ML20126F763
| ML20126F763 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 12/21/1992 |
| From: | Jabbour K Office of Nuclear Reactor Regulation |
| To: | NRC |
| References | |
| TAC-M80948, NUDOCS 9212310123 | |
| Download: ML20126F763 (27) | |
Text
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k,*****/ December 21, 1992 Docket Nos. 50-321 and 50-366 l LICENSEE: Georgia Power Company, et al. FAClll1Y: Hatch Nuclear Plant, Units 1 and 2
SUBJECT:
MEETING
SUMMARY
OF NOVEMBER 16, 1992, ON THE DEGRADED GRID VOLTAGE SETPOINTS AT HATCH NUCLEAR PLANT (TAC NO. M80948) Introduction On November 16, 1992, the NRC staff met with Georgia Power Company (GPC or licensee) representatives and their consultants from Southern Company Services (SCS) in Rockville, Maryland. The meeting was held at NRC's request to , discuss the licensee's plan and conclusion regarding the above subject. Enclosure 1 lists the attendees, and Enclosure 2 contains the meeting agenda. Discussion ' In its introduction, the NRC staff noted that this issue resulted from an Electrical Distribution System functional Inspection which was completed on , July 12, 1991. During the inspection, GPC issued an Operating Order which specified certain actions to be performed if the 4160 volt essential busses -l fell below the minimum acceptable voltages. These actions include initiation -i~ of a one hour Limiting Condition of Operation (LCO) to restore safety-related bus voltages, notification of management and NRC, declaration of an unusual- ' event, and an orderly plant shutdown if voltage is not restored. Subsequent-to the inspection, the NRC indicated the Operating Order was adequate as an- , interim measure. 4 Following NRC staff's remarks, Mr. Bethay,.GPC, discussed the degraded grid issues and stated that GPC integrated the requirements for the existing electrical design with plant and system operations. He further stated that the methods currently in place provide a higher level of safety when compared , to automatic controls. His statement was based on the reliability of the Southern Electric System, The Southern Company's control and procedures, and the low probability of the event. He also added that an orderly, fast shutdown is preferable to an automatic reactor scram. Thus, GPC concluded that-further enhancements are not needed and are not ccst beneficial. Enclosure 3 contains a copy of the viewgraphs used for his presentation. 4 Mr. Miller, SCS, discussed the makeup of the Southern Electric System and Hatch's. impact on it.; He stated that their Operation Centers provide-continuous monitoring and contingency analysis, and enumerated the actions that will be taken if-the 230 KV system fell below 101.3%. Enclosure 4-contains a-copy of the viewgraphs used for his presentation. 28002. rg - 3-
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i December 21, 1992 Mr. Anderson, SCS, discussed the conceptual modifications and their approximate costs. Enclosure 5 contains a copy of the vicwgraphs used for his i presentation. ' Mr. Heidt, GPC, provided the licensee's summary and requested 14RC approval of 1 an administrative implementation of NRC's Branch Technical Position (BlP) PSB-1. He reiterated that GPC's solution integrates the requirements for the existing electrical design with plant and system operations, He also reiterated GPC's position that the methods in place provide an adequate level of safety, and in some scenarios, a higher level of safety when compared to automatic controls. Therefore, GPC concluded that further enhancements are l not cost beneficial. Enclosure 6 contains a copy of the viewgraph used for his presentation. CDat19 don The NRC staff stated that it will review the information provided during the meeting, and, in the near future, will transmit to the licensee its position regarding the issue of degraded grid voltage at Hatch. Original signed by: Kahtan N. Jabbour, Project Manager Project Directorate 11-3 Division of Reactor Projects - 1/11 Office of Nuclear Reactor Regulation
