ML13277A357
| ML13277A357 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 09/30/2013 |
| From: | Clark J Entergy Operations |
| To: | Geoffrey Miller Containment and Balance of Plant Branch |
| References | |
| Download: ML13277A357 (5) | |
Text
Entergy Operations, Inc.
River Bend Station Enteigy0 5485 U.S. Highway 61N St. Francisville, LA 70775 Tel 225-381-4177 Joseph A. Clark Manager-Licensing September 30, 2013 Mr. G. Edward Miller, Project Manager Projects Management Branch Japan Lessons-Learned Project Directorate Office of Nuclear Reactor Regulation 11555 Rockville Pike Rockville, MD 20852 RBG-47394
Subject:
Assistance in Obtaining Information on Dams River Bend Station - Unit 1 Docket No. 50-458 License No. NPF-47
REFERENCES:
- 1. NRC Letter to Entergy, Request for Information Pursuantto Title 10 of the Code of FederalRegulations 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 (RBC-51012) (ADAMS Accession No. ML12053A340)
- 2. NRC Interim Staff Guidance JLD-ISG-2013-01, Guidance for Assessment of Flooding Hazards Due to Dam Failure, Revision 0, July 29, 2013 (ML13151A153)
Dear Mr. Miller:
Entergy Operations, Inc. (Entergy) is re-evaluating flooding hazards at its nuclear power plant sites for the purpose of responding to the March 2012, request for information (RFI)
(Reference 1.). As part of this effort, Entergy has been gathering information from various government agencies and, in the case of dams, has recently contacted several districts of the United States (U.S.) Army Corps of Engineers (Corps). Based on the district telephone conversations, obtaining the information directly from the Corps is not possible due to its sensitive nature. As a result, Entergy requests the assistance of the NRC to obtain the information needed to complete the Probable Maximum Flood and Dam Failure Hazard Evaluations for the purpose of responding to the March 2012, RFI. In particular, Entergy requests that the NRC act as the interface between the Corps and Entergy and as outlined in Section 1.5.3 of Reference 2.
,Ac00
Assistance in Obtaining Information on Dams RBG-47394 Page 2 of 2 The information is needed to support the flooding re-evaluation at River Bend. The specific information needed is from one Corps district and is identified in the attachment to this letter.
The flooding re-evaluation for River Bend is due to the NRC by March 12, 2014. In order to complete the analyses required to meet this schedule, the information requested from the Corps is needed by October 25, 2013. To coordinate data transfer, please contact Mr.
George Mermigas at 225-381-4739.
This letter contains no new regulatory commitments. Should you have any questions regarding this submittal, please contact me.
JAC/wjf
Attachment:
U.S. Army Corps of Engineers Information Request cc: U.S. Nuclear Regulatory Commission Region IV 1600 E. Lamar Blvd.
Arlington, TX 76011-4511 U.S. Nuclear Regulatory Commission Attn: Document Control Desk 11555 Rockville Pike Rockville, MD 20852 NRC Resident Inspector PO Box 1050 St. Francisville, LA 70775 Central Records Clerk Public Utility Commission of Texas 1701 N. Congress Ave.
Austin, TX 78711-3326 Mr. Alan Wang, Project Manager U.S. Nuclear Regulatory Commission MS O-8B1 11555 Rockville Pike Rockville, MD 20852-2738 U. S. Nuclear Regulatory Commission Attn: Mr. Chris Cook Two White Flint North MS 7-F3 11555 Rockville Pike Rockville, MD 20852
Attachment to RBG-47394 U.S. Army Corps of Engineers Information Request
Attachment to RBG-47394 Page 1 of 2 U.S. Army Corps of Engineers Information Request The intent of this request is to support hydrologic and hydraulic analysis of the Mississippi River, including development of the probable maximum flood and evaluation of the effects of upstream dam failure. Each of the dams listed below has been identified as being either (a) likely to be "potentially critical" as defined in the NRC's 2013 document titled "Guidance for Assessment of Flooding Hazards Due to Dam Failure," JLD-ISG-2013-01, and/or (b) important to the hydrology of the study watershed as a result of reservoir flood control benefits. Entergy Operations Inc. (Entergy) is available to further discuss the objectives of the flooding hazard re-evaluation and the specifics of the data request with the United States (U.S.) Army Corps of Engineers. Entergy is also available to discuss data control requirements or confidentiality agreement requirements associated with receipt of the requested information and has the ability to withhold information from public disclosure pursuant to 10 CFR 2.390.
New Orleans District U.S. Army Corps of Engineers 7400 Leake Avenue New Orleans, LA 70118 A copy of the following documents or documents containing the following information:
Water control / operations manuals, dam failure analyses, plans and section drawings that include dam and outlet structure geometry as well as any hydraulic information (i.e., elevation-discharge-storage rating curves, spillway adequacy studies, design flood analysis, etc.) for the structures on the Mississippi River within the district, listed below:
" Old River Control Structure (Lock, Low Sill, Auxiliary, and Overbank)
- Sidney A. Murray Hydroelectric Dam (LA83001 and/or LA00598)
- Morganza Spillway
- Bonnet Carr6 Spillway GENERAL DISCUSSION It is understood that the information being requested is of a sensitive nature. In an effort to help facilitate a timely transfer of that information judged to be absolutely critical for the completion of the calculations necessary to respond to the 50.54(f) RFI, a list has been developed below which prioritizes requested data and describes its intended use:
- 1. Basic summary information about the configuration of the structures listed above including: key elevations (normal pool, spillway crest, top of dam, etc.); control gates, spillway, and lock configurations and geometries; spillway discharge curves; and general information. This information may be contained in summary documents.
This information will be used as part of the calculation of probable maximum flood (PMF) peak flow rate and peak flow rate with upstream dam failures in the Mississippi River adjacent to the RBS site. The information will also be used to develop the
Attachment to RBG-47394 Page 2 of 2 HEC-RAS (Hydrologic Engineering Center River Analysis System) hydraulic model for the purpose of calculating peak water surface elevations during the PMF and the dam failure flood mechanisms.
- 2. Release/discharge rules describing the operations of outlets, spillway gates, and locks during flood flows and/or graphs indicating stage/discharge curves during flood operations. This information is assumed to be included in Water Control / Regulation Manuals. Only those portions of the manuals describing release operations during floods are critical. Alternatively, a summary of the general operating procedures could be provided. This information will be used as part of the calculation of the PMF peak flow rate and peak flow rate with upstream dam failures in the Mississippi River adjacent to the RBS site. The information will also be incorporated into the HEC-RAS hydraulic model. This information is requested for the structures listed above.
Please note that existing inundation maps and failure analyses for these structures are NOT judged to be strictly necessary for the completion of the work required for the response to the 50.54(f) RFI.