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Site Problem Rept 444,on 730122:reactor Coolant Valve Steam Leak.Valve Had Excessive Travel & Yoke Bushing Threads Were Cut by Stem.During Replacement of Yoke Bushing,Steam Leaked Past Reactor Coolant Valve 3.Supporting Matl Encl
	ML19322A364
Person / Time
Site:	Oconee, Crane
Issue date:	03/16/1973
From:	Mcconnell R, Pittman R; BABCOCK & WILCOX CO.
To:	;
References
	TASK-TF, TASK-TMR 444, PROB-730316, NUDOCS 7910040547
	Download: ML19322A364 (45)
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M AE Catral 2r..si.neering Files M. 'J. De:u21 - Quality isaurarce DATE b D Q.3.WC_ouw_ -S.o.r/1. ci)

The sttachtu, cicarol SEh is sub;itted fer y:xzr infor=Atic:t.

To:

M. S. Ibbrey

4. Vard' W

G. E. F.alynych

/ T. Iselin - Ark.a=sss

/ J. McFarland

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[G.M. Olds T. Scho=er

[ 2. Verstas

.. B ir.ney - FI'* I-Attactoi is cne copy of Site P atleta Report, sa.

4 eJ 4 e ich has been processed on Cor.trnet 62C-DO _M T:x2r centract or ex.racte may have the ;ct ential ic,e a similar ;::blem. The Site Problem Reic:-t is being ferv.rded for your inferr.eti = ss.1 use : 7: event proble=.t fres recurring on folh vir.g con'.racts. A rcre c:=plete file es the probles

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1 PRIM ARY DOC'3EWTS:

SPEC NGS.

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ECulP C03E/LDEL/DATE DA LEVEL QA SPEC NO.

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DESCRIPil0F 0F FROBLEjl In addi*:. Ion to the problens described in Rev.1, the design of the back ceal does not sec=3 to he adequate. (refer to SPR h61).

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DESCRIPTION OF PROBLEE

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Valve has excessive travel and yoke btshinc threads vem cut by sten.

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Daring Replace =ent of yoke bushirg, stee= vas leaking past RC 3.

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Valve eculd not be packed without removal of operatcr sad ycke bushic6 m.

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STATUS ACTION TO DATE lhCLUDING PERSONS CONT ACTED, CCEMITIENTS NAGE, ETC.

See Attached Sheet ftHt%ER ACTION RfattitED BY 9TMtR-TitAtt SITE PERSChMEL Fochell to ir.s;ecT. valve cish, gj lb wa.=os4=e F1 disk nut, and sten to deter: sine reason for failt.re. Rockwell to bring Service engineer y

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Spline rear which c n:.eets stem to limitortue o;=erstor alsa ci rep 1sted. Valve placed bvk in I!rited cer.-ice until cor'pletf en of IC".

E-i.e. no* to be ueeJ exeert durinA. ecidern-E 2.

Action - Itspected valve inte-naio with Clinten L. S=rall (Cales 3eprecentative) of the Atlanta amlen office of hcAvall.

E Mr. Str. all teek vs1ve inter mis with hi: te ship to the Paleigh, NC

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plant for anc. lysis e.1 eyects to hsve sn a svt r/anstlysis for r aren of failure by 1/L/ U.

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SC,Rockvell Plsnt and a I.imiterque rap-enr.tative here on site on 1/8/73

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for RC-1 and RC-3 re. oval and inspectice.

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?'.r. Su.rnll said that this valve is desired to back seat to a limit E

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.ct a ter;ue switch, and tha' *' U # s set in the Fsleid Plan

prior to shipment. Fe agreed thst t% li-it switch alparently fa led or i

was improperly set.

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Upon inspaction of the ste= ?!r. SunrC' s tii that we probably had ^a bad sten, i.e. the flanged end Wich keeps '.ie sten attached to the disk and I

,g disk nut assenbly was too thin.

te sta= shculd te

3/S inches thich and appears to have been = 1/16 inch st nest.

During replacerient of ycke bushing by !?

hey fcund that the valve esnnet eE h

be repacked without re.evin6 the vain creater and ycke bushing.

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due to the size of the bonnet beirg se n.s'1 that tne gland sen and latern glsnd, when pulled taek for r.cMr_r prohihit the insertion cf y

facking belev the latern gland.

.!'.r. P_._. sill agraes that this is an

'gtilfactory design.and stated thnt 1:ci.cl1 hs.3 extended bonnets which vculd allev'ideking vfth c;erator in pine. He agreed to investinte the

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possibility of supplying these lerger Mr_-e s (this would si a r uuire a lenger ste :) ht, was not s,ure what the deliv ry 1sta vculd be cr who would I sy. Se c pito/. #3 W

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Mr. R. Burnley, 3 & W Engineerinr Indiester that the foll W.ng 23 k

y valves at this site *re of the Ice design. We ao not kn: which, Y

i f e;t, have the lo:.ger bonnet s-i vsh e s*en.

I B & W valve #'s for Oconee I, T, ir III.

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h RCV-1, 5 (2 1/2")

CFV-2A, 23, & 3A, 33 (l")

l' CAV-1, 2, 3, L4, LB, SA, 53 (l" or 1/2")

p EPV-1A, 1B, 2A, 23, 3 (2 1/2")

EPV-L. h3A, h33, L30, L33 (1 1/2**)

I HPV-12, 13, 2LA, 2L3 (h")

f Oconee I only (Westingnease Pu=ps) s i

I SIZE-

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(1")

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~ erection of n k th.a the falleving :

'<C

/

r. - Er d c f s * * : has serewed below dist 2t; f te stevs evidence of excessive ve-s.r at disk er.d S.- r 2 inches and is srke.'

n the entire lenth.

S*<.* f &o D'/

A Olck

.dtr. back seat (on dist nut) is heavily scored while sin neat rensins in ecod condition. The inner surface of the disk nut is heavily scored with esteritl depesited en it, possibly fr=: sten.

b estion: Sheuld the centack ares en the er.3 of the sten and the disk nut te of a Msring material *

.~nen the valve is back seated this area has f ree snd tvict splied v..' vill therefore, have a cutting action if limit switch fails.

2e disk nut tack veli vss drilled cut and the lisk & disk nut were inspected.

s.

The tette: cf the disk nut chevs eviden:e of wear on the inside diameter surface.

% p s 7s R

f b.

A bronze colorei -ing vaa found lese rier the disk nut. Thickness was

.017 *w.C30 4-"es Go (L. ls *)

MW Ur. der stem there is an aras which Muld te the stellite bearing pushed c.

and broken, or it eculd be the tettc= of the ste, = 1/32 of an inch thick.

'.'t.is pie e is p:shed inte s g.pe in the body of the disk

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4 Toke Eushing - Inner threads stripped out in a ecil s'en the unthreaded portion of the ste:.'s3 torqued threush the busting.

Junk ?.ing -

Cuter surfa e shows evidence cf galling and wear.

