ML19209B052

Interim Rept 2 Re Impact Testing of Main Feedwater Pipe Which Had Questionable Test Results.Corrective Action & Investigation Is Being Continued.Next Rept Will Be Submitted on 790823

ML19209B052
Person / Time
Site:	Midland
Issue date:	07/26/1979
From:	BECHTEL GROUP, INC., EECBECHA
To:
Shared Package
ML19209B032	List: ML19209B031 ML19209B052
References
HOWE-215-79, NUDOCS 7910090046
Download: ML19209B052 (6)

Text

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Bechtel Associates Professional Corporation Attach =cnt to 3LC-7942 MCAR 29 Inter 1= Report 2 July 26, 1979 Page 2 Grinnell concedes that its rationale, as de=enstra:ed by the resul:s of Heat N-32762 is not 1007. consistent, and as a result, it believes that other stress-relieved heats =ay also be suspect in relation to the repeatability of the i= pact properties on each piece of equip-

=ent.

Grinnell has rationali:ed that because it did not obtain i= proved Charpy test resul:s for Heat N-32762 stress-relieving, Heat L-20479 cannot be considered :o have the desired i= pact proper:1es (+30F) .

2) In May 1979, Grinnell tested'three samples of Heat N-32762. These sa=ples were fro = a f abricated spool whi.ch consisted of a s::aight piece of pipe which was hot-bent, air-cooled, and then full furnace stress-relieved. These sa=ples yielded resul:s of 9, 6, and 17 =11 lateral expansion. Because the sa=ples were taken near the area of the bend, it was thought that they =ay have been fres a heat-affec'ted :ene (an area which had received an inter:ediate heating and coc* ing cycle because of its proxi=ity to the hot bend area) .

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Grinnell has indicated that =easure=ent of the ac:ual sa=ple location relative to the area which was heated and bent, shows that it was not significantly heated during the bending cycle. Grinnell is preparing a graph of the ta=perature versus distance to show what these sa=ples would have been subject to during the bending cycle.

The graph will be used to deter =ine whether the sa=ples could have been affected by the bending operation.

Grinnell concluded that because the sa=ples were far enough frc=

the furnace cot to ha affected by 1:s hea:, the poor results are because of the material inconsis:ency associa:ed wi:h this particular heat. ,

3) Sechtel has performed a docu=enta: ion survey a: the jobsi:e to identify all spools Charpy tes: qualified in hea: ::aa:=en: condi:1on and to confir= tha: those spools identified were in f ac: hea:-

treated. The resul:s of this survey, as rela:ed :o Hea:s N-32762 and L-20479, are :abulated in the at: ached appendix.

Bechtel is s:111 pursuing the acceptabili:y of =a:erial associa:ed with Heats N-32762 and 1-20479 as well as any spools wi:h ho: bend sections. Therefore, the reportable condition of the pipe re=ains uncertain at this ti=c.

? 04 7910090 0

Bechtel Associates ProfessionalCorporation Attachment to 3LC-7942 MCAR 29 -

Interim Report 2 July 26, 1979 Page 3 Forecast Data for Investigation and Corrective Action The next interim report is scheduled for August 23, 1979'.

i Submitted by: b Approved by:, Co. ' /> <"

Concurre.nce by: )

ne</j s 7/12/9 .

O 1.11,9 c u i sos t.

Page 1 of 3 ,

' APPENDIX .

SLY. MARY OF FIELD DOCL7.E;TATION SURVEY FOR REA*S N-32762 AND L-20479 Charpy Tes: Results

- Heat N-32762 Spools Register CMTR Heat-Treated-

• 9 1EL32S638134 MP413 P142 'No-2EL315639133 MR416 P142 Yes .

2EL31S639133A MR416AX P142 Yes 2EL32S639133 IIR424 P142 Yes .

2EL32S639134 MR425 P142 Yes Test Result @ +30F '

As-Received Condition

~ 1s t 2nd 3rd 21 25 29 40 18 30 45 32 Passed s No No Yes

1. Heat trea =en: verification was based en review of actual decu=en-tation at the j obsi:e. Hea: trea:=ent censisted of post weld stres s-relieving.

2. This spool is currently on hold a: Crinnell Shop.

Secause che :hird :es a: 3CF is considered invalid, disposi:ica ef =a:crial is undeter=ined at :his ci=e. (See Code Acceptance Cri:eria for Charpy Impac: Tes: Resul:s.)

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Appendix Page 2 of 3

. Chdepy Test Results Heat L-20479 . .

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. Spools Register . CfrR Heat-Treated 1 1EL315638134 MP44 , P142 Yes 1EL315638136 M246 P142 Tes 2EL31S639135 MR418 P142 Yes 2ELB2S639135 ER626 P142 Yes 2ELES639136 MR427 P142 Yes Test Results +30F As-Received Condi:ien Stress-nelteved 11757

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1st 2nd 1st Tes:

32 31 30 14 43 29 13 23 29 Passed -

No No .

'Yes

1. Ecat treat =cnt verification was based on review of actual docu=en-tation at the j'obsite. Heat treat =ent censisted of post weld stress , relieving.

In accordance with code regula: ions ma:erial, this heat is considered acceptable in the stress-relieved condi: ion. Ecwever, because of incon-sistent results wi:h other hea:s af:er stress-relieving, Grinnell considers these resul:s. questionable. Disposition of :his =acerial is considered undetermined at this ti=e.

Spools Consis:ing of a Ccebination of Heats N-32762 and L-20479 3oools Racis:er CMTR Hea:-Trea:ed IEL315638133 M243 P142 Yes lEL325638133 MP412 P142 Yes lEL325638136 MP414 P142 Yes 3ecause these spools are combina:icas of unaccep able hea:s, : hey are not acceptable.

.. 7/12/9 , 1 1 '1 (l 7Il7

Appendix ,

g At ta c5cei.t to !)LC-79/.; Page 3 of 3

.  !! CAR 2') I!!T!'. RIP I4EPORT 2

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July 26, 1979 Page 6 Code Acceptance Criteria for Charpy Impact Results in Accordance with ASME Code,Section III,1971 Edition Through Su==c: 1973 Addenda

1) Acceptance tests consist of a set of three full-size speci= ens.

2) Specicens shall have a =ini=u= of 25 =il* lateral expansion.

3) Retests (Su==er Addenda,1973)

One retest per=itted at the sa=e te=perature provided:

a) Average values of the test results =eet the =ini=u= require =ents

"# i=u= require-b) Not = ore than one speci=en per test is below the ment c) Specimen not =eeting the =ini=u= require =ents is not icwer than 10 f t/lbs or 5 =ils lateral below specified require =ent d) A retest consists of two additional spec 1= ens taken as close

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as practical to the failed speci= ens. For acceptance of the retest, both speci= ens shall meet the -hu= require =ents.

e 1119 308 7/12/9