PLA-2120, Interim Part 21/deficiency Rept Re Base Metal Cracking in Fittings Used on Class IE Electrical Raceways & HVAC Supports.Initially Reported on 840206.Final Rept Expected Prior to Initial Criticality

Interim Part 21/deficiency Rept Re Base Metal Cracking in Fittings Used on Class IE Electrical Raceways & HVAC Supports.Initially Reported on 840206.Final Rept Expected Prior to Initial Criticality

ML20087P738
Person / Time
Site:	Susquehanna
Issue date:	03/07/1984
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
REF-PT21-84-451-000 PLA-2120, PT21-84-451, PT21-84-451-000, NUDOCS 8404090326
Download: ML20087P738 (4)

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PPat Pennsylvania Power & Light Company Two North Ninth Street

• Allentown, PA 18101

• 215 / 770 5151

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Norman W. Curtis -

' Vice President-Engineering & Construction-Nuclear

.215/770-7501 MAR l071984

-Dr. Thomas E. Murley_

Regional Administrator, Region I U.S. Nuclear Regulatory Commission.

631 Park. Avenue 7 King of Prussia, PAJ 19406 SUSQUEHANNA STEAM ELECTRIC STATION INTERIM REPORT'ON A DEFICIENCY INVOLVING '

EBASE' METAL CRACKING IN. ANGLE FITTINGS ER 100508 FILE 821-10 PLA-2120 Docket No. 50-388 T

Dear Dr. Murley:

T This letter. serves to provide the Commission with an-interim report on a deficiency involving _ cracking in the base. metal of angle fittings used on Class IE electrical' raceways and HVAC_ supports. This deficiency was reported Junder 10CFR50.55(e) as'potentially reportable by telephone to Mr. G. Kelly of NRC Region I by.Mr..'R. M.-Harris of PP&L,on February 6, 1984.

The attachment to'this letter contains a description of the problem, its

.'cause, the safety implications, and the corrective action.

KSince the details of this_ report provide information relevant to the reporting requirementsLof 10CFR21.for Unit 2,.this correspondence is considered to also discharge any.. formal. responsibility,PP&L may have for reporting in compliance thereto.

-We expect to prov.ide a_ final report-on this deficiency prior to Unit 2 initial

- criticality. We trust;the Commission will find this report to be

-satisfactory, rf 'Very truly yours, L:n .

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N. W.~Curtis

'L iVice. President-Engineering &'_ Construction-Nuclear Attachment q'

-8404090326'840307 .

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' MAR 07:1984 Page 2 SSES PLA-2120 ER 100508 File 821-10 Dr. Thomas E. Murley Copy to:

Mr._ Richard C. DeYoung~(15)

Director-Office of Inspection & Enforcement.

'U.S. Nuclear' Regulatory Commission Washington,'D.C. :20555 Mr._G._ Mcdonald, Director

. Office of Management Information & Program Control

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.U.S.' Nuclear Regulatory Commission

Washington, D.C. .20555~

-Mr. R. H 'Jacobs U.S. Nuclear Regulatory Commission P.O. Box 52 Shickshinny, PA- 18655 Records Center Institute of-Nuclear Power Operations

.1100_ Circle 75-Parkway, Suite 1500 Atlanta..CA 30339' v-

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1 INTERIM REFORT

' SUBJECT'

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Base metal ~ cracking of angle fittings used 'for seismic class 1E raceway

, supports and seismic category I~HVAC duct supports located throughout

Susquehanna Steam' Electric Station, Units 1-and 2. -The fittings were supplied by Unistrut, Powerstrut, B-Line and others.

LDESCRIPTION "BEchtel Power (Corporation informed PP&L of a base metal cracking problem with angle1 fittings used on 'other Bechtel projects. ~Seven (7) samples were then

tested from the warehouse at the jobsite. -Non-destructive examination indicated the existence ofilinear indications in two samples.

The fittings of concern are 1-5/8 inch wide by 1/4 inch thick with legs-ranging from 2-1/2 to 5 inches. The angle.between the legsuis less than 90

~ degrees. The cracking has occurred at the inside of the bend.

1The: extent of the' problem is unknown. To the best of our' knowledge, the above described cracking was not observed-during installation at Susquehanna Steam Electric: Station.

JCAUSE '- V

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s During. fabrication, ASTM A575-flat plate is cold bent to ;ut acute (less than 90 degrees)' angle.. Although ASTM A575 allows for cold bending, a moderate

-bendtradius is required. :The fittings are bent to'a sharp radius and in fact the . bend may have no radius at all. . Therefore, the fittings are. subjected to severe cold working causing the unkilned material to become strain age embrittled.- -If, during -installation the angle fittings are subjected to

. reverse' bending by forcing the angle legs' apart, the. angle bend may crack on

=the inside radius.-

SAFETY IMPLICATIONS

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< Cracking of-the' angle fittings may, impair their ability to provide the required support'under seismic loads. An investigation is in progress to determine:

(1).1The' extent of.the. cracking.-

'(2) .The. impact on the load carrying capability of the fitting angle.

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The results of this investigation will be used to' determine reportability for

. Unit I under Part 21.

CORRECTIVE-ACTION sAs: indicated above an-inspection and testing program 1s in progress.

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75 i fittings from~ Unit 1.and-75 from Unit 2 were chosen at random for inspection.

Th'e inspection of the:75' fittings on' Unit 2 is complete. 28 of the 75 fittings had.~ indications and these 28~are being fatigue ~and static tested.

Preliminary:results of this testing do not indicate a significant reduction in

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, (the. load carrying capability'as a result of the indications.

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, The inspection.of the 75-fittings on Unit I will be complete by March 19, i x1984 .

PP&L expects to issue a. final report with the final results of the inspections and; testing prior to Unit 2 initial criticality.

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