ML19209B031

Forwards CPC 790801 Interim Rept 2 Re Questionable Impact Test Results on Status of Main Feed Pipe Spools

ML19209B031
Person / Time
Site:	Midland
Issue date:	08/07/1979
From:	Gibbs M ISHAM, LINCOLN & BEALE
To:	Cowan F, Kornblith L, Smith I Atomic Safety and Licensing Board Panel
Shared Package
ML19209B032	List: ML19209B031 ML19209B052
References
NUDOCS 7910090024
Download: ML19209B031 (1)

Text

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ISHAM, LINCOLN & BEALE '

COUNSELCAS AT LAW Q N C FIR ST NATICNA L PLAZA FC RN*S COONO FLOC R OMacACO. lLLINCIS SC6C3

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'n:.sw Ivan W. Smith, Esq. Mr. Lester Kornblith, Jr.

Atoma.c Safety and Licensing Board Atomic Safety and Licensing Board U.S. Nuclear Regulatory Commission U.S. Nuclear Regulator *l Commission Washington, D.C. 20555 Washington, D.C. 20555 Or. Frederick P. Cowan 6152 N. Verde Trail Apt. B-125 Boca Raton, Florida 33433 Re: Consumers Power Ccmpany (Midland Plant, Units 1 and 2)

Docket Nos. 50-329, 50-330 Gentlemen:

Enclosed is a 550.55 (e) report which has recently been sub-minted by Censumers Power Company to the Nuclear Regulatory Commission.

Very truly yours, i11ffkE - Ic"s Martha E. Gibbs

.EG bc cc: Service List w/ enclosures 1119 297 g 024

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5=N Consumers (1W6l=W*' ', power Company

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Mr J G Keppler, Regional Directer

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799 Roosevelt Reed Glen Illyn, IL 60137 g y N

MIDLAND NUCLEAR PIANT UNIT NO 1, DCCKIT N0 50-329 UNIT NO 2, DCCKE2 NO 50-330 IMPACT TESTED - ITI GRIC':'". SUPPLIED MAI'i m PI?E -

Reference:

.S H Hcvell letter to J G Keppler; Midland Nuclear Plant; Unit No 1, Decket No 50-329; Unit No 2, Docket No 50-330; I= pact Tested - ITI Grinnell Supplied Mai: Feed Pipe; The referenced letter and this letter are interi: 50 55(e) repcrts en the ,

status of Main Feed Pipe Spcols which have cuestionable impact test results.

Attachment (1) is Censu=crs Pcuer Cc=pany's statement of the status of activities associated with the spools which was derived frc: the referenced letter and frc= the additional basic data given in Sechtel's MCAR Interi:

Report, provided as Attachment (2) .. .

Another report, either interi: cr final, will be previded by Septe=ber 7, 1979 q

] e,, q Attachments: (1) Consumers Fever Cc=pe:.y's Statement of the Status of Action Asscciated 'a'ith 2-G d --a Supplied Main Feedvater ?ipe Spcels (2) MCAR-29, Interi: Reper No 2, dated July 26, 1979 jO 2 ?d CC: Director of Cffice of nspecticn & Inforcement r spj Att: Mr 71000: Stelle, USNRC (15) 1

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Director, Office of Management (dS 3IOO Infor=ation sai Pregre= Ccntrcl, USNRC (1) bOhb Sh

2CC: JL3acen, M-1035A 3'44nrguS110 s 1 ~"-~~m^.

RCBat=an, P1h hl2 Innlicr, ISdl3:d WR31rd, JSC-2163 W!oring, Sechtel AA -

AJBirkle, P24-311 JFNevgen, 3achtcl-Midland Teuteberg, P14 4 10 RLCestleberry, Eechtel AA JLCorley, Midland ibbs, M _

LADreisbach, Ecchtel-Midland File: 0.4 9 41

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P00R ORBEL re" Hove 215-79 COUSUMERS P0iiER C0"PANY'S STA""i2CT ,

CF THE STATUS OF ACTION ASSCC!ATED WITH ITT-GRINN"~ SUPPLIED MAIN m4Am ?I?E SPOOLS The purpose of this attach =ent is to provide a su==ary of the sequence of events that are associated with each of the heats of piping.spcols. O.is data is taken frc= Attach =ent Ho 2 and Censu=ers Fever Cc=pany's previously referenced letter.

A. Heat N-327e2

1. One set of Charpy i= pact speci= ens were taken, but vere not valid because they were obtained frc= an inecrrect location.

2. The first set of valid test speci= ens vere obtained. For the

=aterial under censideration, the ASME acceptance criteria required three full-sized speci= ens be tested and that each speci=en have a =1:1=:=2 test result of 25 =ils lateral expansion.

The test results were 21, h0 and h5 s lateral expansion (at the required +30*? te=perature) and the test was unacceptable.

3 The ASME Ccde allevs one retest at the sa=e test te=perature

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criteria:

a. the average result o' all three initial test specimens =eets the =ini=u= require =ent

b. not =cre than one of the original speci= ens was belev the

=ini== require =ent

e. the specimen, which failed, was not =cre than 5 =ils belev the specified require =ent.

