RS-10-033, Supplemental Response to Generic Letter 2008-01

Supplemental Response to Generic Letter 2008-01

ML100480636
Person / Time
Site:	Dresden
Issue date:	02/17/2010
From:	Simpson P Exelon Corp, Exelon Generation Co, Exelon Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GL-08-001, RS-10-033
Download: ML100480636 (2)

Text

Exelon Nuclear 4300 Winfield Road Warrenville, lL 60555 February 17,2010 Nuclear 10 CFR 50.54(f) U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11 555 Rockville Pike Rockville, MD 20852 Dresden Nuclear Power Station, Unit 2 Renewed Facility Operating License No. DPR-19 NRC Docket No. 50-237

Subject:

Supplemental Response to Generic Letter 2008-01

References:

1. NRC Generic Letter 2008-01, "Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems," dated January 1 1,2008 2. Letter from K. R. Jury (Exelon Generation Company, LLCIAmerGen Energy Company, LLC) to U.S, NRC, "Three Month Response to Generic Letter 2008-01 ," dated April 1 1,2008 3. Letter from K. R. Jury (Exelon Generation Company, LLC/AmerGen Energy Company, LtC) to U.S. NRC, "Nine-Month Response to Generic Letter 2008- 01 ," dated October 14, 2008 The NRC issued Generic Letter (GL) 2008-01 (i.e., Reference

1) to request that each licensee evaluate the licensing basis, design, testing, and corrective action programs for the Emergency Core Cooling, Decay Heat Removal, and Containment Spray systems, to ensure that gas accumulation is maintained less than the amount that challenges operability of these systems, and that appropriate action is taken when conditions adverse to quality are identified.

References 2 and 3 provided the responses to NRC GL 2008-01 for Dresden Nuclear Power Station (DNPS). In Reference 2, an alternative course of action was described for DNPS Unit 2 since the GL 2008-01 requested evaluations would not be fully complete in accordance with the timeframe required by the GL. The remaining actions were to perform walkdowns of inaccessible piping sections and evaluations using results of the walkdowns.

February 17,201 0 U.S. Nuclear Regulatory Commission Page 2 As committed in Reference 2, this supplemental response is being submitted for DNPS Unit 2 to document completion of the walkdowns and any impact upon the GL 2008-01 nine-month response submitted in Reference 3, within 90 days following startup from the fall 2009 refueling outage. Walkdowns of inaccessible piping sections were completed during the fall 2009 refueling outage. Evaluation of the inaccessible walkdown results did not identify any unexpected vulnerabilities that impact the information in Reference 3, and no new corrective actions were deemed necessary.

In summary, based on reviews and changes discussed in Reference 3, the GL 2008-01 subject systems are in compliance with the current licensing and design bases and applicable regulatory requirements, and suitable design, operational, and testing control measures are in place for maintaining this compliance. There are no regulatory commitments contained in this letter. Should you have any questions concerning this letter, please contact Mr. Kenneth M. Nicely at (630) 657-2803.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 17th day of February 201 0. Manager - ~icensing U cc: NRC Regional Administrator - Region Ill Senior Resident Inspector - Dresden Nuclear Power Station

Text

Exelon Nuclear 4300 Winfield Road Warrenville, lL 60555 February 17,2010 Nuclear 10 CFR 50.54(f) U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11 555 Rockville Pike Rockville, MD 20852 Dresden Nuclear Power Station, Unit 2 Renewed Facility Operating License No. DPR-19 NRC Docket No. 50-237

Subject:

Supplemental Response to Generic Letter 2008-01

References:

1. NRC Generic Letter 2008-01, "Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems," dated January 1 1,2008 2. Letter from K. R. Jury (Exelon Generation Company, LLCIAmerGen Energy Company, LLC) to U.S, NRC, "Three Month Response to Generic Letter 2008-01 ," dated April 1 1,2008 3. Letter from K. R. Jury (Exelon Generation Company, LLC/AmerGen Energy Company, LtC) to U.S. NRC, "Nine-Month Response to Generic Letter 2008- 01 ," dated October 14, 2008 The NRC issued Generic Letter (GL) 2008-01 (i.e., Reference

1) to request that each licensee evaluate the licensing basis, design, testing, and corrective action programs for the Emergency Core Cooling, Decay Heat Removal, and Containment Spray systems, to ensure that gas accumulation is maintained less than the amount that challenges operability of these systems, and that appropriate action is taken when conditions adverse to quality are identified.

References 2 and 3 provided the responses to NRC GL 2008-01 for Dresden Nuclear Power Station (DNPS). In Reference 2, an alternative course of action was described for DNPS Unit 2 since the GL 2008-01 requested evaluations would not be fully complete in accordance with the timeframe required by the GL. The remaining actions were to perform walkdowns of inaccessible piping sections and evaluations using results of the walkdowns.

February 17,201 0 U.S. Nuclear Regulatory Commission Page 2 As committed in Reference 2, this supplemental response is being submitted for DNPS Unit 2 to document completion of the walkdowns and any impact upon the GL 2008-01 nine-month response submitted in Reference 3, within 90 days following startup from the fall 2009 refueling outage. Walkdowns of inaccessible piping sections were completed during the fall 2009 refueling outage. Evaluation of the inaccessible walkdown results did not identify any unexpected vulnerabilities that impact the information in Reference 3, and no new corrective actions were deemed necessary.

In summary, based on reviews and changes discussed in Reference 3, the GL 2008-01 subject systems are in compliance with the current licensing and design bases and applicable regulatory requirements, and suitable design, operational, and testing control measures are in place for maintaining this compliance. There are no regulatory commitments contained in this letter. Should you have any questions concerning this letter, please contact Mr. Kenneth M. Nicely at (630) 657-2803.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 17th day of February 201 0. Manager - ~icensing U cc: NRC Regional Administrator - Region Ill Senior Resident Inspector - Dresden Nuclear Power Station