L-MT-22-006, 10 CFR 50.55a Request Associated with the Monticello Sixth Inservice Testing Ten-Year Interval OMN-26 (L-MT-22-006)
| ML22049B323 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 02/18/2022 |
| From: | Emanuelson M Northern States Power Co, Xcel Energy |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| L-MT-22-006 | |
| Download: ML22049B323 (5) | |
Text
W EB-BASED PROP OS ED ALTER NATI VE SUB MIS SI ON 10 CF R 50. 55a( z )( 1)
Sub m ission Dat e: Fe brua r y 18, 2022 Sub m itt e d By: Mar y Ema nue lson Doc um en t S en sit ivit y: Non-Se nsitive Lic en see : Xc el Ener gy Pl ant Uni t( s) an d Doc ke t No( s): Monti ce llo (05000263)
L ice ns ee Cont ac t:Ma r y Ema nuel son m ar y.e ma nuelson@xc el ene rgy. com
( 612) 330-5850
Pr oj ec t Tit le :
10 CF R 50.55a R eque st Assoc ia ted with the Montic e llo S ixth I nser vic e Testi ng Te n-Yea r I nte rva l OMN-26 ( L-MT-22-006)
Pr opose d Alt er nat ive Num be r or Id en tif ie r:
VR-07
Re qu est Type :
10 CF R 50.55a (z ) (1)
Inse rvic e In spe ct ion ( ISI) or Inse rvi ce T est ing ( IST )
Inse rvi ce Te sting (I ST)
Re qu est e d Com pl et ion Date :
Febr ua ry 28, 2023
Bri ef De scr ipt ion of Pr opose d Alt er nat ive Nor the rn St ate s P ower C ompany, a M innesot a cor por ati on, doing busi ness as Xce l Ene r gy ( her e af ter 'NS PM', her e by r eque sts NR C author iz ati on of t his 10 CF R 50. 55a r eque st to suppor t the impl eme nta tion of the sixt h I ST ten-ye ar int er val f or Montic e llo Nuc le ar Ge ner at ing Pla nt ( MNGP). Pr opose d Re lie f Re que st VR-07 re quest s t o a dopt Ame ri ca n S ocie ty of Me cha nica l Engi nee rs ( AS ME) Code C ase OMN-26,
'Alte r nate R isk-Inf or med and Ma rgin Ba se d Rul es for Inse rvi ce Te sting of Motor Ope ra te d Val ves [M OVs].'
Pr opose d Dur ati on of Alte rn at ive (i n te rm s of ISI/ IST Pr ogram In te r val wit h St art and En d Date s) :
Thi s r eque st, upon appr oval, wi ll be appli ed to t he MNGP si xth I ST te n-ye ar i nter va l st ar ting Octobe r 1, 2022 and is s che duled to end May 31, 2032.
Ap pli cab le ASM E Cod e Req uir em en t s The f oll owing pa ra gra phs and subpar agr a phs in Ma ndator y Appe ndix I I I of the AS ME OM C ode ar e a ff ec te d by this Re quest to adopt Code Case OMN-26.Appe ndix I I I, I I I-3310 ' lnse r vice Te st Int er val ', subpa r agr aph (c ) : ' The ma ximum inse rvi ce te st inte rva l shall not exc e ed 10 yr.
