ML16341F187
| ML16341F187 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 05/24/1989 |
| From: | Rood H Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TAC-73109, TAC-73110, NUDOCS 8906050169 | |
| Download: ML16341F187 (62) | |
Text
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May 24, 1989 DOCKET NOS.:
50-275 and 50-323 LICENSEE:
FACILITY:
SUBJECT:
PACIFIC GAS AND ELECTRIC COMPANY (PGImtE)
DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1
AND 2 4
SUMMARY
OF MAY 23, 1989 PUBLIC MEETING TO DISCUSS PROPOSED CHANGE IN ALLOWED OUTAGE TIME FOR A DIESEL GENERATOR FROM 72 HOURS TO 7 DAYS (LAR 89-05$
TAC NOS.
73109 AND 73110)
On May 23, 1989 the NRC staff and its consultants met with PGtmE in Rockville, Maryland to discuss proposed License Amendment Request (LAR) 89-05, which would increase the allowed outage time (AOT) for any diesel generator from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 7 days.
This LAR was submitted by letter dated May 12, 1989.
A report documenting the licensee's studies evaluating the'isk and reliability of the revised AOT were submitted by letter dated May 11', 1989.
In these submittals, the licensee stated that it plans to upgrade the onsite AC power system by adding a sixth diesel generator.
This change would be made at'he fourth refueling outage for Unit 2, which is scheduled to begin in October of 1991.
Attendees at the meeting are given in Enclosure 1.
The viewgraphs presented by the licensee during the meeting are given in Enclosure 2.
At the conclusion of the meeting, the NRC staff stated that its review of the LAR was underway, and that if it needed additional information as part of its review, a request for such information would be transmitted to the licensee as soon as the, need is established.
Enclosures:
1.
Meeting Attendees 2.
Viewgraphs Presented by Licensee cc: w/enclosures - see next page DISTRIBUTION original signed by Harry Rood, Senior Project Manager Project Directorate V
Division of Reactor Projects - III, IV, V and Special Projects entra s
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 May 24, 1989 DOCKET NOS.:
50-275 and 50-323 LICENSEE:
1
'FACILITY:
SUBJECT:
PACIFIC GAS AND ELECTRIC COMPANY (PGSE)
DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND,2
SUMMARY
OF MAY 23, 1989 PUBLIC MEETING TO DISCUSS PROPOSED CHANGE IN ALLOWED OUTAGE TIME FOR A DIESEL GENERATOR FROM 72 HOURS TO 7 DAYS (LAR 89-05, TAC NOS.
73109 AND 73110)
On May 23, 1989 the NRC staff and its consultants met with PG&E in Rockville, Maryland to discuss proposed License Amendment Request (LAR) 89-05, which would increase the allowed outage time (AOT) for any diesel generator from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 7 days.
This LAR was submitted by letter dated May 12, 1989.
A report documenting the licensee's studies evaluating the risk and reliability of the revised AOT were submitted by letter dated May ll, 1989.
In these submittals, the licensee stated that it plans to upgrade the onsite AC power system by adding a sixth diesel generator.
This change would be made at the fourth refueling outage for Unit 2, which is scheduled to begin in October of 1991.
Attendees at the meeting are given in Enclosure 1.
The viewgraphs presented by the licensee during the meeting are given in Enclosure 2.
At the conclusion of the meeting, the NRC staff stated that its review of the LAR was underway, and that if it needed additional information as part of its review, a request for such information would be transmitted to the licensee as soon as the need is established.
Enclosures:
1.
Meeting Attendees 2.
Viewgraphs Presented by Licensee cc: w/enclosures
- see next page Harry Rood, Senior Project Manager Project Directorate V
Division of Reactor Projects - III, IV, V and Special Projects
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Mr. J.
D. Shiffer Pacific Gas and Electric Company Diablo Canyon CC:
Richard F. Locke, Esq.
Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, California 94120 Janice E. Kerr, Esq.
California Public Utilities Commission 350 McAllister Street San Francisco, Cali for nia 94102 Ms. Sandra A. Silver 660 Granite CreekRoad Santa Cruz, California 95065 Mr. W. C. Gangloff Westinghouse Electric Corporation P. 0.
Box 355 Pittsburg, Pennsylvania 15230 Managing Editor San.Luis. Obis o-Count.Tele ram r) une 137K i~o nson Avenue P. 0.