Enclosures:
- 1. List of Attendees
- 2. Meeting Agenda
- 3. - 6. Viewgraphs Used for Presentations cc w/ enclosures: DlSIRIBUHDM See next page SEE NEXT PAG
*SEE, PREVIOUS CONCURRENCE PDil%A PDil-3:PM - BC:SELB* -
'j f'h3 Uk W[5 LBeFr KJabbour:cw CBerlinger tthews
/M Gly/92 l'L/18/92 12/09/92 / /92 DOCUMENT NAME: G:\ HATCH \NOV16MTS l
December 21, 1992 Mr. Anderson, SCS, discussed the conceptual modifications and their approximate costs. Cnclosure 5 contains a copy of the viewgraphs used for his presentation. Mr. Heidt, GPL, provided the licensee's summary and requested f4RC approval of an administrative implementation of 11RC's Branch Technical Position (B1P) PSB-1. lie reiterated that GPC's solution integrates the requirements for the existing electrical dtsign with plant and system operations. lie also reiterated GPC's position that the methods in place provide an adequate level of safety, and in some scenarios, a higher level of safety when compared to automatic controls. Therefore, GPC concluded that further enhancements are not cost beneficial. Enclosure 6 contains a copy of the viewgraph used for his presentation. Off1tlRsiori The NRC staff stated that it will review the information provided during thn meeting, and, in the near future, will transmit to the licensee its position regarding the issue of degraded grid voltage at Hatch. lDjIL J J?tlhow
- Kahtan li. Jabbour, Project Manager Project Directorate 11-3 Division of Reactor Projects - 1/11 Office of fluclear Reactor Regulation
Enclosures:
- 1. List of Attendees _
- 2. Meeting Agenda
- 3. - 6. Viewgraphs Used for Presentations cc w/ enclosures:
See next page
t Mr. W. G. Hairston, !!! Georgia Power Company Edwin 1. Hatch Nuclear Plant l Cc: Mr. Ernest L. Blake, Jr. Mr. R. P. Mcdonald . Shaw, Pittman, Potts and T*owbridge Executive Vice President - i 2300 N Street, NW. 'b c, lear Operations - Washington, DC 20037 Georgia Power Company P. O._ Box 1295 Mr. J. T. Beckham Birmingham, Alabama 35201 Vice President - Plant Hatch Georgia Power Company Mr. Alan R. Herdt, Chief ' P. O. Box 1295 Project Branch #3 Birmingham, Alabama 35201 U. S. Nuclear Regulatory Commission 101 Marietta Street, NW, Suite 2900 , Mr. S. J. Bethay Atlanta, Georgia 30323 , Manager Licensing - Hatch Georgia Power Company Mr. Dan Smith P. O. Box 1295 Power Supply Operations ' Birmingham, Alabama 35201 Oglethorpe Power Corporation
- 2100 East Exchange Place Mr. L. Sumner Tucker, Georgia 30085-1349 .
General Manager, Nuclear Plant : Georgia Power Company Charles A. Patrizia. Esquire Route 1, Box 439 Paul,-Hastings Janofsky & Walker . Baxley, Georgia 31513 12th Floor . 1050 Connecticut Avenue, NW. Resident Inspector Washington, DC 20036 U. S. Nuc1 car Regulatory Commission Route 1 Box 725 Baxley, Georgia 31513 Regional Administrator, Region 11-U. S. Nuclear Regulatory Commission - 4 101 Marietta Street, NW. Suite 2900 Atlanta, Georgia 30323 Mr. Charles H. Badger ~ Office of Planning and Budget Room 610 270 Washington Street, SW.
