ML080770394

Supplemental Response to Nuclear Regulatory Commission Generic Letter 2004-02: Potential Impact of Debris Blockage on Emergency Recirculating During Design Basis Accidents at Pressurized Water Reactors

ML080770394
Person / Time
Site:	Cook
Issue date:	02/29/2008
From:	Peifer M American Electric Power Co, Indiana Michigan Power Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
AEP:NRC:8054-02, GL-04-002
Download: ML080770394 (3)

Text

11ý Indiana Michigan Power INDIANA Cook Nuclear Plant MICHIGAN One Cook Place P/IWER Bridgman, Ml 49106 AEPcom A unit of American Electric Power February 29, 2008 AEP:NRC:8054-02 10 CFR 50.54(f)

Docket Nos.: 50-315 50-316 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike Rockville, Maryland 20852 Donald C. Cook Nuclear Plant Units 1 and 2 SUPPLEMENTAL RESPONSE TO NUCLEAR REGULATORY COMMISSION GENERIC LETTER 2004-02:

POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY RECIRCULATION DURING DESIGN BASIS ACCIDENTS AT PRESSURIZED WATER REACTORS This letter provides I&M's supplemental response to GL 2004-02. The documents referenced in this letter and its attachments are identified in Attachment 1. The abbreviations, acronyms, and symbols are defined in Attachment 2.

By GL 2004-02 (Reference 1), the NRC identified concerns regarding the potential for post-accident debris to impede or prevent the recirculation functions of emergency core cooling and containment spray systems at PWRs. The NRC requested that PWR licensees mechanistically evaluate this potential for their plants and identify corrective measures that would be taken.

By Reference 2, I&M provided initial information regarding the methodology and containment walkdowns that would be used for the requested mechanistic evaluations at CNP, and the planned completion date for these activities. By Reference 3, I&M provided a comprehensive description of the in-progress and planned actions to address the concerns identified in GL 2004-02, including plant modifications, implementation schedule, mechanistic evaluation methodology, emergency core cooling system head margin, sump strainer areas, postulated head loss, potential flow path choke points, downstream effects, sump strainer structural considerations, licensing basis changes, and programmatic controls. By Reference 4, I&M provided revised commitments and updated a portion of the information previously provided by Reference 3.

By Reference 5, the NRC requested additional information regarding the responses provided in References 2, 3, and 4.

By Reference 6, the NRC authorized an alternative approach that permitted an extended due date for the requested additional information.

By Reference 7, I&M updated the information provided in References 2, 3, and 4, and provided a portion of the additional information requested by Reference 5.

U. S. Nuclear Regulatory Commission AEP:NRC:8054-02 Page 2 By Reference 8, I&M committed to provide the remainder of the requested additional information in an update to the GL 2004-02 response no later than December 31, 2007. This commitment was consistent with the NRC expectation, stated in Reference 150, that PWR licensees submit supplemental responses by December 31, 2007.

By Reference 151, the NRC authorized an extension to February 29, 2008, for submittal of supplemental responses. to this letter provides the supplemental response to GL 2004-02 for CNP.

The information in this supplement supersedes that provided in References 2, 3, 4, 7, and 8. provides general figures. provides jet impingement testing photographs. Attachment 6 lists each RAI question from Reference 5 and provides a reference to the section of Attachment 3 in which the requested information is provided, and/or provides other information to address the question. Attachment 7 provides the new regulatory commitments made in this letter in tabular form.

Should you have any questions, please contact Mr. James M. Petro, Jr., Regulatory Affairs Manager, at (269) 466-2491.

Sin ce r Iy, 4M~rk'A. Pe e Site Vice President JRW/rdw Attachments:

1.

References

2.

Abbreviations and Acronyms

3.

Supplemental Response to GL 2004-02 and Request for Additional Information

4.

General Figures

5.

Jet Impingement Testing Photographs

6.

Response to NRC Request for Additional Information

7.

Regulatory Commitments c:

J. L. Caldwell - NRC Region III K. D. Curry - AEP Ft. Wayne (w/o attachments)

J. T. King - MPSC (w/o attachments)

MDEQ - WHMD/RPMWS (w/o attachments)

NRC Resident Inspector P. S. Tam - NRC Washington, DC

U. S. Nuclear Regulatory Commission Page 3 AEP:NRC:8054-02 AFFIRMATION I, Mark A. Peifer, being duly sworn, state that I am Site Vice President of Indiana Michigan Power Company (I&M), that I am authorized to sign and file this request with the Nuclear Regulatory Commission on behalf of I&M, and that the statements made and the matters set forth herein pertaining to I&M are true and correct to the best of my knowledge, information, and belief.

Indiana Michigan Power Company Site Vice President SWORN TO AND SUBSCRIBED BEFORE ME THIS

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