BYRON 2004-0131, Notification of Deferral of a Generic Letter (GL) 89-13 Component Cooling Heat Exchanger Inspection

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Notification of Deferral of a Generic Letter (GL) 89-13 Component Cooling Heat Exchanger Inspection
ML043630420
Person / Time
Site: Byron  Constellation icon.png
Issue date: 12/17/2004
From: Kuczynski S
Exelon Generation Co, Exelon Nuclear
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
GL-89-013, LTR: BYRON 2004-0131
Download: ML043630420 (2)
v • d • e


Text

Exelkrns.

Exelon Generation Company LLC www.exeloncorp.com Nuclear Byron StationNula 4450 North German Church Road Byron, IL 61010-9794 December 17, 2004 LTR: BYRON 2004-0131 File: 2.01.0700 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 Byron Station, Unit 1 and Unit 2 Facility Operating License Nos. NPF-37 and NPF-66 NRC Docket Nos. STN 50-454 and STN 50-455

Subject:

Notification of Deferral of a Generic Letter (GL) 89-13 Component Cooling Heat Exchanger Inspection

References:

1) Generic Letter 89-13, "Service Water System Problems Affecting Safety Related Equipment,dated July 18, 1989"
2) Letter from M.H. Richter (Exelon) to NRC Document Control Desk, "Response to Generic Letter 89-13, dated January 29,1990"
3) Letter from S.E. Kuczynski (Exelon) to NRC Document Control Desk, "Regulatory Commitment Change Summary Report, dated April 1, 2004" Byron Station Unit 1 and 2 have a shared Component Cooling (CC) Water Heat Exchanger (i.e., OCC01A). Conducting a visual inspection of this heat exchanger on a frequency of once per 5 years is part of our commitment to GL 89-13. In Reference 3 we notified the NRC of a revision to this commitment to allow a 25% grace period to the 5-year frequency in order to facilitate scheduling.

OCCOlA was successfully inspected in the first four inspections since implementation of the GL 89-13 Program (i.e., June 1990, January 1992, July 1993, and June 1998.)

However, the fifth inspection scheduled for .Septmber2004 could not be accomplished due to the inability to obtain proper isolation of the heat exchanger due to degraded essential service water isolation valves. September 2004 was the end of the 5-year plus 25% interval.

An Engineering Evaluation concluded that it was acceptable to defer this inspection by 6 months until the Unit-1 refueling outage (i.e., B1 R1 3) scheduled for March 2005. This extension was based on historic inspection and Eddy Current Test results of OCC01A, comparison to the other CC heat exchangers and operational parameters of the OCCOlA during plant cooldowns for at least the last two refuel outages. During B1 R13 outage period, a preferred thermal performance test is planned for this heat exchanger versus a visual inspection. Subsequent to this performance test, a suitable periodic inspection of OCC01 A will be chosen but not to exceed a nominal 5-year frequency.

Should you have any questions concerning this letter, please contact William Grundmann, Regulatory Assurance Manager, at (815) 406-2800.

Respectfully, Stephen E. Kuczynski Site Vice President Byron Nuclear Generating Station cc: Regional Administrator - NRC Region III NRC Senior Resident Inspector - Byron Station NRC Project Manager - NRR - Byron Station Office of Nuclear Facility Safety - Illinois Department of Nuclear Safety

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Text

Exelkrns.

Exelon Generation Company LLC www.exeloncorp.com Nuclear Byron StationNula 4450 North German Church Road Byron, IL 61010-9794 December 17, 2004 LTR: BYRON 2004-0131 File: 2.01.0700 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 Byron Station, Unit 1 and Unit 2 Facility Operating License Nos. NPF-37 and NPF-66 NRC Docket Nos. STN 50-454 and STN 50-455

Subject:

Notification of Deferral of a Generic Letter (GL) 89-13 Component Cooling Heat Exchanger Inspection

References:

1) Generic Letter 89-13, "Service Water System Problems Affecting Safety Related Equipment,dated July 18, 1989"
2) Letter from M.H. Richter (Exelon) to NRC Document Control Desk, "Response to Generic Letter 89-13, dated January 29,1990"
3) Letter from S.E. Kuczynski (Exelon) to NRC Document Control Desk, "Regulatory Commitment Change Summary Report, dated April 1, 2004" Byron Station Unit 1 and 2 have a shared Component Cooling (CC) Water Heat Exchanger (i.e., OCC01A). Conducting a visual inspection of this heat exchanger on a frequency of once per 5 years is part of our commitment to GL 89-13. In Reference 3 we notified the NRC of a revision to this commitment to allow a 25% grace period to the 5-year frequency in order to facilitate scheduling.

OCCOlA was successfully inspected in the first four inspections since implementation of the GL 89-13 Program (i.e., June 1990, January 1992, July 1993, and June 1998.)

However, the fifth inspection scheduled for .Septmber2004 could not be accomplished due to the inability to obtain proper isolation of the heat exchanger due to degraded essential service water isolation valves. September 2004 was the end of the 5-year plus 25% interval.

An Engineering Evaluation concluded that it was acceptable to defer this inspection by 6 months until the Unit-1 refueling outage (i.e., B1 R1 3) scheduled for March 2005. This extension was based on historic inspection and Eddy Current Test results of OCC01A, comparison to the other CC heat exchangers and operational parameters of the OCCOlA during plant cooldowns for at least the last two refuel outages. During B1 R13 outage period, a preferred thermal performance test is planned for this heat exchanger versus a visual inspection. Subsequent to this performance test, a suitable periodic inspection of OCC01 A will be chosen but not to exceed a nominal 5-year frequency.

Should you have any questions concerning this letter, please contact William Grundmann, Regulatory Assurance Manager, at (815) 406-2800.

Respectfully, Stephen E. Kuczynski Site Vice President Byron Nuclear Generating Station cc: Regional Administrator - NRC Region III NRC Senior Resident Inspector - Byron Station NRC Project Manager - NRR - Byron Station Office of Nuclear Facility Safety - Illinois Department of Nuclear Safety

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