. Atlanta, Georgia 30334 Harold Reheis,-Otrector- -
Department of Natural Resources 205 Butler Street,iSE.. Suite 1252 Atlanta, Georgia 30334 Chairman Appling County Commissioners County Courthouse Baxley, Georgia 31513
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December 21, 1992 M5181hU11%L ,,
; Docket File '
NRC & Local PDRs PDil-3 R/F Hatch R/F T. Hurley/F, Hiraglia,12G18 J. Partlow, 12G18 S. Varga G. Lainas ,
-0. Hatthews K. Jabbour L. Berry -
OGC, 15818 ; E. Jordan, MNBB3701 ACRS (10), P-315 L. Plisco, 17G21 E. Herschoff, Ri! C. Berlinger, E. Weiss, MNBB3206 H. Trehan, 7E4 J. Lazevnick, 7E4 C. Morris, 7E4 E. Imbro, 9Al i D. Norkin, 9Al t h I o t'
ENCLOSURE 1 Myl@[R 16.1992 BC]GPC Meetina List of Attendees f1RC GPC/51S__ D. Matthews J. Heidt K. Jabbour S. Bethay C. Berlinger M. Miller E. Weiss 1. Anderson N. Trehan J. Branum J. Lazevnick G. McGaha C. Morris T. Sims E. Imbro (part-time) R. liayes D. Norkin (part-time) B. Snider
', ENCLOSURE 2 GEORGIA POWER COMPANY PLANT E. I. H ATCH DEGRADED GRID ISSUES NOVEMBER 16,1992
- 1. INTRODUCTION S. J. BETII AY II. BACKGROUND AND S. J. BETHAY CU~RRENT STATUS III. OFFSITE POWER SYSTEM M.B. MILLER IV. OPTIONS CONSIDERED T. O. ANDERSON V.
SUMMARY
J. D. HEIDT VI. OPEN DISCUSSION
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.- ENCLOSURE-- 3 GEORGIA POWER COMPANY PLANT E. I. HATCHL DEGRADED GRID ISSUES NOVEMBER 16,1992
SUMMARY
I. GPC'S SOLUTION INTEGRATES THE REQUIREMENTS FOR ELECTRICAL DESIGN, PLANT OPERATIONS AND SYSTEM OPERATIONS.
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II. THE METHODS IN PLACE PROVIDE AN ADEQUATE LEVEL OF SAFETY, AND IN SOME SCENARIOS, A. IllGHER LEVEL OF SAFETY WIIEN COMPARED TO AUTOMATIC CONTROLS.
- RELIABILITY OF THE SOUTHERN ELECTRIC SYSTEM
=- SOUTHERN COMPANY SYSTEM CONTROL POLICIES AND PROCEDURES
= 10-8 PROBABILITY OF DEGRADED VOLTAGE '
CONDITIONS (<101.3%)
- AN ORDERLY, FAST SHUTDOWN IS P. REFERABLE' TO-AN AUTOMATIC OR SELF INDUCED REACTOR ISOLATION TRANSIENT
= ADVERSE SYSTEM IMPACT FROM AUTOMATIC' DISCONNECT e' FURTHER ENHANCEMENTS ARE NOT COST BENEFICIAL I Nb' WI'I
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GEORGIA POWER COMPANY PLANT E. I. HATCH DEGRADED GRID ISSUES NOVEMBER 16,1992 ISSUE SUMM ARY ; I. DURING SUSTAINED DEGRADED GRID CONDITIONS ! AT OR SLIGIITisY ABOVE THE CURRENT SETPOINT, THE UNDERVOLTAGE PROTECTION WAS NOT CONSIDERED ADEQUATE TO ENSURE SAFETY-RELATED EQUIPMENT AT 600 VOLTS AND BELOW WOULD BE SUPPLIED WITH ADEQUATE VOLTAGE.
- LOCA ACCIDENT CONDITIONS CONCURRENT WITH A DEGRADED -GRID.
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GEORGIAL POWER COMPANY PLANT E. I. HATCH: DEGRADED GRID ISSUES NOVEM.BER 16,.1992 . GPC OBJECTIVES
- 1. ENSURE THE PLANT IS ADEQUATELY PROTECTED FROM UNDERVOLTAGE CONDITIONS.
