ML17262A456

LER 91-004-00:on 910328,emergency Generator B Started Due to Potential for Severe Weather While Operating W/Rcs in Reduced Inventory Condition.Generator Removed from Svc & Realigned for Auto standby.W/910426 Ltr

ML17262A456
Person / Time
Site:	Ginna
Issue date:	04/26/1991
From:	Backus W, Mecredy R ROCHESTER GAS & ELECTRIC CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-91-004, LER-91-4, NUDOCS 9105010167
Download: ML17262A456 (18)

Text

ACCELERATE~ISTBIEUTION DEMOPOTATION SySTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9105010167 DOC.DATE: 91/04/26 NOTARIZED- NO DOCKET FACIL:50-244 Robert Emmet Ginna Nuclear Plant, Unit. 1, Rochester G 05000244 AUTH. NAME AUTHOR AFFILIATION BACKUS,W.H. =

Rochester Gas:& Electric Corp.

MECREDY,R.C. Rochester Gas & Electric Corp.

RECIP.'NAME RECIPIENT AFFILIATION I

SUBJECT:

LER 91-004-00:on 910328,manual start & loading of "B" emerqency diesel generator. Caused by severe weater &

justa.fiable conservatism on part of plant staff.No corrective actions noted.W/910426 ltr.

DISTRXBUTION CODE: IE22T COPIES RECEIVED:LTR f ENCL SIZE:

TITLE: 50.73/50.9 Licensee Event Report (LER),incident Rpt, etc.

NOTES:License Exp date i.n accordance with 10CFR2,2.109(9/19/72). 05000244 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PDl-3 LA 1 1 PD1-3 PD 1 1 JOHNSON,A 1 1 INTERNAL: ACNW 2 2 AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 AEOD/ROAB/DSP 2 2 NRR/DET/ECMB 9H '1 1 NRR/DET/EMEB 7E 1 '

NRR/DLPQ/LHFB11 1 1 NRR/DLPQ/LPEB10 1' NRR/DOEA/OEAB 1 1 NRR/DREP/PRPB11 2 2 NRR/DST/SELB SD 1 1 NRR/DST/SICB 7E 1 1 NRR/DSX/SP~S D1 1. -1 'RR/DST/SRXB SE 1 1 REG~XXiE P ~0 1 1 RES/DSXR/EIB 1 1 RGN1 l.I1R 01 1 1 EXTERNAL EG &G BRYCE I J ~ H 3 3 L ST LOBBY WARD 1 1 NRC PDR 1 1 NSXC MURPHY,G.A 1 1 NSIC POORE,W. 1 1 NUDOCS FULL TXT 1 1 NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE, HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT.,20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 31 ENCL 31

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i Ntv rr 'ttAte ROCHESTER GAS AND ELECTRlC CORPORA7ION ~ 89 EAST AVENUE, ROCHESTER MY. 14649 0001 ROBERT C. MECREDY TELEPHONE Vice Pretrdent AREA CODETt6 546 2700 Cinnrr ttuclesr Production April 26, 1991 U.S. Nuclear Regulatory Commission Document Control Desk

, Washington, DC 20555

Subject:

LER 91-004, Manual Start and Loading of "B" Emergency Diesel Generator, Due To Potential Severe Weather

,Conditions While Operating at Reduced Inventory In The RCS R.E. Ginna Nuclear Power Plant Docket No. 50-244 This event is being voluntarily reported using the guidance of NUREG 1022, and Supplement No. 1 to NUREG 1022. This event is related to, but does not meet, the reporting requirements of 10 CFR 50.73, items -(a) (2} (iii} and (a)(2) (iv) . Item (a) (2)(iii) requires reporting of "any natural phenomenon or other external condition that posed an actual threat to the safety of the nuclear power plant or significantly hampered site personnel in the performance of duties necessary for the safe operation of the nuclear power plant." Item (a)(2)(iv) requires reporting of "any event or condition that resulted in the manual or automatic actuation of any Engineered Safety Feature (ESF), including the Reactor Protection System (RPS). However, actuation of an ESF, including the RPS, that resulted from and was part of the pre-planned sequence during testing or reactor operation need not be reported." The attached Licensee Event .Report LER 91-004 is hereby voluntarily submitted.

This event has in no way affected the public's health and safety.

