ML17261A813

Discusses Exam of Plant Reactor Pressure Vessel B Inlet Nozzle to Vessel Weld Indication.One 15 Degree Longitudinal Indication Preliminarily Evaluated Unacceptable.Exams Showed Signals Due to Entrapped Slag W/No Serious Flaws in Weld

ML17261A813
Person / Time
Site:	Ginna
Issue date:	03/11/1979
From:	Curtis A ROCHESTER GAS & ELECTRIC CORP.
To:	Wambach T NRC
Shared Package
ML17261A806	List: ML17261A805 ML17261A813 ML17261A814 ML17309A414 ML17309A416 ML17309A417
References
NUDOCS 8901130176
Download: ML17261A813 (10)

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1 ROCHESTER 'G 'S nNO "'.EC>RlC C~.cPCRpl> lO>< ~ 09 =AS> A'>> HUE, RCC.""ES:"="2, > l.".. l '5~y

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Ginna Station.

March 11, 1979

Subject:

Girrw Reactor P-essure Vessel "B" L&et Nozzle to Vessel Veld Indicaticn To: Tan V~ach - Nccl~ Regulatory Can~sion On Febv -~z 27 1979 t"..e "8" alee nozz'e oz" ""ie Gim Re=-c""" Vessel ewer.ed =w t".e rsozzle bo=e ..-'-4 15'cng~~l l'ave 2nd >'-5'hm:.<ve in acco ance wi .~zoe~ai>' of .Sec""'on

~ C. Cn 'Ywch 3, 1.79 tie & a was eva --te oy *~we perse-.:.eL. cngie&.-~ -.d catim;;~

pre 'we= y ev->

-- 's Cne 15 w wO c=-cceotmle '~ -~ "ther e.=-.-'-iat='cn .d ev ruat"H e~'" an WaVe e~=-'="-tion Cn y

'~s ~ c cai"cn Ives not cerected t'"..e 15'ong ~Z3. ='vaVe CB~~cted 0:

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On Y2 ch ~> 1 7, a~i 2.~Q:""t:.u~l i. ~wu t.;e vesse'a 45'nd 60 ang>e be=-- she<< '..ave ~~~-:-zticn oz ~-.e "3" L'sL .= 0 ong w et nozz'2 t"n'>ave, was pe: ed. The "2.<ew of ~ms c""- did rot reve="l anv .Qicat='cns.

..ere.ore, cn i~'- "". o, 'Ii><9 /l<<

a 2 ~.

. Cn oz .e .c ""- .. -"e e~'"-"-'"a=m pe =-=;..

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~=.e Do'= ="or u-- "='.=- a 1> ang =2=-., cngi=m "~ ..-2 "e e. '-- c"-s- -" d cz s-'- c-'" -"a ="--'='c=-s ~ o-whic'.". rec'rdec 0% D~C 2nd ~cate ~~ii- ce s'=->ls . o ~~ (as she:...

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in = p~-2 i) icent='==ed ov t'.eir =~@'.a aw '= "e C r:' ers at"ac'".ed I as 61, 55, 53, 102, 89 and 1;7. The indicaticn was ~~e~ rea~~~ed -~~~". 6~

awa> sea>, 2 oz Aiica re "r=ec 507. DAC wd c cate ~li="'es in 6 a==-s ide~ti"ied bv ~'".~='r n~z-..=. ~mlitt "e % L'~C n=.iers as -', 59, 58, 89', 76 and 115. These indic"-t<<cns c=zine into 3 incicat='ons 1. inc;.es mart at the'- ne"-~est poi. ts. This c ..ension is greate<< t'.".~a the 0.93 inch ~ "o."-a wall diL.e-lions oz the larger incic"-ticn so they are ccnsi 2 ed as separate indications in accordance ~v":"a the m~es oz Section Xi. T.".e 2 siial indicatic.a have "a" and "l" d~we~sicns Rich are clear'y al>lowable ader the ries of Sect" on ZE 197<, Table IBM-3510. 7".e larger indication 'res m "a" oz .W5 inches, "l" oz 5.271 inches and "t" is 9 ~~ches r~~

cons der3. ~< t.le r~d,eclat- cn data wltDout tzEQzlg, &~to ac~~it bca:il spread, so a/1 = .05, .a = 5.17/ oz t.~M.ch ezceeds the code allowable liwts. 7..e rev-e~ oz" the fabricat'on accept-ace radiogra hs shcws t'.m slag indications (code acceptable) in corellation to the LT evaluation.

