !

l Route 2. Box 610 i

]

Seneca, South Carolica 29678  !

t Regional Administrator, Region !! I U.S. Nuclear Regulatory Commission [

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101 Marietta Street, h.W., Suite 2900  ;

Atlanta, Georgia 30323 j 1

Mr. Heyward G. Shealy, Chiet  !

l Bureau of RadioloCical Health South Carolina Department of Health  !

i and Environmen:ai Ccntrol [

2600 Bull Street

Columbia, Souto Carolina 29201 ,

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j Offfte of Intergover3 mental Relations  ;

116 West Jeres Street i i Rateign, North Carolina 27603 l E

i Honorable James M. Painney [

4 Ccunty Supervisor of Oconee Lounty t Walhella. South Carolina 256El i l i I

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i t

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i REQUEST FOR ADDITIONAL INFOR'iATION HIGH PRESSURE INJECTION PultP MOTOP OVERCURRENT OCNIEE NUCLEAR STATION, UNIT NO. I, 2, AND 3 TAC NOS. 68468, 68469 AND 68470 The staff is currently reviewing Licensee Event Report (LER) 269/87-05 dated February 1,1988, concerning the potential tripping of the high pressure injection (HPI) pump motors on overcurrent for pump startup during a LOCA/ LOOP scenario and has the following questions.

1. LER 269/87-05 states that the original settings for the HPJ pump motor overcurrent relays were below the locked-rotor therrnal change curve as appropriate. The corrective action to prevent the event situation from occurring includes raising the overcurrent relay settings. Do the new settings now exceed the thermal limits of the motors? If not how N ch margin remains? Willthemotors' performance /lifebeadverselyaffected by the higher current and longer duration of the new relay settings?

2. Sir.ce the overcurrent relay settings for the HPI purrp motors have been increased, what effect does tnis have on upstream components (overcurrent relays, breakers, etc.)? Hi.va upstrea:a breaker / relay settings been coordinated with the new overturrent settings?

3. LER 269/87-05 states that the plant's design engineering staff identified by analysis the situation concerning the potential tripping of these

! notors on overcurrent. Provide a discussion of the analysis for these loads and any other loads analyzed including details such as the electrical system response, bus voltage, etc.

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