ML19261D789

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RO on 790618:radiographs Taken on 790615-16 & 18 of Three Steam Generator nozzle-to-feedwater Inlet Piping Welds Showed Cracking Present in Three Inlet Pipes.Addl Info & Corrective Action Will Be Provided in Followup Rept
ML19261D789
Person / Time
Site: Beaver Valley
Issue date: 06/19/1979
From: Werling J
DUQUESNE LIGHT CO.
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
BVPS:JAW:678, TAC-11766, NUDOCS 7906260397
Download: ML19261D789 (2)


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II$E# " DUQUESNE LIGHT COMPANY Beaver Valley Power Station Post Office Box 4 Shippingport, PA 15077 June 19, 1979 BVPS: JAW:678 Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 LER 79-14/01P Mr. B. H. Crier, Director of Regulation United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406 '

Dear Mr. Grier:

In accordance with Technical Specification 6.9.1.8.1, the following occurrence is reported. The report was discussed with Mr. D. A. Beckman at 1400 hours0.0162 days <br />0.389 hours <br />0.00231 weeks <br />5.327e-4 months <br /> on June 18, 1979.

On Iby 31, 1979 during a telephone conversation with Messrs. J. A. Werling, BVPS Unit 1 Superintendent, and A. C. Mazukna, Duquesne Light Company quality Control Supervisor, Mr. D. Beckman, NRC Inspector, discussed the finding of cracks in teedwater piping adjacent to the steam generator nozzle to feedwater piping weld at another power plant. Mr. Beckman asked if Beaver Valley Power Station would voluntarily radiograph those welds during the station's current shutdown. The BVPS F perintendent agreed to do so and the work was scheduled.

The radiographs were taken on June 15,16, and 18,1979, of the three steam generator nozzle-to-feedwater inlet piping welds.

The radiographs showed cracking to be present in all three inlet pipes.

Actually, the inlet piping at these locations are 90* elbows. The lines are 16 inches in diameter with an 0.843 inch wall thickness. In each instance, the cracks originated at the shoulder of the counterbore in the piping, or approximately 9/16 inch f rom the root of the weld, n

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Mr. B. H. Grier June 19, 1979 BVPS: JAW:678 Page 2 Measuring in a circumferential and clockwise direction and facing with ,

the flow, the specific locations and size of the cracks are as follcus. The measurements of 0 and 51 inches are at the top of the pipe; 13 at 90*; 25-26 at the bottom; and 38 at 270'.

Steam Generator No. lA Steam Generator No. 13 Steam Generator No. 1C Cracks were present at: Cracks were present at: Cracks were present at:

49 1/2" through 0 to 2" 48" through 0 to 2" 48" through 0 to 5" 10 1/2" to 15" 9" to 13" 26" to 30" in a suck-up 39" to 41" 33" to 43" area of the root pass 35" to 43" A magnetic particle examination of the affected areas did not show any cracking to be present on the outside surface of the piping.

Any additional information and corrective action will be provided in the followup report.

Very truly yours, SM

,', J. A. Werling Superintendent cc: Director Of Management & Program Analysis w' United States Nuclear Regulatory Commission Washington, D. C. 20555 D. L. Wigginton, BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, D. C. 20555 D. A. Beckman, Nuclear Regulatory Co= mission, King of Prussia, PA G. A. Olson, Secretary, Prime Movers Committee - EEI 2311 229 b