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| number = ML110910132
| number = ML110910132
| issue date = 03/31/2011
| issue date = 03/31/2011
| title = Licensee Handouts from 3/31/11 Meeting with Pacific Gas and Electric Station Seismic Update(Tac ME5033 and ME5034)
| title = Licensee Handouts from 3/31/11 Meeting with Pacific Gas and Electric Station Seismic Update
| author name =  
| author name =  
| author affiliation = Pacific Gas & Electric Co
| author affiliation = Pacific Gas & Electric Co
Line 9: Line 9:
| docket = 05000275, 05000323
| docket = 05000275, 05000323
| license number = DPR-080, DPR-082
| license number = DPR-080, DPR-082
| contact person = Polickoski J T, NRR/DORL/LPL4, 415-5430
| contact person = Polickoski J, NRR/DORL/LPL4, 415-5430
| case reference number = TAC ME5033, TAC ME5034
| case reference number = TAC ME5033, TAC ME5034
| package number = ML110910125
| package number = ML110910125
Line 19: Line 19:


=Text=
=Text=
{{#Wiki_filter:DCPP Long Term Seismic Program Update Eval uatio n of Up date d Se ismi c Ha zar d  In fo rm ation Flowchart A -
{{#Wiki_filter:DCPP Long Term Seismic Program Update Evaluation of Updated Seismic Hazard Information DRAFT (03-29-2011)
O verview Up da te d LTSP S e ism i c Haza r d I n p u t Informat ion Received by DCPP (2)or Te n Ye ar s Sin c e Pr ior U pda te (1)See Flowch art C See Flowchart B Su bmit Peer-Re v iewed Up date d LTSP Informatio n to N u clear Regu la tory Commiss i on (NRC) /Nuclear Rea c tor R egulation (N RR)R e start 10 Ye ar Int e rv al No te s: (1)   Upd a te to be per formed  at l e ss than a 1 0 ye ar i n terv al i f sig n ific ant new info rma t ion bec omes a v aila ble. Th e st art o f e a c h i n ter v al        to b e ba sed on s ubmitta l dat e of prio r up date.(2)   Seis mic Ha zar d Inp u t is de velo ped by th e P G&E G eosc i enc e s D e p a rtment. Ty pes of i nput inc l ude seis mic haz ard cur v es ,       dete r minist ic gr oun d motion res pon se s p ec trum, so urc e ch arac teri zati on, g r ou nd motio n sp ect r al s hap es, e t c.(3)   Seis mic Margin s A sse ssment base d o n de terminis tic g r ou nd motio n re spo n se spe c tru m.(4)   Seis mic Ha zar d Cu rve s ar e ty pica lly a v aila ble with in 3 0 da ys.DR AFT (0 3-2 9-20 1 1)Seismic Probabili stic Risk Assessment Conf irmatory Pa th-Used for Saf e ty Risk As sess me nt (c an not s t art unt il se ismic h a zar d cu rve s ar e av ailab l e (4)a nd ty pica lly, the ass e ssmen t wi ll tak e 6 mo nths to co mp l e t e) Seis mic Margins Assessment Pr ima r y P a th-Use d fo r Opera b ilit y Determina t ion (to be perf o rmed w i thi n 24 hou rs o f re ceip t of data) (3)Process for Updates to the Long Ter m Se ismic Pro g ra m (L TSP) Seismic Probabilistic Risk an d Seismic Margins Assessment (t o be p e rfo rme d on a 10 ye ar in terva l) (1)
Flowchart A - Overview Process for Updates to the Long Term Seismic Program (LTSP)
DCPP Long Term Seismic Program Update Eva l u a tion of U pda ted Seism i c Haza rd Info rma ti on Flowc h art B - Seismic Margins Assessment Is Mi n. Se i s m i c Mar g i n >1.0?DR AF T (03-2 9-2 011)No tes: (1) T he D e ter m in istic Gr oun d Motion Re spo n se Spec tru m (D GMRS) is de velo ped by t he P G&E G eos cien ces Dep a rtment in a cco rdan ce        w i th p eer-r ev iew ed meth odo logie s.(2) C hang es i n the DG MR S may impact the in-s truc ture res pon se s pect r a, whic h ar e an inp u t to the Hig h C onfid enc e Lo w P r oba bili t y of Fai l ure        (H CL PF) cap a cit i es of S t ruc t ure s , S yste m s , and Co mp onen ts (SSC s).(3) T he H C LP F c apa citie s ar e ba sed on t he meth odol ogie s de fine d in EP RI N P-6 041-SL.(4) T he 1 991 LTS P D G MRS is t hat d e fin ed in the 198 8 LT SP  Fin a l R e po rt, as modi fied by the NRC in SSE R-34 (1991).(5) U pdat e re quir ed if the Upd a ted DG MR S e xce eds the 1991 LTS P D G R M S  at any fre quen cy.