BRIE F ING ON RISK- INF ORME D RE GUL AT ION Co mmissio n Me - PowerPoint PPT Presentation

BRIE F ING ON RISK- INF ORME D RE GUL AT ION • Co mmissio n Me e ting • Ma y 11, 2017

Ke y Me ssa g e s • Ana lytic a l impro ve me nts suppo rt mo re a dva nc e d risk-info rme d initia tive s. • Risk insig hts ha ve e nha nc e d re a c to r sa fe ty a nd impro ve d de c isio n-ma king . • I nve stme nts in infra struc ture , c a pa c ity, a nd me tho ds a re unde rwa y to a ddre ss te c hnic a l a nd c ultura l c ha lle ng e s. 2

Ove rvie w • Our risk-info rme d jo urne y - Bill De an, NRR • I mpro ving sa fe ty, info rme d b y risk insig hts - CJ F o ng , NRR • E nsuring a ppro pria te o ve rsig ht o f ne w risk-info rme d initia tive s - Ale jandro Ale n, Re g io n 2 • I mpro ving inte g ra te d risk-info rme d de c isio nma king (RI DM) a nd pro b a b ilistic risk a sse ssme nt (PRA) re a lism - Ande rs Gilbe rtso n, RE S • Cre a ting a c ulture o f risk-info rme d re g ula tio n - Jo e Giitte r, NRR 3

Sta tion Bla c kout Risk Re duc e d for a Spe c trum of Ha za rds SBO Rule (1989) Ma inte na nc e Rule (1996) – SSC re lia b ility a nd a va ila bility Risk I nfo rme d L ic e nsing SBO Risk Ac tio ns (1990s - pre se nt) Po st-9/ 11 Re q uire me nts (B.5.b me a sure s - 2006) NF PA-805 F ire Pro te c tio n Sta nda rd (2012 - pre se nt) Po st-F ukushima I mpro ve me nts (Mitig a tio n Stra te g ie s fo r E L AP) Pe rfo rmanc e -Base d, Risk-I nfo rme d Appro ac he s 4

Risk- Informe d Applic a tions Ca n Afford Gre a te r Ope ra tiona l F le xibility a nd Improve d Sa fe ty Risk-I nfo rme d Sub mitta ls Unde r Re vie w 150 • Othe r T o rna do Missile Risk-info rme d NF PA-805 50.69 lic e nsing is S-PRA GSI -191 Sub mitta l Numb e r 120 T ST F -425 T ST F -505 tre nding I L RT 90 upwa rd. • F L E X is b e ing 60 inc o rpo ra te d into RI DM. 30 0 5 F Y14 F Y15 F Y16 F Y17 F Y18 5 5

Prog re ss in RIDM Continue s but Cha lle ng e s Re ma in • Ma jo r risk-info rme d lic e nsing re vie ws ha ve pro ve d c ha lle ng ing – Na tio na l F ire Pro te c tio n Asso c ia tio n (NF PA) Sta nda rd 805 – Risk-I nfo rme d T e c hnic a l Spe c ific a tio ns (RI T S) I nitia tive 4b • No t a ll sta ff ha ve e mb ra c e d RI DM • I nc o nsiste nt le ve ls o f PRA a c c e pta b ility 6

Se ve ra l Ma jor Risk- Informe d Initia tive s Are unde r Re vie w • T e c hnic a l Spe c ific a tio ns T a sk F o rc e (T ST F ) 505: risk-info rme d c o mple tio n time s (“4b ”) • T ST F -425: risk-info rme d surve illa nc e fre q ue nc ie s (“5b ”) • Risk-info rme d Ge ne ric Sa fe ty I ssue (GSI )-191 • 50.69: risk-info rme d struc ture , syste m, o r c o mpo ne nt (SSC) c a te g o riza tio n • Se ismic PRA (NT T F 2.1) 7

