ML14121A116

Updated Dam Screening Analysis in Support of Energy Northwest'S Request for the Us Army Corps of Engineers (Usace) Dam Failure Analysis Support

ML14121A116
Person / Time
Site:	Columbia
Issue date:	04/14/2014
From:	Swank D A Energy Northwest
To:	Document Control Desk, Office of Nuclear Reactor Regulation
Shared Package
ML14176B181	List: GO2-14-055, Updated Dam Screening Analysis in Support of Energy Northwest'S Request for the Us Army Corps of Engineers (Usace) Dam Failure Analysis Support
References
GO2-14-055
Download: ML14121A116 (2)

Text

ENERGYNORTHWEST David A. SwankColumbia Generating StationP.O. Box 968, PE04Richland, WA 99352-0968 Ph. 509-377-2309 I F. 509-377-2354 daswank @ energy-northwest.com April 14, 2014G02-14-055 10 CFR 50.54(f)U.S. Nuclear Regulatory Commission ATTN: Document Control DeskWashington, DC 20555-0001

Subject:

COLUMBIA GENERATING

STATION, DOCKET NO. 50-397UPDATED DAM SCREENING ANALYSIS IN SUPPORT OF ENERGYNORTHWEST'S REQUEST FOR THE US ARMY CORPS OFENGINEERS (USACE) DAM FAILURE ANALYSIS SUPPORT

References:

1.Letter dated March 12, 2012, from E. J. Leeds (NRC) to All PowerReactor Licensees and Holders of Construction Permits in Active orDeferred Status, "Request for Information Pursuant to Title 10 of theCode 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 theFukushima Dai-ichi Accident"

2. NRC Interim Staff Guidance JDL-ISG-2013-01, "Guidance forAssessment of Flooding Hazards Due to Dam Failure,"

Revision 0, July29, 20133. Letter G02-13-141, dated October 4, 2013, from D. A. Swank (EnergyNorthwest) to NRC, "Energy Northwest's Request for NRC Assistance to Obtain Information from the US Army Corps of Engineers (USACE)Related to Dam Failure Analysis"

4. E-mail dated November 22, 2013, from J. R. Waters, (EnergyNorthwest) to F. Lyon (NRC), "Preliminary Results of Dam FailureScreenings

-Columbia Generating Station"

Dear Sir or Madam,

In Reference 1, the Nuclear Regulatory Commission (NRC) issued the request forinformation associated with Near-Term Task Force (NTTF) Recommendation 2.1 forFlooding.

In Reference 2, the NRC staff issued guidance for assessing floodinghazards due to dam failure.

In Reference 3, Energy Northwest requested that the NRCinterface with the U. S. Army Corps of Engineers (USACE),

such that the USACE wouldperform a dam failure analysis for the Columbia River watershed.

UPDATED DAM SCREENING ANALYSIS IN SUPPORT OF ENERGYNORTHWEST'S REQUEST FOR THE US ARMY CORPS OF ENGINEERS (USACE)DAM FAILURE ANALYSIS SUPPORTPage 2 of 2In a telephone call on Wednesday, November 13, 2013, Energy Northwest stated that itwould identify, no later than Friday, November 15, 2013, the specific dams for which itwas requesting the USACE to perform dam failure analyses.

In a November 15, 2013,email, Energy Northwest stated that it was performing screening level analyses, inaccordance with JLD-ISG-2013-01 (Reference 2), for the upstream dams addressed inColumbia's Final Safety Analysis Report (FSAR) Table 2.4-1, Major Columbia RiverBasin Dams, and certain upstream dams which are not addressed in the FSAR table.Energy Northwest also stated that it would report preliminary results of those screenings no later than November 22, 2013. The preliminary results of the upstream dams wereprovided in Reference 4 which also stated that the downstream dam assessment wouldbe provided upon completion of the assessment.

The attachment to this letter providesEnergy Northwest's updated analysis results in support of the request made inReference 3.There are no new or revised regulatory commitments contained in this letter. If youhave any questions or require additional information, please contact Ms. L. L. Williams at(509) 377-8148.

Executed on 11Pei / a?,,v9'Respectfully, D.A. SwankAssistant Vice President, Engineering

Attachment:

List of Potentially Critical Dams Based on JLD-ISG-2013-01, RO,Screening Methodscc: NRC Region IV Administrator NRC NRR Project ManagerNRC Senior Resident Inspector/988C MA Jones -BPA/1 399 (E-mail)