ML20126M299

Final Deficiency Rept Re Hydrogen Embrittlement of 3/4-inch Lockwashers.Deficiency Determined Not Reportable Per 10CFR50.55e.Cable Tray Seismic Supports Preclude Use of Lockwashers.Analysis Performed by Charlton,Inc Encl

ML20126M299
Person / Time
Site:	Satsop
Issue date:	05/21/1981
From:	Leddick R, Zeddick R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Faulkenberry B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, GO3-81-2011, NUDOCS 8106160397
Download: ML20126M299 (16)

Text

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9 JUN 151981m F P

W shington Public Power Supply System S

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A JOINT OPERATING AGENCY

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r. o. sox inas sta44, w4swiscros 9 54 May 21, 1981 4

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s Nuclear Regulatory Commission, Region V Suite 202, Walnut Creek Plaza 4

1990 N. California Boulevard Walnut Creek, California 94596 g

s Attention: Mr. B. H. Faulkenberry Chief, Reactor Construction Projects Branch Gentlemen:

Subject:

PROJECT NOS. 3 AND 5 NRC INSPECTION OF WNP-3 AND WNP-5 DOCKET NUMBERS 50-508 AND 50-509 FINAL REPORT OF POTENTIAL 10CFR50.55(e)

HYDROGEN EMBRITTLEMENT OF 3/4 INCH LOCKWAHSERS

References:

1) ' Supply System Record of Telecon, J. C. Lockhart to D. Kirsch, dated April 28, 1981.

2) Supply System Record of Telecon, J. C. Lockhart to D. Kirsch, dated May 12, 1981.

Ebasco Engineering has determined that the hydrogen embrittlement of the 3/4 inch lockwashers is not reportable as a 10CFR50.55(e) as the present design of the cable tray seismic supports preclude the use of lockwashers, These lockwashers were purchased by Fischbach and Moore from the Ray Bristow Company, Inc., in Portland, Oregon.

Please find attached a copy of analysis on subject washers performed by Charlton, Inc., also of Portland, Oregon, for your information.

Should you have any questions or desire further information, please feel free to contact me directly.

Ve[y truly yours, R. S. Leddick

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Attachments Program Director, WNP-3/5 g

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D. Smithpeter - BPA Ebasco - New York WNP-3/5 Files - Richland THIS DOCUMENT CONTAlf4S POOR QUAllTY PAGES

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0 0 M E l-2233 S.W. CANYON ACAO PCRTLANO. cREcCN 97201 sc3/22sassa HAALTON, INC.

ENGINEEAING ANO APatlic $c:ENCES eking wem MATEmiAts ENvimoNMENT INOUSTALAL pao 0VcTS AND PACCESSES TO:

Ray 3ristov Cc=pany, Inc.

CLIIN NO. :

Attention:

Ray E. 3ristov, Jr.

16ho N. W. 1hth Avenue R"IRENCE NO. :

h608132 Per, land, OR 97209 CATE:

2-20-81 SU2JEC"': DE'"IEMINE CAUSE OF FRACTJRI 0F 3/k-nCH PLATID LOCr WASHI?S Me:crandu: Report frem Ralph Hudson, ?.E.

Project Director

!cu requested that MEI-Charlton, I:c. exa=ine fragments of electro:inc

1ated 3/L-1

ch helical lock vushers for cause of cracW ng during installation.

You submitted vashers which had been returned from service that fractured duri 6 installatics, and two types of vashers which had ot' yet been in-service.

One van electre isc plated and the other techanicay :1:e plated.

As e. result of our metallogrsphic examinatio: cf these vashers, ve have arrived at the following eccclusic=s.

1.

The lech -sshers which fractured in-service vere e=brittled and contained severe intergra: 1.lar and trs=s6: anular cracks.

1.1 The e=brittled cracks in these vashers occurred ;rier to the applica-tics of the electre:isc ;1sti=g c the surface.

i l

1.2 Washers which had been electre:isc plated and not yet been installed I

I also shoved evidence of incipient embrittled crachs.