- ASSESS THE LEVEL OF SAFETY PROVIDED BY THE-CURRENT SYSTEM -
- IDENTIFY AVAILABLE OPTIONS
= DETERMINE IF IMPROVEMENTS ARE FEASIBLE II. ENSURE OFFSITE POWER IS PRESERVED AS THE' PREFERRED SOURCE.
III. DEVELOP AN INTEGRATED APPROACH CONSIDERING-- THE ELECTRICAL DESIGN REQUIREMENTS, SYSTEM-- OPERATION AND PLANT OPERATION. IV. AN UNDERVOLTAGE RELAY SETPOINT WITHIN:THE NORMAL SYSTEM OPERATING RA'NGE IS UNACCEPTABLE. YY T 4' Y- M -
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GEORGIA POWER COMPANY: PLANT E. I. HATCH DEGRADED GRID ISSUES NOVEMBER 16,1992
.GPC OBJECTIVESTCONTINUED)
V. AN ORDERLY, FAST REACTOR SHUTDOWN IS PREFERABLE TO AN AUTOMATIC ISOLATION OR SELF-INDUCED REACTOR ISOLATION TRANSIENT WITHOUT OFFSITE POWER.
- SYSTEM OPERATORS SHOULD BE-ALLOWED TO QUICKLY MITIGATE A DEGRADED GRID TRANSIENT TO AVOID AN UNNECESSARY.-
ISOLATION TRANSIENT AND'A FURTHER CHALLENGE.TO GRID STABILITY.
- SYSTEM OPERATIONS SHOULD ASSESS THE CHALLENGE TO THE GRID AND DETERMINE IF QUALITY.OFFSITE POWER CAN BE MAINTAINED.
-VI. ENSURE RESOLUTION DOES NOT RESULT IN -AN ACTUAL DECREASE IN OVERALL SAFETY.
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GEORGIA POWER COMPANY PLANT E. I. HATCH DEGRADED GRID ISSUES NOVEMBER 16,1992 CRITERIA
- 1. RISKS ASSOCIATED WITH AN AUTOMATIC SilUTDOWN MUST BE BALANCED WITH THE RISKS ASSOCIATED WITil CONTINUED OPERATION.
II. RISKS ARE ASSIGNED AS A FUNCTION OF: e THE RELIABILITY OF THE SOUTHERN ELECTRIC SYSTEM'S GRID VS. RELIABILITY OF ONSITE POWER e THE SOUTHERN ELECTRIC SYSTEM'S GRID MONITORING AND SINGLE FAILURE ANALYSIS CAPABILITIES VS. SETPOINT CONTROLS e THE EXTREMELY LOW PROBABILITY OF DEGRADED VOLTAGE AT PLANT HATCII VS. THE POSSIBILITY OF SPURIOUS REACTOR ISOLATION TRANSIENTS ON THE PLANT
= THE PROBABILITY OF OFFSITE VOLTAGE FALLING BELOW 101.3% IS 4.3X10-8
= THE ANTICIPATED DURATION OF A DEGRADED GRID CONDITION
- THE POTENTIAL EFFECT OF BRIEF DEGRADED VOLTAGE ON PLANT . EQUIPMENT VS. THE EFFECT FROM AN ISOLATION TRANSIENT WITH 3 BUSSES AVAILABLE ON ONE UNIT' AND 2 BUSSES ON THE OTHER
= THE SYSTEM IMPACT OF SEPARATING 1600MW FROM A DEGRADED GRID
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c . l' GEORGIA POWER COMPANY PLANT E. L HATCH DEGRADED GRID ISSUES NOVEMBER 16,1992 ACTIONS COMPLETED
- 1. IIARDWARE AND SETPOINT CIIANGES IIAVE BEEN INVESTIGATED.
