ML17252B443

LER 76-016-00 for Dresden 2 Regarding a Discovery of a Through-Wall Crack in the 14-Inch HPCI Sensitized Stainless Steel Safe-End

ML17252B443
Person / Time
Site:	Dresden
Issue date:	04/07/1976
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS Ltr. #76-290 LER 76-016-00
Download: ML17252B443 (3)

Text

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Commonwealth Ason Dresden Nuclear Pow~ation R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. #76-290 April 7, 19 76 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ell~n, Illinois 60137 Enclosed please find Reportable Occurrence number 50-237/1976-16. This report is being submitted to your office in accordance with.the Dresden Nuclear Power Station Technical Specifications, Section 6.6.B.

BBS:aw Enclosure cc: Director of Inspection & Enforcement Director of Manage*ment Information & Program Control Fiie/NRC

• ENSEE EVENT REPORT *

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1 6 LICENSEE LICENSE EVENT NAME , LICENSE NUMBER TYPE TYPE

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CAUSE DESCRIPTION

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EE]lololol11 7 89 NA 1~2~~~~~.-~~~~~~~~~~~~~~~~~~~~~~~~~~~ ............

80 OFFSITE CONSEQUENCES

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• 667

CAUSE DESCRIPTION (continued)

-1/4 in-ch- long -at the O.D: and 2 inches long at the I.D~, running circum-ferentially. Two axial cracks between 1/2 inch and 1 inch in length were also found on the I.D. surface, emanating from the safe ... end-to-pipe weld.

Analysis of the!?e cracks has not yee been completed. An update report will be submitted when results become available.

The cracked safe-end was manufac~ured from SA-182 F316 stainless steel and was unclad. The safe-end had been furnace-sensitized during manufacture. The replacement safe-end will be either SA-182 F316L stain-less steel or SA-105 carbon steel.