ML063310175

Palisades, Request for Additional Information, Related to the Proposed C* License Amendment Request for Steam Generator Tube Repair in the Tubesheet

ML063310175
Person / Time
Site:	Palisades
Issue date:	12/15/2006
From:	Chawla M L NRC/NRR/DLPM
To:	Harden P A Nuclear Management Co
L. Mark Padovan, LPL3-1
References
TAC MD2125
Download: ML063310175 (6)

Text

De cembe r 15 , 20 06 M r. P aul A. H arde n Si te V ic e P resi den t Nu cl ear M ana gement C ompa ny , LL C Pa li sad es Nu cl ear Pl ant 277 80 Bl ue Sta r M emori al H ighw ay Co v ert, M I 4 904 3-95 30 S U B JE C T:

P A L IS A D E S P L A N T - R E QU E S T F OR A D D ITIO N A L I N F OR M A TION R E L A TE D TO TH E P R OP OS E D C* L IC E N S E A M E N D M E N T R E QU E S T F OR STEA M GEN ER ATOR TUB E RE PA IR IN THE TUBE SH EE T (TAC N O. M D2 125)De ar M r. H arde n: Yo ur l etter of M ay 30 , 20 06, sub mitted an ap pl ic ati on to c han ge the P al is ade s N ucl ear Pl ant (Palisades) tec hnical specif ications r elated t o steam gen erat or tu be repair. Th e chang es w ould re v i se t h e r e p a i r cr i te ri a for t h e p o rt i o n o f th e t u b e s w i th i n t h e h o t-l e g re gi o n o f th e t u b e sh e e t.W e a re re v ie w in g y our requests , an d fin d th at a ddi tio nal i nformatio n i s n eed ed as sho w n i n th e e n cl o se d r e que st for a d d i ti o n a l i n form a ti o n (R A I). I d i sc u ss e d t h e e n cl o se d R A I w i th M s. A my Ha z el hoff of y our organi z ati on on De cembe r 13 , 20 06, and sh e a greed to re spo nd w ith in 60 day s o f rec ei pt o f thi s R AI. P le ase co ntac t me at (3 01) 415-142 3 i f y ou hav e que sti ons.

Sin ce r ely,/RA/

M ahe sh L. C haw la , P roject M ana ger P ro je ct D i re ct o ra te I II D i v i si o n o f Li ce n si n g P ro je ct M a n a gem e n t Of f ic e o f N ucl ear Re acto r R egul ati on Do cket No. 50-255 E n cl o su re: RAI c c w/e n c l: S e e n e x t p a ge M r. P aul A. H arde n De cembe r 15 , 20 06 Si te V ic e P resi den t Nu cl ear M ana gement C ompa ny , LL C Pa li sad es Nu cl ear Pl ant 277 80 Bl ue Sta r M emori al H ighw ay Co v ert, M I 4 904 3-95 30 S U B JE C T:

P A L IS A D E S P L A N T - R E QU E S T F OR A D D ITIO N A L I N F OR M A TION R E L A TE D TO TH E P R OP OS E D C* L IC E N S E A M E N D M E N T R E QU E S T F OR STEA M GEN ER ATOR TUB E RE PA IR IN THE TUBE SH EE T (TAC N O. M D2 125)De ar M r. H arde n: Yo ur l etter of M ay 30 , 20 06, sub mitted an ap pl ic ati on to c han ge the P al is ade s N ucl ear Pl ant (Palisades) tec hnical specif ications r elated t o steam gen erat or tu be repair. Th e chang es w ould re v i se t h e r e p a i r cr i te ri a for t h e p o rt i o n o f th e t u b e s w i th i n t h e h o t-l e g re gi o n o f th e t u b e sh e e t.W e a re re v ie w in g y our requests , an d fin d th at a ddi tio nal i nformatio n i s n eed ed as sho w n i n th e e n cl o se d r e que st for a d d i ti o n a l i n form a ti o n (R A I). I d i sc u ss e d t h e e n cl o se d R A I w i th M s. A my Ha z el hoff of y our organi z ati on on De cembe r 13 , 20 06, and sh e a greed to re spo nd w ith in 60 day s o f rec ei pt o f thi s R AI. P le ase co ntac t me at (3 01) 415-142 3 i f y ou hav e que sti ons.