Box 112 San Luis Obispo, California 93406 Mr. Leland H. Gustafson, Manager Federal Relations Pacific Gas and Electric Company 1726 M Street, N.
W.
Washington, DC 20036-4502 Dian H. Grueneich Marcia Preston Law Office of Dian M. Grueneich 380 Hayes Street, Suite 4
San Francisco, California 94102 NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach, California 93424 Hr. Dick Bla kenburg Editor
& Co-Publisher South County Publishing Company P. 0.
Box 460 Arroyo Grande, California 93420 Bruce Norton;- Esq.
c/o Richard F. Locke, Esq.
Pacific Gas and Electric Company Post Office Box 7442 San Francisco, California 94120 Dr.
R.
B. Ferguson Sierra Club
-" Santa Lucia Chapter Rocky Canyon Star Route Creston, California 93432 Chairman
'an Luis Obispo County Board of Supervisors Room 270 County Government Center San Luis Obispo, California 93408 Director Energy Facilities Siting Division Energy Resources Conservation and Development Commission 1516 9th Street Sacramento, California 95814 Ms. Jacquelyn Wheeler 3033 Barranca Court San Luis Obispo, California 93401
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Mr. J.
D. Shiff'er Pacific Gas and Electric Company Diablo Canyon CC:
Ms. Laurie McDermott, Coordinator Consumers Organized for Defense of Environmental Safety
.731 Pacific Street, Suite 42 San Luis Obispo, California 93401 Mr. Paul Sza 1 ins ki, Chief Radiological Health Branch State Department of Health Services 714 P Street, Office Building 88 Sacramento, Ca 1 ifornia 95814 Regional Administrator, Region V
U.S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Ms.
Nancy Cul'ver 192 Luneta Street San Luis Obispo, California 93401 President Califo'rnia Public Utilities Commission California State Building 350 McAllister Street
'an Francisco,,California 94102
>f Michael M. Strumwasser, Esq.
Special Assistant Attorney General State of California Department of Justice 3580 Wilshire Boulevard, Room 800 Los Angeles, California 90010
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ENCLOSURE 1
ATTENDEES Public Meeting on License Amendment Requests LAR 89-05 Diesel Generator Allowed Outage Time Diablo Canyon Combined Technical Specifications
- Tuesday, May 23, 1989
~ NAME----
Ni lesh Chokshi Kent Daschke Adel El-Bassioni Robert G. Fitzpatrick Cynthia L. Haag Roger Johnson Jim Knight John Knox Barkeley S.
Lew John McInerney Dick Robinson Harry Rood Raymond Thierry Ken Yavrek George Wu ORGANIZATION NRC/RES/PRAB Westinghouse-NATO NRC/DREP/PRAB BNL (Consultant to NRC)
Westinghouse-NATD PGSE NRC/DEST/SELB NRC/DEST/SELB PG&E Westinghouse-NATO NRC/RES NRC/DRSP/PDV PGSE Westinghouse PGSE
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EN URE 2
DIABLOCANYON POWER PLANT DIESEL GENERATOR ALLOWEDOUTAGE TIME STUDY IVIay 1989 PACIFIC GAS AND ELECTRIC COIVIPANY Q0070:10l051089 Paclflc Gas and Electric Company
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DIESEL GENERATOR LAR MEETING PROPOSED AGENDA MAY 23, 1989 l.
OPENING STATEMENT 2.
OVERVIEW OF LAR AND REPORT 3.
SYSTEM DESCRIPTION 4.
PRA CALCULATIONS SEQUENCES RESULTS 5.
RELIABILITYANALYSIS OVERVIEW CASE MODEI S RESULTS 6.
