ML17252A234

Transmittal of Reportable Occurrence Report No. 50-249/1976-10

ML17252A234
Person / Time
Site:	Dresden
Issue date:	07/15/1976
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS Ltr. #76-533 50-249/1976-10
Download: ML17252A234 (3)

Text

CommonweA Edison Dresden Nuclea~wer Station R.R. #1 Morris, lllinoi~ 6045~ .

Telephone 8'15/942-2920 BBS Ltr. #76-533 July 15, 1976 sEGf/V£D JUL2J1976 ~

U1'4 NUet.!A Mr. James G. Keppler, Regional Director COMM R REGULAroar lllall ISS ION Directorate of Regulatory Operations - Region III . Secuilii U. S. Nuclear Regulatory Commission ~

799 Roosevelt Road Glen Ellyn, r-llinois 60137 Enclosed please find Reportable Occurrence report number 50-249/1976-10.

This report is being submitted to your off ice in accordance with the Dresden Nuclear Power Station Technical Specifications, Section 6.6.B.

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• B. B. Stephenson Station Superintendent Dresden Nuclear Power Station BBS:jo Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC 7320

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. LICENSEE LICENSE -EVENT NAME LICENSE NUMBER TYPE TYPE

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AMOUNT OF ACTIVITY

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80 OFFSITE CONSEQUENCES

. GE Nit 80 7 8 9 LOSS OR DAMAGE JO FACILITY TYPE DESCRIPTION

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EVENT DESCRIPTION (Continued)

The diaphragm acts as a seal inside the heat exchanger. Leakage was contained with-in a controlled area and was routinely processed by the radwaste system.

The cracks were ground out, and the affected area was rewelded and dye-penetrant tested. No discontinuities were noted, The heat exchanger was successfully leak-tested and was subsequently returned to service.

In ~ay, 1972, a crack was discovered and repaired at a different location in the sam~ circumferential diaphragm-to-tube sheet weld. No other failures of this nature/have occurred on the cleanup non-regenerative heat exchangers on Units 2 and 3. (50-249/1976-10)