O

.m -

.m$Q_h RWSW.~h.kn b &+L_2.?+ 3.'j..':(N.;y:

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E uk sen* area nhown ex.~?ssive vesr as doca tack neat ama of disk

)

nut.

s311ne -

Connects valm. *m to c; crater - c!.evs evidence of excessive wear and hs3 r. hsir 11ne cract.

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-Pos riosa.i SI TE P ROBL EH REDO RT BABC0CK & I:LC01.NPC CUSTOMER Duke Per.rer cce twy CONTR ACT NO.620-c.m SPR NO. 4 44 SPR REY.HO. n g

VENCOR P.O. NO.

COMP.NO. 39 GROUP NO /O SEQ M C'I PRiulRY 00COWEidTS:

SPEC NOS.

DES ND.

EQUIP CODE / LEVEL /DATE CA LEVEL DA SPEC NO.

SITE ENGINEER EARLY START CATE iaCTUAL START DATE REQ'D C0lfP.CATE

3. J. Pe.ker

)

~

11TLE ( MAL 30 SPACESI RO - V1 Steam Leak DESCRIPil0N OF PRDELDI fee Attachment 4

2.

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r a

e o

ST ATUS-ACTION TO DATE INCLUDING PERSONS CONTACTED. CQuitTMENTS NADE. ETC.

5.

None e

FURTHER ACTICN REQUIRED BY OTHER THAN SITE PERSGMEL Yes, I nchburg F.cf'.aeering investigate to see i* a.ny da: age may have occured J

te the sm ny no rle.

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p SITE OPER.KGR.

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f MS SUPPORT ENCR.

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0'-

PROJECT MANAGER ci sm e n e

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Se TE OPS M AN AGER RESPON 35 0 t L I TY ASSIGN.

c' L eiwa ca.' '**

O Cl PROJ ECT MAN AGER 14. S. SUPPO RT ENGR, m en.sa ss,.,

en.

n I Z AW R.

OD4LP CONTRACTS AFFECTEC ctu averas

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reg.t red.

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t(al Dietsth.se t ehe the f el-to be f. vetted If f ae jd fsa.a. ee g e.g.s y g nagg a geneg ee.r e ( er J ab e.ornet.eclear.er.f ce es,e.Jis.re.) are es o s.<tc. sed to l** * *4 *t e s r set st ep b *.e le.-

'r*u 18 f ee ad toi e.

. e.e,q.aeed 2.s.sile se.et s,.t.

(e e.md.h e ser 1 eJees eerw1 en,-adt tste+1.re to be leserved..,,te.o 1,1 l*e.ee d s.,e.pn s e.ege, s., e,,, m (.,r *

li f aeld ste.ee e. eeg.s eed. eee yeweasse n,. srpoaoMr;.6c.s. isets A g. p fr project see..se t.dts.te asese.h se me. em 1,1.

4.

esolect susacas ay,e e see e s.e.re se e,sur serenee sweert nr.greeer.

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6.

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I 1

3 EOSIPTT; OF FPGMFt lPy PC - 71 developed a stenn Ir.4 out of tte r, ten; led off comtectica on 12/18/72.

9 FM 21s lask lasted fcr about 6.'s houra nt a rate er about 6 gyrf. Pirmt eenditions 1

.s Jurig this time ve.e o fel.owt:

Q R. C. Te perature 53??

?Q E. C. P esaure 2150 70!s; 2

fig

.Pressu-iter te=erature Ca$ F w

(g). "

!. R. C. ?=p r=ning.

6 To repair the leak, spry flo.r was secura.1 fer 12 =inutes by shutting PC 3 ar.d FC 9.

Cince R01 vna hhut during tr.e Icak, and RO 2 was throttled to =ain-tsin -ini _= repired spray flev, there prehtly van no spray ricv to the pressurizer for the entire duration of the lesk. Instesi, *.2e flev probably was out of the pressurizer thrcuch the tipry no:sle r.nl cut FO - V1 to the R. B.

-k at=or; he re. With RC-V1 sr.ut the leak vas locatei en the ;,ressuri:er side of RC-V1.

%I M

This was in viblation of DP 1101 01, scetion 1.2-4 which requires 0.75 g;n

((

. spray flow at all time when RC Te perature is gres.er than 200 F.

'?)

After EC-71 vas rapsired, spray flev vas reinsta.tei ter/- slowly to ::tinir_8ze the therm 1 shoe': to the spray no zle.

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.Titi BiBC0CX & WILCOX CCMPANY

.f.

PoitER GENERATION GROUP 4*.

k.

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L

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IR A'LN - PRCLTt.0T WCAGEST Froe 1.-

RG ICE;Tt - IJ1X. EY3Tcs (231) s os '.a s..' ;.

Co.t.

F:le No.

g g,-

3 ;

?'4 1 UKE PGIER Cc.

or Ref.;;g,3,g,7 3;33,t1 j

5std.

Date da ROCF'4 ELL VAL *.*ES SR h% & L61

- FL3I'ARY 2,1973 4

lm...,........-~.,,

W

?.

Ref:

1.

?3 - Wh File 120

't M 2

SIT.

f.61

. ) 6 l' 3.

& o AL Ime, Jr. to IR Anan 1-23 ~T3, EFA !+LL Fil 12'O

,473 i

' 8+.

Ltr., DICo. to GE Kulynych,1-12 ~T3, SubJ. Pocir rell vslvec

.ii{;s9 i,k I

' ne.ziter ard GT Su:21 (Pare asinCI ::et vit's Roc. ull personnel, Jan. 31, 1973, 5 !,^

r

.}f at their plant in Raleigh H.L*.

?:e Fol.w ing Rockwell persennel attended:

pe UA t

Harry 0 Crai:e, Product Rel' ability !.hnager

~

?g RL Lavsoc. Chief Product resip. in.31neer

-y JC Morris, l',r. Custceer Gt rice & Esles O=ders 1.

s O

?

We folleving ite=s were discussed with the objective of fer:121 sting r. ol.stions to the prob 1c s end questions descrited in the references ncied above:

~ l ' _'

h' 1.

Backre2 tina Prebles 3

t n

1he desien and effectivinces of 'he Wiva ve bee ent is questic.M t-/1 j N?

or enre of the re'erenced t. cove. Fockwell disssse tled and ext.fr-x1 the 4 V' '

fj corpe.er.t parts of FC-VS.

"t!e also virus 11y exanined these parts sr.d discurrei the proble.

N

~

'~

m Rockwell percerz.el do not telieve that a esu e for this tcekseat leeing can

-[j (,

befpty3 They did ste.te that they have tna. sands of the "nivains fi service \\:

9 a nee 19'-3. und the desia: and e" fee +17:es are proven. 2 2y alto r.tated that j

?

their valves are given a backca.at test at shell nydre prespure {';iNpsis for

/

a

. dthesc.veives) with packing in but with the gland locre.