SUMMARY
NRC PG&E PG&E PG&E WESTINGHOUSE PG&E Pacltlc Oae and Electric Company
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SCHEDULE OVERVIEW NRC MEETING MARCH 31, 1989 REPORT SUBMITTAL MAY 11, 1989 LAR SUBMITTAL MAY 12, 1989 NRC APPROVAL MID-SEPTEMBER 1989 SIXTH DG INSTALLATION FALL 1991 paclllc 0aa and Electric Company
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DIABLOCANYON POWER PLANT DIESEL GENERATOR ALLOWEDOUTAGE TIMESTUDY TABLE OF CONTENTS 1.0
SUMMARY
2.0 INTRODUCTION
2.1 BACKGROUND
2.2 SCOPE OF ANALYSIS 3.0 8.o ELECTRIC POWER SYSTEM 3.1 ELECTRIC POWER SYSTEM FUNCTION 3.2 ELECTRIC POWER SYSTEM DESCRIPTION 3.3 ELECTRIC POWER SYSTEM OPERATION 3.4 DIESEL GENERATORS 3.5
SUMMARY
OF STATION BLACKOUT PROBABILISTICRISK ANALYSIS 4.1 PRA CALCULATIONS 4.2 DATAANALYSIS 4.3 DCPRA ELECTRIC POWER SYSTEM MODEL 4.3.1 CALCULATIONMODIFICATIONS 4.4 CORE, DAMAGESEQUENCE MODELS 4.4.1 DOMINANTSEQUENCE PRA MODEL 4.4.2 NON-SEISMIC SEQUENCES 4.4.3 SEISMIC SEQUENCES 4.5 QUANTIFICATIONOF CORE DAMAGEFREQUENCY 4.5.1 ABSOLUTE RISK RESULTS 4.5.2 RELATIVERISK RESULTS 4.5.3 SENSITIVITYTO SWING DIESEL IN MAINTENANCE 4.6 INTERPRETATION OF RESULTS 5.0 RELIABILITYANALYSIS 5.1 DIESEL GENERATOR FAULTTREE 5.1.1 SUCCESS CRITERIA
'5.1.2 ASSUMPTIONS AND BOUNDARYCONDITIONS 5.1.3 FAULTTREE DEVELOPMENT 5.1.4 QUANTIFICATION Q0070: t D/051089 pacific Gas and Electric Company
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TABLEOF CONTENTS (Cont.)
5.2 CALCULATIONMODELS 5.2.1 SUCCESS CRITERIA 5.2.2 CALCULATIONMODELCRITERIA 5.2.3 CALCULATIONS 5.3 ALLOWEDOUTAGE TIMEANALYSIS 5.4 RELIABILITYANALYSISRESULTS 5A.1 RELATIVERISK METHOD 5.4.2 AVERAGEANNUALRISK METHOD 5.4.3 RISK RESULTS 5.5 SENSITIVITYSTUDY 6.0 7.0 8.0
SUMMARY
OF RESULTS CONCLUSIONS REFERENCES APPENDIXA:
DIESEL GENERATOR SYSTEM EQUATIONS APPENDIX B:
REDUCED CORE DAMAGESEQUENCE MODEL APPENDIX C:
SEISMIC SEQUENCE ANALYSIS APPENDIX D:
RELIABILITYANALYSISFAULTTREES Q0070: 10/05 1 089 Pacltlc Gas snd Electric Company
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SUMMARY
OF ANALYSES USED TWO PROBABILISTIC EVALUATION METHODS PRA BASED UPON LTSP DCPRA (PG&E/PLG)
RELIABILITYANALYSIS BASED UPON BRUNSWICK/BNL METHODS (PG&E/WESTINGHOUSE)
ANALYZED THREE CASES FIVE DGS, 72-HOUR AOT, AND SINGLE 10 DAY PLANNED MAINTENANCE EACH CYCLE (BASE CASE)
FIVE DGS, 7-DAY AOT, AND SINGLE 7 DAY PLANNED MAINTENANCE EACH CYCLE (CASE 2)
SIX DGS, 7-DAY AOT, AND NO PLANNED MAINTENANCE (CASE 3)
DETERMINED CHANGES IN ABSOLUTE AND RELATIVE RISK VALUES (CORE MELT FREQUENCY PER YEAR).
FOUND THAT RELATIVE RISK CRITERION CONFIRMS THE ACCEPTABILITY OF A 7-DAY AOT.
THERE WAS A NEGLIGIBLE CHANGE IN RISK WITH A 7-DAY AOT.
ADDING A SIXTH DG WILL HAVE A POSITIVE BENEFIT, LARGER THAN THE EFFECT OF CHANGING TO A 7-DAY AOT.