MOV inse rvic e te sts conduc te d pe r par a. I I I-3400 may be used to sat isf y this r equi re ment.' Appendix I II, I II-3700 ' Risk-I nfor me d MOV Inse rvi ce Te sting'. Ris k-inf or me d MOV inse r vice t est ing t hat inc orpor at es ri sk ins ights in c onjunc tion wi th pe rf or manc e ma rgi n to es tabl ish MOV groupi ng, ac ce ptanc e c rit er ia, exe rc ising r equir e ments a nd te sting inte r val ma y be im plem ente d. Appendix II I, Subpa ra gr aph II I-3721,
'[ High S af e ty S ignif ic ant Compone nt (HSS C) ] MOVs' : ' HSS C M OVs shal l be t este d i n a cc orda nc e wi th pa r a. I II-3300 a nd e xer ci sed in ac cor danc e with par a. I I I-3600 HS SC MOVs tha t ca n be ope r ate d dur ing plant ope ra tion shal l be e xe rc ise d qua rte r ly, unle ss t he potent ial incr ea se in cor e da mage f r eque ncy ( CDF) a nd la r ge ea rl y r el ea se (LER ) assoc ia te d with a longe r exe rc ise i nter va l is sma ll. ' Appe ndix II I, II I-3722 ' [Low S af e ty S ignif ic ant Compone nt (LS SC )] MOVs', subpar a gra ph ( d) : ' LSS C MOVs sha ll be inser vic e te ste d a t le a st e ver y 10 yr. in ac cor danc e with par a. I I I-3310.'
Ap pli cab le Ame ri can S ocie ty of M ec han ical En gin ee rs (AS ME ) Boil er an d Pr es sur e Vesse l Cod e (B PV Code ), or AS ME Op er ati on and Main te nan ce â-of Nuc le ar Powe r Plant s (O M Cod e), Ed it ion and Add en da AS ME OM Code, Ope ra tion and Ma inte nanc e of Nucle ar Power Pla nts, 2017 Edi tion wi th no Addenda.
Cu rr en t IS I or IS T Pr ogr am Int er val Nu m be r and St ar t/ End Dat es MNGP is cur r ent ly on its fi ft h I ST ten-yea r int er val tha t is s che duled to end on S epte mbe r 30, 2022. The MNGP sixth IS T t en-yea r inte r val be gins on Oc tober 1, 2022.
Ap pli cab le ASM E Cod e Comp one nt s an d/or Syst em De scr ip tion Ac tive sa f ety r ela te d MOVs t hat ar e r equir e d by Subse ct ion I STC of the 2017 Edition of the AS ME OM Code to be tes ted in a c cor danc e with Appe ndix II I e ntitle d Pr e ser vic e and Ins er vice Te sting of Act ive Ele ctr ic Mot or-Oper at ed Va lve Asse mblie s in W at er-c oole d R ea ctor Nuc le ar Power P la nts.
Re ason f or Re qu est In ac cor danc e with 10 C FR 50.55a ( z) (1), NSP M i s r eque sting a pprova l t o a dopt OMN-26 in conj uncti on with imple me nting Manda tor y Appe ndix II I a s pa rt of the 2017 Edition of the OM Code a t t he MNGP.
Code Ca se OMN-26 bett er a ligns the ins er vic e test int er val s in Ma nda tor y Appe ndix I I I to the Ris k a nd Ma rgi n Ba se d Lic ense e MOV Pr ogra ms deve loped in re sponse to NRC Gene ri c Le tte r 96-05, 'P er iodi c Ve r ifi ca tion of Design-Ba sis Ca pabi lity of Sa f ety-Re la ted Motor Ope ra te d Va lves, ' tha t have be en in e f fe ct sinc e 1998. Ther e is no f or ma l te c hnica l basis in Appendix II I f or li miting the ma ximum inse r vice test int er val to 10 ye ar s. Code Ca se OMN-26 est abli shes a str uct ure d r isk-inf orm ed appr oac h for de te rmi ning i nser vic e inte rva ls that pr ovide s an ac ce ptabl e leve l of qual ity and saf et y while pr oviding NSP M a dditiona l inse rvic e te st sche dule f lexi bilit y
Fu ll Desc rip t ion of Prop osed Alt e rn ative NS PM propos es to i mple ment OMN-26 al ter na tive r isk and mar gin inf orme d r ule s for i nser vic e tes ting of MOVs in its enti re ty at MNGP a s de sc ri bed below:
Pr opose d Alt er nat ive t o III-3310( c)
The m axim um i nser vic e tes t int er val sha ll not e xce e d 10 yea rs unle ss R isk Inf or med Ins er vice Te sting unde r the al ter na tive pr ovisions of Code Case OMN-26 t o pa ra. II I-3700. MOV inse r vice t ests c onducte d pe r pa ra. I II-3400 ma y be use d t o sa tisf y t his re quir eme nt.
