Mark T. Finley 750 East Pratt Street, Suite 1400Senior Vice President, Regulatory Affairs & Engineering Baltimore, Maryland 21202

UniStarNUCLEAR ENERGY

January 30, 2013

UN#13-006

ATTN: Document Control DeskU.S. Nuclear Regulatory CommissionWashington, DC 20555-0001

Subject: UniStar Nuclear Energy, NRC Docket No. 52-016Calvert Cliffs Nuclear Power Plant, Unit 3Updated RAI Closure Plan

References: 1) UniStar Nuclear Energy Letter UN#12-017, from Mark Finley to DocumentControl Desk, U.S. NRC, Updated RAI Closure Plan, dated February 21, 2012

2) UniStar Nuclear Energy Letter UN#12-044, from Mark Finley to DocumentControl Desk, U.S. NRC, UHS RAI 325 et al., Schedule Revision, dated May18, 2012

3) Emergency Preparedness Enhancements Interim Staff Guidance,NSIR/DPR-ISG-01, November 23, 2011

On February 21, 2012, UniStar Nuclear Energy (UNE) submitted an Updated Request forAdditional Information (RAI) Closure Plan for the remaining RAI questions associated with theCalvert Cliffs Nuclear Power Plant Unit 3 (CCNPP3) Combined License Application (COLA)(Reference 1). Schedules for Ultimate Heat Sink (UHS) related RAls were subsequently revisedin Reference 2, May 18, 2012. The purpose of this letter is to provide a current Updated RAIClosure Plan including the UNE response schedule for all outstanding RAI questions.

This letter also provides a schedule for revising the CCNPP3 Emergency Plan (EP), COLAPart 5, to address the enhancements identified in the referenced Interim Staff Guidance(Reference 3). The CCNPP3 EP will be submitted by April 30, 2013. This submittal date hasbeen verbally discussed with the NRC staff at a previous UNE Design Center Working Groupmeeting. The submittal date supports the NRC request to review the CCNPP3 EP prior toNRC's receipt of the operating plants EP revisions in October 2013. UNE also plans to updatethe Security Plan, COLA Part 8, by April 30, 2013, including a revised Mitigative StrategiesReport incorporating all RAls received to date. Schedules for the revised EP and Security Planshad not been previously established. Submittal dates are also being established for updatedresponses to RAI 329 for Parts 30, 40 and 70, and RAI 281 for COLA Part 1 and Final SafetyAnalysis Report (FSAR) Chapter 1 review issues.

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The Enclosure includes revised dates for several UHS-related RAI responses. These reviseddates are due to incorporation of design changes to the UHS system in the design certificationand to modifications to the UHS Makeup system needed to support previous UHS related RAIs.The analyses to support these RAI responses could not be completed until details of the designchanges were established.

The majority of the remaining revised RAIs response dates in the Enclosure are required due tocomplexities that have arisen since the last schedules were established. UNE has undertaken asignificant increase in scope in the seismic analysis due to our commitment to use the SASSIdirect method. The resulting seismic models have a level of complexity such that significantportions cannot be analyzed on UNE or AREVA in-house computer systems. UNE and AREVAare employing multiple supercomputers owned by large universities and computer resourcecorporations to run the SASSI models. The seismic analyses for the EPR design certificationare being done with the same computer and human resources as the COLA analyses and mustbe performed prior to the site-specific analyses. These logistical complications combine tocause the need for additional time as compared to the previous UNE response schedule forseismic analysis related RAIs.

UNE recognizes the importance of providing complete and accurate responses in a timeframecorresponding to the availability of NRC staff resources. Therefore, in order to minimize thedelay, UNE will be providing the seismic RAI responses in conjunction with the designcertification advance RAI submittals. UNE recognizes the risk in providing these responsesbefore NRC review of the design certification responses is complete, however, this process isnecessary to maintain a review schedule that will support an acceptable COL issuance date.

This letter does not contain any sensitive or proprietary information.

If there are any questions regarding this transmittal, please contact me at (410) 369-1907, orMr. Wayne A. Massie at (410) 369-1910.

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

ExecuteA on Janu 3,1

Mrk T. Finley

Enclosure: Updated Calvert Cliffs Unit 3 RAI Response Schedule

cc: Surinder Arora, NRC Project Manager, U.S. EPR Projects BranchLaura Quinn-Willingham, NRC Environmental Project Manager, U.S. EPR COL ApplicationAmy Snyder, NRC Project Manager, U.S. EPR DC Application,Patricia Holahan, Acting Deputy Regional Administrator, NRC Region II,Silas Kennedy, U.S. NRC Resident Inspector, CCNPP, Units 1 and 2,David Lew, Deputy Regional Administrator, NRC Region I