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SYSTEM DESCRIPTION ELECTRIC POWER FIVE DIESEL CONFIGURATION SIX DIESEL CONFIGURATION TECHNICAL SPECIFICATIONS Pacltlc Oaa and Electric Company
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stnvaY 500 KY SllITCHYARD 230 KY SlllTCHYARD SIN TNw5$'oeca INIT I TAAICflRKR II TSANIIONCS CI SENT ININ TRAN5toSaa WII C WIILIACT TSANIFOAES lt lOIW MRI1H f
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'IICTCL COCAAITN IC 5 ICCCL COCSATM IS SlcnL coasAnn CI SICIO. COCSATtà CC FIGURE 3-1 DIABLOCANYON ELECTRIC POWER SYSTEM Paclftc aaa and Efecflfc Company 3-)7
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EXISTING DIESEL GENERATOR ARRANGEMENT 500KV GUS TO tSOKV BUS TO TO
~V 560KV, BUS BUS em bUS H UNIT 1
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- 05ESEL, GENERATOR NO. 22
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PROPOSED MODIFICATION ADDITIONOF SIXTH DIESEL GENERATOR TO 500KV 808 TO 230KV BUS TO TO 2SOKV 6OOKV BU8 BUS 4KV SUS H UNIT 1 4KV 4 KV BUS F BUS F UNIT 0 UNIT 2
.4KV BUS O
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4KV BUS O UNIT 2 4KV SUS H UNIT 2 DIESB.
CENERAT<%
NO. a DIESEl DIESEI.
DIESEI.
DIESEI.
OENERATOR OENERATOR OENERATOR OENERATOA NO. f2 NO. 1S NO. 2-S NO. 21 DIESEI.
OENERATOR NO. 22
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MXTH A DXESEL GENERATOR OF THE ABOVE REQUIRED A. C.
ELECTRICAL POWER SOURCES INOP ERABLEi DEMONSTRATE THE OPERABILITY OF 'THE A.C.
OFFSXTE SOURCES BY PERFORMXNG SPECIFXCATXON 4.8.1.1.1A WITHIN 1 HOUR AND AT LEAST ONCE PER 8 HOURS THEREAFTER; AND IF THE DIESEL GENERATOR BECAME XNOPERABLE DUE TO ANY CAUSE OTHER THAN PREVENTXVE MAINTENANCE OR TESTXNG, DEMONSTRATE THE OPERABILITY OF THE REMAINING OPERABLE DIESEL GENERATORS BY PERFORMING SPECXFXCATION 4.8.1.1.2A.2 MITHXN 24 HOURS*;
RESTORE THE DIESEL GENERATOR TO OPERABLE STATUS MITHXN 2
H R
OR BE IN AT LEAST HOT STANDBY MXTHIN THE NEXT 6 HOURS AND IN COLD SHUTDOWN MITHXN THE FOLLOMXNG 30 HOURS.
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BASES 3/4.8.1, 3/4.8.2, 3/4.8.3:
THE A.C.
AND D.C.
SOURCE ALLOWABLE OUT-OF-SERVXCE TXMES ARE BASED ON REGULATORY GUIDE 1.93, "AVAXLABILITYOF ELECTRXCAL POWER SOURCES,"
DECEMBER 1974.(A)
WHEN ONE DIESEL GENERATOR XS XNOPERABLE, I
ERT EXCEPT FOR THE ALLOWED OUTAGE TXME ASSOCXATED WXTH ACTXON STATEMENT B.
OF SPECXFXCATXON 3.8.1.1.
THXS ALLOWED OUTAGE TXME WAS CHANGED TO BE CONSXSTENT WITH THE RECOMMENDATION OF DIABLO CANYON POWER PLANT DIESEL GENERATOR ALLOWED OUTAGE TIME STUDYt MAY 1989 Paclflc aaa and Electric Company
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PRA CALCULATIONS SYSTEM ANALYSIS CORE DAMAGE SEQUENCES RESULTS Paclflc Oaa and Electric Company
TABLE4-1 DEFINITIONOF CALCULATIONS Calculation No. of DGs Allowed Outa e Time Period of Scheduled Overhaul on Swing DG with Unit1 at ower 1A
,5 3 Days 0 Days 18 7 Days 3 Days 0 Days 10 Days 7 Days 7 Days No Maintenance 7 Days 0 Days 0 Days 7 Days 1 year This calculation evaluates the risk ifthe swing DG were unavailable forthe entire'ear under a 7-day AOT.