3ased en the results of the crig*- ' test (see A.2) ene retest,

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censisting of tvc additienal speci= ens taken as near as pessible to the failed speci=en, was alleved. To be acceptable, bcth of the additional speci= ens =ust =eet the original ' '-"- -aquire=ent.

The retest results were 13 and 25; therefore, the retes: vas unacceptable.

h. Subsequen: Oc the tests described in A.2 and A.3, IT Grinnell perfer=ed. Cha py i= pac

• testing en aucther set cf speci= ens at its evn laborate 7 ~he results obtained vere 29, 30 and 32 nils lateral expancien and the heat of asterial was accepted by :Z Grinnell en the basis of this test. he ASI'E Ccde does not allev

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require =ents. It is Censu=ers ?cve- Oc=pany's interpretatien that a third set of i= pact speci= ens vculd be acceptable (per SA-l^6/

SA-530) if a ther=al heat treat =ent was first performed tc i=preve the fracture properties of the as-rolled =aterial.

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Attach =ent 1 Page 2 Hove-215-79 5 One spool of =sterial frc= this heat later required het bending and was subsequently stress-relieved. Charpy-i= pact speci= ens obtained frc= this spec 1 vere 6, 9, and 17 =ils lateral expansion, which is unacceptable.

3. Heat L-20h*9

1. An initial set of Charpy i= pact speci= ens were tested to the sa=e ASE acceptance criteria given in A.2. '"he test results vere 13, 14 and 32 =ils lateral expansion and the test was unacceptable.

2. Based on the test results of 3.1 and the criteria given in A.3, no retest should have been alleved because the origint.1 speci= ens failed to =eet all three criteria needed to all:v a retest. I""

perfomed a second Charpy i= pact test (with three speci= ens si=ilar to an initial test versus two speci= ens required in a retest) . ~he results of the seccnd set of tests were 23, 31 and h3 =i'.s lateral expansion and this test was also unacceptable.

3 This heat was subsequently stress-relieved to i=preve fracture properties of the as-relled =aterial and retested with a new set of three Charpy i= pact speci= ens. *he test results a'ter stress-relieving vere 29, 29 and 30 d's lateral expansion. S.ese test re'sults vere abcve the =ini=u= require =ent and the heat was then

. ecasidered acceptable in the stress-relieved condition.

h. The results of the post stress relief tests described in A.5 indicates that stress-relieving does not always i= prove the Charpy i= pact results. 3ecause of this, I"" Grinnell no longer believes that =aterial stress-relieved and tested per 3.3 can be considered acceptable.

C. Other ? ire Secols 'a'ith Ec: 3ent Sections 3ecause of the unacceptable results obtained frc= het bent and stress-relieved specl described in A.5, the acceptability of all other spcols which vere hot bent 3.nd stress-relieved is being investigated.

D. Status of !dentification of Material Under !nvestintien

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N-32762 and 1-20k 9 have been identified.

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h. An investigation is being nade to identi*y piping speels, frc=

heats other than IT-327c2 and L-20h79, which were hot bent and stress-relieved.

This attach =ent atte= pts to present the raw data presently available and is not =eant to offer any conclusiens at this ti=e.

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i, Attach =ent 2 Howe-215-79 Bechtel Associates Professional Corporation Attach =cn: to 3LC-7942 .

SUBJECT:

MCAR 29 (issued 7/13/79) .

I= pact Testing of Main Feedwa:er Pipe INTERIM REPORT 2_

DATE: July 26, 1979 PROJECT: Consu=ers Power Co=pany Midland Plan Units 1 & 2 Bechtel Job 7220 Status of Correc:ive Action and Investication The status of actions in progress for resolution of the subj ect MCAR is as follows.

1) Bechtel has reviewed, at Grinnell, 70 spool data packages for i= pact test properties on certified =sterial test reports in the follcwing size range: 14-inch, 18-inch, 26-inch, and 36-inch dia=eter pipe. This review covered all =aterial requiring Charpy i= pact testing. This action was taken to deter =ine whether addi:icnal material, other chan tha: identified in MCAR 29, =et specifica: ion and ASME See:ica III, Class 2 code require =en:s.

The spools were f abricated fro: a total of 16 heats. Of these heats, :wo =aterial tes: reports for Heats N-32762 and L-20479 contained questionable data. Hea: N-32762 was considered ques:ionable because Grinnell perfor=ed = ore than one retest, which is not allowed by ASME Section III, Class 2 code.

Grinnell has agreed that the original Charpy :es: results (+30F) sub=1: ed for Heat N-32762 are not valid under ASME III, Class 2 require =ents in the as-received condition. Grinnell had perfer=ed a Charpy tes: (-307) for tha =aterial of :his heat in the stress-relieved condi:icn but 1: had failed.

Grinnell was requested to furnish 1:s rationale for acceptance of the i= pact tes: resul:s en Hea: L-20479 in the s:ress-relieved condition. Grinnell's ra:icnale was based en its e:cperience :hst a suberitical (1100-1200?) hea: trea:=en: has :he effec: of reducing the spread of :oughness values (s= aller variances) and sligh:17 i= proving la:arni expansien vclues :hrough a sof:ening =cchanis= (a slightly reduced yield poin:). The re:es: of Hea: L-20479, af:c stress-relieving, =c: :he code i= pac: :es: requirc=en:s. Ecwever, i119 303