,'.4 Y F

hM

~

SIS l.:.L'a.lco ques!.ior.ed the backsest design in't:is'ste-Ndis r. :*. area; j.i the at:.J::ption =2de that the 39 te sh,ulder rotated agairst the FS dick r:ut. Fockvell advises the lwer end cf the disk r.ut is in fact stellited 4:

-)

o (see attachment yl).

l., [

[

>(

f Rochwell doas not telieve it credible that the ster: :.he.:1 der vac cul,- 1/16" 1+',

{p[i thick an vss 10por el in S:0 f.W.

";e attached rhetch shows the '.ctu'il 01:?

i or tia crrpc::er.t perts ar,6 the entire ste s ic rcrt'.*nsi frc= a ringle "12:e of bsr s ock.

4 sed en visual obrervat'ons by the vritar, it a;7e rs that

,R 41 the end of the ste _ vss vern sur be the grirling n: tion due to repeated jy

~

u n

If

~

S (C

^

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i

m.w;.;,r g~=

, my,7-w-r~----~= -= -

-- n e -q 3

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y,

.y

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v V

j cycling of the valve after initial danage occurred. Be two holes' in the disk are to prevent pressure buil:h:p in the cavity inside the disk.

2 FC-V> Crscked feat i Secred Sten 9

A dye check vas perfor:wd en ;he seat of this valve while we were at Rockwell's plant. Acre is a sn211 erack acrcss the Stellite seat.

Rockwell recis it is r.ot pcssible to deter =ine the cause. Although it loes not occur with any great frequency, cracks in stellite seats does happen occasionally. Fockvc11 vill either repair thi. unit er furnish a new one, he scared sten was visuslly observed and eccpared with an actual size detailed drawing. Con-idering the location cf the secred portien, the relative locations of junk ring, lantem g?and ard travel distance of sten, the secting had to occur in the lantern ring zone. Again, cause is indeterainate, but it is highly pretable that the scoring is the result of the lantern ein? ! eing cocked in the stuffing box. Rochell stated they have r.t.ver before seen or had rep:rts of this type of dar. age.

If the valve was repacked at the site the lantern ring coald hsve been slightly cocked ani subsequent cycling of the valve eculd 'hsve csused the scering of the stem.

here is no evidence or indications on the lantern ring of this, but since the lantern ring is stellite it p obably vonWt show. Rockwell also feels j

thnt it is possible the lantern ring could tsve been slightly cocked when b

initially installed at the factor /. Eegardless of how or when the problem

. occurred. Rockwell vill replace this ste=-disk assenbly.

m It was further : tate

ty Rockwell that the ineccel wire insert in the Jchn C2 ane 187-I packing could not hsve caused the scoring on the sten.

3.

Iantern ?ir.c - Ecpscking Problen Withcut ques tion Rockve'l agrees that the arra-::enent as ^arnished dccs not allow repacF.ir.? the lover stuffing tox withcut renoving the cperators. It is a design error by Ecckvill. Sty have cesigned a four piece lantern gland to s ol s ; this problen. Be new Lantem Glands vill eensist of 2 pieces of the part shown on Rockvc11 dvg.

E-1SW52 and the split cylinders part shcun en dvh. B18?p2.

Two sets of these are finiched a :d Foel:vell vill have 'he rest conplcted the veek of Feb. ' :'or the eleven (11) Ocenee I valves.

L.

Grafoil "sekin_g Grafoil pachir.g was discussed with the Ecekvell Raleigh personnel and also vi'h Mr. Pcger Morden, Rockvell Pittsburr,b. Eockvell has r.ot formally stated their corporate positien recarding the use of Grafoil. Eey pointed cut that the test work was perforned to establish so e data on use of grafoil in valves. Rey have not done (brther verk tha. that described in their report V REP 7P-1.

A portien of Rock tell's report shoving their conclusions is reproduced and included t.s attsch e nt h2 After the conference call with Mr. :lorden it was concladed that 2cekvell feels thst their Univalve ir. nuitatic

)

for use with Grafcil packing providui the Itllowing itens are done prc-perly:

+

t D

l

W l

b$C iM W AE T'U G fC ELZ h N C C T W M C " P D-N " *"

l l

i

-.-..~,,..-

7, - _. _,..,.

...__y,.,_y,_,

s

\\'

V>

s.

Tole-v.ces src critics 1.

':he interferener fit reconr2 ended by the c:akers c2 Irafcil ('fnien Cartide) ast be used - thst is t disnetrical interference of 0.0&T t<., 0.010 reistive to the stuffing box snd 0.Of to 0.00T' with h

the ste.

b.

'"ha rincs of pschin: shccid te inserted two (2) eix. at a ti _e and eenpres:ed 25 to '255 ri the c'eps repested fer each additional set of %o rings.

c.

Ihe user r st :ss 5 '- self that he hss obtained the highest q2ality, lo's chloride content Grafoil, ?iFE C-';.

d.

Sora type of special tooling vill te required fcr the 1:nivalve with deep stuffing bex cuch is ve have. Foch ell has net develcred any tooling c" or procedures sin:e they feel it is the user's decision,st this point in tine.whether er not to use Crafoil.

Flease note that with ' respect to '.te:2 C abcVe,3ockwell is svare cf a report fren sc~e pisn: where crafoil as.nstalled in vsrious valves. Abrequ ently, it vns fcuni that there vss severe pitting cf valve stens and it was 1 ster

_ confir cd that the Cr2 foil used hsd 1&O pp:tleachable chlorides. It is reported teiay that 'Jnien Carbide ncv designates the grafoil fcr nuclesr use as C ::. :: is r.cre erpt sive a.d the rarafseture perferns 2iditiensi verk to aszure that chlorides are 200 pps or lese. It is also repcrted that this disii;nsted packing is being supp'.ied with sacrifical cetal vafers for insertien tt'veen rings of pachn', to prevent corrosien attack en the valve stens.

5.

Ecchen vill submit f:ilure anslysis reports on both RC-v1 a51 ?c-v5.

g Sr"-ation and Peco=ttdstions:

i 1.

2:e l'nivalue backses'. desig. is censicerel nore thsn ade. uate ar.i effective i

by Roebcell.

2.

Replacenent parts fer ?O ;l tre being rsnufactured. Ecchell vill r.ot ast;te resper.sitility cince the ds:sge vas no, due to desic: or faulty ccepone.tc.

3 Replacement ;srts for 90 '.5 are being suuplied by Rockuell at their exptnse since the d2=: e it. of indete=inate cause.

!W Intern clands 'o -11 b-v r packing vith 2t re :oving eperaters are tcir -

supplied 1 r Focin ell

.t

'-'ir expente.

s 1

5.

Z'i s!.cnd dvire Se cus'c-ar that i they cheese tc, usa tifsil it shcaid to their resp:ncliilit" bees:re there sre too 2ny 1 :ncvr.s accu:

Ornfoil..11:o 2t the tine L.: purchased these valves. 'Irr. foil vss i

un' r.cvn; therefere E. IhrGd nc: ';e crected to retro fit.

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A rev.e,r of the teakage of the GrafoJ sets s.* oxs that

~("d att t..r* cne of the seven had fewer depos4rs aro;.rxs the

- ? S : > @ ',, / / c V

stem cctnpated to the g:and O.D suggesting the it wah the

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' h~ sta'fing con was not perfect.(This was an anomaf r at first.

