ML13126A177

Supplemental Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Seismic Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi..

ML13126A177
Person / Time
Site:	Dresden
Issue date:	04/30/2013
From:	Kaegi G T, Ali E H Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RS-13-067
Download: ML13126A177 (3)

Text

N ExeLon Generation 10 CFR 50.54(f)RS-13-067 April 30, 2013 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike Rockville, MD 20852 Dresden Nuclear Power Station, Unit 3 Renewed Facility Operating License No. DPR-25 NRC Docket No. 50-249

Subject:

Supplemental Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Seismic Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident

References:

1. Exelon Generation Company, LLC 180-day Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Seismic Aspects of Recommendation 2.3 of the Near-Term Task force Review of Insights from the Fukushima Dai-ichi Accident, dated November 27, 2012 (RS-12-167)

2. NRC Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012 In Reference 1, Exelon Generation Company, LLC (EGC) provided the NRC with the Dresden Nuclear Power Station (DNPS), Units 2 and 3 seismic walkdown reports in accordance with the NRC Request for Information (Reference 2). The DNPS Units 2 and 3 seismic walkdown reports document the plant walkdowns performed to identify and address plant-specific vulnerabilities and verify the adequacies of monitoring and maintenance procedures.

In Table E-1 of Enclosure 2 of Reference 1, EGC provided the list of the fifteen (15) DNPS Unit 3 items that were deferred due to inaccessibility.

EGC committed to complete the walkdown inspection of these fifteen (15) items during the D3R22 Refueling Outage (Fall 2012). In Table E-2 of Enclosure 2 of Reference 1, EGC provided the list of the thirty-three (33) DNPS Unit 3 electrical cabinets that required supplemental inspections for which six (6) were completed.

EGC committed to complete the remaining twenty-seven (27) supplemental inspections of these electrical cabinets by D3R27 Refueling Outage (Winter 2022).

U.S. Nuclear Regulatory Commission Supplemental Response to 50.54(f) Letter NTTF Recommendation 2.3: Seismic April 30, 2013 Page 2 This letter provides the results of the completed walkdown inspections performed for the fifteen (15) DNPS Unit 3 items identified in Table E-1 of Enclosure 2 of Reference

1. These inspections were completed during the D3R22 Refueling Outage (Fall 2012). Additionally, this letter provides the supplemental internal inspection updates on the twenty-seven (27) remaining DNPS Unit 3 electrical cabinets identified in Table E-2 of Enclosure 2 of Reference 1, with one (1) additional internal inspection completed and two (2) items removed from the list which are not electrical cabinets and that were included in error. As a result of this change, twenty-four (24) supplemental internal electrical cabinet inspections remain for DNPS Unit 3.No degraded, nonconforming, or unanalyzed conditions that required either immediate or follow up actions were identified.

Enclosure 1 to this letter provides the updated DNPS Unit 3 Seismic Walkdown Report incorporating the results of the completed walkdowns of the fifteen (15) DNPS Unit 3 items identified in Table E-1 of Enclosure 2 of Reference 1, and the results for one (1) completed supplemental internal electrical cabinet inspection.

Additionally, two (2) items identified in Table E-2 of Enclosure 2 of Reference 1 have been removed from the list since they are not electrical cabinets and were included in error. The remaining twenty-four (24) supplemental internal electrical cabinet inspections for DNPS Unit 3 are listed in Table AE-2 of Enclosure 1 of this letter and will be inspected as previously committed.

This letter contains no new regulatory commitments.

Should you have any questions concerning the content of this letter, please contact Ron Gaston at (630) 657-3359.I declare under penalty of perjury that the foregoing is true and correct. Executed on the 30th day of April 2013.Respectfully, Glen T. Kaegi Director -Licensing

& Regulatory Affairs Exelon Generation Company, LLC

Enclosures:

1. Seismic Walkdown Report In Response To The 50.54(f) Information Request Regarding Fukushima Near-Term Task Force Recommendation 2.3: Seismic, Updated Transmittal

1. 1 (Annex A) for the Dresden Generating Station, Unit 3, Report No. RS-13-067 U.S. Nuclear Regulatory Commission Supplemental Response to 50.54(f) Letter NTTF Recommendation 2.3: Seismic April 30, 2013 Page 3 cc: Director, Office of Nuclear Reactor Regulation (with Enclosure 1 via CD)Regional Administrator

-NRC Region III (with Enclosure 1 via CD)NRC Senior Resident Inspector

-Dresden Nuclear Power Station (with Enclosure 1 via CD)NRC Project Manager, NRR -Dresden Nuclear Power Station (with Enclosure 1 via CD)Illinois Emergency Management Agency -Division of Nuclear Safety (with Enclosure 1 via CD)