UN#13-006

Enclosure

Updated Calvert Cliffs Unit 3 RAI Response Schedule

UN#13-006EnclosurePage 2 of 3

Updated Calvert Cliffs Unit 3 RAI Response SchedulePrevious Updated

RAI Section Question Subject Response ResponseDate Date

177 9B 9.05.01-14 Fire Protection Drawings 9B-1 thru 4/15/2013 4/15/20139B-9

281 Part 1 COLA Part 1 and FSAR Chapter 1 NA 11/30/2013review issues

287 9.2.5 9.02.05-19 Ultimate Heat Sink 4/30/2013 4/30/2013301 3.8.4 3.08.04-21 Seismic Design 4/12/2013 4/12/2013308 3.8.5 3.08.05-9 ESWB Settlement 2/26/2013 7/31/2013

314 3.7.1 3.07.01-16 Seismic Design Parameters (NI, 6/5/2013 7/31/2013NAB, AB, ESWB, EPGB)

315 3.7.2 3.07.02-64 (1 of 3) Seismic Analysis (CBIS) 2/6/2013 4/30/2013

315 3.7.2 3.07.02-63 Seismic Analysis (TB/SWGB) 6/5/2013 6/29/2013

315 3.7.2 3.07.02-64 (2 of 3) Seismic Analysis (NI, NAB, AB, 6/5/2013 7/31/2013ESWB) Q64

315 3.7.2 3.07.02-62 Seismic Analysis - Stability (NAB, 7/10/2013 7/31/20133.07.02-64 (3 of 3) EPGB)3.07.02-653.07.02-66

329 Part 1 01-14 Part 30 and Part 40 Table of NA 3/01/2013Changes

329 Part 1 01-14 Clarify Part 70 Response NA 3/15/2013331 9.2.5 9.02.05-21 UHS Tower Interference 4/30/2013 4/30/2013333 3.8.4 3.08.04-32 Other Category I Structures 4/30/2013 4/30/2013335 MSR 18 questions Mitigative Strategies Report - LOLA 4/30/2013 4/30/2013339 3.8.4 03.08.04-33 MWIS Seismic Analysis 4/30/2013 4/30/2013

03.08.04-34343 3.7.2 03.07.02-71 Seismic System Analysis - SASSI 1/31/2013 4/30/2013

03.07.02-7203.07.02-7303.07.02-74

346 13.3 13.03-51 Fukushima NTTF 9.3 NA 2/28/2013353 19.1 19.01-1 Technical Adequacy of Probabilistic 7/31/2013 7/31/2013

Risk Assessment354 12.3 12.03-12.04-10 Radiation Protection Design NA 3/15/2013

Features - revised dose calculationfor construction workers

355 3.9.5 03.09.05-1 Reactor Pressure Vessel Internals 4/15/2013 4/15/2013356 3.4.1 03.04.01-1 Internal Flood Protection for Onsite 4/15/2013 4/15/2013

Equipment Failures362 3.9.3 03.09.03-2 ASME Class 1, 2 and 3 4/15/2013 4/15/2013

Components P1363 3.9.3 03.09.03-3 ASME Class 1, 2 and 3 4/15/2013 4/15/2013

Components P2

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Updated Calvert Cliffs Unit 3 RAI Response SchedulePrevious Updated

RAI Section Question Subject Response ResponseDate Date

364 3.9.3 03.09.03-4 ASME Class 1, 2 and 3 4/15/2013 4/15/2013Components P3

365 9.2.5 09.02.05-30 Ultimate Heat Sink 4/30/2013 4/30/2013368 3.8.5 03.08.05-10 Foundations (RAI 308 Q8) 3/21/2013 3/21/2013369 3.8.5 03.08.05-11 Foundations (RAI 308 Q9) 3/21/2013 3/21/2013

372 13.3 13.03-52 Site Impediments NA 2/28/201313.03-54 Emergency Action Levels13.03-55 Alert Notification System13.03-57 Dose Assessment

372 13.3 13.03-53 Shift Staffing NA 4/30/2013376 3.5.1 03.05.01.03-23 Turbine Missiles - ITAAC 1/31/2013 1/31/2013

03.05.01.03-24

378 3.7.2 03.07.02-75 Seismic System Analysis (Fire 3/29/2013 3/29/2013Protection, followup to RAI 253Q45

379 19.0 19-27 PRA Severe Accident Evaluation 2/26/2013 2/26/2013380 8.2 08.02-11 Offsite Power System 2/26/2013 6/28/2013

382 9.4.4 09.04.04-4 Turbine Area Ventilation System 2/8/2013 2/8/2013(Switchgear Building)

383 Cyber 13.06.06-5 Cyber Security Plan Footnotes 2/21/2013 2/21/2013Security 13.06.06-6

NA 13.3 NA Ownership Change Impact NA 7/31/2013NA Part 5 NA Emergency Plan NA 4/30/2013NA Part 8 NA Security Plan NA 4/30/2013

Note: Dates in underlined red text have been revised.