PRA Must Be Suita ble for the Applic a tion 4b, Risk- Informe d Comple tion T ime s NF PA- 805, Risk- Informe d Re q uire d • Gre a te r re lia nc e F ire Prote c tion sc o pe , le ve l o f o n PRA de ta il, • Mo re fle xib ility te c hnic a l 50.69 SSC Ca te g oriza tion fo r lic e nse e ro b ustne ss, • Mo re c o mple x a nd pla nt sta ff re vie w 5b, Risk- Informe d re pre se nta tio n Surve illa nc e F re que nc ie s Risk- Informe d Inse rvic e Inspe c tion 8

Industry PRA Mode ls Ha ve Improve d Gre a tly Ove r the L a st De c a de Se ismic , Hig h I nte rna l I nte rna l I nte rna l Winds, o r E xte rna l E ve nts F lo o ding F ire F lo o ding No No 7% No 10% Ye s No 37% Ye s 46% 54% Ye s Ye s 63% 90% 93% Are mo de ls ac ro ss the fle e t pe e r-re vie we d? 9 So urc e : 2013 le tte r fro m Nuc le a r E ne rg y I nstitute (NE I ) to NRC (ML 13354B997)

NRC SPAR Mode ls Ha ve Improve d Gre a tly ove r the L a st De c a de Numb e r o f SPAR Mo de ls 25 L e ve l 2 20 Ne w Re a c to r De sig ns E xte rna l E ve nts 15 10 5 0 2005 2016 T ime 1 0

Risk Insig hts Ga ine d from F ire PRA Are Driving Sa fe ty Improve me nts • Re a c to r Co o la nt Pump (RCP) se a ls • Additio na l fe e d wa te r pumps • Alte rna te RCP se a l inje c tio n • Ne w die se l E xample auxiliary fe e dwate r g e ne ra to rs NF PA-805 mo dific atio n (Arkansas Nuc le ar One ) • I mpro ve d b a tte rie s • T ra ditio na l fire pro te c tio n e q uipme nt (shie lding , de te c tio n, e tc .) 1 1

Risk Insig hts Ha ve Re sulte d in GSI- 191 E nha nc e me nts • T a rg e te d re mo va l o f pro b le ma tic insula tio n • Stra ine r mo dific a tio ns (no t just size ) tha t fo c us o n risk- sig nific a nt sc e na rio s • I mpro ve d pro c e dure s info rme d b y mo re re a listic a na lyse s S o urc e : S o uth T e xas Pro je c t GS I -191 lic e nse ame ndme nt re que st (L AR) 1 2

NRC Is Upg ra ding the Infra struc ture Ne e de d to Support RIDM • F a c ts a nd Ob se rva tio ns (F &O) inde pe nde nt a sse ssme nt pro c e ss • I mpro ve d g uida nc e (e .g ., Re g ula to ry Guide (RG) 1.174 upda te ) • I nte ra c tio ns with industry to impro ve L AR c o nsiste nc y a nd q ua lity 1 3

NRC Is Ove rse e ing Ne w Risk- Informe d Initia tive s • 10 CF R 50.69 – c a te g o riza tio n a nd tre a tme nt o f SSCs • Risk-info rme d te c hnic a l spe c ific a tio n initia tive s – 4b : risk-info rme d c o mple tio n time s – 5b : re lo c a tio n o f surve illa nc e re q uire me nt fre q ue nc ie s to lic e nse e -c o ntro lle d pro g ra m 1 4

50.69 Allows T re a tme nt of SSCs Ac c ording to Sa fe ty Sig nific a nc e • Adjust sc o pe o f SSCs sub je c t to “spe c ia l tre a tme nt” c o ntro ls • Rule c o nsists o f thre e ma jo r e le me nts 1. Ca te g o riza tio n Pro c e ss 2. Alte rna te ~ 25% ~ 1% T re a tme nt 3. F e e db a c k a nd Pro c e ss Adjustme nts ~ 75% ~ 99% 1 5