Q0070:1D/050989 4-22 pacltic Gas and Electric Company
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SYSTEM ANALYSIS FOUR DISTINCT GUANTIFICATIONS 3-DAY AOT (DCPRA) 7-DAY AOT SCHEDULED MAINTENANCE ZERO MAINTENANCE NON-SEISMIC SEISMIC RESULTS IN TABLE 4-3 EQUATIONS IN APPENDIX A Pacltlc Oaa and Elactrlc Coepany
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TABLE4-3 DIESEL GENERATOR SPLIT FRACTIONVALUES Split Fraction GF1 GG1 GG2 GG3 GH1 GH2 GH3 GH4 GHS GH6 2Gl 2G2 2G3 2G4 2G5 2G6 2G7 2GS 2G9 2GA 2H1 2H2 2H3 2H4 2HS 2H6 2H7 2HS 2H9 2HA 2HB 2HC 2HD 2HE 2HG 4.523 E42 4.477 E42 5.561E42 4.523 E42 4A36E-02 SAOSE42 8.265 E-02 4.477 E42 5.561E42 4.523 E42 4.396 E42 5.364E42 6.250 E-02 2.898 E41 4.436E42 5.408 E42 8.265 E42 4.477 E42 5.561E42 4.523 E42 4.356E-02 5.320E-02 6.206E42 6.922 E42 7.729 E41 4.396 E42 5.364E42 6.250E42 2.898 E41 4.436E42 5.408 E42 8.265 E42 4.477 E42 5.561 E42 4.523 E42 8.510 E42 8.417 E42 9.502 E42 8.510 E42 8.334 E42 9.329 E42 1.115 E41 8.417E42 9.502 E42 8.510 E42 8.251E-02 9.244 E42 1.016E41 1.903 E-01 8.334 E42 9329 E42 1.115E41 8.417 E42 9.502 E42 8.510 E-02 8.169 E-02 9.162 E42 1.005 E41 1.112 E-01 5.269 E41 8.251E42 9.244 E42 1.016E41 1.903 E41 8334 E42 9.329 E42 1.115 E41 8.417E42 9.502 E-02 8.510 E42 Cele.1A &2(DCPRA) 3 Day AOTforall Diesels Nonseismic Seismic 4.946 E42 4.909 E42 5.682 E42 4.946642 4.878 E42 5.545 E42 8.063 E42 4.909 E42 5.682 E42 4.946 E-02 4.847 E-02 5.507 E42 6.254E42 2.726E41 4.878 E42 5.545 E42 8.063 E42 4.909 E42 5.682 E42 4.946E42 4.817 E42 5.470 E42 6.205 E42 6.996 E42 7.521E-01 4.847 E42 5.507 E42 6.254 E42 2.726E41 4.878842 5.545 E42 8.063 E42 4.909 E42 5.682 E-02 4.946 E42 8.721E42 8.654 E42 9.428 E42 8.721E42 8.595 E42 9.275 E42 1.090 E41 8.654 E42 9.428 E42 8.721 E42 8.537E42 9.205 E42 9.964 E42 1.851E41 8.595 E42 9.275 E42 1.090 E41 8.654 E42 9.428 E42 8.721E42 8.481E42 9.138 E42 9.863 E42 1.087 E41 5.214E41 8.537E42 9.205 E42 9.964 E42 1.851 E41 8.595 E42 9.275E42 1.090 E41 8.654 E42 9.428 E42 8.721E42 Calcs.1B &3 &4 7 Day AOTforall Diesels Nonseismic Seismic GG4 4.344E42 GH7 4.324E42 GHB 4.784E42 GH9 4.344E42 GGS 8.114E42 GHA 8.064E42 GHB 8.685E42 2GC 4.631E42 2GI 8.531E42 2GE 4.324E42 2HI 4.585E42 2HJ 5.573E42 Calcs.2,3 &6 Scheduled Maintenance on Diesel 13 S.F. Nonseismic S.F. Seismic (1) 3.711E42 3.687 E42 4.395 E42 3.711 E42 3.668 E42 4.202E.-02 8.933 E-02 3.687 E42 4.395 E42 3.711E42 3.651E42 4.145 E-02 5.629E42-3.834 E41 3.668E-02 4.202 E42 8.933 E42 3.687 E42 4.395 E42 3.711E42 3.636E42 4.090 E42 5.589 E-02 6.415E42 8.494 E41 3.651 E42 4.145 E42 5.629842 3.834E41 3.668 E42 4.202 E42 8.933 E42 3.687 E42 4.395 E42 3.711E42 7.561 E42 7.507 E42 8.226E42 7.561E42 7.462 E42 8.060E42 1.008 E41 7.507E42 8.226E42 7.561E-02 7.419 E42 7.990 E42 8.852 E42 2.100 E41 7.462 E42 8.060 E42 1.008 E41 7.507 E42 8.226 E42 7.561 E42 7.379 E42 7.925 E42 8.739 E42 1.002 E41 6.230 E41 7.419 E42 7.990 E42 8.852E42 2.100 E41 7.462 E42 8.060 E42 1.008E41 7.507E42 8.226E-02 7.561E42 Cele. S Zero Diesel Maintenance Nonseismic Seismic Note: (1)
This quantification was used to evaluate core damage sequences that involved failure of the swing DG. The DG split fractions not listed for this case were not needed to quantify these sequences.