Pr opose d Alt er nat ive t o III-3700
Risk-inf orm ed MOV inse rvic e te sting tha t i ncor pora te s r isk insight s in conj uncti on with MOV Func tiona l Mar gin to e sta blish MOV gr ouping, ac ce ptanc e c rit er ia, exe rc ising r equir em ents a nd te st inte rva l may be impl eme nte d.
Pr opose d Alt er nat ive t o III-3721
HS SC MOVs sha ll be te ste d in ac cor da nce with par a. II I-3300 and exe rc ise d i n a cc orda nce wit h pa ra. I II-3600 while a pplying the f ollowing HS SC MOV R isk i nsights and limi tat ions.
a) HS SC MOVs that c an be oper at ed during pla nt ope r ati on sha ll be exe rc ise d qua r ter ly, unle ss the pote ntia l i ncr ea se in cor e dam age fr eque ncy ( CDF) a nd l ar ge ea r ly r el ea se ( LER )ass ocia te d with a longe r exe r cise i nter va l i s sma ll.
b) F or HSSC MOVs, the m axim um ins er vic e test int er val sha ll be est ablis hed in a cc or danc e with Ta ble 1 of OMN-26 as shown be low.
T abl e 1
HSS C MO V - M ar gin Base d Maxim um Inse rvi ce T est In t er vals
HSS C MOV Func tiona l Maxim um l nser vic e Test I f MOV is rout inel y(A) ope ra te d a t De sign Ma r gin(D) I nte rva l ( Yea r s) Ba sis Pr e ssure C onditions-Max lnse rvi ce Tes t I nte rva l (Ye ar s)(B)
Low ( < 5% ) 2 4 Me dium ( 5% a nd < 10%) 4 9 High ( 10% a nd < 20% ) 9 9 Ver y Hi gh ( 20%) 9 12
OMN-26 T able 1 Note s:
(A) Occ urs a t a pe ri odici ty no le ss f r eque nt t han once a r e fue lingoutage.
(B) To utiliz e the se inte r vals, t est str oke s a t or exc ee ding de sign basi s syst em condi tions must be in the appl ica ble sa fe ty func tion dir ec tion( s) and have no appli ca ble oper a ting experience, de gr ada tion, or di agnosti c test a nomal y with the pote ntia l for a dve rse i mpac t on MOV f unct ional mar gin or the c apa bilit y of the M OV to pe r for m its design bas isf unc tion.
(D) F or the pur pose of this code ca se, the MOV func tiona l mar gin limi ts a pply to t he As-Le ft MOV c ondition at the st ar t of the inser vic e te st i nter va l a nd i nclude a pplic abl e tes t unc er ta intie s and all owa nce f or se r vice-r e lat ed degr ada tion.
Pr opose d Alt er nat ive t o III-3722 (d )
For LSS C MOVs, the ma ximum inse rvic e te st inte rva l s hall be e sta bl ishe d in ac cor da nce with Tabl e 2 of OMN-26, as shown be low.
Tab le 2
LSS C M OV - Mar gin Base d Maxi mu m Inse r vice T est I nt er vals
LS SC MOV Func tiona l Mar gin(D) Ma ximum I nser vic e Test I f MOV i s r outine ly(A) oper at ed at Desi gn Int er val ( Ye a rs) B asi s P re ssur e Condit ions-Ma x lns er vice Te st Int er val ( Ye ar s)(B)
Low ( < 5% ) 4 9 Me dium ( 5% a nd < 10%) 9 12 High ( 10% a nd < 20% ) 12 12 Ver y Hi gh ( 20%) 12 16( c)
OMN-26 T able 2 Note s:
(A) Occ urs a t a pe ri odici ty no le ss f r eque nt t han once a r e fue lingoutage.
