BYRON 2005-0121, Steam Generator Tube Repairs Resulting from Byron Station, Unit-2, Cycle 12 Refueling Outage

Steam Generator Tube Repairs Resulting from Byron Station, Unit-2, Cycle 12 Refueling Outage

ML052920168
Person / Time
Site:	Byron
Issue date:	10/17/2005
From:	Kuczynski S Exelon Generation Co, Exelon Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
1.10.0101, BYRON 2005-0121
Download: ML052920168 (2)

Text

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Subject:

Steam Generator Tube Repairs Resulting from Byron Station, Unit-2, Cyclel2 Refueling Outage Pursuant to Item a of Technical Specification 5.6.9, Steam Generator (SG) Tube Inspection Reports, we are reporting the number of SG tubes plugged or repaired during Byron Station, Unit-2, Cycle 12 Refueling Outage.

A 100% full-length eddy current bobbin coil inspection was performed on all four Unit-2 steam generators. Additionally, a 20% plus-point inspection of tubes within the hot leg top of tubesheet region from +3 inches above to 17 inches below the top of the tubesheet was performed on all four Unit-2 steam generators. This sample included a 20% minimum sample of the total population of bulges >18 volts and over-expansions ~i.5 mils located within the hot leg tubesheet from top of the tubesheet to 17 inches below the top of the tubesheet.

A total of 17 tubes were plugged during the current Byron Station, Unit-2, Cycle 12 Refueling Outage.

Based upon the results of this inspection, SGs 2A and 2D steam generators were classified as inspection category C-i and SGs 2B and 2C were classified as inspection category C-2 in accordance with Technical Specification 5.5.9.c, Inspection Results Classification.

Byron Ltr: 2005-0121 October 17, 2005 Page 2 The plugging distribution between the SGs is summarized in the table below.

Steam Tubes Plugged Tubes Total Tubes Generator this Outage Plugged Plugged*

(B2R12) Previously 2A 0 144 144 2B 10 113 123 2C 4 53 57 2D 3 22 25 Total 17 332 349

• Each SG contains 4570 tubes If there are any questions regarding this information, please contact Mr. W. Grundmann, Regulatory Assurance Manager, at (815) 406-2800.

Respectfully, S~fI44~ £. ~

Stephen E. Kuczynski Site Vice President Byron Nuclear Generating Station SEK/JS/TLF/rah