ML073020239
| ML073020239 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 10/25/2007 |
| From: | Syrell T Constellation Energy Group |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML073020239 (4) | |
Text
P.O. Box 63 Lycoming, NY 13093 October 25, 2007 U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 ATTENTION:
SUBJECT:
Document Control Desk Nine Mile Point Nuclear Station Unit Nos. 1 and 2; Docket Nos. 50-220 and 50-410 2007 Summary ofRegulatory Commitment Changes This letter forwards a summary of regulatory commitment changes requiring NRC notification made in accordance with the guidance contained in NEI 99-04, Guidelines for Managing NRC Commitment Changes, Revision 0, during the period October 1, 2006 to October 1, 2007. By previous letter dated November 17, 2005, Nine Mile Point Nuclear Station, LLC (NMPNS) forwarded a summary of the commitment changes requiring NRC notification for the period of October 1, 2004 to October 1, 2005.
There were no commitment changes requiring NRC notification for the period from October 1, 2005 to October 1, 2006. to this letter identifies the commitment change, including a brief statement of the basis for the change and the source document.
Should you have any questions regarding the information in this submittal, please contact me at (315) 349-5219.
Very truly yours, TFSIMHSI
Attachment:
1.
2007 Summary ofRegulatory Commitment Changes
Document Control Desk October 25, 2007 Page 2 cc:
S. J. Collins, NRC M. J. David, NRC Resident Inspector, NRC
ATTACHMENT 1 2007
SUMMARY
OF REGULATORY COMMITMENT CHANGES Nine Mile Point Nuclear Station, LLC October 25, 2007 2007 Summary of Regulatory Commitment Changes UNIT: Nine Mile Point Unit 1 (NMPl)
Commitment:
Administrative controls limit the time that the primary containment vent and purge valves can be open to 90 hours0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> per year, excluding their use for inerting and deinerting during startup and shutdown when drywell entry is required.
Source Document:
Letter from C.Y. Mangan (Niagara Mohawk Power Corporation) to J. A. Zwolinski (NRC) dated April 30, 1986 (NMPIL 0053)
Revised Commitment:
Procedural controls provide specific criteria for opening the primary containment vent and purge valves during normal operation.
Justification for Change:
The 90 hour0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> per year time limit was initially imposed by the NRC as an interim measure due to concerns for the ability of the valves to close if initially open at the beginning of a LOCA event. This time limit was based on engineering judgment and not on any analytical requirement. Since then, the vent and purge valves have been demonstrated to be fully qualified to close in the required time under accident conditions to isolate the effected penetrations, and other concerns regarding isolation signals and valve resilient seal degradation have also been resolved. The specific procedural criteria for when the vent and purge valves are permitted to be open will ensure appropriate controls. Thus, use of the vent and purge valves will continue to be minimized and limited to reasons that are important to safe operation the plant, and the administrative controls for tracking the amount oftime the valves are open are not necessary.
Page 1 of 1