(B) To utiliz e the se inte r vals, t est str oke s a t or exc ee ding de sign basi s syst em condi tions must be in the appl ica ble sa fe ty func tion dir ec tion( s) and have no appli ca ble oper a ting experience, de gr ada tion, or di agnosti c test a nomal y with the pote ntia l for a dve rse i mpac t on MOV f unct ional mar gin or the c apa bilit y of the M OV to pe r for m its design bas isf unc tion.
(C) Oper a ting plant s tha t have a cqui re d the r e quisite t est da ta to sati sfy Appendix I II, par a gra phs I I I-3310( b) or I II-3722(c ) must c omple te onc e c ycle of coll ec ting diagnost ic te st da ta a t an exte nded te st i nter va l, mini mum 9 and ma ximum 12 ye ar s, be for e e xtendi ng the t est inte r val by e nginee ri ng e valua tion to the ma ximum 16-ye a r tes t i nter val.
(D) For the pur pose of t his c ode c ase, the MOV f unct ional ma rgi n li mits appl y to the As-Lef t M OV condit ion a t the sta rt of the i nser vic e te st inter va l a nd i nclude a pplic abl e tes t unc er ta intie s and all owa nce for se r vice-re la ted degr a dation.
De scr ip ti on of Basis f or Us e The r e queste d re lie f to adopt OMN-26 is i n li ne wi th t he cur re nt Joint Owne r s Gr oup ( JOG) MOV Pe ri odic Ver if ica tion ( PV) Test P rogr am imple ment ed at MNGP in r es ponse to NR C Ge ner ic Le tte r 96-05. B oth t he JOG MOV PV Pr ogr am and Code C ase OMN-26 pr ovide a Ri sk-Mar gin base d me thodology tha t e sta blishe s l imit ati ons f or ma ximum inse rvi ce te st inte rva ls for MOVs. C ode Ca se OMN-26 simply provi des a re asona ble e xtens ion of t his R isk-Inf or med philos ophy ba sed on the l essons le ar ne d a nd a cc umula ted MOV pe rf or manc e dat a gathe r ed duri ng MOV Pe rf or manc e Ver if ic ati on Tes ting. Appendi x I II a lone, isola te d f rom OMN-26, pr ovide s no suc h me thodology othe r than a ma ximum limit f or the inse r vice t est inte r val r ega rdl ess of Ri sk or Ma r gin.
The r e queste d allowe d m aximum ins er vice test int er vals a re m odest ext ensi ons with ma ny of the Low Risk MOVs e xtendi ng f rom 10 to 12 ye ar s ( 20% inc r ea se). This tes t int er val c hange c an be r ea dily adopte d wit h no loss of MOV per f orm anc e and/or saf et y syst em re lia bilit y pr ovided tha t no adve r se per f orm anc e tre nds ar e indic at ed. MNGP' s MOV Pe rf or manc e Tr ending Gover nanc e will ensur e that only MOV' s wi th good per f orm anc e histor y, high stabl e mar gins and no a dve rse di agnosti c tr ends woul d be c andi date s f or the OMN-26 ba se d inse r vice t est inte r val ext ensions.
The r e queste d Hi gh Ma rgi n Ma ximum inte rva l cha nges af f orde d by OMN-26 al ign with NSP M's de sir e to a dopt a divisiona l MOV out age t esti ng str a tegy tha t r e duce s the i mple ment ati on bur den of MOV lnse r vice Te sting and al lows gr ea te r f lexi bility in optimi zing saf et y syst em ava ila bilit y. The cur re nt six and ten-ye ar JOG P rogr a m ba se d High-Mar gin Maxi mum Inte r vals do not suppor t this stra te gy.