t~ gaea of the nozz e with gcod In order to get hze ac -ate siz'~g of this larger indication ben spre "-

sureÃe .ts we e tak= C. L. T/2 2nd 3/> T 3/8 'c'. c.'.ete side c='~ ec hol~s, ~vwch ~ives a bem soread a'.a'e of 1/2 ce"rees as 2 ~ . aH" .>a>>ants cn 3/1 6 '.Cn =-ic 3/8 ~.cn ci~~i.eter ang-'0 ~=L-ec.:z-'-"i

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~&et7 &-5P.p oot GQ "o es (-"-..) ' t..e ' to vesseL c- ' rat-cn

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Tan Wavhach Narch 11, 1979 Sheet 2 of 2 indicaticn's metal path gave mplitudes of 50% and 112% DAC respecc'vely frcm a s~dard DAC calibracicn utilizing the sm:e search mit and wedge that vere used for the e~inations. The 50% DAC m~~rerancs cn the 3/8 inch FBH g'ves a bema 'spread angle of 6 1/2 deme s in the projection direction md 8 degre s across the bern. Sizing the 3/8 inch dimeter rnH to the 50% DAC limits gives 63/60 incnes by I 1/8 inches dir~sicns oversizing the reflector by .609 inches in the projection d~ "eccicn and

.750 inches across the bean. Reflectors giving similar @rod.t oes at similar natal pat~s ~&eh are sized to the 50% DAC l~ts -~y be Bmected to be similarly ove sized. Bem spread cor"ect" on of the subsurface indication dizensicns as si:r~z in Fibre 2 gives a length ""c" of 4.521 inches, "ac" of .1603 inches, "t" = 9 inches, a /lc = .035, ac = 1.78% o t, which c~~mst"ates "'.at >"~ indicat=on is allovmle unce ~ae ru es of Secticn 0 1974, Table iviB-35'i0. The indication 's locaced ne>> "'".e rozz 2 forging to weld '.tenace of the nozzle to vessel weld as sa Qvtl in "i@~ e

3. it is detected bv t'.".e 15'ngle bee longiv.~ill wave e~~~'~~~ion =~~

the nozzle bore. ~e ~5 ~~ole bern sne>> wave ~m the nczz~e bore, t. e 0'cngi- d'~"l, ~I.S'he"-- and 60'neer wave e~~"actions ==. ~".e do noc decec" ~~'s rl=- '".dicac" cn. m~" ed cn ~-.e ezc~sive evaiuaticn vesse'all of w~s e~ ec o bv severPl Level IIi ult as%a "c BF~~~~=t:cn soec P iscs j M K enc that L 2 s3 ~1 s cose veQ arB CUB to K c BDDBQ slaR we a 2 ve

'this "Blo Rile 1 ce "c ~c3 s sKs'c t".'s i:cation

'l if ooseneo ~~ the ==-br=cat~on raoz.ograp."a ano no sz.~ -.chic =~~--~ ewsc z~

i j inte~" or sc c -D T.

We PaDB ~i. cs your ne s. you have any ~ "-~B aues"=cns c~ce '~"- ~"'s ='"."ic~cicn, D Base co noc nesita=e co contact m We 2"2 Drcceedi."-;.-i=a ct~~ start-up sc'".e~ le ano ~v ld st" I be wi I'~~ co disc ss t='w 8 --'".~ .~ith ycu ac ycu ccnveaenc .

Sincerely, Albe c E. C ""'s i::""'ve Welding and '.fences=

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