Sin ce r ely,/RA/

M ahe sh L. C haw la , P roject M ana ger P ro je ct D i re ct o ra te I II D i v i si o n o f Li ce n si n g P ro je ct M a n a gem e n t Of f ic e o f N ucl ear Re acto r R egul ati on Do cket No. 50-255 E n cl o su re: RAI c c w/e n c l: S e e n e x t p a ge D IS TR IB U TION PU BL IC Ri dsOgcRp Ri dsN rrDo rlL pl 3-1 Ri dsN rrDo rlD prRidsRg n3M ailCenter LPL3-1 r/f RidsAcrs AcnwM ailCenter RidsNrr PM M Chaw la Ri dsN rrLA THarri s GM akar AD AM S Acc ess io n N umbe r: M L06 331 017 5 OF FICE LPL3-1/PM LPL3-1/LA LPL3-1/BC NA M E M Ch aw la THarri s LR aghav an DA TE 12/1 5/06 12/1 5/06 12/1 5/06OF FICI AL RECORD COPY Pa li sad es Pl ant cc: Ro bert A. Fen ech , S eni or V ic e P resi den t Nu cl ear, Fos si l, and H y dro Operati ons Co nsu mers E nergy C ompa ny 194 5 P arna ll R d.Jac kson, M I 4 920 1 A ru n a s T. U d ry s, E squ i re Co nsu mers E nergy C ompa ny 1 En er g y Plaza Jac kson, M I 4 920 1 R e gi o n a l A d mi n i st ra to r, R e gi o n I II U.S. N ucl ear Re gula tory C ommis si on Su ite 21 0 244 3 W arren v il le R oad Li sl e, IL 605 32-4 351 Su perv is or Covert T ow nship P. O. Bo x 35 Co v ert, M I 4 904 3 Of f ic e o f the Gov erno r P. O. Bo x 30 013 Lan si ng, M I 4 890 9 U.S. N ucl ear Re gula tory C ommis si on Re si den t Ins pec tor's Of f ic e Pa li sad es Pl ant 277 82 Bl ue Sta r M emori al H ighw ay Co v ert, M I 4 904 3 M i ch i gan D e p a rt me n t o f E n v i ro n me n ta l Qu a l i ty W aste an d H az ardo us M ateri al s D iv is io n Ha z ardo us W aste an d R adi ol ogica l Pro tecti on Se cti on Nuclear Facilities Unit C o n st i tu ti o n H a l l , L o w e r-L e v e l N o rt h 525 W est Al le gan S treet P.O. B ox 30 241 Lan si ng, M I 4 890 9-77 41 M ic hi gan D epa rtment o f A ttorne y Gen eral Sp eci al Li tigati on Di v is io n 5 2 5 W e st Ot ta w a S t.Si x th F lo or, G. M enn en W il li ams B ui ld in g Lan si ng, M I 4 891 3 M ic hae l B. Se ll man Pre si den t an d C hi ef Ex ecu tiv e Off ic er Nu cl ear M ana gement C ompa ny , LL C 700 F irs t S treet Hu dso n, M I 5 401 6 Jo n a th a n R o goff, E squ i re V i ce P re si d e n t, C o u n se l & S e cr e ta ry Nu cl ear M ana gement C ompa ny , LL C 700 F irs t S treet Hu dso n, W I 5 401 6 Do ugla s E. C oop er Se ni or V ic e P resi den t an d Ch ie f N ucl ear Of f ic er Nu cl ear M ana gement C ompa ny , LL C 700 F irs t S treet Hu dso n, W I 5 401 6 Ste phe n T. W aw ro, D ire ctor o f N u cl e a r A ss e ts Co nsu mers E nergy C ompa ny Pa li sad es Nu cl ear Pl ant 277 80 Bl ue Sta r M emori al H ighw ay Co v ert, M I 4 904 3 Lau rie A. La hti , M ana ger R e gul a to ry A ff a i rs Nu cl ear M ana gement C ompa ny , LL C Pa li sad es Nu cl ear Pl ant 277 80 Bl ue Sta r M emori al H ighw ay Co v ert, M I 4 904 3 ENCLOSURE R E QU E S T F OR A D D ITIO N A L I N F OR M A TION (R A I)L IC E N S E A M E N D M E N T R E QU E S T F OR R E V IS E D S TE A M GE N E R A TOR REPAIR CRIT ERIA (C* CRIT ERIA) PALISADES NUCLEAR PLANT NU CL EA R M AN AGEM EN T COM PA NY , LL C DOCK ET N O. 50-2 55 1.

The p ropo sed ame ndme nt i s i nten ded to al lo w tub es w ith flaw s to rema in i n s erv ic e i f the f law s are locat ed below a certa in depth in the hot-leg reg ion of the tube sheet. Th is w ill requi re p ropo si ng an al terna tiv e to the 40-perc ent, throu gh-w al l dep th c rite ria i n th e P a l i sa d e s' Te ch n i ca l S p e ci fic a ti o n s (TS s). P l e a se d i sc u ss y o u r p l a n s to r e v i se TS 5.5.8.c as f ol lo w s:A.