The r e queste d re lie f r educ es the ma ximum te st i nter va l f or HSS C MOVs a llowed by Appe ndix I I I fr om te n ye ar s t o nine ye ar s comme nsur at e wi th R isk I nf orm ed Met hodology. Fur the r under t his r e lie f re que st, NSP M will tr e at MNGP MOVs cur r ently c lass ifi ed as Medi um R isk by the 3-Tier JOG Risk Ra nking as HS SC the r eby provi ding mor e r igor ous pe ri odic ver if ic at ion r equi re me nts f or the applic a ble val ves espe ci all y those wit h le ss than high mar gin.
The r e queste d re lie f ta kes cr edi t f or r outine de sign basi s dif f er ent ial pr ess ure te sti ng ( DB DPT) of MOVs to jus tif y e xtendi ng the maxim um I nse rvi ce te st inte rva l to 12 Yea rs f or Ver y High Mar gin HSSC MOVs and 16 ye ar s f or Ve ry Hi gh Ma r gin LS SC MOVs.
With the e xce ption of Low Ri sk MOVs routi nely oper a ted at de sign ba sis dif fe r enti al pr essur e ( D-P ) condit ions, Code C ase OMN-26 doe s not a llow maxi mum MOV Inse r vice Te st inte rva ls to e xce e d te n ye ar s unles s the a ssoc iat ed MOVs a re c la ssif ied as High Ma rgin or Ver y High Mar gin. Most Hi gh Ri sk MOVs ar e limi ted to four ye ar s or le ss f or Low/Me dium Mar gins and most Low Ri sk MOVs a r e limit ed to ni ne yea rs or le ss for Low/Me dium Margins. Code C ase OMN-26 pr ovide s mor e r igor ous r equi re me nts t ar get ed spec if ica lly to Low/Me dium Mar gin MOVs tha n c urr e ntly all owe d unde r Appendi x I II. This Risk/ Mar gin appr oac h i s in line wit h a cc epte d Risk-Inf orm ed Str a tegi es such as the JOG M OV PV Pr ogram.
For the m ajor ity of a pplic able MOVs (i.e., those M OVs not s ubjec t to pe ri odic str oking under de sign basi s D-P condit ions), the Code Case limit ed the sc ope to onl y High Mar gin Va lve s f or e xtendi ng te st inte rva ls incr e ment all y be yond c urr ent li mits:
Te st inte rva ls for Hi gh Ri sk MOVs go f rom six to nine yea r s Te st inte rva ls for Low Risk MOVs go fr om ten to twelve ye ar s (Note : Twel ve yea rs is al igned for all Boi ling Wa ter Rea c tor nuc le ar powe r pla nts (B WRs ) wi th e ithe r 18-or 24-month r e fue ling cyc le s).
The Ta ble be low pr ovide s a de tai led com par ison of the Ma ximum MOV Te st I nte rva ls for the JOG MOV P rogr am, Manda tor y Appe ndix II I a nd Code C ase OMN-26 tha t NS PM se eks to adopt at MNGP via this r eli ef r eque st. MOVs ide ntif ie d with Bol d an d Un de rli ne type ha ve ma ximum MOV inse r vice t est inte r vals e xce eding the c urr e nt Appe ndix I I I ten-ye ar l imit.
T able 3
MNGP Maxim um MOV Tes t Int er vals Base d on Code Case OM N-26 OMN-26 T able 3 Note s:
(A) Code C ase Ma ximum I nser vic e Test I nter va ls for a ll Low/ Medi um Ma r gin MOVs ar e le ss tha n or equa l t o c urr e nt t en-yea r Appendix I II limit. (i. e., Code C ase i s mor e c onser va tive tha n Appe ndix I I I for Low/M edium Ma rgi n MOVs).
(B) Code Cas e Maxim um I nse rvi ce Te st I nte rva ls for Low/M edium Ma rgi n HSS C MOVs ar e e qual to the cur r ent JOG MOV P V P rogr am limit s of t wo/ four ye ar s re spe cti vely. (C ode Ca se inte rva ls ar e a ligne d with JOG MOV).