Ver truly yours, Robert C. Me dy XC: U.S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406 Ginna USNRC Senior Resident Inspector p 9105010167 91042c'n PDR 8

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0 MRC form 555A U 5 IIUCLKAR RTOULATORY COMMITSIOH I943 I I;ICENSEE EVENT REPORT (LERI TEXT CONTINUATION ASSROVEO OMI RO f 3I50&IOI TRSIR55 TITlr55 fACILITYNAM5 III OOCK5T NUMRKR ITI LTR MVM05R I~ I ~ A45 Ol v TAII 554VTrrTIAL v 'TYrOKlrr RVM TR I 'rVM I

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~LUIITI PRE-EVENT PLANT CONDITIONS The. plant was in the cold shutdown condition for the .

Annual Refueling/Maintenance Outage. Reactor Coolant System (RCS) pressure was zero (0) psig and the average of the four (4) connected core exit thermocouples (CETs) was approximately 100 P. The "BLT Residual Heat Removal (RHR) pump was in operation for reactor core decay heat removal.

The plant was being maintained at RCS reduced inventory per operating procedure 0-2.3.1 (Draining and 'peration at Reduced Inventory of the Reactor Coolant System) with RCS Loop Level at approximately 12 inches.

At approximately 0120 EST, March 28, 1991, the Rochester Gas and Electric Corporation (RG6E) Power Control Dispatcher

. notified the Ginna Control Room of adverse weather condi-tions, (i.e. tornadoes and thunderstorms) in Ontario, Canada, approximately 50 miles north of the Ginna Nuclear Power Plant.

At approximately 0130 EST, March 28, 1991, the RG&E Power Control Dispatcher notified the Ginna Control Room of thunderstorms and losses of power in Buffalo, New York, approximately 60 miles west of the plant. They indicated that the storm was moving east at approximately 70 miles per hour.

Discussions were held between the Operations Shift Super-visor and the Outage Coordinator about the weather concerns and the fact the plant was operating with the RCS in a reduced inventory condition. Due to the sensitivity to loss of RHR, it was decided that a prudent action would be to start and load a diesel generator.

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MAC terrrr 55AA U.5. IIUCLfA1 154ULATOAT COMMITSIOM I%431 LICENSEE EVENT REPORT (LER) TEXT CONTINUATION A&AOVCO OM5 rIO 5IM&IOA 5)ltr155 '5/$ 1%5 I'ACILITYMAM5 lll OOCK5T MUM451 151 I. j1 IIUM451 I ~ I PA45 15I N5 4 Mirr T I A L M

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R.E. Ginna Nuclear Power Plant o s o o o 244 91 004 00 0 40' 7 TEXT IIIrrrer rrce r rreerrr. rrar ereoere frrC fere ~ 5 I I ITI METHOD OP DISCOVERY:

The potential event was made apparent by notification from the RGGE Power Control Dispatcher on weather conditions.

OPERATOR ACTION:

The Control Room operators started the "B" Emergency Diesel Generator and tied Bus f17.

it into Safeguards 480 Volt Subsequently, after the storm had passed through the area, the Control Room operators removed the "B" Emergency Diesel Generator from service and realigned it for auto standby.

Higher supervision and the Nuclear Regulatory Com-mission (NRC) were notified of the 'B" Emergency Diesel Generator operation.

G. SAFETY SYSTEM RESPONSES:

The "B" Emergency . Diesel Generator, manually started and tied to safeguards after 480 Volt it was Bus f17, operated as designed.

III CAUSE OR &TENT A.'MMEDIATE CAUSE:

The manual starting and tying into Safeguards 480 Volt Bus f17 of the "B" Emergency Diesel Generator was due to a potential severe weather condition materializing, while the plant was operating with the RCS in a reduced inventory condition.

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R.E. Ginna Nuclear Power Plant IIIIC AWw ~ TI I I TI o 5 o o o 24 491 ,,00 4 00 0 6 oF 0 7 However, due to the sensitivity of the plant being in the RCS reduced inventory condition at the time of the forecast of severe weather, a voluntary LER is deemed appropriate.

An assessment was performed considering both the safety consequences and implications. of this event with the following results and conclusions:

o The "B" Emergency Diesel Generator operated as designed.

o Both offsite power sources were. either in service or available throughout the event.

o Due to the potential for severe weather conditions while the plant was operating with the RCS in the

'educed inventory condition, the decision, to start the "B" Emergency Diesel Generator was justifiable.

Based on the above, it health and safety was assured at all times.

can be concluded that the public's, CORRECTIVE ACTION A ACTXON TAKEN TO XU"HEW AFFECTED SYSTEMS TO PRE-EVENT NORMAL STATUS After the storm had passed'the "B" Emergency Diesel Generator was removed from service and realigned for auto standby.

B. ACTZON TAKEN OR PLANNED TO PREVENT RECURRENCE Since the potential severe weather conditions were a natural phenomenon, no corrective actions to prevent recurrence are warranted.

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