13 The probable cause of the cracking would be a hydrogen e=brittlement that occurred during the ;ichling stages of the electre:inc plating

rocess.

No evidence of ex1de sce.les or decarburised :: es vere found vithis the cracks indicated.

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DE"I2MINE CAUSE OF FF.ACTUP2 CF 3/k-INCE PLATED LOCK iiASFJ".RS Ray Bris ov Co.pany, Inc.

Reference No. L608'32 r ;,,.

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ENGINEERING ANO &#PUED SCIENCIS wormng.im MATERIALS ENVIRONMENT INOUSTRIAL PACQUC*S ANO

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SU3 JECT: FRAC"URE OF 3/k-CICE PLA*ID LOC WASHIF.S i

REF.No.:

h608132 (Text conti=ued on next ; age 6 )

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PAGE:

3 SU2JEC*: FRAC 7JRE OF 3/h-UTCH PIATED LOCK WASEERS R",.No.:

h6083.32 i

3 The mechanically coated =ine vashers sueved no evidence of.ac..e=.br.ittled._

structure or incipient cracks.

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3oth the ::achanically coated and electrocinc coated vashers conformed to the specified requirements for. hardness and decarburized :ene depth.

As ' a result of our avamination, we ' vould reco==efd" that all vashers that vere electrocine plated' be rejected.

hcipient embrittle=ent could result in failure of "those vashers which do 'not yet show ' evidence of failure by

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Details of this. aramination are described in the following photographs and.

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Don Valley, P.E./CA Acccunt Director RE:ksb.

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StrNICT: TF.ACTJRI 0F 3/ k-DTCH. PLATED LOCT. 'WASw.S;-..!-

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F."'.NO.:

h608132 41.'..

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This photograph shows one of the ty'p'ical. exn mples of the fracture frag =ent..

Many.-of "th' se fractured * ' loch ' vashers had i:cre than one fracture-e plane as is evident'.by".this. fragment which has both ends fractured.

Exa=ina-t i.o..n. of. the.fr_actur. e. sur.f. ace.. sho. ved. that port.io..n..s._. v.ere darke.ned.,. as indi. cated by. th.e right a. rrov,,.whereas..the.r.e::ai.nde.r of...the. f.racture. vas a.b.r..ight cr_yst.al....

.....tions of th.e.

esta.b. lished..a. s line structure.

The.se dart.ened areas por were e=brittled structure in which the incipient cracks occurred.

An exten. si.o. n.. cf.

the crack, which caused the transverse fracture across the section of the lock

......:llel to the.longitudina.1 axis.. f the vasher,.is shown as a crack rnH.

par?.

o a-washer as indicated by the left arrev.

Two metallopaphic specimens vere recoved from this frag =ent for a =icro-scopic exanination. They are shown in the next figure.

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u This photo =acrograph shows the two metallegraphic speci. mens removed from the. fractured &ag=ent shown in Figure 1.

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'"'he ' specimen at" the top 'of this ;hotograph was t ka en ;nra.llel to the ic g-

- itudfraI axis of the"'vasher' including the tacture surface, which is oriented in this ;hetograph.t.cvards. the.,left.

The.scracks : indicat.ed by. the, arrov in Figure 1..are evident. on the top surface of.this specimen;.

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.x - The spec 1=en a.t the b.ettem vas'taken transversely thrcugh the vasher.

The spec 1=en is criented so that the inside circumferenti'al surface is towards the-tcp.

"'he cc=pression surfaces of the vasher, are to the right and left, and the outside circu=ferential surface is at the NtNm.

The crack shown by the arrev in Figure 1, is on the left side of this specimen (arrov).

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.Fi.r..:r.e 3 (66600) 2.1. '"his' '. photo =ic egraph shova the =icrostructure along the fractdre ' surf act Se e= brittle <:t of *he vasher. This portion of ;he fracture was dark in eclor.

structure was.found.to be intergra ulag. is its pro 6ression. and coincided with A high degree of seconda y intergra:relar cracks a.djacent.t.o the fracture sur. faces frac,ure 'sha. set'eri'stic' of. the. " bright.. crystalline structure' vaa The primarily a transgranular cleavag? type of cracking as a result of-overicad e4 the retaining.section..

