ML20091B787

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Provides Status of GE Svc Info Ltr 402 Re Vent Header Cracking Incident.Recommended Ultrasonic Testing Not Planned Due to Lack of Baseline Test Data.Cracking from Injection of Cold Nitrogen Detectable by Surface Exam
ML20091B787
Person / Time
Site: Hatch  Southern Nuclear icon.png
Issue date: 05/23/1984
From: Gucwa L
GEORGIA POWER CO.
To: Stolz J
Office of Nuclear Reactor Regulation
References
NED-84-270, TAC-54150, NUDOCS 8405300395
Download: ML20091B787 (1)


Text

Georg:a Power Company '

333 Piedmont Avonue Atlanta. Georg a 30308 Te'ephone 404 5264526 Mai:ng Address; Post Oft:ce Box 4545 Atlanta, Georgia 30302 Georgia Power L T. Gucwa the southem elect c system Manager Nuclear Engineenng and Chiet Nuclear Eng neer NED-84-270 May 23, 1984 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch No. 4 Division of Licensing U. S. Nuclear Regulatory Ccanission Washington, D. C. 20555 NRC DOQ TIS 50-321, 50-366 OPEPATING LICENSES DPR-57, NPF-5 EDWIN I. HAICH NUCLEAR PIANT UNITS 1, 2 STATUS OF SIL 402, "WE'IEEII/DRYhTIL INERTING" Gentlenen:

Service Information Letter (SIL) 402 was issued by General Electric Cmpany in response to the vent header cracking incident at Hatch Unit 2.

In a letter dated April 5,1984, Georgia Power Cmpany (GPC) reported the status of cmpliance with the reccmnendations of SIL 402 at Plant Hatch.

With respect to Peccmnendation 4, " Inspect Nitrogen Injection Line", it was stated in our April 5,1984 letter that visual exanination and limited magnetic particle testing had been performed on the applicable lines, but that the reccmnended ultrasonic testing was not planned due to the lack of baseline test data. It was further stated that alternative inspection techniques were being considered.

GPC has determined the inspections already performed to be adaluate.

Any cracking which could result from the injection of cold nitrogen is expected to be through-wall and detectable by surface examination.

Therefore, further inspection of the nitrogen injection lines is not planned.

We also note that an error was made in the April 5,1984 letter. The setpoint for the low tenperature nitrogen supply shutoff was specified as 500F, but is actually 300F.

'Ihis sutmittal cmpletes GPC's response to the NRC concerning SIL 402.

Please contact this office at your earliest opportunity if there are any questions.

Very truly yours, 8405300395 840523 PDR ADOCK 05000321 S PDR

[7'& m L. T. Gucwa JH/mb xc: J. T. Beckhan, Jr.

H. C. Nix, Jr.

J. P. O'Reilly (NRC- Region II) Ig Senior Resident Inspector