ML071070009
| ML071070009 | |
| Person / Time | |
|---|---|
| Site: | Cook  (DPR-058, DPR-074) |
| Issue date: | 04/24/2007 |
| From: | Tam P NRC/NRR/ADRO/DORL/LPLIII-1 |
| To: | Nazar M Indiana Michigan Power Co |
| References | |
| GL-06-002, TAC MD0971, TAC MD0972 | |
| Download: ML071070009 (4) | |
Text
April 24, 2007 Mr. Mano K. Nazar 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 - RESPONSE TO GENERIC LETTER (GL) 2006-02, GRID RELIABILITY AND THE IMPACT ON PLANT RISK AND THE OPERABILITY OF OFFSITE POWER (TAC NOS. MD 0971 AND MD0972)
Dear Mr. Nazar:
On February 1, 2006, the U.S. Nuclear Regulatory Commission (NRC) issued GL 2006-02 (Accession No. ML060180352) to all holders of operating licenses for nuclear power reactors except those which have permanently ceased operation and have certified that fuel has been removed from the reactor vessel. GL 2006-02 notified licensees of the NRC staffs need for information in four areas as follows:
(1)
Use of protocols between the nuclear power plant (NPP) and the transmission system operator (TSO), independent system operator (ISO), or reliability coordinator/authority (RC/RA) and the use of transmission load flow analysis tools (analysis tools) by TSOs to assist NPPs in monitoring grid conditions to determine the operability of offsite power systems under plant technical specifications. [The TSO, ISO, or RA/RC is responsible for preserving the reliability of the local transmission system; in GL 2006-02, the term TSO is used to denote these entities];
(2)
Use of NPP/TSO protocols and analysis tools by TSOs to assist NPPs in monitoring grid conditions for consideration in maintenance risk assessments; (3)
Offsite power restoration procedures in accordance with Section 2 of NRC Regulatory Guide (RG) 1.155, Station Blackout; and (4)
Loss of offsite power caused by grid failures at a frequency equal to or greater than once in 20 site-years in accordance with RG 1.155.
Subsequent to issuance of GL 2006-02, the NRC issued a Request For Additional Information (RAI) (Accession No. ML063380308) regarding the resolution of GL 2006-02 to 63 of 65 holders of operating licenses for nuclear power reactors. The RAI requested licensees respond to questions in the following areas:
(a)
Switchyard minimum voltage;
M. K. Nazar (b)
Loss of real-time contingency analysis (RTCA) capability; (c)
Verification of RTCA predicted post-trip voltage; (d)
Identification of applicable single contingencies; (e)
Seasonal variation in grid stress (reliability and loss-of-offsite power (LOOP) probability; (f)
Interface with transmission system operator during extended plant maintenance.
By letter(s) dated March 31, 2006 (Accession No. ML061000316) and January 31, 2007 (Accession No. ML070370318) you responded to GL 2006-02 and the subsequent RAI. Based on the information you provided, the NRC staff concluded that the D. C. Cook units have maintained compliance with NRC regulatory requirements governing electric power sources and associated personnel training. Accordingly, the NRC staff considers your response to GL 2006-02 complete.
If you have any questions, please contact me 301-415-1451.
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 cc: See next page
ML071070009 OFFICE LPL3-1\\PM LPL3-1/LA EEEB\\BC LPL3-1/BC NAME PTam THarris GWilson LRaghavan DATE 4/19/07 4/18/07 4/23/07 4/24/07
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