ML20034G831

Summary of 930222 Meeting W/Util in Rockville,Md to Discuss Planned Mod to Offsite Power Source at Plant.List of Attendees & Viewgraphs Encl

ML20034G831
Person / Time
Site:	Peach Bottom
Issue date:	03/05/1993
From:	James Shea Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 9303110377
Download: ML20034G831 (9)

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NUCLEAR REGULATORY COMMISSION o,

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WASHINGTON. D.C. 2OliE6

,8 March 5, 1993 Docket Nos. 50-277 and 50-278 LICENSEE:

Philadelphia Electric Company FACILITY:

Peach Bottom Atomic Power Station, Units 2 and 3

SUBJECT:

POWER SYSTEM IMPROVEMENT MODIFICATIONS AT PEACH BOTTOM V

On February 22, 1993, the NRC staff met with Philadelphia Electric Company (PEco) representatives at the NRC Headquarters in Rockville, Maryland, to discuss a planned modification to the offsite power source at Peach Bottom Atomic Power Station, Units 2 and 3.

Enclosed is a list of meeting participants and a copy of the licensee's meeting handout.

The licensee opened the meeting with a discussion of problems with the design of the onsite AC power distribution system at Peach Bottom. The problems were brought into focus by the licensee during a 1988-1989 voltage regulation study of the Peach Bottom station. As a result of that study, PEco took steps to i

compensate for previousl.y unrecognized voltage drops by, among other steps, raising nominal 4kV bus voltage. The compensating actions imposed certain operating restrictions and PEco undertook development of modifications to the onsite distribution system to alleviate the restrictions.

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Currently, non-safety loads are powered from one of the two 13.8 kV startup busses. The startup busses receive power from either the unit auxiliary transformer or one of the two preferred offsite power sources via the #2 or #3 1

startup switchgear. The #3 startup switchgear receives power from the north substation via either the #343 Startup Transformer or the #1 Auto Transformer.

The licensee proposes to install a new 13.8 kV switchgear that will serve as a source for the #1 startup bus.

In addition, some miscellaneous building loads will be removed from the unit auxiliary switchgear and powered directly from the new 13.8 kV switchgear. The new switchgear will be powered from the tertiary of the #1 Auto Transformer via the #3 startup and emergency auxiliary regulating transformer. The new switchgear will have the ability to be tied in as one of the preferred power sources for the safety-related_ busses in either unit. This capability will allow one of the normal preferred power sources to be taken out of service without forcing the units into technical specification operating limitations.

Additional changes that will be installed as part of the modification include installation of fiber optic control cables for some of the north substation circuit breakers. This modification will alleviate problems with spurious tripping of switchyard breakers due to lightning or switchyard-fault induced ground' currents.

In addition, controls for the power source via the #343 transformer and the source through the #1 Auto Transformer will be moved to physically separate locations in the North Substation to achieve appropriate separation.

9303110377 930305

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Joseph W. Shea, Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation

Enclosure:

1.

Meeting Attendees 2.

Licensee Meeting Handout cc w/ enclosures:

Licensee & Service List DISTRIBUTION _ w/ enclosures 1 and 2 Docket File DISTRIBUTION w/ enclosure 1 NRC & Local PDRs TMurley/FMiraglia ACRS(10)

PDI-2 Reading JPartlow VMcCree JShea SVarga EWenzinger, RGN-I JCalvo CAnderson, RGN-I Chiller M0'Brien 0GC EJordan, 3701 CThomas C8erlinger 0FFICE PDI47th/b PDI-2#h EEL 8 PDI-2/D MOdrien JShTkfA)5 CThomasdhi~ CMfilfrN I

NAME DATE h/h/93

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>/'//93 3/[/9 0FFICIAL RECORD COPY DOCUMENT NAME:

P82-22.MTS hymissumads daRM

. l The licensee indicated that a change to the Technical Specification Bases only will be required to support the modification.

The licensee expects to implement the modification no later than the second quarter of 1994.

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Joseph W. Shea, Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation

Enclosure:

eeting Attendees 1.

u 2.

Licensee Meeting Handout cc w/ enclosures:

Licensee & Service List DISTRIBUTION w/ enclosures 1 and 2 DISTRIBUTION w/ enclosure 1 Docket File TMurley/FMiraglia ACRS(10)

NRC & Local PDRs JPartlow VMcCree PDI-2 Reading SVarga JShea JCalvo EWenzinger, RGN-I CMiller CAnderson, RGN-I M0'Brien OGC EJordan, 3701 CThomas CBerlinger 0FFICE PDIQ7tNNA PDI-2/h EELB PDI-2/D MOdriIn JShklA)5 CThomasO/'7~ CM6T[/h I

NAME ll DATE D/kb 93 3/ b93 9/d /93 3/[/93

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0FFICIAL RECORD COPY DOCUMENT NAME:

PB2-22.MTS i

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t The licensee indicated that a change to the Technical Specification Bases only will be required to support the modification. The licensee expects to implement the modification no later than t second quarter f 1994.

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1 sep W. Shea, Project Manager roject Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation

Enclosures:

1.

Meeting Attendees l

2.