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CORE DAMAGE SEQUENCES NON-SEISMIC SEQUENCES DOMINANT SEQUENCE MODEL SCHEDULED MAINTENANCE SEQUENCES APPENDIX 8 SEISMIC SEQUENCES SEIS4 COMPUTER MODEL COMBINATIONS OF SEISMIC/NON-SEISMIC FAILURES SCHEDULED MAINTENANCE TERMS APPENDIX C
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TABLE4-4 ABSOLUTE FREQUENCY RESULTS Period of Scheduled Overhaul on Swing DG
- "'"'requency
~er ~ear 1A 3 Day 0 Days*
2.078 E-04 1B 7 Day 0 Days 2.120 E-04 3 Day 10 Days 2.124E-04 7 Day 7 Days 2.152E-04 7 Day 0 Days 2.017E-04 No Maintenance 0 Days 2.042 E-04 7 Day 1 Yr.
4.650 E-04
- DCPRAAssumption; see Ref.4and 14 90070: 1D/050989 4-25 Pacilic Gas and Eloctrlc Company
TABLE4-5 RELATIVERISK RESULTS
~Dettri tion Risk Ratio Comments Impact ofAllowed Outage Time 3 Day AOT:
-5 DG configuration 0.05>>
Risk during AOT/risk during base period with no maintenance 7-day AOT:
-5 DG configuration
-6 DG configuration 0 08*
0.08*
Risk during AOT/risk during base period with no maintenance Risk during AOT/risk during base period with no maintenance Impact of Scheduled Outages
-5 DG configuration (3 Day AOT)
+ 10Days
-5 DG configuration (7 Day AOT)
+ 7Days 0.04 0.03 Risk for scheduled outage/
risk for 18 months(72-hour AOT)
Risk for scheduled outage/
risk for 18 months(7-day AOT)
-6 DG configuration (7 Day AOT)
+ 7Days
'ased on mean maintenance duration.
0.00 No scheduled outage/
risk for 18 months(7 Day AOT)
'V Q0070:1Di050989 4-26 Pacific Gas and Elecirlc Company
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RELIABILITYANAlYSIS OVERVIEM MODELING TECHNIQUES AND DATA COMPATIBLE uITH DCPRA ASSESS COMPLIANCE WITH DESIGN BASIS CRITERIA (LOOP, LOOP/LOCA)
MISSION TIME CONSISTENT WITH REGULATORY REQUIREMENTS (BLACKOUT)
MODEL DESIGNED TO BE STAND-ALONE, INCLUDES SUPPORT SYSTEMS IN FAULT TREES RESULTS IN TABLES 5.8 AND 5.9 FAULT TREES IN APPENDIX D Pacltlc Oaa and Electric Company
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RELIABILITYSTUDY OVERVIEW COMPARISON NUMBER OF DIESEL GENERATORS BRU SWICK DIABLO
~CA YO EXTEND AOT FROM 3 DAYS TO 7 DAYS YES LENGTHEN QUICK START INTERVAL FROM 12 TO 72 HOURS & STI FROM 2 TO 24 HOURS CASES ANALYZED:
BASELINE LOOP EVENT LOOP WITH LOCA IN ONE UNIT TOP-LEVEL (REDUCED)
TREES TIME DEPENDENT, PHASED MISSION APPROACH (FRANTIC)
DIESEL CROSS-TIE BETWEEN UNITS YES YES YES YES YES YES YES YES YES YES YES YES SWING DG ONLY USE OF PLANT SPECIFIC DATA COMMON CAUSE METHOD TESTING PRACTICE IN AOT'ES BINOMIAL YES BETA-FACTOR SIMULTANEOUS SEQUENTIAL Paclflc Oaa and Electric Cotnpany
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CALCULATION MODELS CURRENT FIVE DIESEL CONFIGURATION (3 AND 7-DAY AOT)
