ML20116G455

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Forwards Preliminary Summary of IGSCC Insps During Mar-Apr 1985 Outage, Per 840419 Generic Ltr 84-11, Insps of BWR Stainless Steel Piping. Improvements Made in Techniques Used to Detect Size Pipe Cracks Attributable to IGSCC
ML20116G455
Person / Time
Site: FitzPatrick Constellation icon.png
Issue date: 04/26/1985
From: Bayne J
POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To: Vassallo D
Office of Nuclear Reactor Regulation
Shared Package
ML20116G461 List:
References
GL-84-11, JPN-85-35, NUDOCS 8505010503
Download: ML20116G455 (2)


Text

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4# Authority April 26,1985 JPN-85-35 Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Mr. Domenic B. Vassallo, Chief Operating Reactor Branch No. 2 Division of Licensing

Subject:

James A. FitzPatrick Nuclear Power Plant Docket No. 50-333 IGSCC Inspection Summary March - April 1985 Outace

References:

1. USNRC Generic Letter No. 84-11,

" Inspections of BWR Stainless Steel Piping" dated April 19, 1984.

Dear Sir:

Attached is a report which summarizes the results of the Authority's recently completed IGSCC (Inter-Granular Stress Corrosion Cracking) inspection at the FitzPatrick plant.

Since these inspections were last performed in October of 1984, significant improvements have been made in the techniques used to detect and size pipe cracks attributable to IGSCC. Of the six indications discussed in the attached report, four have shown no growth. The remaining two indications show apparent crack growth.

Based upon a comparison of techniques used in October 1984 with the newer, improved techniques, this apparent crack growth is solely attributable to the increased sensitivity of the new techniques.

However, the Authority will use the larger, more conservative indication dimensions in any analyses performed and as a basis for future inspections until further information is developed to support the use of less conservative (smaller) crack dimensions.

New analyses will be performed for weld numbers 12-4, 12-17, and 28-112 to justify continued plant operation without repair.

Inspection data for each of the welds shown on Table No. 1 will be sent to you under separate cover. Inspection data on weld No.

22-22, and flaw analyses and overlay design reports will be transmitted in the near future.

Ok 333 I l

PDR

If you have any questions, please contact Mr. J. A. Gray, Jr. of my staff.

Very truly yours, J .' Ba ne Fi/stExecuti]veVicePresident Ch'ief Operations Officer cc: Office of the Resident Inspector (with enclosure)

U.S. Nuclear Regulatory Commission Post Office Box 136 Lycoming, N.Y. 13093 Mr. Robert McBrearty (with enclosure)

U. S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia. PA