Licensee Meeting Handout cc w/ enclosures:

Licensee & Service List l

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Philadelphia Electric Company Peach Bottom Atomic Power Station, Units 2 and 3

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i J. W. Durham, Sr., Esquire Mr. William P. Dornsife, Director

'i Sr. V.P. & General Counsel Bureau of Radiation Protection 1

Philadelphia Electric Company Pennsylvania Department of 2301 Market Street, S26-1 Environmental Resources Philadelphia, Pennsylvania 19101 P. O. Box 2063 Harrisburg, Pennsylvania 17120 Philadelphia Electric Company ATTN: Mr. D. B. Miller, Vice President Board of Supervisors i

Peach Bottom Atomic Power Station Peach Bottom Township Route 1, Box 208 R. D. #1 Delta, Pennsylvania 17314 Delta, Pennsylvania 17314 Philadelphia Electric Company Public Service Commission of Maryland ATTN:

Regulatory Engineer, Al-2S Engineering Division Peach Bottom Atomic Power Station ATTN: Chief Engineer Route 1, Box 208 231 E. Baltimore Street Delta, Pennsylvania 17314 Baltimore, MD 21202-3486 Resident Inspector Mr. Richard McLean i

U.S. Nuclear Regulatory Commission Power Plant and Environmental l

Peach Bottom Atomic Power Station Review Division P.O. Box 399 Department of Natural Resources Delta, _ Pennsylvania 17314 B-3, Tawes States Office Building Annapolis, Maryland 21401 Regional Administrator, Region I U.S. Nuclear Regulatory Commission Mr. George J. Beck 475 Allendale Road Manager-Licensing, MC 52A-5 King of Prussia, Pennsylvania 19406 Philadelphia Electric Company Nuclear Group Headquarters Mr. Roland Fletcher Correspondence Control Desk Department of Environment P.O. Box No. 195 i

201 West Preston Street Wayne, Pennsylvania 19087-0195 Baltimore, Maryland 21201 i

Carl D. Schaefer External Operations - Nuclear Delmarva Power & Light Company i

P.O. Box 231 Wilmington, DE 19899 1

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ENCLOSURE 1 LIST OF ATTENDEES MEETING BETWEEN PHILADELPHIA ELECTRIC COMPANY AND THE NRC February 22, 1993 MAME ORGANIZATION C. Thomas NRC/EELB J. Shea NRC/DRPE l

M. Kray PEco l

W. Mindick PEco D. Torone PEco l

C. Brown PEco W. Culp PEco/SWEC l

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t ENewscar 2 PEACH BOTTOM THIRD OFFSITE SOURCE AGENDA

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INTRODUCTIONS TECHNICAL SPECIFICATIONS - MARILYN KRAY EXISTING DESIGN BILL MINDICK MODIFICATION OBJECTIVES DAVID TORONE

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NEW DESIGN -

DAVID TORONE j

STATUS DAVID TORONE QUESTIONS AND ANSWERS l

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V PEACH BOTTOM OFFSITE & ONSITE POWER SYSTEMS UNIT OUTPUT TO 500kV SYSTEMS UNIT 2 TO SOUTH 500kV SUBSTATION KEENEY - 5014 CONASTONE - 5012 TWO TIES TO NORTH SUBSTATION UNIT 3 TO NORTH 500kV SUBSTATION LIMERICK - 5010 THREE MILE ISLAND - 5007 TWO TIES TO SOUTH SUBSTATION AUTO-TRANSFORMER TIE TO 220kV SUBSTATION MUDDY RUN - 220-07,08 NEWLINVILLE - 220-34 OFFSITE POWER SOURCES GR ACETON-NOTTINGHAM - 220-08

1. 2 STARTUP AND EMERGENCY AUX TRANSFORMER

1. 2 EMERGENCY AUXILIARY TRANSFORMER 220kV SUBSTATION

1. 3 STARTUP AND EA REGULATING TRANSFORMER OR

1. 343 STARTUP TRANSFORMER

1. 3 EMERGENCY AUXILIARY TRANSFORMER 13kV UNIT AUXILIARY BUSES - TWO PER UNIT FED FROM UNIT AUX TRANSFORMERS AT POWER FAST (LIVE BUS) TRANSFER ON GENERATOR TRIP 4kV EMERGENCY BUSES - FOUR PER UNIT TWO PER UNIT FED FROM EACH STARTUP SOURCE TRANSFER (DEAD BUS) TG OTHER ON LOSS OF SOURCE FOUR EMERGENCY DIESEL GENERATORS EACH DIESEL SUPPLIES ONE 4kV BUS IN EACH UNIT

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PEACH BOTTOM MODIFICATION OBJECTIVES i

PROVIDE AN ALTERNATE OFFSITE SOURCE THAT MEETS ALL EXISTING CRITERIA IMPROVE VOLTAGE REGULATION PROVIDE A SOURCE (ALTERNATE) FOR NON-ESSENTIAL LOADS REDUCE NON-ESSENTIAL LOADS ON THE j

GDC-17 SOURCES PROVIDE CAPABILITY FOR LOAD GROWTH i

IMPROVE OPERATING / MAINTENANCE FLEXIBILITY REDUCE OPERATING RESTRICTIONS l

l lMPROVE OFFSITE SOURCE AVAILABILITY REDUCE TIME IN OFFSITE SOURCE L.C.O.

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i PEACH BOTTOM DESIGN OBJECTIVES i

REDUCE OPERATING VOLTAGES FROM 3SU RAISE VOLTAGE UNDER ACCIDENT CONDITIONS l

MEET GDC17 EACH SOURCE (3) HAS CAPABILITY AND CAPACITY TO SUPPLY ACCIDENT LOADS AND SUPPORT A SAFE SHUTDOWN OF THE OTHER UNIT TWO SOURCES AT A TIME DESIGNATED AS GDC-17 SOURCES MEETS PHYSICAL SEPARATION REQUIREMENTS TRANSMISSION LINES l

CONTROL POWER AND CABLES l

l FIBER-OPTIC LINK FOR CONTROL AND RELAYING l

l SEPARATE DC CONTROL POWER SOURCES I

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