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)

Text

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1 S3-1 ROCHESTER 'G 'S nNO "'.EC>RlC C~.cPCRpl> lO><

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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 w wO eva --te oy *~we perse-.:.eL.

Cne 15 cngie&.-~

-.d catim;;~

pre 'we=

y ev-> -- 's c=-cceotmle '~ -~

"ther e.=-.-'-iat='cn

.d ev ruat"H e~'"

an

'~s

~ c cai"cn Ives not cerected i. >:a ~5 she<<

WaVe e~=-'="-tion Cn y t'"..e 15'ong

~Z3. ='vaVe CB~~cted 0:

~

id"C=t Cii.

On Y2 ch ~>

1 7, a~i 2.~Q:""t:.u~l i.

~wu t.;e vesse'a L'sL.= 0 ong t"n'>ave, 45'nd 60 ang>e be=--

she<<

'..ave ~~~-:-zticn oz

~-.e "3" w et nozz'2 was pe:

ed.

The "2.<ew of ~ms c""- did rot reve="l anv

.Qicat='cns.

'I /l<<

..ere.ore, cn i~'- "". o, i><9 a 2

. ~.

Cn oz

.e

.c ""-

.. -"e pe =-=;..

=m

~=.e Do'=

="or u-- "='.=- a 1>

ang

=2=-.,

cngi=m "~

..-2 e~'"-"-'"a "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:...

I in at"ac'".ed

= p~-2 i) icent='==ed ov t'.eir =~@'.a aw '= "e i.. C r:'ers 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 t~ gaea of the nozz e with gcod corellation to the LT evaluation.

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 oot GQ "o es (-"-..) '

t..e..

to vesseL c- '

rat-cn

~&et7&-5P.p

l

~

~

t s

li'

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 vesse'all do noc decec"

~~'s rl=-

'".dicac" cn.

m~" ed cn

~-.e ezc~sive evaiuaticn of w~s e~ ec o bv severPl Level IIiult as%a "c BF~~~~=t:cn soec P iscs we a 2 ve j M K enc that L 2 s3 ~1 s cose veQ arB CUB to K c BDDBQ slaR ooseneo

~~ the==-br=cat~on raoz.ograp."a ano no sz.~ -.chic

=~~--~ ewsc z~

'this "Blo Rile 1 ce "c

~c3 i s sKs'c 'l inte~" j or sc c -D T.

We PaDB t".'s i:cation

~i.

cs your ne

s. if 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::

Welding and '.fences= ""'ve Ezc Qz t cn "~p

.Ber

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