NLS2013094, Clarification to the Cooper Nuclear Station Flooding Walkdown Report
| ML13330B276 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 11/21/2013 |
| From: | Limpias O Nebraska Public Power District (NPPD) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NLS2013094 | |
| Download: ML13330B276 (6) | |
Text
H Nebraska Public Power District Always there when you need us NLS2013094 November 21, 2013 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike Rockville, MD 20852
Subject:
Clarification to the Cooper Nuclear Station Flooding Walkdown Report Cooper Nuclear Station, Docket No. 50-298, DPR-46
References:
1.
Nebraska Public Power District Letter to Nuclear Regulatory Commission, Flooding Walkdown Report - Nebraska Public Power District's Response to Nuclear Regulatory Commission Request for Information Pursuant to 10 CFR 50.54(l) 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 (NLS2012124)
- 2.
Nuclear Regulatory Commission Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(1)9 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
Dear Sir or Madam:
In Reference 1, Nebraska Public Power District (NPPD) provided the results of external flooding walkdowns performed at Cooper Nuclear Station (CNS). These results were provided to the Nuclear Regulatory Commission as a result of information requested per Reference 2. During subsequent reviews of the flooding walkdown report, NPPD identified one item in the report that requires clarification.
The Attachment provides a description of the clarification made to CNS' Flooding Walkdown Report. The Enclosure provides a replacement page with the change identified by a revision bar in the right hand margin.
There are no new commitments contained in this letter.
COOPER NUCLEAR STATION P.O. Box 98 / Brownville, NE 68321-0098 Telephone: (402) 825-3811 / Fax: (402) 825-5211 www.nppd.com
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Oct.,
NLS2013094 Page 2 of 2 Should you have any questions, please contact David Van Der Kamp, Licensing Manager, at (402) 825-2904.
I declare under penalty of perjury that the foregoing is true and correct.
Executed On 1
13,1 (Date)
Sincer y, A.ria~a Vice President - ýcerand Chief Nuclear Officer
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Attachment:
Description of Clarification Made to Cooper Nuclear Station's Flooding Walkdown Report
Enclosure:
Replacement Page for Cooper Nuclear Station's Flooding Walkdown Report cc:
Regional Administrator w/attachment and enclosure USNRC - Region IV Director w/attachment and enclosure USNRC - Office of Nuclear Reactor Regulation Cooper Project Manager w/attachment and enclosure USNRC - NRR Project Directorate IV-I Senior Resident Inspector w/attachment and enclosure USNRC - CNS NPG Distribution w/attachment and w/o enclosure CNS Records w/attachment and enclosure
NLS2013094 Attachment Page 1 of 2 NLS2013094 ATTACHMENT DESCRIPTION OF CLARIFICATION MADE TO COOPER NUCLEAR STATION'S FLOODING WALKDOWN REPORT
NLS2013094 Attachment Page 2 of 2 Description of Clarification Made to Cooper Nuclear Station's Flooding Walkdown Report 1.0
Background
On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued Reference 2 to all power reactor licensees and holders of construction permits in active or deferred status. In Enclosure 4 of Reference 2, the NRC requested licensees perform flooding walkdowns to verify that plant features credited in the current licensing basis for protection and mitigation from external flood events are available, functional, and properly maintained. Nebraska Public Power District (NPPD) provided Cooper Nuclear Station's flooding walkdown report on November 27, 2012 (Reference 1).
2.0 Description of Clarification During subsequent reviews of Reference 1, NPPD identified the following item requiring clarification on Page 2 of 36:
Description of Mean Sea Level (MSL) in List of Acronyms is modified to delete the reference to National Geodetic Vertical Datum of 1929 (NGVD29)
The List of Acronyms indicates that MSL is based on NGVD29. NGVD29 is a topographical surveying vertical control datum that would have been used at the time of the construction of the plant. Neither the Updated Safety Analysis Report (USAR), nor any other original plant construction documentation, identifies the datum to which the plant's benchmarks are set. When the plant was re-surveyed in 2012, the final results indicated that the plant is built 0.11 ft lower than NGVD29. The presence of this gap does not indicate any issues with the plant, its construction, or external flood protection. Required elevation values for flood protection and the elevations of the floors and levees that are given in the USAR have units of"ft MSL." This indicates that the same datum was consistently used to set the requirements and measure the elevations reported in the USAR.
This clarification does not impact the conclusions of Reference 1.
3.0 References
- 1.
Nebraska Public Power District Letter to Nuclear Regulatory Commission, Flooding Walkdown Report - Nebraska Public Power District's Response to Nuclear Regulatory Commission Request for Information Pursuant to 10 CFR 50.5409 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
- 2.
Nuclear Regulatory Commission Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54W9 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
NLS2013094 Enclosure Page 1 of 2 NLS2013094 ENCLOSURE REPLACEMENT PAGE FOR COOPER NUCLEAR STATION'S FLOODING WALKDOWN REPORT (Page 2)
CNS Flooding Walkdown Submittal Report LIST OF ACROMYMS Abbreviation Description AEC Atomic Energy Commission APM Available Physical Margin B&R Bums and Roe CA Corrective Action CAP Corrective Action Program CED Change Evaluation Document CFR Code of Federal Regulation CLB Current Licensing Basis CNS Cooper Nuclear Station COE Corps of Engineers(USACE)
CR Condition Report DB Design Basis ECCS Emergency Core Cooling System EE Engineering Evaluation ERP Elevated Release Point FSAR Final Safety Analysis Report HPCI High Pressure Core Injection IPEEE Individual Plant Examination of External Events IER INPO Industry Event Report MPF Multi-Purpose Facility MSL Mean Sea Level NEI Nuclear Energy Institute NPPD Nebraska Public Power District NRC Nuclear Regulatory Commission OWC Optimum Water Chemistry PM Preventative Maintenance PMF Probable Maximum Flood PMP Probable Maximum Precipitation PRA Probabilistic Risk Assessment RCA Radiological Controlled Area RCIC Reactor Core Injection Cooling RHR Residual Heat Removal RPS Reactor Protection System SER Safety Evaluation Report TRM Technical Requirements Manual TLCO Technical Requirements Manual Limiting Conditions of Operation URT Unit Reliability Team USACE United States Army Corps of Engineers USAR Updated Safety Analysis Report USNRC United States Nuclear Regulatory Commission Page 2 of 36