ML080100695
| ML080100695 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 01/14/2008 |
| From: | Tam P NRC/NRR/ADRO/DORL/LPLIII-1 |
| To: | Rencheck M Indiana Michigan Power Co |
| tam P, NRR/ADRO/DORL, 415-1451 | |
| References | |
| TAC MD5931, TAC MD5932 | |
| Download: ML080100695 (4) | |
Text
January 14, 2008 Mr. Michael W. Rencheck Senior Vice President and Chief Nuclear Officer Indiana Michigan Power Company Nuclear Generation Group One Cook Place Bridgman, MI 49106
SUBJECT:
D. C. COOK NUCLEAR PLANT, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED AMENDMENT TO REDUCE MAXIMUM VENTILATION SYSTEM FILTER PRESSURE DROP (TAC NOS.
MD5931 AND MD5932)
Dear Mr. Rencheck:
In a letter dated June 13, 2007, Indiana Michigan Power Company submitted the subject application for amendment. The Nuclear Regulatory Commission (NRC) staff reviewed the information transmitted by that letter and has generated draft questions, which had been e-mailed to your staff on September 18, 2007 (Agencywide Document Access and Management System Accession No. ML072640058). The NRC staff discussed the draft questions with your staff in a telephone conference on January 10, 2008. After the discussion, the NRC staff finalized the questions into a request for additional information (RAI) enclosed.
Please respond to the RAI within 30 days of the date of this letter. Feel free to contact me if you need clarification of this RAI.
Sincerely,
/RA/
Peter S. Tam, Senior Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-315 and 50-316
Enclosure:
Request for Additional Information cc: See next page
ML080100695 OFFICE LPL3-1\\PM LPL3-1/LA DSS/SCVB/BC LPL3-1/BC (A)
NAME PTam THarris RDennig*
CMunson DATE 1/11/08 1/11/08 9/13/07*
1/14/08
- RAI transmitted by memo of 9/13/07.
REQUEST FOR ADDITIONAL INFORMATION D.C. COOK NUCLEAR PLANT, UNITS 1 AND 2 DOCKET NOS. 50-315 AND 50-316
Reference:
Letter, J. N. Jensen to NRC, June 13, 2007 (ADAMS Accession No. ML071730047)
The licensee determined that the existing acceptance values in the Technical Specifications (TS) are non-conservative. The licensee implemented administrative controls to impose a more restrictive acceptance criterion than the TS acceptance values pending issuance of the requested amendment. The licensee stated that calculations for the proposed surveillance testing acceptance criteria are based on applicable fan curves and ventilation industry handbook data on system and component resistances. The allowable filter pressure drop is based on filter vendor recommendations.
The NRC staff agrees that the existing non-conservative acceptance criterion should be revised.
However, per 10 CFR Part 50.36(c)(3), the NRC staff believes that the acceptance criterion should be based on the total filter assembly pressure drop needed to assure the required minimum air flows. Filter vendor recommendations should be used to determine when to replace individual banks of filters. In order to complete the evaluation of this license amendment, the NRC staff needs the following additional information:
(1)
Are the calculated maximum allowable filter assembly pressure drop for the various systems greater than the combined filter vendors= recommended maximum pressure drop values?
(2)
How do the handbook resistance values compare with the Aas installed@ and Aas operated@ pressure loss values? Are the Aas installed@ pressure loss values from a testing and balancing (TAB) report?
(3)
The licensee indicated that the less than 4 inches water gauge acceptance criterion is based on vendor recommended values for the HEPA/charcoal adsorber assembly. Are pre-filters installed? If pre-filters are installed, why are they not included in the filter assembly total allowable pressure drop?
(4)
If testing (TAB or ANSI N509 '8.5.1) has not been performed, how does the licensee assure that the ventilation systems will provide the required minimum air flow at the requested maximum (less than 4 inches water gauge) filter assembly pressure drop?
Donald C. Cook Nuclear Plant, Units 1 and 2 cc:
Regional Administrator, Region III U.S. Nuclear Regulatory Commission Suite 210 2443 Warrenville Road Lisle, IL 60532-4351 Attorney General Department of Attorney General 525 West Ottawa Street Lansing, MI 48913 Township Supervisor Lake Township Hall P.O. Box 818 Bridgman, MI 49106 U.S. Nuclear Regulatory Commission Resident Inspector's Office 7700 Red Arrow Highway Stevensville, MI 49127 Kimberly Harshaw, Esquire Indiana Michigan Power Company One Cook Place Bridgman, MI 49106 Mayor, City of Bridgman P.O. Box 366 Bridgman, MI 49106 Special Assistant to the Governor Room 1 - State Capitol Lansing, MI 48909 Susan D. Simpson Regulatory Affairs Manager Indiana Michigan Power Company Nuclear Generation Group One Cook Place Bridgman, MI 49106 Michigan Department of Environmental Quality Waste and Hazardous Materials Div.
Hazardous Waste & Radiological Protection Section Nuclear Facilities Unit Constitution Hall, Lower-Level North 525 West Allegan Street P. O. Box 30241 Lansing, MI 48909-7741 Lawrence J. Weber, Plant Manager Indiana Michigan Power Company Nuclear Generation Group One Cook Place Bridgman, MI 49106 Mark A. Peifer, Site Vice President Indiana Michigan Power Company Nuclear Generation Group One Cook Place Bridgman, MI 49106