(6) U pdat e re quir ed if the Upd a ted DG MR S e xce eds the desi gn b a sis 197 7 H o sgr i Ea rthq uake res pon se s pec trum, as de fined in i n t he DC PP Up date d      Fi nal S a fe ty A naly s is Rep o rt, Sec t ion 2.5, at a n y f r equ enc y (7) T he 1 991 LTS P  D G MRS and/or the 1977 Ho sgri RS ma y be upd ated bas ed n e w infor m a t ion subs equ ent to N R C app r ova l of a L i cen se A m e ndment.Is U pda ted DGMR S Enve lope d by 19 91 L T SP DG MR S (4)?Do Cha nge s to DG MR S R equi re U pda ted H i gh Co nfide n ce Low Pr obab ility of F a ilu re (H CLPF) C apac itie s (2)?No U p da t e HC LP F C a pa c i ti e s f o r I m pa cted Str u ctu r es , Sy stems, and Co mpo nen ts (S SC s) (3)R eas ses s P l ant Seis mic Margin s fo r Impac ted Stru ctur es, Sy stems, and Compon ents (S SCs) w i th U pda ted DG MR S, H C LP F C apa citie s No No Ente r Tech. Spe c. L i mi ting Con d itio n fo r Op era t ion (L CO) fo r Impac ted SSC (s)Deve lop Mod i fic a tion s to R e sto r e S e i s mi c Ma rgi n s (SSC (s) Inop era b le) D o cu men t Up date d LT SP DG MR S (7), Ho sgri RS (7), HC LP F C a pa c i t i e s , Se ismic Marg ins in DCPP Recor d s Ye s E n tr y Po i n t f r om Flo w c h ar t A Ye s Retur n to Flo w c hart A S ubmit Li cens e A m en dment Req uest to Up date 199 1 LT SP DG MR S (5)an d/or 197 7 H o sg ri R e spo n se Sp ectr um (RS) (6)U pdated Seismic Hazar d Informa t ion for Seismic Margins Ass e ss men t (SMA) Rec e ived by DCPP or 10 Year Upd a te-U pd ated De termini s tic Gro und Mo tion Res pons e S pect r um  (D GMRS) (1)Yes U pdat e HC LP F Cap a citi es f o r Impa cted St r u ct u r es , Sy s t em s, a nd C o mpon ents (SS C s) (3), if req u ire d DCPP Long Term Seismic Program Update Evaluation of Updated Seismic Hazard Inf o rmation Fl owch art C - Seism i c Pr oba bilistic Risk Assessment Cond uct SPRA to Dete rmine Seismic Core Damage Fre quenc y (SC D F)With-U pda ted Inpu t Info rmation (3)-U pdat ed  Met hodo logi es (2), (4)Do cument Upda ted SH C, GMSS, Fragilities, and SCDF in DCPP Recor d s No tes: (1) Th e S e ismic H a z a rd C u rv es (SH C) and Gro und Mot i on S p ec tral Sha pe (G MSS) are dev elop ed b y th e P G&E Ge osc i enc e s D epa rtment i n      ac cord anc e  w i th p eer-r e v iew ed meth odo logie s.(2) Th e S e ismic P r ob abili stic Ris k A sses s ment (SP R A) wil l be bas ed o n Ca pab ility Cat egor y II of A S ME/A NS RA-S a-2009 , as mo difi ed        by Re g. G u id e 1.2 00.(3) Inp u t in formati on in clu des seis mic haz ard cur v es, gro und mot i on s pec tral sha pe, a nd f r agi lities.(4) Fr agili ties are bas ed o n the sh ape of th e gr ound mo tion spe c tra l sh ape  and pee r-re viewed frag ility calc ulat ion meth ods        (A SME/A N S RA-S a-2009 , a s modifi ed b y R eg. G u id e 1.200, EP RI T R-1 039 58, 1 002 988, 101 9200)  DRA FT (0 3-29-201 1)Notify Nu clear Re gulato r y Co m m is s i o n (N RC)E n try Poi n t fr om Flo w ch art A Updated Seismic Haza rd Information fo r Seismic Pr obabilistic Risk Assessment (SPRA) R e ceive d by D C PP or 10 Year Update-U pd ated Sei s mic H a zar d C u rve (S HC) (1)-U pda ted Gro und Mot i on Spec tral Sha pe (G MSS) (1)R e tu r n t o F l ow char t A}}
Seismic Probabilistic Risk and Seismic Margins Assessment (to be performed on a 10 year interval) (1)
T Updated LTSP Seismic Hazard Input Information Received by DCPP (2) or Ten Years Since Prior Update (1)
Seismic Probabilistic Risk Assessment Confirmatory Path AF Used for Safety Risk Assessment (cannot start until seismic hazard curves are available and typically, the assessment will take 6 months to complete)
See (4)
Seismic Margins Assessment Primary Path Used for Operability Determination (to be performed within 24 hours of receipt of data)
See (3)
DR Flowchart                       Submit Peer-Reviewed                                        Flowchart C                          Updated LTSP Information to                                       B Nuclear Regulatory Commission (NRC) /
Nuclear Reactor Regulation (NRR)
Restart 10 Year Interval Notes:
(1) Update to be performed at less than a 10 year interval if significant new information becomes available. The start of each interval to be based on submittal date of prior update.
(2) Seismic Hazard Input is developed by the PG&E Geosciences Department. Types of input include seismic hazard curves, deterministic ground motion response spectrum, source characterization, ground motion spectral shapes, etc.
(3) Seismic Margins Assessment based on deterministic ground motion response spectrum.
(4) Seismic Hazard Curves are typically available within 30 days.
 
