ML20027B144

Final Significant Deficiency Rept SD 413-414/82-02 Re Deficient Welds on Miscellaneous Steel Structures.Initially Reported on 820125.Caused by Poor Workmanship.Welds Reinspected.Sufficient Design Margins Exist

ML20027B144
Person / Time
Site:	Catawba
Issue date:	09/01/1982
From:	Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8209160475
Download: ML20027B144 (3)

Text

.

t DUKE POWER GO)mANY l'.O. IK)x 33180 CliA14LOTTE, N.G. 28242 IIAL 11. TUCKER TELEPHONE vu.srarmormt (704) l17:1-45:31 mraman enonarrion September-1, 1982 Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region 11 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re: Catawba Nuclear Station Units 1 and 2 Docket Nos. 50-413 and 50-414

Dear Mr. O'Reilly:

Pursuant to 10 CFR 50 55e, please find attached a final response to Significant Deficiency Report SD 413-414/82-02.

Very truly yours,

'& / .c Q.

Hal B. Tucker RWO/php Attachment cc: Director Mr. Robert Guild, Esq.

Office of Inspection and Enforcement Attorney-at-Law U. S. Nuclear Regulatory Commission 314 Pall Mall i Washington, D. C. 20555 Columbia, South Carolina 29201 Mr. P. K. Van Doorn Palmetto Alliance NRC Resident inspector 2135 Devine Street

. Catawba Nuclear Station Columbia, South Carolina 29205 l

l l

t

! ()r,.

r b-0209160475 B20901 PDR ADOCK 05000413 S (( ll l

, , - , , . - - -. . - , .- - . - , . - , - . , - . = - - - - - - - _,-. - ,,

• CATAWBA NUCLEAR STATION Reoort No: SD 413-414/82-02 Final Report Date: September 1, 1982 Facility: Catawba Nuclear Station Units 1 and 2 Identi fication of Deficiency: Some welds previously ccmpleted on miscellaneous steel structures were found not to meet the re-quirements of the design drawing or the inspection procedure, QAP M-21.

Ini tial Report:

On January 25, 1982, J Bryant of Region 11, Atlanta, Georgia was notified of the deficiency by W 0 Henry and J H Lanier of Duke Power Company, 422 South Church Street, Charlotte, NC 28242. The 30-day report required by 10CFR50.55e was submi tted on February 23, 1982.

Final Report:

This final report is submitted to provide additional details re-garding the cause of the deficiency, corrective actions taken, results achieved, and additional corrective measures planned.

The cause of the deficiency has been determined to be poor workman-ship followed by inadequate inspections in the past. In addition, some of the welds are suspected not to have received a final weld inspection. Documentation does not exist to verify that the welds received an inspection. A heightened awareness of the strict code and design requirements and the use of more sophisticated inspection tools has contributed to these findings.

Action Taken To Date is as Follows:

1. Sixty-four welds on structural platforms were reinspected af ter removal of paint. The results were presented to Design Engineering for evaluation. Although the welds were not in strict compliance with code and design requirements, Design Engineering was able to make the determination that the deficient welds were not of safety-significance. In addition, Design Engineering concluded that similar weld defects occurring on other structural platforms would

. *$* rasult in minimal dacretsa in captcity and would not ba of safety

~

significance. No further inspections are planned on structural platforms.

2. One hundred and twenty-one welds on pipe rupture f rames were reinspected (34 af ter removal of paint, 87 wi thout removal of paint) .

The results were submitted to Design Engineering for evaluation. The design evaluation concluded that sufficient design margins did not exist to include all deficiencies noted. Based on the design evaluation, all field welds on pipe rupture frames will be reins 2ected without removal of paint.

3 One hundred and eighty-one welds on instrument tube supports were reinspected. The results reflect a high degree of quality, as only one weld defect was found. Quality Assurance concluded that the level of inspected quali ty was acceptable.

Additional Corrective Action Planned is as Follows:

1. Reinspect a sample of welds in each of the following generic areas to determine the level of quality.

Electrical Equipment Mountings Electrical Cabinet / Panel Fabrication Electrical Cable Tray Hangers Electray Hangers Equipment Supports Tube Steel Cable Tray Grid Blockwall Structural Steel These reinspections will be performed without the removal of paint.

Results will be evaluated by Design Engineering to determine the need for additional inspections. The reinspections and resulting evaluation will be completed prior to fuel loading.

2. Institute a program for verifying and documenting that welding inspections are performed on all QA Condition 1 and 4 welds. This program will be implemented by October 1, 1982.

l l

r l

l l

l l

L

__