Ind ic ate there i s a n a lte rnati v e to the 40-perc ent repa ir cri teri a.B.

D efine the rep ai r cri teri a i n th e h ot-l eg tub esh eet regio n (i.e., d epth be lo w w hi ch f la w s ma y r e ma i n i n s e rv i ce , a n d t h e s ta rt i n g p o i n t for th e d e p th me a su re me n t).C.

D efine the rep ai r cri teri a for th e re gion of the ho t-le g tube she et i n w hi ch nei ther the al terna te re pai r cri teri a n or th e 4 0-pe rcen t thro ugh-w al l cri teri a a ppl y (i.e., tu bes w ith fla w s w i th i n t h e C* d i st a n ce w i l l b e p l u gged o n d e te ct i o n).D.

S tate that al l f la w s l oca ted bel ow thi s d epth may rema in i n s erv ic e, re gardl ess of si z e.2.

Pro pos ed TS 5.5.8.d defin es the porti on of tube that must b e i nsp ecte d, "from 12

.5 i nch es bel ow the tub e-to-tu bes hee t ex pan si on trans iti on in le t to the tube-to-tub esh eet w el d a t the tube ou tle t . . . ." Si nce the C* cri teri a i s a n a lte rnate rep ai r cri teri a ra ther than an in s p e c t io n cr it e r ia , it do e s no t ch a n g e t h e ob j e c t iv e in t h e cu r r e n t T S 5.5.8.d t o de t e c t f la ws f rom the inlet tube-to-tube sheet w eld to the out let tube-t o-t ubeshe et wel d. If the C* crit eria is pro perl y de f in ed as an al terna te re pai r cri teri a (a s d is cus sed i n #1 a bov e), th en in spe cti on bel ow the C* d is tanc e i n th e h ot-l eg regio n w oul d n o l onger be requi red bec aus e o f th e p h ra se , ". . . a n d t h a t ma y s a ti sfy t h e a p p l i ca b l e t u b e r e p a i r cr i te ri a" i n TS 5.5.8.d. Please discuss your plans to m odif y prop osed T S 5.5.8.d t o rem ove the r ef eren ce to th e C*di stan ce and res tore the w ordi ng ap prov ed in the Tech ni cal S pec ifica tio ns Task Force 44 9 amen dmen t (i.e., ". . . from the tub e-to-tu bes hee t w el d a t the tub e i nl et to the tub e-to-tube she et w el d a t the tub e o utl et, a nd that may sa tis f y. . . ."). In ad di tio n, th e s taff no tes that the 12.5-in ch C* di stan ce is mea sure d from the top of the tub esh eee t or the botto m of th e e x p a n si o n t ra n si ti o n , w h i ch e v e r i s l o w e r.3.

The b asi c p remi se of the C* amen dmen t i s th at th ere is a 12.5-in ch, non-f la w ed porti on of the tube full y ex pan ded i nto the tube she et. To en sure the regi on remai ns f ree of f la w s, a n inspect ion of 100 percent of the inservice tubes in the upper reg ion of the tube sheet w ill n e e d t o b e p e r fo r me d e v e r y 2 4 e ffe c t i v e fu l l-p o w e r m o n t h s , o r o n e r e fu e l i n g o u t a ge in terv al , w hi che v er i s l ess. A s a res ul t, pl eas e d is cus s y our pl ans to rev is e y our prop ose d TS 5.5.8.d to a dd thi s i nsp ecti on requi rement (e.g., by ad di ng a para graph 5.5.8.d.4). The sta f f notes t hat if an additional parag raph 5.5.8.d.4 is added, it w ill need to be ref eren ced in 5.5.8.d (i.e., "In a d d i ti o n t o me e ti n g th e r e qui re me n ts o f d.1 , d.2 , d.3 , a n d d.4 b e l o w . . . .").4.

Pl eas e c onfirm th at s tructu ral an d l eakage i ntegri ty w il l be ass ess ed if si gnifica nt in di cati ons are found w ith in the i nsp ecte d re gion of the tub esh eet. The staff rec ogni z es that the cur rent approac h of plugg ing f law s on detect ion w ithin the C* distan ce should p r o vi d e a h ig h le ve l o f co n f id e n c e t h a t no po t e n t ia l l e a k in g or st r u c t u r a ll y s ig n if ic a n t f la ws ar e id en t if ied in t his re g ion. Ho wever , su ch an a pp r oa ch ca n no t ens ur e it w it h c er t ain t y.5.