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gm (p* Sn because stat c seats a'o normally supeto* to a ste n, or 5

f.[

a hbd rnoving seat) it rs. Berefore, mest ireportart that G afo#

WM s - c.,a9 e PecW. rev sos. t mm S.Sevn e.e tr.

rings are designed to I.t the speci!.c nmersional range he es ce4 or tee oww C a%s prig wes Now sq asmst com-(i.e., tnCludCQ no' mal manufacturing to eracces) of the seem obsece or carstas eepeus aeo ms one sievn oms s:aad valve stuffirg oot it rnay not be poss. bee !O use "c'!!?.e shelf'* tmgs, and cccawnecation with the Graforf sappieer Grafcelis esser $aJy expanded g*3pNte produced bf rnust be adCQuate to assure that Inc proper rings suDjecting f:ake, pond *-r or Ch.D graphdo particles, are t'nanufact rre d.,

.y with a Ngh degree of a:om of.en:ation. to an onczing Comments on ta.e appearances of the packings rnedsurn such as St ituric acxt and rutric acid T* e obscried durst'g 19e pcs:.tes: czarn.ra or's may also te omidmrg agent forrns openergs telneen the lafers of of interest. Grafoil was essentially unchanged, except thst casbon netnorks art the graph.tir. '.".'nen removec from it could not to removed casdy as wh:le rings ard s.ou!d the acid and then rancly rea:cd, the gas trapped break into layers. The J-C 762SGF grap5:e f.! ament withm the grapev:a layers espncs. in turn.:spaMrg packings var.ed cons.derably. some being intact as when the graphite. Thrs capar.ced mass is then cornpressed instaped and o*hers treaung down ir::o very short f bers.

or compacted ta the cesrred der.s.ty of rr.echan ca:ty Some rings were truch hke r:ew. sta;! soft and resi eet, ronity producitig a sheet r-a:ctrat. An expans'on cf wh;Ie othere were hard and sbtf. Sctr.c were rather wet,,

60 to 2CO times t e orig >.a! tNckress ia prefer..d others very dry. It star d apcear that high mechanical i

because this wn! prodace a cohesive sheet ma!cr'ai loadrng casses the f bets cf J-C 1625GF to fractu*e.The

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wnthout the nced for tencers,Icav.ng the product J-C 1874X pacur'g was gee.erally somte. tat harder a1d - '7e virtea!ty pure graptute.

less resdiert than when naw. In turnmary. the g*ee* cst Graphite has excellent meet.aNcal properties at change was shewrn by J-C 7625GF, tne least by Grafod.

coevated temperaturcs. good traction p cporties, is r:ciaden Operatir g tscs of tt.e wafve sterns were never I

rcSistant and chemically inert. and pcssesscs the recassary eacess've, except for packrag E-f i7 Tes's 1 and 2. Gratoit t>asic proper!.cs of a good compress.cn packing materias in particular had ra*her low stem operatang tcrques at Q tot nucfear serv.ce. Other oacrir-g matcrials possess ma1y fu:1 operating presturcs.

b of these same? propmes. partcularly tr.e grapt.ite t: amer t 2

guckings, but one important prcperty a:1 :he others tack is a CONCLUSIONS twgn res:s:ance to ccmp ess.cn set. It.s this characteresac,

1. Trac.teena: beak!cd asbestos-grapNte impregnated the a*26 sty to rr.ain:am ets preload on the val <c stem and packings are r'o! recem rcr.ded for cri'ical nuclear services stu'br.g tion wa!!s desp.te 15cfma: acd pressure cyct.r 3 wt: eve hg5 presso c toratcd water is encounterec and r

that makes GrafoJ an esceotio-ci pac ung materet.

periodic g'and acg.s ncnis cannot be performed.

Wtu!e trest packmcs tese neignt f om temperatu e

2. Most schngs fad Of comprass ca set, er a toss of esposureloue to a Icrcs of WaWest Cra'c<! doe: r:ct, res;f.ency. thereby remorng the prclo:d recessary for en i

and in fact, wesghed s. amp %s sr.onec an increase due to cf'ecitve, rrmnterance-free stem seat.

j p obatge tre:hstare atssp;rcrt Sc:s ectr.ovcd from bonnets

3. Union Cerb:de Grafo# packing as supenor to att o9er j

S.15 and 17 everaged a 27 gercent ac qht increase.

typcs exam;ncd in th's preicct in terms cf seatatdefy ar.d Dy ccnnparr*,an. J-C 167/X sest ar ave;P;o four pcrcent.

mmimal maintenance. cse to its interer.t proper:A:s of J-C IC25GF v.as rot (vaLa ed t?vt.t snottd not show irn en. ternperatu e and rad.ation res's:ance, aad r

sign:ficaat change.

frce Je

rom ccTpecsson set.

Il reprd to me setor.d cues %r. the reason far the i,Grafov Fc* rag ca*i oc satrsfactorJy insta%d at:

two Gr.rb! fauer r. v.as c oncNded trat these res tin vaher no.v in service wn:n standard ose: ensions a-d from tha fact that the r. cgs eere not taJosed dimensia aay finishes wi'ro.t catra%cary cleanmg pocedures.

l tar the Unwaf <e stuf' w; bc u That is. the manufactcrer 5 When nstattng Grafo.1in ricw or used va'vc s the recor mcr.ds a c.a act'acat ir:erictenec o! 0 003 to 0 01C*

rnanufacturers spec *.ca!.ons for intaf:yence fits ath bc 5 relat.ve to the s:u!".ng to aed 0 CW to 0 003* ni:5 the stem the sNtf ng tou Dore ad stem diameter nmst to lo".cwed for unknmeri reasuns, t*ne rit Gs u;cd ar; arcroly d.d rut for low teakPge performance.

provid? these (as A rs'wew ct the sahe c mensions and tt o

6. A composite packing using one Grarcit tmg and i

probabla pacnng J, tensions, tused on unused tv J-C f623GF tar the otner tegs ed!! grcM!y reduce *he ccst shows t* a: the two fr!cd G aSi p.icg. bonneri 3 aad of a futi Grafo.1 sistern. t'ut at the prot atJe capense et

15. probably t'ad clearar ces of scwr4 thousandes awd hig* ice :eakcge and shorter service hfe.

tt.e icilem estys Trc-top rea,s p ocaNy rangcd f om zero The author v..s*.es ta the.nk the pachir g ma n/actorces to 0 03."interfererest st.s!Icts than 51tf the rmr. mum for it rst assstance m corttucting tha,e tests. In s't cu'a',

O OCOV. Performinq a smlar Snat;s.s ca the other fae sc s the cooperatron of the Crane Packir.g Companf a.<! tw a

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~O liiE BIsBCOCK & W4 LCOX COMPANY

$ER CEl;ERAilM GROUP To l

K.SGUDC"R

."/d\\CER - /dNILIARY SYSTDS troa L. R. AL!RJ. ASSOL41TE PinJE0f 'maGER (EXT. 23101

Cust, file KO-cr Ref.

