ML081970618
| ML081970618 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 07/18/2008 |
| From: | Joel Wiebe NRC/NRR/ADRO/DORL/LPLIII-2 |
| To: | Pardee C Exelon Generation Co |
| Wiebe, Joel NRR/DORL/LPL3-2, 415-6606 | |
| References | |
| TAC MD7539, TAC MD7540 | |
| Download: ML081970618 (4) | |
Text
July 18, 2008 Mr. Charles G. Pardee Chief Nuclear Officer and Senior Vice President Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
QUAD CITIES NUCLEAR POWER STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT TO ESTABLISH TOTAL BATTERY CONNECTOR RESISTANCE ACCEPTANCE CRITERIA IN TECHNICAL SPECIFICATIONS (TAC NOS. MD7539 AND MD7540)
Dear Mr. Pardee:
By letter to the Nuclear Regulatory Commission (NRC) dated December 21, 2007, Exelon Generation Company, LLC, submitted a request to establish total battery connector resistance acceptance criteria in technical specifications surveillance requirements 3.8.4.2 and 3.8.4.5, for the Quad Cities Nuclear Power Station, Units 1 and 2.
The NRC staff is reviewing your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on July 9, 2008, it was agreed that you would provide a response 30 days from the date of this letter.
The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRC=s goal of efficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-6606.
Sincerely,
/RA/
Joel S. Wiebe, Senior Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-254 and 50-265
Enclosure:
Request for Additional Information cc w/encl: See next page
Mr. Charles G. Pardee July 18, 2008 Chief Nuclear Officer and Senior Vice President Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
QUAD CITIES NUCLEAR POWER STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT TO ESTABLISH TOTAL BATTERY CONNECTOR RESISTANCE ACCEPTANCE CRITERIA IN TECHNICAL SPECIFICATIONS (TAC NOS. MD7539 AND MD7540)
Dear Mr. Pardee:
By letter to the Nuclear Regulatory Commission (NRC) dated December 21, 2007, Exelon Generation Company, LLC, submitted a request to establish total battery connector resistance acceptance criteria in technical specifications surveillance requirements 3.8.4.2 and 3.8.4.5, for the Quad Cities Nuclear Power Station, Units 1 and 2.
The NRC staff is reviewing your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on July 9, 2008, it was agreed that you would provide a response 30 days from the date of this letter.
The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRC=s goal of efficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-6606.
Sincerely,
/RA/
Joel S. Wiebe, Senior Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-254 and 50-265
Enclosure:
Request for Additional Information cc w/encl: See next page DISTRIBUTION:
PUBLIC LPL3-2 R/F RidsNrrDorlLpl3-2 RidsNrrLATHarris RidsOgcRp RidsAcrsAcnw&mMailCenter RidsRgn3MailCenter RidsNrrDorlDpr RidsNrrPMQuadCities ADAMS Accession Number: ML081970618 OFFICE LPL3-2/PM LPL3-1/LA LPL3-2/BC NAME JWiebe (CGratton for)
THarris RGibbs (CGratton for)
DATE 07/18/08 07/18/08 07/18/08 OFFICIAL RECORD COPY
Quad Cities Nuclear Power Station, Units 1 and 2 cc:
Corporate Distribution Exelon Generation Company, LLC Via e-mail Quad Cities Distribution Exelon Generation Company, LLC Via e-mail Quad Cities Resident Inspector U.S. Nuclear Regulatory Commission Via e-mail David C. Tubbs MidAmerican Energy Company Via e-mail Managing Senior Attorney MidAmerican Energy Company Via e-mail Chairman Rock Island County Board of Supervisors Via e-mail Illinois Emergency Management Agency Division of Disaster Assistance & Preparedness Via e-mail
ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION QUAD CITIES NUCLEAR POWER STATION, UNITS 1 AND 2 DOCKET NOS. 50-254 AND 50-265 In reviewing the Exelon Generation Company=s (Exelon=s) submittal dated December 21, 2007, related to the request to establish total battery connector resistance acceptance criteria in technical specifications (TS) surveillance requirements (SR) 3.8.4.2 and 3.8.4.5, for the Quad Cities Nuclear Power Station (QCNPS), Units 1 and 2, the Nuclear Regulatory Commission (NRC) staff has determined that the following information is needed in order to complete its review:
- 1. In the November 28, 2006, Component Design Bases Inspection report referenced in your license amendment request, the NRC inspectors identified that the 125 volt direct current safety-related batteries would be incapable of meeting their design basis function if the inter-cell connection resistance were allowed to increase to the existing TS allowed value (i.e., 150 micro-ohms). Describe the basis for maintaining the existing150 micro-ohm inter-cell connection resistance value in TS SR 3.8.4.2 and 3.8.4.5.
- 2. In the license amendment request, the license stated that in response to the nonconservative TS value (i.e., 150 micro-ohms) it has initiated a compensatory measure to ensure safety-related battery operability by declaring the 125 and 250 volt direct current batteries inoperable if any inter-cell resistance exceeded 70 micro-ohms.
Describe the methodology and calculation used to determine the inter-cell resistance value of 70 micro-ohms. Does this value represent the worst-case inter-cell resistance (i.e., the operability limit)?
- 3. Describe the controls that will be implemented to direct the QCNPS staff how and when (i.e., how frequently?) to update the Individual Battery Total Connector Resistance Acceptance Criteria that you proposed locating in the TS bases.