ML14118A364

Response to Request for Additional Information Regarding Recommendation 2.1 Flood Hazard Reevaluation Extension Request

ML14118A364
Person / Time
Site:	Palo Verde
Issue date:	04/24/2014
From:	Mims D APS
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
102-06867-DCM/TNW/PJH
Download: ML14118A364 (6)

Text

10 CFR 50.54(f)

DWIGHT C. MIMS Senior Vice President, Nuclear Regulatory & Oversight Palo Verde j aps Nuclear Generating Station P.O. Box 52034 Phoenix, AZ 85072 Mail Station 7605 Tel 623 393 5403 102-06867-DCM/TNW/PJH April 24, 2014 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike Rockville, MD 20852

References:

1. NRC Letter, 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-ichiAccident, dated March 12, 2012

2. NRC Letter, Prioritizationof Response Due Dates for Request for Information Pursuantto Title 10 of the Code of FederalRegulations 50.54(f) Regarding Flooding Hazard Reevaluations for Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichiAccident, dated May 11, 2012

3. NRC Letter, Supplemental Information Related to Request for Information Pursuantto Title 10 of the Code of Federal Regulations 50.54(f) Regarding Flooding Hazard Reevaluations for Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichiAccident, dated March 1, 2013

4. APS Letter, 102-06850, APS Extension Request for Flooding Hazard Reevaluation Submittal, dated March 10, 2014

5. NRC Email, Request for Additional Information (RAI) Regarding Recommendation 2.1 Flood Hazard Reevaluation Extension Request, dated March 25, 2014

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3 Docket Nos. STN 50-528, 50-529, and 50-530 APS Response to Request for Additional Information Regarding Recommendation 2.1 Flood Hazard Reevaluation Extension Request On March 12, 2012, the U. S. Nuclear Regulatory Commission (NRC) issued Reference 1 to request information associated with Near-Term Task Force (NTTF)

Recommendation 2.1 for flooding, including a reevaluation of licensees' flooding A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway -Comanche Peak

• Diablo Canyon ° Palo Verde -Wolf Creek P ý:

102-06867-DCM/TNW/PJH ATTN: Document Control Desk U.S. Nuclear Regulatory Commission APS Response to Request for Additional Information Regarding Recommendation 2.1 Flood Hazard Reevaluation Extension Request Page 2 hazards. The NRC subsequently identified in Reference 2 the submittal date to report the results of the Flooding Hazard Reevaluation (FHR) for the Palo Verde Nuclear Generating Station (PVNGS), a Category 2 plant, as March 12, 2014. Reference 3 provides guidance regarding requests for extensions of the hazard reevaluation submittal dates. Reference 4 provided the APS justification for the extension of the scheduled submittal date for the flooding hazard reevaluation report to December 12, 2014. Reference 5 is the NRC Request for Additional Information (RAI) regarding the APS extension request.

Reason for the Delay The reasons for the delay are as follows:

• APS requires additional time to complete review and validation of the flooding hazard reevaluation calculation results involving watershed effects by independent consultants.

• APS requires additional time to perform new Local Intense Precipitation (LIP) analysis and evaluations for the areas in close proximity to PVNGS power block buildings.

• APS requires additional time to perform evaluations of safe shutdown equipment functionality verification and margin analysis, if needed, as a result of potential LIP water intrusion.

These reviews are necessary to provide the complete flooding hazard reevaluation report.

Proposed Schedule for the Submittal of a Complete Hazard Reevaluation Report The enclosed extension schedule provides a breakdown of the time required to complete the following additional activities:

• Complete calculation third party independent review

• Validation, verification and final selection of technical approach for LIP analysis

• Input validation and refinement for LIP / discussion with state and county agencies

• Perform new LIP analysis

• Safe shutdown equipment functionality verification and margin analysis, if needed

• Preparation of final submittal Basis for the Acceptability of the Revised Schedule This extension request was justified in Reference 4. The enclosure to this letter contains the revised schedule of analyses and activities remaining for submittal of the FHR for PVNGS.

102-06867-DCM/TNW/PJH AT-N: Document Control Desk U.S. Nuclear Regulatory Commission APS Response to Request for Additional Information Regarding Recommendation 2.1 Flood Hazard Reevaluation Extension Request Page 3 No commitments are being made to the NRC by this letter.

Should you have any questions concerning the content of this letter, please contact Mark McGhee, Department Leader, Regulatory Affairs, at (623) 393-4972.

I declare under penalty of perjury that the foregoing is true and correct.

Executed on (Date)

Sincerely, .,

DCM/TNW/PJH

Enclosure:

RAI for Flood Hazard Reevaluation Extension Request Schedule cc: E. J. Leeds NRC Director, Office of Nuclear Reactor Regulation M. L. Dapas NRC Region IV Regional Administrator J. K. Rankin NRC NRR Project Manager A. E. George NRC NRR Project Manager M. A. Brown NRC Senior Resident Inspector for PVNGS R. Kuntz NRC NRR/JLD Project Manager

ENCLOSURE RAI for Flood Hazard Reevaluation Extension Request Schedule

Apr-i 7-2014 Q aps RAI for Flood Hazard Reevaluation Extension Request Schedule M1: 2014 Apil 2014 2014 -,,204 1 141 S 22014 4 2014 1 Au-y 201 03 10 1 17 1 24 31 1 07 1 14 1 21 28 0 1 12 19 21 02 0 16 23 30 07 14 21 21 04 11 I8 25 01 04 16 2 0 20 04 13 20 7 03 10 17 24 01 as 15 22 129 105 RAI for Flood Hazard Reevaluation Extension Request Schedule RAI for Flood Hazard Reevaluation Exdension Request Schedule - Start Milestone Validation, Verification and Final Selection Technical Approach for LIP Analysis Complete Calculation 3rd Party Independent Review Input Validation ard Retirement for LIP I Discussion with State and CountyAgencies LIP Analysis Safe Shut Down Equipment Functionality Veification and Margin Analysis Preparation for Final Submittal

• Dec-12-2014" APS Commitment Date Remaining Level ofEffort RemarrnigWork Actual Level of Effort Actual Work Requastor Hamid Mortazavi Mi Misione Critical Remairrig Work Page 1 of 1 Project Scheduler. Ted Lykins