ML20050A892

Interim Part 21 Rept Re 1/2-inch & 3/8-inch Plates Used in Category 1 Seismic Supports,Initially Reported 820310. Supports Containing 3/8-inch Plates Examined & hands-on Search of 1/2-inch Matl Conducted.Reportable Per Part 21

ML20050A892
Person / Time
Site:	North Anna
Issue date:	03/12/1982
From:	Leasburg R TENNESSEE VALLEY AUTHORITY, VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-82-597-000 10CFR-50.55E, 157, PT21-82-597, PT21-82-597-000, NUDOCS 8204020371
Download: ML20050A892 (3)

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Mr. James P. O'Reilly Serial No. 157 Regional Administrator N0/ Jill:acm U. S. Nuclear Regulatory Commission Docket No. 50-338 Region II License No. NPF-4 101 Ma riet ta St reet , Suite 3100 Atlanta, Georgia 30303

Dear Sir:

Under the provisions of the Technical Specifications and 10 CFR 21, NRC Region II was notified on March 10, 1982 that a potential significant deficiency or substantial safety hazard existed at North Anna Unit 1.

In accordance with the reporting requirements of 10 CFR 21, the following information is submitted:

A. Name and address of reporting individual:

Mr. R. H. I,casburg, Vice President Nuclear Operations Virginia Electric and Power Company P. O. Box 26666 Richmond, Va. 23261 11 . Facility, activity, and/or component affected:

North Anna Power Station, Unit 1 Category 1 Seismic Supports Constructed via DCP 80-S46 and DCP 80-S31.

C. Name of firm supplying the component.

1/2" Plate: Steel Service P. O. Box 9199 Richmond, Va. 23227 3/8" Plate: Edgecomb Metals P. O. Box 6055 Philadelphia, Pa. 19114 D. Description of defect, deficiency, or failure to comply:

A quantity of 1/2 inch and 3/8 inch plate was purchased to ASTM A-36 and was used in a number of Category 1 seismic supports constructed under design change packages DCP 80-S46 and DCP 80-S31 during the Unit 1 September 1981 outage. The material was purchased with a Certificate of Conformance to the applicable ASTM standard. In addition to the certification of conformance provided by the suppliers, North Anna Station Specifications required that aOFFICIAL COIT, 8204020371 820D 12 -

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James P. O'Reilly vmoim Etectmc m powen coum, to Certified Material Test Report be performed on the subject material.

This certification was not found during a QC review. Subsequently, samples of the material were sent to Newport News Industrial ,

Corporation and Pittsburg Testing Laboratory for verification of l compliance to ASTM A-36. The test reports which showed that the  ;

material did not conform to ASTM A-36 were received af ter the scismic pipe supports had been fabricated and installed in the plant.

The 3/8 inch plate was purchased as ASTM A-36 which is required to have a minimum yield stress of 36,000 psi. Samples of the plate tested at the aforementioned laboratories indicated yield stresses of approximately 31,000 psi.

Eleven seismic supports modified in DCP-80-S46 were identified as possibly containing material from this 3/8 inch plate. Two have been verified to contain the non-conforming material. The investigation continues at this time to confirm if the remainder of the supports contain the affected material.

The 1/2 inch plate, tested at Pittsburg Testing Lab, indicated a r tensile strength of 87,700 to 97,700 psi which exceeds the allowable values of 58,000 to 85,000 psi. The problem with the high tensile strength of the 1/2 inch plate is that the welding procedure which was used may not be acceptable. Of the 19 supports (8 for DCP 80-S46 and 11 for DCP 80-S31) originally identified as possibly containing this 1/2 inch plate, 3 have been confirmed to not contain the material. The investigation is continuing to determine if any of the remaining supports contain this material.

E. Date of discovery:

March 8, 1982 F. Similar components, activities, or services:

Not applicable G. Corrective Action which has been, or is being or will be taken, the individual responsible and the length of time to complete the action.

Seismic supports containing 3/8 inch plate fabricated for DCP 80-S46 are being examined to determine if the unacceptable material has been used. Stone and Webster is also reanalyzing the supports using a lower yield stress of 31,000 psi verses the previously assumed value of 36,000 psi. The two hangers which have been confirmed to contain the affected material have been reanalyzed and determined to be acceptable.

l l For the suspected seismic supports that may have been fabricated of unacceptable 1/2 inch material for DCP 80-S46 and 80-S31, a hands-on scarch is being conducted to confirm the identification of the material. Samples were sent to Newport News Industries for a 1

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Viuoswir Etectnic Amp Powru Cowravy To ws . O'hilh complete chemistry analysis to determine the chemical constituents of the material and to verify the physical properties as reported by Pittsburgh Testing Lab. To date, it has been determined that the samples sent for analysis are of the same "lleat" as samples previously analyzed for the Certified Material Test Report from Pittsburgh Testing Lab. At the North Anna site, coupons of the affected 1/2 inch plate are being welded in all of the same configurations as were performed on the affected supports using the sane type welding rods and welding techniques. These sampics will be tested to determine whether the welding used on the affected 1/2 inch plate is acceptabic as installed.

11 . Other information Material ordered from Edgecomb Metals was procured under Vepco Purchase Order No. 50785.

Material ordered from Steel Service was procured under Vepco Purchase Order No. 50786.

Should you require further information, please con act this office.

Very tru y yours, R.

W I. Leasburg cc: Director, Office of Inspection and Enforcement (3 copies)

U. S. Nuclear Regulatory Commission Washington, D. C. 20555

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