DCPP Long Term Seismic Program Update Evaluation of Updated Seismic Hazard Information                                      DRAFT (03-29-2011)
Flowchart B - Seismic Margins Assessment Entry Point from Flowchart A Updated Seismic Hazard Information for Seismic Margins Assessment (SMA) Received by DCPP or 10 Year Update (1)
T
                                          - Updated Deterministic Ground Motion Response Spectrum (DGMRS)
Is Updated DGMRS Enveloped by 1991 LTSP DGMRS(4)
                                                                              ?
Yes AF No Do Changes to DGMRS Update HCLPF Capacities for Require Updated High Confidence Impacted Structures, Systems,         Yes Low Probability of Failure (HCLPF) and Components (SSCs) (3)
Capacities (2)
                                                                                ?
No                                      Update HCLPF Capacities for Impacted Reassess Plant Seismic Margins for Impacted Structures,          Structures, Systems, Systems, and Components (SSCs) with Updated DGMRS,                  and Components HCLPF Capacities                                    (SSCs) (3),
if required Is Enter Tech. Spec. Limiting Min. Seismic Condition for Operation              No Margin > 1.0 DR (LCO) for Impacted SSC(s)
(SSC(s) Inoperable)                    ?
Yes Develop Modifications to                            Submit License Amendment Request Restore Seismic Margins                              to Update 1991 LTSP DGMRS (5) and/or 1977 Hosgri Response Spectrum (RS) (6)
Document Updated LTSP DGMRS (7),
Return to                        Hosgri RS(7), HCLPF Capacities, Flowchart A                      Seismic Margins in DCPP Records Notes:
(1) The Deterministic Ground Motion Response Spectrum (DGMRS) is developed by the PG&E Geosciences Department in accordance with peer- reviewed methodologies.
(2) Changes in the DGMRS may impact the in-structure response spectra, which are an input to the High Confidence Low Probability of Failure (HCLPF) capacities of Structures, Systems, and Components (SSCs).
(3) The HCLPF capacities are based on the methodologies defined in EPRI NP-6041-SL.
(4) The 1991 LTSP DGMRS is that defined in the 1988 LTSP Final Report, as modified by the NRC in SSER-34 (1991).
(5) Update required if the Updated DGMRS exceeds the 1991 LTSP DGRMS at any frequency.
(6) Update required if the Updated DGMRS exceeds the design basis 1977 Hosgri Earthquake response spectrum, as defined in in the DCPP Updated Final Safety Analysis Report, Section 2.5, at any frequency (7) The 1991 LTSP DGMRS and/or the 1977 Hosgri RS may be updated based new information subsequent to NRC approval of a License Amendment.
 