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'h, Se fracture place along the darkeced area cf the fre.ctu N fractured vasher.

vas pri arily intergran"'a-as was the seconda.ry cracking adj acent to this Close examination of these ' cracks indicated no evidence ce frac,ure surface.

significant oxidation er decarburi-ation, as vould have been present frc: the as they vere m=ufactured.

last heat treatics process applied to the vashers of a Wdroge

typ, Se charac, eristics of these cracks vere highly indicative dte to the picV'd:g process which would have occurred at the ti.w embri.tlement the vashers vere plated.

'"his is shown 1: ::cre detail in the next figure.

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FRACTUPI 0F 3/k-DCH PLATED LOC VASHIRS FIF.NO.:

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surface of ' the electronine.. plated vashes

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s from the transverse specf=en 'shown. in Figure 2.

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stirface shoved evidence' of =ine plating extending devn within *he crack indi-t cating the crack vaM presen' ' j:rior to application of the electrodeposited :ine.

t This confir:s the :: cst likely cause for cracking in the picM 4sg. cr acid vash a

stages ef..the electro:ine plating.. process.

No internediate.1:aki;2g. or. process-

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ing; of that_vashers vas;. reported to :us foz-the. electro:inc. pla. ting procedure.

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fracture,; surface.~,4.The, structure. ghevs;: a.high degree of intergrmn ar embrit

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.. Met.allographic..exa=.ina.t.i.o.n and hardness tests..ind.i. cat. e.d..that. ;c. rtices of r

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for the American National Standards, Institute.. Specification ;3. 2T.1.

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M. These vashers also : met the requirements for an acceptable decarburised :ene and

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I vasher..

A. pprox.1=s.te.1.7. 50 nev. *.as. h.er.s...ver.e.. sub.=. i.tte,d. for.,.. e.xarinat.i.o l

e= brittle =entt._ These, vashers' vere inspected, by, 36netic partici,e inspection.

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i us,ing a vet fluorescent method specified - by the, A=erican,, Society, for, Testing

,j and Mat.erials, Specific ation.I.13. 8.

T.he ::agnetic. par..ticl.e. i.n. spect..io..n.s.h.o. ved..n.o a

evidence of. surfa.ce indications.

.. A vasher. selected at random was sectioned and prepared for metall'ographic examination as shown by the two spect= ens in :this photograph.. ~ Meta 11ographici exa=ination' of the speci= ens revealed evidence cf e=brittled cracking at~ the surface which was finer than the detectable li=its of the ::agnetic particle inspection (arrov).

This is shown in more detail i= the next figure.

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_e 8 (66599) _.500.X_ _ _Et.ch_an_t:.Pi.er.ic Qd.r.och.l.ori.c _Ac.id_

1 This photomicrograph shevs the e=brittled structure found in a new washer.

E=brittled cracks extended to the surface and showed evidence. of secondar7 2. a. '.:.: ?.-

branching beneath the surface. # The crack shovn in this photoEraph-had a t depth ef. 0.010 of an inch.' ~ Cracks.of'.this sine vere n'ot/. detect'ed 'by nadetic indic~ateE" that'-

particle inspection;.1 Evidence of' this cracking on nev' vashers

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as delayed '; cracking the entire lot -of newPvashers should 4e.- rejected.,

rin' talled had not 'shovn-potenti=t can occur even' thou@. vashers' which vere s

j evidence of fracture.

The picric' hydrochloric etchant used for. preparation of this - metallo-on the surface.

The electrocinE graphic speci=en attacked the eine-coating

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plated layer is not visib'le in this nicrograph.

In addf. tion to the speci= ens of the electrecine plated vashers, a specimen of the ::echanically plated vasher was also metallographically exa=ined.

No t

s found on the mechan-..

evidence of incipient cracks or embrittled structure vere ical'.y plated vasher.

'Je. do act. knov at this time whether the mechanically as the vashers criginally supplied er heat j.

plated vasher was from the same lot and then later electrchine plated.

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