BYRON 2002-0102, Steam Generator Tube Repairs Resulting from Byron Station, Unit 2 Cycle 10 Refueling Outage

Steam Generator Tube Repairs Resulting from Byron Station, Unit 2 Cycle 10 Refueling Outage

ML022900008
Person / Time
Site:	Byron
Issue date:	10/08/2002
From:	Lopriore R Exelon Generation Co, Exelon Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
3.11.0530, LTR:BYRON 2002-0102
Download: ML022900008 (2)

Text

"Exelkn.

Exelon Generation Company, LLC www exeloncorp corn Nuclear Byron Station 4450 North German Church Road Byron, IL61010-9794 October 8, 2002 LTR: BYRON 2002-0102 File: 3.11.0530 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 Byron Station, Unit 2 Facility Operating License No. NPF-66 NRC Docket No. STN 50-455

Subject:

Steam Generator Tube Repairs Resulting from Byron Station, Unit 2, CyclelO 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 10 Refueling Outage (B2R1 0).

A 100% full-length eddy current bobbin coil inspection and 75% plus-point inspection of the hot leg top of tubesheet and low row U-bend regions were performed on all four steam generators. 75% of the total population of hot leg dents and dings that were greater than 5.0 volts were also inspected with the plus-point probe in all steam generators. In addition, a 25% plus-point inspection of the pre-heater baffle plate expansions was performed in the 2B, 2C, and 2D steam generators.

Based upon the results of this inspection, steam generators 2B, 2C, and 2D were classified as inspection category C-I in accordance with Technical Specification 5.5.9.c, "Inspection Results Classification." Steam generator 2A was classified as inspection category C-2. A total of 14 tubes were plugged during the current Byron Station, Unit 2, Cycle 10 Refueling Outage. The plugging distribution between the SGs is summarized in the table below.

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

(B2R10) Previously 2A 2 50 52 2B 0 113 113 2C 9 44 53 2D 3 19 22

-Total 14 226 240

• Each SG contains 4570 tubes C

/

Byron Ltr. 2002-0102 October 8, 2002 Page 2 If there are any question regarding this information, please contact Mr. W. Grundmann, Regulatory Assurance Manager, at (815) 406-2800.

Respectfully, Richdrd P. Lopriore /

Site Vice President Byron Nuclear Generating Station RPL/JS/DD/rah cc: Regional Administrator - NRC Region III NRC Senior Resident Inspector - Byron Station NRC Project Manager - NRR - Byron Station Office of Nuclear Facility Safety - IDNS