DCPP Long Term Seismic Program Update DRAFT Evaluation of Updated Seismic Hazard Information                                    (03-29-2011)
Flowchart C - Seismic Probabilistic Risk Assessment Entry Point from Flowchart A T
Updated Seismic Hazard Information for Seismic Probabilistic Risk Assessment (SPRA)
Received by DCPP or 10 Year Update
                                          - Updated Seismic Hazard Curve (SHC)
                                    - Updated Ground Motion Spectral Shape (GMSS)
(1)
(1)
AF                    Conduct SPRA to Determine Seismic Core Damage Frequency (SCDF)
With
                                              - Updated Input Information
                                              - Updated Methodologies Notify Nuclear (3)
(2), (4)
DR Regulatory Commission (NRC)
Document Updated SHC, GMSS, Fragilities, and SCDF in DCPP Records Return to Flowchart A Notes:
(1) The Seismic Hazard Curves (SHC) and Ground Motion Spectral Shape (GMSS) are developed by the PG&E Geosciences Department in accordance with peer- reviewed methodologies.
(2) The Seismic Probabilistic Risk Assessment (SPRA) will be based on Capability Category II of ASME/ANS RA-Sa-2009, as modified by Reg. Guide 1.200.
(3) Input information includes seismic hazard curves, ground motion spectral shape, and fragilities.
(4) Fragilities are based on the shape of the ground motion spectral shape and peer-reviewed fragility calculation methods (ASME/ANS RA-Sa-2009, as modified by Reg. Guide 1.200, EPRI TR-103958, 1002988, 1019200)}}

Latest revision as of 05:13, 21 March 2020

Licensee Handouts from 3/31/11 Meeting with Pacific Gas and Electric Station Seismic Update
ML110910132
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 03/31/2011
From:
Pacific Gas & Electric Co
To:
Office of Nuclear Reactor Regulation
Polickoski J, NRR/DORL/LPL4, 415-5430
Shared Package
ML110910125 List:
References
TAC ME5033, TAC ME5034
Download: ML110910132 (3)
v • d • e


Text

DCPP Long Term Seismic Program Update Evaluation of Updated Seismic Hazard Information DRAFT (03-29-2011)

Flowchart A - Overview Process for Updates to the Long Term Seismic Program (LTSP)

Seismic Probabilistic Risk and Seismic Margins Assessment (to be performed on a 10 year interval) (1)

T Updated LTSP Seismic Hazard Input Information Received by DCPP (2) or Ten Years Since Prior Update (1)

Seismic Probabilistic Risk Assessment Confirmatory Path AF Used for Safety Risk Assessment (cannot start until seismic hazard curves are available and typically, the assessment will take 6 months to complete)

See (4)

Seismic Margins Assessment Primary Path Used for Operability Determination (to be performed within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of receipt of data)

See (3)

DR Flowchart Submit Peer-Reviewed Flowchart C Updated LTSP Information to B Nuclear Regulatory Commission (NRC) /

Nuclear Reactor Regulation (NRR)

Restart 10 Year Interval Notes:

(1) Update to be performed at less than a 10 year interval if significant new information becomes available. The start of each interval to be based on submittal date of prior update.

(2) Seismic Hazard Input is developed by the PG&E Geosciences Department. Types of input include seismic hazard curves, deterministic ground motion response spectrum, source characterization, ground motion spectral shapes, etc.

(3) Seismic Margins Assessment based on deterministic ground motion response spectrum.

