ML13351A426

Fort Calhoun, OPPD Information Concerning Available Physical Margin Regarding the Flooding Aspects of Recommendations 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident

ML13351A426
Person / Time
Site:	Fort Calhoun
Issue date:	12/13/2013
From:	Cortopassi L P Omaha Public Power District
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
LIC-13-0175
Download: ML13351A426 (2)

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Omaha Public Power District 444 South 1ftn Street Mall Omaha, NE 68102-2247 December 13, 2013 LlC-13-0175 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555

References:

1. Docket No. 50-285 2. Letter from NEI (James H. Riley) to OPPD (Fukushima Points of Contact),

"Available Physical Margin Determination,"

dated October 31, 2013 3. Letter from OPPD (L. P. Cortopassi) to NRC (Document Control Desk), "OPPD 180-day Response to NRC Request for Information Pursuant to 10 CFR 50.54(f)

Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident,"

dated November 27,2012 (ML 12334A449)

(LlC-12-0170)

4. Letter from OPPD (L. P. Cortopassi) to NRC (Document Control Desk), "OPPD Supplemental Response to NRC Request for Information Pursuant to 1 0 CFR 50.54(f)

Regarding the Flooding Aspects of Recommendations 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident,"

dated August 15, 2013 (ML 13228A098)

(LlC-13-0102)

Subject:

OPPD Information Concerning Available Physical Margin Regarding the Flooding Aspects of Recommendations 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident Reference 2 requests that all sites that submitted the results of a flooding protection walkdown performed in accordance with Nuclear Energy Institute (NEI) 12-07, Guidelines for Performing Verification Walkdowns of Plant Flood Protection Features provide information concerning methods used to determine Available Physical Margin (APM). OPPD completed the flood protection walkdowns at Fort Calhoun Station (FCS) and submitted the results in References 3 and 4. The process used to determine APM for Fort Calhoun Station utilized information from the Updated Safety Analysis Report (USAR), specifically, Section 2.7 Site and Environs Hydrology

. USAR Section 2.7.1.2, River Stage and Flow states that flooding protection is provided by removable flood barriers which extend to 1,014 feet and also states: The Corps of Engineers estimate of the flood level that might result from the failure of Oahe or Fort Randall dams coincident with the probable maximum flood that produces the 1,009.3 foot flood is 1,014 feet. The APM was determined using the height of the flood barriers and the flood level. The APM process was always consistent with the guidance in FAQ-030 and NEI 12-07, and no changes to the process were required. Employment with Equal Opportunity U. S. Nuclear Regulatory Commission LlC-13-0175 Page 2 If you should you have questions, please contact Mr. Bill Hansher at (402) 533-6894.

No commitments to the NRC are contained in this letter. I declare under penalty of perjury that the foregoing is true and correct.

Executed on December 13, 2013. Sincerely, ouis P. Cortopassi Site Vice President and CNO LPC/JKG/mle c: E. J. Leeds, Director, Office of Nuclear Reactor Regulation M. L. Dapas, NRC Regional Administrator, Region IV J. M. Sebrosky, NRC Senior Project Manager L. E. Wilkins, NRC Project Manager J. C. Kirkland, NRC Senior Resident Inspector