II. WORKED WITH SYSTEM OPERATIONS TO GAIN AN UNDERSTANDING OF:
- TIIE GRID MONITORING AND SINGLE FAILURE ANALYSIS CAPABILITIES
= SYSTEM OPERATING PROCEDURES THAT ENSURE ADEQUATE VOLTAGE IS MAINTAINED e TIIE SYSTEM CONDITIONS WillCII WOULD llAVE TO OCCUR TO PRODUCE DEGRADED VOLTAGE AT PLANT HATCII Ill. INSTALL ANTICIPATORY ALARMS.
IV. FORMALIZED ANTICIPATORY ACTION - BOTH ONSITE AND OFFSITE. V. FORMALIZED COMMUNICATIONS WITH SYSTEM OPERATIONS. VI. IMPLEMENTED AN OPERATING ORDER TO ENSURE THE REACTOR IS QUICKLY BROUGHT TO A CONDITION OF GREATER SAFETY.
- PROVIDES ACTIONS CONSISTENT WITH TECHNICAL SPECIFICATIONS ACTIONS FOR FAILURE OF ALL DIESEL GENERATORS
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T GEORGIA POWER COMPANY PLANT E. I. HATCH DEGRADED GRID ISSUES NOVEMBER 16,1992 IF 230KV SYSTEM FAILS BELOW 101.3%
- RECEIVE LOW VOLTAGE ALARM
+ NOTIFY CONTROL ROOM AT PLANT HATCH + PUT CAPACITOR BANKS ON
- TURN SHUNT REACTORS OFF e
PUT COMBUSTION TURBINES -(McMANUS ) IN SERVICE
= BRING OUT OF SERVICE ELEMENTS BACK TO SERVICE e REDUCE ' LOAD
ENCLOSURE 5 } GEORGIA POWER COMPANY PLANT E. I. H ATCH DEGRADED GRID ISSUES NOVEMBER.16,1992 CONCEPTUAL MODIFICATIONS APPROXIM ATE COST I. TAP CIIANGES $ 250,000 II. NEW RELAYS, CABLE $ 500,000 - $1 MILLION AND / OR EQUIPMENT CIIANGE OUT III. NEW LOAD SHED / BUS $ 1 - 2 MILLION TRANSFER SCIIEMES IV. RE ANALYSIS OF EXISTING $ 1 - 2 MILLION - LOAD AT LOWER VOLTAGE V. NEW MAJOR EQUIPMENT $ 10 MILLION l
i
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; I 290KV 4.I6KV I04.9 96.7 EXP I09.5 99@,
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%c4 9 2 -; ALARM i 9 I .4 PEQ 91 l*+ EXP -
90.8 REO DEADBAND 88.94 : TRIP 1 4
ENCLOSURE 6 GEORGIA POWER COMPANY PLANT E. I. HATCH DEGRADED GRID ISSUES NOVEMBER 16,1992 SUMSIARY L GPC REQUESTS NRC APPROVAL OF ADSilNISTRATIVE IMPLEMENTATION OF BRANCll TECHNICAL POSITION PSB-1. II. GPC'S SOLUTION INTEGRATES TIIE REQUIREMENTS FOR ELECTRICAL DESIGN, PLANT OPERATIONS AND SYSTEM OPERATIONS. III. THE METHODS IN PLACE PROVIDE AN ADEQUATE LEVEL , OF SAFETY, AND IN SOME SCENARIOS, A HIGHER LEVEL OF SAFETY WHEN COMPARED TO AUTOMATIC CONTROLS.
- RELIABILITY OF THE SOUTHERN ELECTRIC SYSTEM e SOUTHERN COMPANY SYSTEM CONTROL POLICIES AND PROCEDURES
- 10-8 PROBABILITY OF DEGRADED VOLTAGE CONDITIONS
(<101.3%)
- AN ORDERLY, FAST SHUTDOWN IS PREFERABLE TO AN AUTOMATIC OR SELF INDUCED REACTOR ISOLATION TRANSIENT
- ADVERSE SYSTEM IMPACT FROM AUTOMATIC DISCONNECT IV. FURTHER ENHANCEMENTS ARE NOT COST BENEFICIAL
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