ML20128B729

Significant Deficiency Rept SD 414/85-04 Re Stainless Steel Valve 2NC220 Incorrectly Shown as Carbon Steel on Const Isometric.Initially Reported on 850419.Incorrect Valves Cut Out & Rewelded Properly.Personnel Trained

ML20128B729
Person / Time
Site:	Catawba
Issue date:	04/19/1985
From:	Tucker H DUKE POWER CO.
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
SD-414-85-04, SD-414-85-4, NUDOCS 8505280039
Download: ML20128B729 (3)

Text

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i DUKE POWER GOMPANY P.O. DOx 33189 oHAMLOTTE, N.o. 28242 MALB. TUCKER ruter. cosen v==r=======

(704) 070-6801

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L GdPfd,51955l l l4 Dr. J. Nelson Grace, Regional-Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 RE: Catawba Nuclear Station, Unit 2 Docket Nos. 50-414 Significant Deficiency No. 414/85-04

Dear Dr. Grace:

Pursuant to 10CFR 50.55(e), please find attached Significant Deficiency Report

~No. 414/85-04.

Very truly yours, Jus.L/

Hal B. Tucker LTP/mjf Attachment cc Director Mr. Robert Guild, Esq.

Office of Inspection and Enforcement Attorney-at-Law U. S. Nuclear Regulatory Commission P. O. Box 12097 Washington, D. C. 20555 Charleston,' South Carolina 29412 NRC Resident Inspector Catawba Nuclear Station Mr. Jesse L. Riley Carolina Environmental Study Palmetto Alliance Group 2135h Devine Street 854 Henley Place Columbia, South Carolina 29205 Charlotte, North Carolina 28207 INPO Records Center Suite 1500 1100 circle 75 Parkway Atlanta, Georgia 30339

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Report Number:

SD 414/85-04 Report Date: April 19, 1985 Facility: Catawba Nuclear Station Unit 2 Identification of Deficiency:

During a QA departmental audit, it was discovered that valve 2NC220 was a stainless steel valve which was shown as carbon steel on the construction isometric.

This error was documented on Nonconforming Item Report #19213.

Initial Report:

On April 19, 1985, Kenneth Jension, NRC Region II, Atlanta, Georgia was notified of the deficiency by R L Williams, L M Coggins, TL Utterback of Duke Power Company, 422 S. Church St.,

Charlotte, NC 28242.

Component and/or Supplier:

Fabricated by Duke Power Company, Catawba Nuclear Station.

Description of Deficiency:

A stainless steel valve was incorrectly shown as carbon steel on the construction isometric. An investigation to determine if the valve was correctly welded was initiated. This investigation revealed that carbon steel filler material was used to weld the valve in place.

This condition is unacceptable for a stainless steel valve body.

This prompted a further review of all valves used in bi-metallic applications.

Approximately 1500 valves were reviewed for both units.

From this review, nine valves in Unit 2 were found to be shown with incorrect material type on the construction isometric.

After the weld metal was examined, it was determined that 3 of the 9 valves had to be cutout, refurbished, and reinstalled with the correct filler material.

Analysis of Safety Implications:

One of the improperly made welds was cut out and evaluated by Design.

It was found to have a high residual stress level and exhibited a decrease in ductility.

This could have rendered the welds unsuitable for the intended service due to fatigue and/or brittle failure.

With postulated weld failures of the Unit 2 welds involved, a signi-ficant fire hazard could have existed in the Reactor Building and Diesel Generator Room 2B due to oil spillage.

Corrective Action:

This problem was initially evaluated per Nonconforming item Report

1. 19213.

The applicability of the situation to other sites, and corrective actions required were addressed on Significant Corrective Action #1150.

The corrective actions taken are as follows:

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1) A review of stainless steel valves was made to insure that they were welded using proper procedures and filler material.

2) Three~ valves were cut out and rewelded properly.

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-3) All personnel who originate, -revise, or approve construction isometrics.were trained (March -8, 1985) to use manufacturers drawings, which are -controlled documents, for determining material type for valves.

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