(4) Seismic Hazard Curves are typically available within 30 days.

DCPP Long Term Seismic Program Update Evaluation of Updated Seismic Hazard Information DRAFT (03-29-2011)

Flowchart B - Seismic Margins Assessment Entry Point from Flowchart A Updated Seismic Hazard Information for Seismic Margins Assessment (SMA) Received by DCPP or 10 Year Update (1)

T

- Updated Deterministic Ground Motion Response Spectrum (DGMRS)

Is Updated DGMRS Enveloped by 1991 LTSP DGMRS(4)

?

Yes AF No Do Changes to DGMRS Update HCLPF Capacities for Require Updated High Confidence Impacted Structures, Systems, Yes Low Probability of Failure (HCLPF) and Components (SSCs) (3)

Capacities (2)

?

No Update HCLPF Capacities for Impacted Reassess Plant Seismic Margins for Impacted Structures, Structures, Systems, Systems, and Components (SSCs) with Updated DGMRS, and Components HCLPF Capacities (SSCs) (3),

if required Is Enter Tech. Spec. Limiting Min. Seismic Condition for Operation No Margin > 1.0 DR (LCO) for Impacted SSC(s)

(SSC(s) Inoperable)  ?

Yes Develop Modifications to Submit License Amendment Request Restore Seismic Margins to Update 1991 LTSP DGMRS (5) and/or 1977 Hosgri Response Spectrum (RS) (6)

Document Updated LTSP DGMRS (7),

Return to Hosgri RS(7), HCLPF Capacities, Flowchart A Seismic Margins in DCPP Records Notes:

(1) The Deterministic Ground Motion Response Spectrum (DGMRS) is developed by the PG&E Geosciences Department in accordance with peer- reviewed methodologies.

(2) Changes in the DGMRS may impact the in-structure response spectra, which are an input to the High Confidence Low Probability of Failure (HCLPF) capacities of Structures, Systems, and Components (SSCs).

(3) The HCLPF capacities are based on the methodologies defined in EPRI NP-6041-SL.

(4) The 1991 LTSP DGMRS is that defined in the 1988 LTSP Final Report, as modified by the NRC in SSER-34 (1991).

(5) Update required if the Updated DGMRS exceeds the 1991 LTSP DGRMS at any frequency.

(6) Update required if the Updated DGMRS exceeds the design basis 1977 Hosgri Earthquake response spectrum, as defined in in the DCPP Updated Final Safety Analysis Report, Section 2.5, at any frequency (7) The 1991 LTSP DGMRS and/or the 1977 Hosgri RS may be updated based new information subsequent to NRC approval of a License Amendment.

DCPP Long Term Seismic Program Update DRAFT Evaluation of Updated Seismic Hazard Information (03-29-2011)

Flowchart C - Seismic Probabilistic Risk Assessment Entry Point from Flowchart A T

Updated Seismic Hazard Information for Seismic Probabilistic Risk Assessment (SPRA)

Received by DCPP or 10 Year Update

- Updated Seismic Hazard Curve (SHC)

- Updated Ground Motion Spectral Shape (GMSS)

(1)

(1)

AF Conduct SPRA to Determine Seismic Core Damage Frequency (SCDF)

With

- Updated Input Information

- Updated Methodologies Notify Nuclear (3)

(2), (4)

DR Regulatory Commission (NRC)

Document Updated SHC, GMSS, Fragilities, and SCDF in DCPP Records Return to Flowchart A Notes:

(1) The Seismic Hazard Curves (SHC) and Ground Motion Spectral Shape (GMSS) are developed by the PG&E Geosciences Department in accordance with peer- reviewed methodologies.

(2) The Seismic Probabilistic Risk Assessment (SPRA) will be based on Capability Category II of ASME/ANS RA-Sa-2009, as modified by Reg. Guide 1.200.

(3) Input information includes seismic hazard curves, ground motion spectral shape, and fragilities.

(4) Fragilities are based on the shape of the ground motion spectral shape and peer-reviewed fragility calculation methods (ASME/ANS RA-Sa-2009, as modified by Reg. Guide 1.200, EPRI TR-103958, 1002988, 1019200)

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