IIIKT ITIC R O'TR.Y

~12E20 Su bj.

Date l'alSSUrl:II - $!RiY VALVE 3/29/73 j

n..i....................,..6..,

IMference: Mc:no R.G. htrnicy to K. SchroMer dated.'htch 16, 1973, l

Subject : I>ressuri:cr Spray Line Valve 14.akage Prebicas 9

(RC-VI & RC-V5)

~

j~

s

'Ihe refcrenced rcre st=uri:ed the observatiens rr.de and the cc,clusions drswn

)

during the site visit mde by hbssrs. Butt, Rrcnley, and !bt:gru'>er. I feel tJiat this visit was hcipful and that this rero provides badly needed do:trentation to this prcSica.

g i na attaching for ymir informtion, Prodxt Specification "202 which describes nelfat's tr:Jear valve sten bellows. Ibri::g a recer.t visit to Ecifab I discttssed this product with Cr:ck Turcotte and Pob oheiri. Icifab is currently febricativ.g i

several of the.se bellones, 3bdel E150, for Ccpes-Vu:c._n. %ese valves tri]1 be insta11e1 in a liestinghcuse pir.nt.

I was not ah!c :e deternine the e::act service of there vahes, utly that it was high pressure, hish te:perature, borated water service..I t:nderstan.i that these are globe valves in the 21/2" to 4" size range.

It r.ay be wrth.dtile to pursue this with Copes-Vulcri in 11.e event we continue to cycrie::ce probicm with tne Ibckwell valve.

N L. R. Allen IA\\:ch cc:

t'.

C. Ritt k

G. Bumicy O.

hittgnber R. L. rittreas' R. V. Strat6 5

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K. SCFR0!p.R v.O*ACTR - AtNIILRY SYSTD'S

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R. G. EURNIIi - AITII.IARY SYSTEMS (2231) j j'

Cast.

File No. ESS-3/12M2 &

i or Ref. NSS-3,4.9/SA30.41 DLT2 T0VER COv?ANY Rockwell PTISSER1ZER SPRAY LINE YAL*.'E LEAKAGE PRO 3LEMS Date (FO-VI & RC-VS)

'j j... -.................. -............ +

Ref e rer.ces:

1.

SPR-444 File 12M2 2

SPR-461 File 12M2 3.

SPR-495 File 12M2 4.

Ltr. !?Co. to G.E. Kaly=ych 1-12 Emekvall Valves 5.

Mc=o R.G. Burnicy to L.R. Allen 2 12-73, yile 12H2 y

6.

Telecepy Meno B.L. Day to L.R. Allen 3-12-73 j

g l

Tac writer, W.C. Butt, and O. Putzgruber were at the Oconee Site Tuesday af ter-

.l j

oen.v:rch 13 and rest of *'edsesday March 14 to assis* s assessing the applica-J e

tion of the two b5V valves in the Pressurizer S; ray ?

and to for=ulate a l

H resolution to the latest leakage probles covered ' y :

.496 Rev. 1.

w i

o 3riefly su==arized, the references chove have covered =u=erous problems including g]

' broken ste:/ disc asse blies, cracked seat, damaged operator parts, repacking j

prcblers and excessive stuffing box leakage. n:e latest prob 1c= vas excessive 1eakage thrc igh the stuffing box and out the ste leakcff cc: scetica.

j 3

1 y

In addition to the Auxiliary Systems personnel, the folicwing personnel vere

]

inv., Ired in several discussions at dif ferent ti 2s to ccm up with a resolutien:

s 1

Clint Strecrall - Rech' ell Sales y

Neil Wst - Eockvell Service Eng.

James Sig=an - E'C: Maintenance j

R.J. McConnell - ELV Site Service y

f E.L. Day - 512 Site Service j

[.

Bob Eaier - E12 Site Service j

f4 i

rpen arrival at the site, we vent to the area where the valves are =ounted.

~he M

tva Rockwell pecple, two tuke Maintenance workers and 3. Day were already there ren:cing the Cra S ~. gcciing. ii. Day had already checked the accessible area of t-tg the v.lse stw with a dial Indicatcr by =anually actuati=g the operator. In the t

a t:.2 checked, there :s ene point of.031" runcut detec:ca and this could hr.e

)

'M bee. See grease ar fcrcign catter on the stem. It was cc cluded that the sten

'f hj is not bowed or cut cf ali;.ent in the area checked.

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O 3-One interesting observation nada by both Duke and B&W site perc sci is that prior to and during the first hat functional test, there were no leakage problems. During this cite, the sten leakoff connecticns were either capped or welded closed. The Icakage began after the leakoff con =ections were hooked up.

This e ry or may not be significant. To speculate, it could be that during the first tests the additional packing above the lantern gland was sufficient even though there was so=e leakage up through the first set of packing rings.

It =ay be that the lantern grand and sten leakoff are not necessary. As previously discussed, the letdown cooler valves have not leaked excessively and the ster.

leakoff is plugged.

Mr. Sigman has suggested to Duke Engineering that a smal' canual valve be added in the leakoff lice for isolation to find out if the packing vill hold vithout ste= leakoff cpen.

A verbal report has just been received frc: B. Baker, B5W Site (3-16-73, OS00 hrs) that the repacking and testing has been co pleted. There is no leakage 8 1000 psig applied on the stuffing box. RC-V5 vill be checked in the saEe rianner and if there is leakage, it vill be repacked using the sa:e procedure as used for RC-V1.

h.

RGB:ebe cc 'LR Alles L*C Butt BL Day /B Baker J Ittner CE Kulynych R Pittaan O Put gruber i

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is far as possible, the sten area in the stef fia.g box was visually inspe cted and h'

no scoring of the ste= vas observed. Note that it is not possible to so the stes p

area in the 1cuer stuf fing box. We lates tried to cbserve this a::ca with a 8,_

Tibrescope, but this was cet successful. There is r.o rease to suspect aten y

scoring in the lower stuf fing box since it was previot. sly concluded that ecoring p

cccurred in the lentern ring zese.

I' Daring several discussic:ts '.'ednesday, March 14, it was confir:mi by Mr. Si2r.an t_

that Crafoil had been installed, but no procedure was used to assure conformance vith the reco : endatic:s of Uni:n Carbide, the canufacturers of this packing.

Withcut some special ecols for co pressinr this =sterial, it is not possible j_

to install prcperly in valves with deep stuffing bexes, lantern gland;and gland cut arrangement such as we have. It was concluded that the valve had been packed improperly and this sas the casse of excessive leakage.

n e plan of corrective action is as follevst

_.;=

1 Duke will =ake necessary tools as required to pack valve using Crafeil.

NOTE: It is Duke's decision te ase Crafoii packing.

.q 2.

Valve is to be nacied in the prescribed =anner as recossended by packing canufacturcr.

3.

Check torque to assure each gland riut is tightened equally.

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I.. Cycle valve by ha:d and check stem alignment using dial indicator.

5.