The c al cul ati on of the in spe cti on di stan ce f or th e h ot-l eg tub esh eet regio n u sed the l ow er 95-p erce nt p redi cti on bou nd f or th e me asu red and pro jected smoo th-bo re, "first-sl ip"pul lo ut v al ues pl otted i n F igure 3 of Enc lo sure 4 to y our M ay 30 , 20 06, le tter. As di scu sse d in the R AI resp ons es to p rev io us C* rev ie w s (i.e., S ecti on 2.1.4 i n E ncl osu re 6 of y our M ay 30, 200 6, l etter), use of the l oad at "f irs t sl ip" as sumes tha t the "first mo v e" re sul ts from gri p p e r sl i p p a ge o r o th e r mo v e me n t b e si d e s mo v e me n t o f th e t u b e w i th i n t h e t u b e sh e e t. Si nce thi s a ssu mpti on abo ut th e "first mov e" w as not v eri f ie d, a nd giv en that al l tube s sho ul d re si st p ul lo ut from the tub esh eet, con f irm that if the force-pe r-uni t-le ngth for the most l imi tin g spec ime n, b ase d o n l oad at "f irs t mov e," w ere use d to de termin e th e re quire d le ngth o f ex pan ded tub ed nee ded to resi st p ul lo ut, th is l ength w oul d s til l be le ss than the p ro p o se d i n sp e ct i o n d i st a n ce (1 2.5 i n ch e s). T he staf f notes t hat in Section 2.

4.3 of Enclosure 6 (which addresse s the f irst-slip crit eria f or s mooth-b ore sampl es), the f in al tw o p aragraph s e x pl ai n th at e v en if the re w ere no ex pl ans io n re si dua l con tact pres sure be tw een a tube an d tu bes hee t i n th e P al is ade s s team genera tors, a l ength of 6.75 in che s i s e nou gh to resi st th e th ree-ti mes n ormal op erati ng di f f eren tia l pres sure. The di scu ssi on id enti f ie s d iff eren tia l thermal ex pan si on and e x p a n si o n fro m t h e t u b e i n te rn a l p re ss u re a s th e s o u rc e s o f th e r e si st a n ce t o t u b e p u l l o u t. Al thou gh thi s w as referred to as the "most ex treme c ase ," i t i s n ot c le ar i f the eff ect of tube she et b ow w as in cl ude d. Pl eas e d is cus s w heth er y our ev al uati on con si dere d th e e f f e c t of t u b e s h e e t bo w.6.

For the Ri nghal s te st d ata, the f irs t-sl ip pu ll out v al ues pl otted i n F igure 3 of Enc lo sure 4 w ere proje cted from the measu red, max imu m-lo ad v al ues. P le ase di scu ss the eff ect on Fi gure 3 an d y our le akage an al y ses i f a con serv ati v e b oun d (i.e., 9 5-pe rcen t pre di cti on in terv al) w ere use d to pro ject th e first-s li p l oad v al ues for the R in ghal s d ata.7.

The s taff no tes that the page numb ers li sted on the co v er s hee ts o f E ncl osu res 2 a nd 3 (pages 5.5.8-11 and 5.5.8-12) do no t match the pa ge nu mbers on the botto m of the e n c l o s e d T S p a ge s (p a ge s 5.0-1 1 a n d 5.0-1 2). P l e a s e c l a r i fy w h i c h a r e t h e c o r r e c t p a ge numb ers f or th ese TS p ages. In a ddi tio n, th e s taff no tes that prop ose d TS page 5.0-1 2 sho ul d i den tify the "P rov is io ns f or S G tube i nsp ecti ons. (co nti nue d)" a s i tem "d" rathe r tha n i te m "e."8.

Accor ding to Section 2.

5 of Enclosure 4, the prop osed inspect ion distance of 12.5 inches is bas ed on add in g the 0.28-in ch non-des tructi v e e x ami nati on ax ia l-p osi tio n u nce rtai nty to the v a l u e s o f "J o i n t L e n gth t h a t M e e ts L e a kage C ri te ri a ," (1 2.2 4 a n d 1 2.2 5 i n ch e s). H o w e v e r, si nce 12.25 + 0.2 8 = 12.5 3, i t w oul d b e c ons erv ati v e to us e a v al ue of 12.6 in che s ra ther than 12.5 i nch es. P le ase di scu ss y our pl ans to modi f y y our prop osa l to u se 12.6 i nch es as the prop ose d d is tanc e for th e a lte rnate rep ai r cri teri a (a nd in spe cti on) in the ho t-le g region o f th e t u b e sh e e t.