PLANNED SIX DIESEL CONFIGURATION (7-DAY AOT) 0 ALL DGS IN STANDBY LOOP EVENT IN BOTH UNITS LOCA IN UNIT 1 WITH LOOP EVENT 0
AOT CONDITION (ONE DG OUT OF SERVICE)
LOOP EVENT LOCA IN UNIT I WITH LOOP EVENT Pacific Oaa and Elactrlc Company
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TABLE 5-8 RELATIVERISK ANALYSIS RESULTS'verage/
Maximum Risk Ratio Standby Risk 72-Hour AOT-5 DGs LOOP 1.33 E-05/
1.48E-05 0.06 2.16E-04 LOOP/LOCA 7.74E-11/
9.41E-11 0.08 1.03E-09 7-Da AOT-5DGs LOOP 1.68E-05/
2.15E-05 0.08 2.19E-04 LOOP/LOCA 1.03 E-10/
1.42E-10 0.10 9.93E-10 7-Da AOT-6DGs LOOP 9.09E-06/
1.14E-05 0.05 1.91E-04 LOOP/LOCA 8.78E-11/
1.27E-10 0.13 6.55E-10 Q0070: 1 D/050989 5-26 Pacific Gas and Electric Company
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TABLE 5-9 AVERAGEANNUALRISK RESULTS
. 72-HourAOT-5DGs Annual Risk LOOP 2.29E-04 LOOP/LOCA 1.10E-09 7-Da AOT-5DGs LOOP 2.35E-04 LOOP/LOCA 1.10E-09 7-Da AOT-6 DGs LOOP 2.00E-04 LOOP/LOCA 7.43E-10 Q0070:lDi050989 5-.27 Pacific Gas and Electric Company
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SUMMARY
OF RESULTS 1.
THE FREQUENCIES FOR ALL CASES ARE ACCEPTABLY LOW (IN THE E-4 RANGE).
2.
THE RELATIVE RISK RATIO CRITERION IS SATISFIED FOR ALL CASES BY BOTH METHODS OF ANALYSES.
3.
THE EFFECT OF CHANGING FROM A 72-HOUR TO A 7-DAY AOT IS INSIGNIFICANT, ON THE ORDER OF 1 PERCENT TO 3 PERCENT.
4.
THE EFFECT OF ADDING THE SIXTH DG IS GREATER THAN THE EFFECT OF CHANGING TO A 7-DAY AOT, WITH A DECREASE ON THE ORDER OF 5 PERCENT TO 15 PERCENT.
5.
THE TWO ANALYSES PROVIDE RESULTS WHICH ARE CONSISTENT.
THE TRENDS OF THE RESULTS FOR THE THREE CASES ARE COMPARABLE BETWEEN THE PRA AND RELIABILITYANALYSES.
- FURTHER, THE MAGNITUDE OF THE FREQUENCY RESULTS ARE COMPARABLE BETWEEN THE TWO DIFFERENT QUANTITATIVEAPPROACHES.
Paclflc Oaa and Electric Company
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TABLE6-1 ANALYTICALRESULTS('I FOR UNPLANNEDAND PLANNED MAINTENANCEACTIVITIES
~PRA A Un lanned 8c Planned+
Un lanned Reliabili Anal sis Un lanned BASE CASE
~Fre uenc Relative Frecruency Ratio~~>
~Fre uen Relative Ratio<'I 3-Day AOT/5 DGs (10 day Outage)<"
2.12E-04 2.08E-04 0.05 LOOP 2.29E-04 LOCA/
LOOP 1.10E-09 0.06 0.08 CASE 2 7-Day AOT/5 DGs (7 day Outage)"'.15E-04 2.12E-04 0.08 LOOP 2.35E-04 LOCA/
LOOP 1.10E-09 0.08 0.10 CASE 3 7-Day AOT/6 DGs (0 day)('>
2.02E-04 2.02E-04 0.08 LOOP 2.00E-04 05 LOCA/
LOOP 7.43E-10 0.13
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PRA reflects frequency for Unit 1 only, whereas reliabilityconsiders frequency for both units (2)
Duration of outage for planned maintenance.
(3)
AOT Risk Level/Non-AOT Risk Level 00070:1Di050989 6-4 PsciBc Gss snd Electric Company
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