ML13254A151

Supplement to Flood Hazard Reevaluation Report Regulatory Commitments

ML13254A151
Person / Time
Site:	Calvert Cliffs, Nine Mile Point
Issue date:	09/06/2013
From:	Korsnick M Calvert Cliffs, Constellation Energy Nuclear Group, EDF Group
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML13254A151 (4)

Text

Mary G. Korsnick Office 410-470-5133 Acting CEO and Chief Nuclear Officer Fax 443-213-6739 E-mail: Maria. Korsnick@cengllc.com CENG.

a joint venture of 0 Coteai .

Ewagy, e~f September 6, 2013 U.S. Nuclear Regulatory Commission 11555 Rockville Pike Rockville, MD 20852 ATTENTION: Document Control Desk

SUBJECT:

Calvert Cliffs Nuclear Power Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-53 and DPR-69 Docket Nos. 50-317 and 50-318 Nine Mile Point Nuclear Station, Units 1 and 2 Renewed Facility Operating License Nos. DPR-63 and NPF-69 Docket Nos. 50-220 and 50-410 Supplement to Flood Hazard Reevaluation Report Regulatory Commitments

REFERENCES:

(a) Letter from J. A. Spina (CENG) to Document Control Desk (NRC), dated March 12, 2013, Flood Hazard Reevaluation Report (b) Letter from J. A. Spina (CENG) to Document Control Desk (NRC), dated March 12, 2013, Flood Hazard Reevaluation Report (c) Letter from C. R. Costanzo (NMPNS) to Document Control Desk (NRC),

dated August 1, 2013 The purpose of this letter is to provide additional information on the interim action regulatory commitments described in References (a) and (c) for Calvert Cliffs Nuclear Power Plant (CCNPP) and Nine Mile Point Nuclear Station (NMPNS), respectively. Reference (c) revised the regulatory commitments provided in Reference (b).

Two reevaluated flood mechanisms, local Probable Maximum Precipitation (PMP) and Probable Maximum Storm Surge (PMSS) exceeded the current design basis flood for Calvert Cliffs Units I and 2.

One reevaluated flood mechanism, local PMP, exceeded the current design basis flood for both NMP1 and NMP2.

The following tables provide a list of the interim actions taken and one action to be taken in the future, with additional supporting details. Neither NMPNS nor CCNPP will modify any of these interim actions without notifying the Nuclear Regulatory Commission in advance.

Constellation Energy Nuclear Group, LLC 100 Constellation Way, Suite 200C, Baltimore, MD 21202

Document Control Desk September 6, 2013 Page 2 Calvert Cliffs Nuclear Power Plant Item Interim Actions Taken as Report Implementation Number Included in the Reevaluation Reference Additional Actions Taken Date Report For a local PMP event, a Reference (a) The design of the FloodStop Completed FloodStop barrier will be cover letter, barriers has been verified to deployed at the Auxiliary Page 2 withstand the environmental Building access/entrance conditions that might points, accompany the reevaluated PMP event.

Installation of the FloodStop barriers has been verified to ensure that they can be properly installed within the required timeframes.

2 For a local PMP event, a Reference (a) Training on the use and Completed procedure to install the cover letter, installation of the FloodStop FloodStop barriers has been Page 2 barrier has been conducted implemented. for all necessary personnel.

3 For the PMSS event, to Reference (a) The design of the panel Completed mitigate the reevaluated cover letter, covers has been verified to storm surge elevation and Page 2 withstand the environmental minimize the water ingress conditions that might into the intake structure, accompany the reevaluated Calvert Cliffs has provided PMSS event.

waterproof panel covers, which will be placed over Installation of the panel the ventilation louvers above covers has been verified to the Circulating Water Pump ensure that they can be and Saltwater Pump motors properly installed within the to prevent water from required timeframes.

flooding the Intake Structure.

4 For the PMSS event, a Reference (a) Training on the use and Completed procedure to install the panel cover letter, installation of the panel covers has been Page 2 covers has been conducted implemented. I for all necessary personnel.

Document Control Desk September 6, 2013 Page 3 Nine Mile Point Nuclear Station Item Interim Actions Taken as Report Implementation Number Included in the Reevaluation Reference Additional Actions Taken Date Report I For a local PMP event, a Reference (c) The design of the FloodStop Completed FloodStop barrier will be barriers has been verified to deployed at the doors withstand the environmental detailed in Reference (c). conditions that might accompany the reevaluated PMP event.

Installation of the FloodStop barriers has been verified to ensure that they can be properly installed within the required timeframes.

2 For a local PMP event, a Reference (c) The procedure was revised Completed procedure to install the and demonstrated through FloodStop barriers has been simulations on the use and implemented. installation of the FloodStop barriers.

Item Interim Action to be Taken Report Additional Actions to be Implementation Number as Included in the Reference Taken Date Reevaluation Report An interim evaluation will be performed to identify actions to reduce the flood elevation for NMPI and reduce the flood duration for Reference 1 both NMP1 and NMP2. (b) Page 2 None August 1, 2014 The evaluation will consist of modeling potential modifications to site drainage systems and flood mitigation features.

This letter does not contain any new regulatory commitments.

Document Control Desk September 6, 2013 Page 4 If there are any questions regarding this submittal, please contact Everett (Chip) Perkins at 410-470-3928.

I declare under penalty of perjury that the foregoing is true and correct. Executed on September 6, 2013.

Sincerely, tary . Korsnick MGK/EMT cc: Project Manager, Calvert Cliffs, NRC Resident Inspector, Calvert Cliffs Project Manager, Nine Mile Point, NRC Resident Inspector, Nine Mile Point Project Manager, R.E. Ginna, NRC S. Gray, MD-DNR NRC Regional Administrator, Region I