ML022261015

Summary of the July 25, 2002, D.C. Cook Public Meeting

ML022261015
Person / Time
Site:	Cook   (DPR-058, DPR-074)
Issue date:	08/12/2002
From:	Passehl D Division Reactor Projects III
To:	Bakken A American Electric Power Co
References
EA-01-286
Download: ML022261015 (6)

Text

August 12, 2002 Mr. A. C. Bakken III Senior Vice President Nuclear Generation Group American Electric Power Company 500 Circle Drive Buchanan MI 49107

SUMMARY

OF THE JULY 25, 2002, D. C. COOK PUBLIC MEETING

Dear Mr. Bakken:

On July 25, 2002, the Nuclear Regulatory Commission (NRC) held a public meeting at the NRC Region III office in Lisle, Illinois. The meeting was a Regulatory Conference to discuss a preliminary Yellow finding involving the essential service water debris intrusion event that occurred at the D.C. Cook Nuclear Power Plant on August 29, 2001. A Yellow finding is described as having substantial safety significance. Formal presentations were made by the Indiana Michigan Power Company (licensee) staff. Enclosure 1 is a list of attendees for the meetings, and a copy of the slides used by the licensee is provided as Enclosure 2.

Your Site Vice President opened the conference and remarked that the maintenance practices on the essential service water (ESW) pump discharge strainer basket that led to the event were unacceptable. However, your staffs internal evaluation concluded that the debris intrusion event was less significant than the preliminary Yellow level initially determined by the NRC.

Your Regulatory Affairs Manager provided an overview of the event, including the sequence of events, root and contributing causes, and corrective actions. Your System Engineering and Event Recovery Managers discussed a revised internal risk significance determination assessment of the finding. As a result of new information and considerations, your staff revised the overall probability scale used to characterize inputs to the assessment and the probability that sufficient debris was available in the forebay for ingestion into the essential service water system. Your staff also clarified their assumption that the operator recovery actions should be considered independent for each of the two units. Based upon these changes, your staff concluded that the core damage frequencies for both Units 1 and 2 and the change in large early release frequency for Unit 2 were below the greater-than-Green threshold. The change in large early release frequency for Unit 1 was determined to be marginally above the Green-to-White threshold. However, your staff stated that conservatisms regarding charging system unit cross tie capabilities and availability of 69 kV offsite power were not credited in your latest significance determination assessment.

A. Bakken Your Nuclear Technical Services Director summarized the presentation stating that the overall risk significance of the essential service water debris intrusion event was Green. Closing remarks were provided by you and your Site Vice President, when you reiterated that the significance of the debris intrusion event was not Yellow as preliminarily determined by NRC.

Sincerely,

/RA/

David Passehl, Acting Chief Branch 6 Division of Reactor Projects Docket Nos. 50-315; 50-316 License Nos. DPR-58; DPR-74

Enclosures:

1.

List of Meeting Attendees 2.

Licensees Slide Presentation cc w/encl:

J. Pollock, Site Vice President M. Finissi, Plant Manager R. Whale, Michigan Public Service Commission Michigan Department of Environmental Quality Emergency Management Division MI Department of State Police D. Lochbaum, Union of Concerned Scientists

DOCUMENT NAME: G:\\Cook Public Meetings\\ML022261015.wpd To receive a copy of this document, indicate in the box "C" = Copy w/o att/encl "E" = Copy w/att/encl "N" = No copy OFFICE RIII RIII RIII NAME INetzel/trn KOBrien DPassehl DATE 08/ /02 08/12/02 08/12/02 OFFICIAL RECORD COPY

A. Bakken ADAMS Distribution:

WDR DFT JFS2 RidsNrrDipmIipb GEG HBC BJK1 C. Ariano (hard copy)

DRPIII DRSIII PLB1 JRK1 D.C. Cook Nuclear Plant July 25, 2002 Public Meeting Essential Service Water Debris Intrusion Event of August 29, 2001 Name Organization Jim Dyer NRC Geoffrey Grant NRC Anton Vegel NRC David Passehl NRC Singh Bajwa NRC Bill Borchardt NRC Sonia Burgess NRC Roy Caniano NRC James Caldwell NRC Cynthia Carpenter NRC Mike Cheok NRC Brent Clayton NRC Doug Coe NRC Joe Colaccino NRC Frank Congel NRC Kevin Coyne NRC Laura Dudes NRC Johnny Eads NRC E. Goldfeiz NRC Jennifer Dixon-Herrity NRC Steven Jones NRC Brian Kemker NRC Peter Koltay NRC Dan Merzke NRC Name Organization James Neurauter NRC Kenneth OBrien NRC Dan ONeal NRC John Stang NRC Marvin Sykes NRC Chris Bakken AEP Joe Pollock AEP Scot Greenlee AEP Gordon Arent AEP Bob Coward AEP Pam Cowan AEP John Giessner AEP Donald Hafer AEP J. T. Hawley AEP David Jenkins AEP William Schalk AEP Toby Woods AEP Vesna Dimitrijevic Framatome Dan Salter HGP, Inc.

C. R. Grantom STP Thomas Poindexter Winston & Strawn