UNITED STATES 

NUCLEAR REGULATORY COMMISSION 

WASHINGTON, D.C. 20555-0001 

Mr. Steven D. Capps 

Vice President 

McGuire Nuclear Station 

Duke Energy Carolinas, LLC 

12700 Hagers Ferry Road 

Huntersville, NC 28078-8985 

April 24, 2014 

SUBJECT: MCGUIRE NUCLEAR STATION, UNITS 1 AND 2, CLOSEOUT OF GENERIC 

LETTER, 2004-02, "POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON 

EMERGENCY RECIRCULATION DURING DESIGN BASIS ACCIDENTS AT 

PRESSURIZED-WATER REACTORS" (TAC NOS. MC4692 AND MC4693) 

Dear Mr. Capps: 

The U.S. Nuclear Regulatory (NRC) issued Generic Letter (GL) 2004-02, "Potential Impact of 

Debris Blockage on Emergency Recirculation During Design Basis Accidents at PressurizedWater Reactors" (Agencywide Documents Access and Management System (ADAMS) 

Accession No. ML042360586) dated September 13, 2004, requesting that licensees address 

the issues raised by Generic Safety Issue (GSI) - 191, "Assessment of Debris Accumulation on 

Pressurized Water Reactor Sump Performance." 

The stated purpose of GL 2004-02 was focused on demonstrating compliance with Title 10 of 

the Code of Federal Regulations (1 0 CFR) Part 50 Section 50.46, "Acceptance Criteria For 

Emergency Core Cooling Systems For Light Water Reactors." Specifically the GL requested 

addressees to perform an evaluation of the emergency core cooling system (ECCS) and 

containment spray system (CSS) recirculation and, if necessary take additional action to ensure 

system function, in light of the potential susceptibility of pressurized-water reactor (PWR) sump 

screens to blockage during a design basis accident requiring recirculation operation of the 

ECCS or CSS, and on the potential for additional adverse effects due to debris blockage of 

flowpaths necessary for ECCS and CSS recirculation and containment drainage. 

By letters dated March 1, 2005 (ADAMS Accession No. ML050670465), and September 1, 2005 

(ADAMS Accession No. ML052500399), Duke Energy Carolinas, LLC (the licensee) provided 

responses to GL-2004-02 for the McGuire Nuclear Station, Units 1 and 2. In order for the NRC 

staff to complete its review, by letter dated February 9, 2006 (ADAMS Accession No. 

ML060370427) the NRC issued a request for additional information (RAI). 

By letters dated February 28, 2008 (ADAMS Accession No. ML080730131) and April 30, 2008, 

(ADAMS Accession No. ML081280488) the licensee provided responses to the RAis. The NRC 

staff reviewed the responses and concluded that additional information was still required. By 

letter dated November 18, 2008 (ADAMS Accession No. ML083080350) the NRC issued a 

second set of RAis. 

By letters dated September 30, 2010 (ADAMS Accession No. ML 102870100), July 2, 2012 

(ADAMS Accession No. ML 12200A021), and July 31, 2013 (ADAMS Accession No. 

ML 13231A113), the licensee provided responses to the second set of RAis. 
S. Capps - 2-

The NRC staff performed a thorough review of all Duke Energy Carolinas, LLC responses and 

RAI supplements to GL 2004-02. The NRC staff conclusions have been documented (ADAMS 

Accession No. ML 14085A065). Based on the NRC staff conclusions, the NRC staff finds that 

Duke Energy Carolinas, LLC has provided adequate information as requested by GL 2004-02. 

The NRC staff finds the information provided demonstrates that debris will not inhibit the ECCS 

or CSS performance of its intended function in accordance with 10 CFR 50.46 to assure 

adequate long term core cooling following a design basis accident. Therefore, the NRC staff 

finds the licensee's responses to GL-2004-04 are adequate and considers GL-2004-02 closed 

for the McGuire Nuclear Station, Units 1 and 2. No further information or action is requested of 

the licensee. 

If you have any questions, please call me at 301-415-2481. 

Docket Nos. 50-369 and 50-370 

cc: Distribution via Listserv 

Si(J;Jtf., \ 

G. Edward Miller, Project Manager 

Plant Licensing Branch 11-1 

Division of Operating Reactor Licensing 

Office of Nuclear Reactor Regulation 
OFFICE 

NAME 

DATE 

S. Capps - 2-

The NRC staff performed a thorough review of all Duke Energy Carolinas, LLC responses and 

RAI supplements to GL 2004-02. The NRC staff conclusions have been documented (ADAMS 

Accession No. ML 14085A065). Based on the NRC staff conclusions, the NRC staff finds that 

Duke Energy Carolinas, LLC has provided adequate information as requested by GL 2004-02. 

The NRC staff finds the information provided demonstrates that debris will not inhibit the ECCS 

or CSS performance of its intended function in accordance with 10 CFR 50.46 to assure 

adequate long term core cooling following a design basis accident. Therefore, the NRC staff 

finds the licensee's responses to GL-2004-04 are adequate and considers GL-2004-02 closed 

for the McGuire Nuclear Station, Units 1 and 2. No further information or action is requested of 

the licensee. 

If you have any questions, please call me at 301-415-2481. 

Docket Nos. 50-369 and 50-370 

cc: Distribution via Listserv 

DISTRIBUTION: 

PUBLIC 

RidsAcrsAcnw _MaiiCTR Resource 

RidsNrrDorllpl2-1 Resource 

RidsNrrSsib 

RidsNrrPMMcGuire- Resource (hard copy) 

SSanders 

ADAMS Accession No.: ML 14090A444 

Sincerely, 

IRA/ 

G. Edward Miller, Project Manager 

Plant Licensing Branch 11-1 

Division of Operating Reactor Licensing 

Office of Nuclear Reactor Regulation 

LPL2-1 R/F 

RidsNrrDirsltsb Resource 

RidsNrrDoriDpr Resource 

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RidsRgn2MaiiCenter Resource 

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