Pressurize packing chamber thr: ugh sten leakoff cettectien with portablo I

hydre pu=p:

a.

Pressurize to 500 psig, hold and evele. Check fer leakage.

y 4

b.

Increase pressure to 1903 psig, cycle and check for leakage.

Af ter each cycle, it ray be necessary to further tii,hten gland nuts. This

[

should be done in a:cerds cc vith packing nanuf acturer's recc=endations.

[

, r 4

his procedure a.d testing are to be observed by Ei'.i with the results doct.=cnted y

and reported upcn cerpletica. The real pr,of of the packing ef ficiency cannot y

be checked on this valve s.ntil the systen is b..ek to te perature and pressure.

{

. c re do not believe there is any reason for disqualifyin; the Univa?ve for service 8

in the spray line. 'The I Ict and oatlet valves for the letden ecolers are ice:-

tical with the e::ceptics of a s. iller Linitorque, and there are no re; orts of

[ (

n :essive leakage.

Th.: c-cracia of.TC-VI is slig.htly different in that it goes to '37 opcn wherces the Icedr. n valves are either fully open or fully closed.

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by h:-nin : c0ch r! u;d nat, o.t -Tour;.h (i/*;) / .a a ~ ~ " e,a.w, yr n in Tc,. -at if necer.r. z v: nil 1 rfr: I? . c r ;..~ f.c.,hc 8 M.i 1 cahnt;o. ~ . rccc:tr.c.t;t to tit;hten the rachi' : nrte Pc :p V ^ I c;rcle t.ncr cach tidit.cnin;;. .. ~.. &. ~.. valve on J i de. ?@iuM * % A.la. ig gc;.f,.y.,. e.. '1he above torcno values, 3040 ft. Its., tu e tr n-4 vi re " ,'d te = j;2 ...,n. . S' r? 9 co tt'.J d -r.~ Mrs the cbove proccCure in t m l on nonr*1 erreeV ..,i: c. r.odirJed. Mic Le.nic cenling propertier: of ;ceAr. M G :7.. ' '} '.nj rkrr. L-6 .ff8...,j. sten t.nd, chMur stil,. :n* ';i, C * : m e ;-~t,it '.. dr ,. ) iy. 2TM '. - n s;, .4w-4',g. . depend on J nterfercaco

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Action:

Peplachl valve interrals, yoke and yoke nut.. .A r s 1.'va luatica: -. IMtorque.imprcre:-ly set up. Bachaeating on torque switch. ~ Reset to shuto*f on limit switch so as not to coast into back t '~ seat. Eachsesting to be doce by hand. Scme c/cles en new' internals prior to reactting operator. ?,.g 4 .;' ;, 1.% _ Cma:ents : ,,Both yckes verc loose ia the threads on the valve hdy. ' Stem 'f

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. j ~ ;; scoring attributird.by Dockvell (Ray, Green) to nis - clignment.,.'.~.y M .e. .c g:Dc .c a 2. Ss cond Failure i ' ?, ' A .' r - . ~, > v-a s. a;. 3 %.. w.

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};, (;,i -a 3 ' q; 'j" Q - ?. J C. "'s.' ~ ?Sympton - Talve st'ack shut.. 2- ,g- .. c .Insppetion:

Sten had to be cut to petr.it dis-assembly.' Sect in body and on s

' plug b ased. Stellite gone en one side of pita;. Stm scorei 5 by lastern gland. Backseat damaged. Limitorque gears ds:saged. m a' \\ s .y J p ....~ 7bter cide of clutch in close direction per sketch. ' Hand wheel , }. cide cf clutch in open direction (no heat marks) in similar cen-dition. Handvheel dasage probably occured during attemptc to backseat valve durins.lat failure. Yoke nut destroyed during i ~-' disa:senbly. ' Ac' tion: Iagped in seat. Replaced plug & sten. Refaced linitorque opera-i tor mounting plate to inp:tve align =ent. F.epacked with "Graffoil". and installed cplit lantern ring. Ecpaired cperator. ,7*: s 8 Evaluation: Nssibly partial engagement of clutch on noter gear allowed ~ slippage' and repeated ha=ner blevs to drive valve into seat vithcut opening torque switch. Heat tr. arks and damage to limitor-qu 6 ears suggest this. Operator would eventually stop on ~ ' ' s therm 1 overloads. e4 .2 f Cements: , Esy Creen (Rockwall Engineer) stated that he still suspects J W. i # ', ntis-alignment. No way to measure with valve installed. Operate 'y and inspect sten for repeated scoring. Sten scoring & loss of stellite are symptoms of nis-align:nent. Fix is to replace yoke -4 if mis-aligre.ent confirmed. Yeke has already been n placed once. ,s - D?O. msintenance persoucel report that both yokes were loose in the threads and the threads veuld not provide aligment. ' Fop [ of ycke vaa bir.ed due to ereessive stem thrust. Nov yoke nut 9. h- ,, 4 g,d e' /g ' -n"'! +- G,.. C y,Q +.,,. - 4..> ~ e.. < 3, O ??w,,)

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L~atu J Obcock & Wilcox %, ce~,. o e,. P.O. Bea 1760. b,oNrg.Vs. 245 5 Te'e:rene:(73313345111 l February o,1973 l B73-034 j ) i Mr. S. K. Blackley IVr:E FCIR CC:7.bY P. O. Eox 217S Charlotte,.'*. C. 23201 Attention: Mr. T. F. Wyke

Subject:

Ocence 1, 2 6 3 Rockw11 Valves Referer.ce: Ibke letter dated Jarrnry 12,1973,Sbj: Reckwell Valves Gentic:2n:

O The folic ting is subnitted to ceraents r:ade on the subject valves in the.

refererred letter:

1.

Sten Material: The sten rr.:erial of m1ves supplied by Roch; ell is AST+M61, Grade 630. 7..is natcrial is not a ferritic stainless stcel.

It is, hot.crer, a precipitation h:rdened 17-4 pil =a:erial. This t>Te mterial is used in ::rnr.:s other placc 3 in the re c:cr coolant systen and is considered te be ::q:Ic:ely ec patib1q with bric acid solutions at high ic:p:ratures. T:r this reasen we see no ressca to pursue sten plc:cr. n: cn tha su':j:::.21res.

In additien, R::k':11 is s.7plyin; a replacenen: 'far tha da.2;ed sten frcr.2

/

1 RC-V1. T.te rep 10::. = : si:n ::ill ba.\\SL:.;533, Grade ef0.

'.le have reviewed this raterial f : this application and fin.i it to be acceptable.

2.

5:ered Sten: T2 s:or:1 sten fren IRC-Y3 was visually exanined by 30.! :r.d T.cck:211 p::sen 21 a: P.::kcell's nalbigh F12.":.

The s:c:it s..

c rpared eith a full si::d de::i1 dr:ein;. Consid2 ring t*.c lo::tica of the scored pcrtien, the reistive lo:stions of the junk ring, the lantern gland, end the travel dis =:2 of the sten, the scerin; had to occur in the Icntern ring :ene.

