ML20112D194

Significant Deficiency Rept 414/84-23 Re QA Review & Approval of Weld W/O post-weld Heat Treatment.Initially Reported on 841119.Weld 2CA93-1 Received post-weld Heat Treatment & Personnel Cautioned

ML20112D194
Person / Time
Site:	Catawba
Issue date:	12/19/1984
From:	Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
414-84-23, NUDOCS 8501140124
Download: ML20112D194 (3)

Text

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, DUKE POWER GOMPANY h 'L. .O. Box 33180

• • C LOTTE. N.O. 28242 HALH. TUCKER b ]i

• m ers.own m2."(('""=,,, December 19, 1984 (*) " **~*"

Mr. James P. O'Reilly, 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 No. 50-414 Significant Deficiency No. 414/84-23

Dear Mr. O'Reilly:

Pursuant _to 10 CFR 50.55(e), please find attached Sifnificant Deficiency Report No. 414/84-23 concerning absence of post-weld heat treatment.

Very truly yours, d V Hal B. Tucker LTP:scs Attachment cc: Director Robert Guild, Esq.

Office of Inspection & Enforcement Attorney-at-Law U. S. Nuclear Regulatory Commission P. O. Box 12097 Washington, D. C. 20555 Charleston, South Carolina 29412 d

INPO Records Center Mr. Jesse L. Riley Suite 1500 Carolina Environmental Study Group 1100 circle 75 Parkway 854 Henley Place Atlanta, Georgia 30339 Charlotte, North Carolina 28207 Palmetto Alliance NRC Resident Inspector 2135 Devine Street Catawba Nuclear Station Columbia, South Carolina 29205 8501140124 841219 PDR ADOCK 05000 OFFICIAL. COPY S

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DUKE POWER COMPANY CATAWBA NUCLEAR STATION REPORT NUMBER: 414/84-23 REPORT DATE: December 19,1984 FACILITY: Catawba Nuclear Station - Unit 2 ,

IDENTIFICATION OF DEFICIENCY:

Weld 2CA93-1 had been final QA reviewed and approved without having re-ceived Post Weld Heat Treatment as required by ASME Section III. This was identified on Nonconforming Item Report 19073.

INITIAL REPORT:

On November 19, 1984, C. Burger, NRC Region II, Atlanta, Georgia, was notified of the subject deficiency by D M Collings, RL Williams, and L M Coggins-of Duke Power Company, Charlotte, North Carolina 28242.

DESCRIPTION OF DEFICIENCY: -

On October 17, 1984, during a review of completed documentation it was di:; covered by Welding Technical Support and QA Inspections that weld-2CA93-1 had been final QA reviewed and approved without having received Post Weld Heat Treatment.

On December 3,1984, Construction developed a list by means of a computer printout of all Duke Class "B" and "F" welds requiring Post Weld Heat Treatment for Catawba Units 1 and 2. Additionally, from a review of Con--

struction piping isometrics, Design and CNF0 drawings, a list was developed of all other welds requiring Post Weld Heat Treatment that includes all generator nozzle welds- (P-1 to P-3), guard pipe attachment welds, and NSSS support welds.

The process control for each weld was reviewed to insure that PWHT was specified on the process control and then completed. This review .encom-passed 100% of the welds requiring PWHT at Catawba Units 1 and 2 (424).

Post Weld Heat Treatment for each weld was specified on the process con-trol; satisfactorily performed; and verified by QA Welding- Inspection.

Currently, there are' no outstanding Code (ASME or ANSI) welds requiring PWHT remaining at Catawba.

ANALYSIS OF SAFETY IMPLICATIONS:

Had the absence of Post Weld Heat Treatment gone undetected, it could have resulted in a weld which did not meet minimum requirements. Lack of post weld heat treatment could' produce a harder (i.e., less ductile)

. heat effected zone. This harder material could develop cracks under adverse conditions. However, if cracks should occur, there would be no impact on public safety and the Unit could be shut down safely in this case.

o CORRECTIVE ACTION:

As a result of the investigation, it can be concluded that this was an isolated oversight and that no generic implications exist with regard to this item.

In accordance with the specified action on NCI 19073, weld 2CA93-1 has received PWHT and all responsible personnel have been cautioned to be more proficient in the peformance of this function.

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