50.69 De monstra te d throug h Vog tle Pilot Applic a tion • Pilo t Pla nt: Vo g tle Units 1 a nd 2 • 2012 – 2014: L AR re vie w a nd a ppro va l • 2016: I nspe c tio n pe r I nspe c tio n Pro c e dure (I P) 37060 • Pro g ra m a nd imple me nta tio n – 4 syste ms c a te g o rize d – 1 a lte rna te tre a tme nt (limite d) • Pro g ra m c o nsiste nt with sa fe ty e va lua tio n a nd 50.69 re q uire me nts • I P 37060 suppo rts a dditio na l inspe c tio n 1 6

NRC Is Pre pa re d to Inspe c t Imple me nta tion of 4b R - Risk I - I nfo rme d C - Co mple tio n T - T ime s Risk- Informe d E xisting T S Comple tion T ime Compone nt Comple tion T ime (RICT ) L imit Inope ra ble “F rontstop” “Ba c kstop” RICT L imit Risk Ma na g e me nt Ac tions 1 7

NRC Is Pre pa re d to Inspe c t Imple me nta tion of 4b • 2012 – Vo g tle sub mitte d L AR – SE R e xpe c te d la te r in 2017 • I P 71111.13, Ma inte na nc e Risk Asse ssme nt • Unde r re vie w to inc lude RI CT inspe c tio n • 2007 – So uth T e xa s Pro je c t first to a do pt • T e mpo ra ry I nstruc tio n 2515/ 170 1 8

NRC Continue s to Re vie w Imple me nta tion of the Surve illa nc e F re que nc y Control Prog ra m 5b • T ST F -425 a nd NE I -04-10 • Ado pte d b y ~ 75% o f industry (Vo g tle 2012) • I P 71111.22, Surve illa nc e T e sting – Appe ndix A 24 Hrs 3 Days 7 Days 31 Days 92 Days 6 Months 18 Months 1 9

NRC Is Improving Inte g ra te d Risk- Informe d De c isionma king • Guida nc e o n RI DM • I mpro ve d PRA re a lism 2 0

Risk Ana lysis Is One Princ iple of the Inte g ra te d RIDM Proc e ss Princ iple 3 Ma inte na nc e of Sa fe ty Ma rg ins Princ iple 2 Princ iple 4 De fe nse - in- De pth Risk Ana lysis Consiste nc y Inte g ra te d Risk- Informe d De c isionma king Princ iple 1 Princ iple 5 Curre nt Re g ula tions Pe rforma nc e Me t Monitoring 2 1

Sta ff Re vise d De fe nse - in- De pth (DID) Guida nc e in RG 1.174 Ba se d on Commission Dire c tion • Dra ft Re visio n 3 o f RG 1.174 c o mple te d in re spo nse to SRM o n SE CY-15-0168 • E nha nc e d g uida nc e o n the a g e nc y’ s inte rpre ta tio n a nd imple me nta tio n o f the DI D philo so phy • Ove rse e n b y the a g e nc y’ s Risk-I nfo rme d Ste e ring Co mmitte e 2 2

Ke y E nha nc e me nts to DID Guida nc e in RG 1.174 Re vision 3 • E xpa nde d intro duc to ry a nd b a c kg ro und disc ussio ns o n the DI D philo so phy • De fine d e a c h DI D e va lua tio n fa c to r • Pro vide d g uida nc e o n ho w to a ddre ss the DI D e va lua tio n fa c to rs individua lly a nd in a n inte g ra te d fa shio n 2 3

Additiona l E nha nc e me nts to RG 1.174 Re vision 3 • Disc ussio n o n a g g re g a tio n o f risk • Ac c e pta nc e g uide line tra nsitio ns • Pro vide s stro ng e r c o nne c tio n to g uida nc e o n tre a tme nt o f unc e rta inty (NURE G-1855) • T ra nsitio ning fro m la rg e re le a se fre q ue nc y (L RF ) a nd c o nditio na l c o nta inme nt fa ilure pro b a b ility (CCF P) to la rg e e a rly re le a se fre q ue nc y (L E RF ) a nd c o nta inme nt pe rfo rma nc e e xpe c ta tio ns fo r ne w re a c to rs 2 4