(C) Code Cas e Maxim um I nse rvi ce Te st I nte rva ls for Low/M edium Ma rgi n LSS C MOVs ( four /nine ye ar s) a r e les s tha n t he cur re nt JOG MOV PV P rogr a m Lim its of six/t en yea rs r espe ct ively.
(D) The foll owi ng f our ca te gori es of MOVs ha ve ma ximum inse rvic e te st inte rva ls that e xce ed the cur r ent te n-ye a r limi t:
- b. Ve ry High M ar gin, HSS C MOVs tha t a re pe r iodic all y str oke d a t de sign basi s DP c onditions (DB DP T) (12 ye ar s)
(E) Exce pt f or Low Ma r gin HS SC MOVs, the Ma ximum MOV I nser vic e Test I nter val s a r e optimiz ed f or Divisiona l Out age S che duling (i. e.,
4, 9, 12, 16 ye ar s). Twelve ye a rs is optima l for bot h BW Rs and suppor ts both 18-month and 24-m onth r e fue ling outage s.
(F ) To utili ze the se inte r vals, test str oke s a t or exc ee ding design bas is sys tem c onditions must occ ur a t a pe r iodic ity no le ss f r eque nt than once a re fue ling cyc le, must be in the appl ica ble sa fe ty func tion dir ec tion( s), and the MOV must ha ve no a pplic able ope r ati ng e xper ie nce,
de gr ada tion or dia gnostic te st anom aly with t he pote nt ial f or a dver se impa ct on MOV func tiona l mar gin or the c apa bilit y of t he MOV to pe r for m its desi gn ba sis func tion. These r outine s troke s during the ins er vice test int er val a re not r equir e d to be dia gnostic all y moni tore d.
(G) Ope r ati ng pla nts that ha ve ac quir ed the r equisi te te st da ta t o sa tisf y Appe ndix I I I, pa r agr aphs I II-3310( b) or I I I-3722( c) m ust c omple te one cyc le of c olle cting dia gnostic t est dat a at an e xtende d t est inte r val, m inimum 9 a nd m axim um 12 yea r s, bef ore exte nding the te st i nter va l by engine er ing eva lua tion t o the m axim um 16-ye ar te st inte rva l.
(H) The MOV func tiona l mar gin limi ts a pply to t he As-Le ft MOV c ondition at the st ar t of the inse rvi ce te st inte rva l and inc ludes appl ica ble test unc er ta intie s a nd a llowa nce f or se rvi ce-r e lat ed degr ada tion. The inse rvic e te st inte rva l i s uni quely est abli shed for ea ch MOV bas ed on mar gin and ri sk c las sif ica tion of the MOV.
De scr ib e Hard shi p or Un us ual Di ff ic ult y NOT AP PLI CABLE
An y Add it ional In for m ation ( su bm ission at t ach me nt s list ed h er e)
NOT US ED (No Atta chme nts)
Pr ec e de nt s H. B Robinson Ste a m Ele ct ri c Pla nt, Unit 2 âSER f or Pr opose d Alte rna tive R eque st IS T-R R-9 Re ga rding the S ixth 10-Ye ar I nte rva l Inse rvi ce Te sting Pr ogra m, da te d Novem ber 4, 2021 (ADAMS Acc essi on Numbe r ML21259A099). B ra idwood Units 1 and 2, Cal ver t Clif f s Unit s 1 and 2, Cli nton P ower S tat ion, RE Gi nna, Lime r ick Gene ra ting St ati on Units 1 a nd 2, Nine M ile Poi nt Unit s 1 and 2, Pe ac h B ottom Unit s 2 and 3 -SER for Pr oposed Alte rna tive to Utili ze Code C ase OMN-26, dat ed Se ptem ber 1, 2020 (ADAMS Acc essi on Numbe r ML20232A171).
Re fe r en ce s