ML13345B348

Closeout of Generic Letter, 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors (TAC Nos. MC4674 and MC4675)

ML13345B348
Person / Time
Site:	Catawba
Issue date:	12/31/2013
From:	Jason Paige Plant Licensing Branch II
To:	Henderson K Duke Energy Carolinas
Paige J, NRR/DORL 415-5888
References
TAC MC4674, TAC MC4675
Download: ML13345B348 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 December 31, 2013 Mr. K. Henderson Site Vice President Catawba Nuclear Station Duke Energy Carolinas, LLC 4800 Concord Road York, SC 29745

SUBJECT:

CATAWBA 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. MC4674 AND MC4675)

Dear Mr. Henderson:

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 Pressurized Water 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 (10 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) , September 1, 2005 (ADAMS Accession No. ML052500399) and June 28, 2006 (ADAMS Accession No. ML061870061), Duke Energy Carolinas, LLC (the licensee) provided responses to GL-2004-02 for the Catawba 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. ML060370347) the NRC issued a request for additional information (RAI).

By letters dated February 29, 2008 (ADAMS Accession No. ML080650559) and April 30, 2008, (ADAMS Accession No. ML081270091) the licensee provided responses to the RAls. The NRC staff reviewed the responses and concluded that additional information was still required. By letter dated November 21,2008 (ADAMS Accession No. ML083080373) the NRC issued a second set of RAls.

K. Henderson ~ 2 By letters dated September 30,2010 (ADAMS Accession No. ML102870100), August 13, 2012 (ADAMS Accession No. ML12229A512), and July 31, 2013 (ADAMS Accession No. ML13213A284), the licensee provided responses to the second set of RAls.

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. ML13331A673). 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 Catawba 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 301-415-5888 .

.Sincer~~J

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/ /Jason C. Paige, Project Manager V Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-413 and 50-414 cc: Distribution via Listserv

ML102870100), August 13,2012 (ADAMS Accession No. ML12229A512), and July 31,2013 (ADAMS Accession No. ML13213A284), the licensee provided responses to the second set of RAls.

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. ML13331A673). 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 Catawba 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 301-415-5888.

Sincerely, IRA!

Jason C. Paige, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-413 and 50-414 cc: Distribution via Listserv DISTRIBUTION:

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