T..: cy. :t cause of the scor_n; is no-1:10m, hoicever, it is highly pr:bable th : it :.25 the result of the stellite lantern rin; being ccei:cd in the stuffin; S::. R:chell person.21 st::ed that they had not seen this type of d=0;c before. They furt e-sta:cd that the lantern O

ri=2 ccuia nave cce= i=>:=ttea i= a c== ed resitic= at the 1:c crv or after sepackin; in the fic1d. T: re us no eviden:e of wear or indications on

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.THE BABCOCK & Wil.COX COMPANY O'TnERGENERATIONGROUP o

l L. R. Allen - tsssociate Project Manager - neactor Contract.

F rc.s A. L. Lowe, Jr. - Materials-Development - Component Engr.

(2170) su m.s Cost.

File N0*NSS-1 SFR444/1 Duke Power Company

'

12H2 Sie bj.

Date Rockwell Valve Stem Mater tal January 23, 1973 l......................,.....,

F

Reference:

Memo Froa R. L. Pittman To t.. R. Allen, A

Subject:

Rockwell Valves, file No. As Above, Dated 1/22/73

.% ~

c I sould like to clarify the statement in the above referenced meco concerning l

valve stcs: zaterial.

The currently used naterial is 17-4 PH whl:h is a precipitation-harde ing stain-O i ** *t i

" t - ' aro* 6'r >>rca sed to ^5'a ^-45i cr de 63o-

^ithe"a" -

l stainless steel, it is only a distart cousin to Type 30'# stainless steel. The 17-4 PH is considered cocpatible with the borated water environ w nt of PVR's provided it is in the proper heat 'reat-d condit!on, (i.e Condition Hil50).

The ASTM dropped the A-461 specification and replaccd it with a new specification for 17-4 Ph.

This nc s specification is A-564 but is so new that it did not reake the 1972 Edition of the ASTM Standards. Because of this change in specifications, the vendor apparently has chosen a readily available new alloy for the stem.

This

)

new alloy is included in ASTM A-638 as Grade 660. The eaterial is known connercially j

as A-286 Alloy *Aich we use for several applications in our nuclear systems.

The alloy is stainless alloy, but its only similarity to 17-4 PH is the fact it is prec ipi t a t Ion-;ia rden ing.

i Please Leep Duke Power Cc eny correct'y inforcad.

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R. R. Beach R. G. Burnley

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TIT:.E [ ( V \\ STc AM To k.T. O'\\ (ce.!V e ll -$ 011. For Information

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M ;crt: frc: the 3Y/ site effice ts e inii:a*.:d t deuM.s are teing ex;te:Eed ty sere ; artier, cencerning the ts

stibility cf the s'.e sterial in cur EO-75 and EC-V1 vith terrtei v: ter.

Sizee this questics has arisen, a ec plete reviev Of these raterials nas tee:

cc: ducted.

These valve sttrs vare rr=u'ae:=ed.^.*

e. 3C s*, airless steel; precipitatic: hardened to further ent=:e its strength ch:rseteri:ti:s. ~.;

e._,letic cf this ha 'a-N g process, this caterial =et e.;l requirenents cf the A.3* 161, Grade 633. In s - /,

h this :sterial Is a 17-h ;E sta' 'e:s steel, vtiet is cctsidered cc:pstible vitt tish te.;c atures and t:rsted vs_ter.

An errict ta: t.ircify teen ;isced with the ?:e,-.e. C: ;c atien to.^.:rnish a replace rent ste f:r PC-71 vtich vz; d= r ei i..-ing 1:: "unctic a1 testin.;. Circe the crigin:1 star :sterial is no lenger c.re.i stle, it vi 1 te neces:2.ry t:.. r.ich

^

a si:11er Erade cf 17 L pH stair.less steel, vtics eets the require ente cf AI '.: 633, Grar'e 60, s d is censidered t/ our P.ateria s perstael a.s teing acceptable f.--

its pr:pc:e1 epplics.tien.

Preli 3..ary failure a Cysis e '

' e ress::s f:- failure :: 1-?.0-71 is itzt it st.r esus,el ty e f 221ty litit svitet se::ing. 1 ::.ve teen ch.-ise d 'cy cu-21.;i-neering,c;arttent -hat this is a settin; perf:rred i: the field by the cust=:ar, which stculd alleviate m' er any liability f:r 011: ;-:ble. (EF3 Lit /1).

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.NER SEhERATI0ff GRCUP l

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R. C. Surnley - Anlilary Syste is i

Fros A. L. tc==, Jr.

.t terial s-Development Component Engr.

l s_.70) ses.43.s L

Cast.

File No.

W cr Ref. NSS-3/5.,33.f.I

[

Rockwell 593).

7 Date

{

Yahe Ste, Materials-Spray Lir.e Valve RC-V!

January 17. 1973 d

j...........................i, E

r e

I fare reviewed P.ockwall Manufacturing Coq,pr.sy's proposed replace:went stem mate. !al' ASTM 3633 Gr. 660 and find it acceptable for the proposed applicatlon.

lh J

T Shuld tacy wish to continue to ese this replacement ster, material, I would recon-eend that it be specified in accordence with /.STM A564-72, " Hot-%Iled And Cold-Finisned.?.ge-Harceirig Stainless Ar.d Heat-Resistino Steel 8 tars And Shapes."

E l e% tct that one of their reasons fcr tranting to change this rut.* rial Is that

[

ther.e:e not zware of the new specification coverine Gr. 63? elloy.

ALL. Jr./Ja cc:

L. L. Allen 3

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D. F -Levstek 3.

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C. Schroeder y

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s POWER'GENERATlO!! GROUP

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A. L. Lcwe - Principal Materials Engineer

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From

.h P.. G. Burnley - Auxiliary Syste:.s (22:13

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If File No.

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l Valve Stem Material - Spray Line Valve RC-VI January 16, 1973 '

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Due to dae.sge that occurred to the original ste:s due to.=t icproper set if ait

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switch, the 1. tem f or the subject valve cust.be replaced.

The criginal ster re.terial was furnished' to ASTM A461 crade 630 This ASnt,

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4) spec was discontinued in 197a and was repInced b r.A637, A633 'and A635.

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Rockwell' Mf.. Co. pro [cscs to ' furnish a replacewnt stes to ASIM A638 Cr 660.'

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Maximum design conditicas for the location of this valve (spray line to s

o pressurizer) as 2500 psig 0 670F. Norn41 operation will be s2200 psig a

1 "2i 0 555 to 560F.

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h Please review this pecposed valve stem c:aterial and let us, have your recen:mendations, Per Al Manual, prccedure NPG-0408-08.

4j Mr. Larry' Allen, Proj. Pgc.t., has given verbal approval fer time required to be chargec to f,20-0003-96-05.

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i THE BABCOCK & WILCOX COMPANY kER GENERATION GROUP l

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Distribution Froin

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R. L. Pittman, Kuclear Service (2805) ies u3.,

Cust.

File No.

l Duke Power Ccepany cr Ref. :s.3 sps :.U.

