ML052850065

Minutes of Conference Call Regarding Dresden MSSV Setpoint Tolerance (Response to License Condition 4 from July 30, 2004 Amendment)

ML052850065
Person / Time
Site:	Dresden
Issue date:	10/24/2005
From:	Office of Nuclear Reactor Regulation
To:
References
Download: ML052850065 (4)

Text

October 24, 2005 LICENSEE: Exelon Generation Company, LLC FACILITY: Dresden Nuclear Power Station, Units 2 and 3

SUBJECT:

MINUTES OF CONFERENCE CALL REGARDING DRESDEN MSSV SETPOINT TOLERANCE (RESPONSE TO LICENSE CONDITION 4 FROM JULY 30, 2004 AMENDMENT)

The conference call between NRC staff and Exelon Generation Company, LLC (Exelon or the licensee) was held on October 7, 2005, from 2:30 P.M. to 3:15 P.M., with the attendees listed in . The purpose of the meeting was to discuss information provided by the licensee in a letter dated October 29, 2004, as supplemented by letters dating April 15 and May 26, 2005, responding to a license condition (item 4) imposed by a license amendment approved on July 30, 2004. This amendment increased the number of main steam safety valves (MSSVs) required to be operable from eight MSSVs to eight MSSVs and one safety/relief valve (S/RV),

and was based on a setpoint tolerance of +/-1 percent. The item 4 license condition required that the licensee submit, for NRC approval, values for the MSSV and S/RV setpoint tolerances and the tolerance uncertainty treatment methodology.

Specific subjects discussed in the conference call were:

1. Valve internals are inspected through Exelons internal procedures, therefore, NRC staff does not need to impose inspection of valve internals as a license condition.

2. Rather than having NRC approve values for the MSSV and S/RV setpoint tolerances and the tolerance uncertainty treatment methodology as outlined in the license condition (item 4), Exelon requests that NRC approve the methodology only. If NRC approves the methodology, Exelon will submit a setpoint that is consistent with the methodology.

3. Exelon would like to demonstrate that the design basis analysis will use setpoints for each valve greater than the setpoints determined by the methodology, in order to be more conservative.

The staff decided to have internal discussions on subjects 2 and 3 above, and inform Exelon of the results.

Attachment:

As stated

October 24, 2005 LICENSEE: Exelon Generation Company, LLC FACILITY: Dresden Nuclear Power Station, Units 2 and 3

SUBJECT:

MINUTES OF CONFERENCE CALL REGARDING DRESDEN MSSV SETPOINT TOLERANCE (RESPONSE TO LICENSE CONDITION 4 FROM JULY 30, 2004 AMENDMENT)

The conference call between NRC staff and Exelon Generation Company, LLC (Exelon or the licensee) was held on October 7, 2005, from 2:30 P.M. to 3:15 P.M., with the attendees listed in . The purpose of the meeting was to discuss information provided by the licensee in a letter dated October 29, 2004, as supplemented by letters dating April 15 and May 26, 2005, responding to a license condition (item 4) imposed by a license amendment approved on July 30, 2004. This amendment increased the number of main steam safety valves (MSSVs) required to be operable from eight MSSVs to eight MSSVs and one safety/relief valve (S/RV),

and was based on a setpoint tolerance of +/-1 percent. The item 4 license condition required that the licensee submit, for NRC approval, values for the MSSV and S/RV setpoint tolerances and the tolerance uncertainty treatment methodology.

Specific subjects discussed in the conference call were:

4. Valve internals are inspected through Exelons internal procedures, therefore, NRC staff does not need to impose inspection of valve internals as a license condition.

5. Rather than having NRC approve values for the MSSV and S/RV setpoint tolerances and the tolerance uncertainty treatment methodology as outlined in the license condition (item 4), Exelon requests that NRC approve the methodology only. If NRC approves the methodology, Exelon will submit a setpoint that is consistent with the methodology.

6. Exelon would like to demonstrate that the design basis analysis will use setpoints for each valve greater than the setpoints determined by the methodology, in order to be more conservative.

The staff decided to have internal discussions on subjects 2 and 3 above, and inform Exelon of the results.

Attachment:

As Stated Accession Number: ML052850065 OFFICE PM:LPD3-2 LA:LPD3-2 SC:EMEB SC:LPD3-2 PD:LPD3 NAME MBanerjee PCoates DCF for SLee GSuh HNieh DATE 10/18 /05 10/18/05 10/19/05 10/19/05 10/24/05 OFFICIAL RECORD COPY

LIST OF ATTENDEES DRESDEN CONFERENCE CALL OCTOBER 7, 2005 Maitri Banerjee, NRC Tanya Ford, NRC Gary Hammer, NRC Stacey Imboden, NRC Sharon Eldridge, Exelon Jim Krueger, Exelon Ken Nicely, Exelon Bob Ryback, Exelon Rick Swart, Exelon Bob Testin, Exelon Hossein Youseffnia, Exelon Attachment 1