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Ruckven Yalves (STR U.L-NS3 3)

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Distribution

.c R. E. Leach R. J. McCc=nell

i J. P. Ittner H. He:::icke G. E. Kulpych G. 7. S d L. R. Allen-S. S. ~4slker R. V. Straub J. C. Dedde=s R. G lbrnley o

On 1-12-73 a conference can was placed to 7.he Rockvell Cor;cration in Es'.eigh.

North Carolina to dise:.:ss the problems which h*ve hees recently erperienced C

at the Oconee site.

.y The fonoving personnel pa icipated in the call fre: EW:

'L. Allen R. Burnley d

T. Cuni j

S. Walker q

R. P;ttmana -

h' The call van placed to Harry Crane, Dick Esvsen e.nl !!= Merris, all assi.- ei to the Rockvell plant in Raleigh.

n y

A=ong the several ite=s discussed, Mr. Crane was inferred cf the i==ediate require =ent y

for replacement parta to repair RC-V1 cn Unit II, since parts had bee: re=rred fres 9

this valve during EFT to repair the damaged valve on t.*

it 1.

Dick Lawsc: re;iled that spare parts for this valve were not stocked and it v~e.1d require 3 h =c-.ths f r J

..achining and delivery unless it was of such urgency as to necessitate tasi carrying p

them through the sh p.

Since these parts shall be used en 2 RC-71, a target cf one g

onth was requested. Mr. Crane was advised that a neckwell Service Engireer is requested to be at the Oconee site to re-asse=ble 2 T.0-71 vhen the parts are rerdy v

Q for shipment. Mr. Crane stated that the cause for tsilt e on 1 R::-V1 vs.s deter =ined y

to be a faulty limit switch on the operater and that sin:e this is a,c tirs :sde by the custo=er, Rockwell is considered relieved of the financial resp: sittlities g

usociated with this incident. This point was mutually agreed up:n by tct:: perties

-nd a written report of this failure analysis was requested and precised f:r i==ediate h

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f kr. Crane ves then re:inded that there are at least;83' Dock $rellvvalves'at* t.be'Cecree 9

Jcb site that cent be repacked with the operator in place and EW is axalti:s a w

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Distribution Janusry 13, 1973 u

c soluticn to this arpsrent desi;;n discrepancy. It was explained i us t nt a f

lantern ring similar to the existir.g ene shall be utilized except that it will y

be in four pieces so it may te lifted up and reave.1 from the valve allevir4 easy a: cess to the lower. packing rings. Mr. Crano was advised that this vns n

consi.erei ty MW as a E6chwell responsibility, and we needed an esticate of ti e involved before the correction vill be cade. He also agreed that the respensibility l

associated with this proble= belcnged to Reckwell uni 'that they vill =ake every cffert to have these lantern rings eschined and delivered to the job site during the q

first week of February,1973. Eevever, this is the plan for only 12 of the E3 valves concerned (the 2h" valves) because the remainir.g 1" valves vere produced at the Fockvell plant in Sulphur Springs, Texas. Ten Sund agreed that he vill centact the

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local.hockwell sales representative to coordinate the sa=e solutien fcr this prcblem d

on the re=aining Rockwell valves, as agreed upon for the f%" valves.

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W The next ite= presented to Rockwell was "that we questien the stility to repack

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thece valves in service by back seating tha=" as was specified by MV vhen 'J.ey were 1

ordered. They were infermed that two holes are in each disc plus which vill bec=ingly allt.v syste: pressure ir. side the plug and into the area of the packing thus-preventing packing res: val under pressure. Dick La sen explained that this valve has two h

ackseatst one in its usual location ani the second on the end 'of toe sten, seating g

against the underside of the dise nut which prevents systes pressure on the packing li gland when the valve i tackseated. According to the drav.*ng cf this valve it appears

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g that this would indeed perfor: as Mr. Larsen had stated. Hart Eennicke has new in-tap far=ed me that when 1;RO-V5 was disasse= bled, that the backseat a;pnrently vculd not j

seat because tPare was a sufficient arount of steam coming frer the packing gland cavity to cause conce n.

If it 's deter ined that other valves of this type are y

also leating past the backseat, then it =ust te resolvel vith Recivell.

hi s should be established by the site if probable, considering other seteduled con =itt-cents.

L Mr. Crane was advised that as soon as 1 RC-V5 is cut from the syste= it shall be returned to him for reptirs to the cracked seat.

It is his epinion that this valve can te readied fcr rett. n te.he I.ite within 3 L conths. Meanwhile, the valve

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frc= Unit III will te i rreved and installed in Unit I.

It was rutually agreci

.l thst responsibility fcr thin valva belcngs to Rockwell.

Finally, Jin Morris stated that the stem material criginally used to =achine RO-V1 "j

was no lors;er available (ACTM k61, grsde 630). He stated that th".s =aterial was a 316 SS, precipitation hardened. Srther erwecing its strength characteristics and j

ceets the specifications of AS7W L61, grade 630. The new ste= vill be =ade frc= a

-1=ilar =aterial that is also censidered acceptable for use with high te=peratures ud high concentrations of beric acid.

he orginial caterial is a 17 !. ph SS, thus

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Central Engineering Files 5.F. Debel - Quality Assuance

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1/12/ 3 Serial !;o. 7:331/'.35_c,

2f: ContractQ ruoD Propo:.i tien ]

OtherC Contract EDO or Ceep No.

Group :;o.

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' O :;ormal Cost Proposition No.

Contract 2S hl 1

O A! normal Cost I f Ahaarmal Cost:

Charge !;o.

CO-00 ~l'3.33-05 l Custe:wr:

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Cnante Order O

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?lt sse istue a purchase crier te R:c2vell C: p. to =snufacture the felleving ps.rts to be used as repir. cements fer *he ones re oved fr:rs RC.*-1 on Duke Unit II.

1.

disc i

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'n'en there par ts t.re rca!;r fer inst::.llatien ve shall requ're. a ser rite

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g Rockwell nt ice site fcr ret:11 ding this vr.'ve tz veil as car.ing the prope operator l

liri; switch e1lustr.ents, j

..ny chstges which ! t.ve cec:::e'i up to th's ds.c er e result of Neil *.est's site visit a.ti the fail:.re r.:slysis v.:ich is being fc-r.rded by E:ckvcli sh:uld te included in this l

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l CUSIC:1ER:

o:onee r l CONTRACT NO:.-,..-.m SOCPE OF tC a AND F.EASON:

Procu-= _t;1 ace:e.t internsis for EC-71 which were damaged as a reruit cf incorrect limit s.ritet rettir.g by :me.

ra e.. cI: SPR U.1-1 RIO]lRO S!*RT DATE Jan. '73 REQUIRED C0',;PLETic't DATE

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72 0?IniC% CF EES?DNSIBILITY:

h0M CATES 3RY:

C (CORRECTIVE)

YEN 301

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$PcC,FY 6

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MATERI AL 5

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OTwER T.. AL ERECTIG.

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ML19322A364

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