ML033180600
| ML033180600 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 11/06/2003 |
| From: | Hovey R Exelon Generation Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| RHLTR: #03-0072, USI A-46 | |
| Download: ML033180600 (2) | |
Text
Exelens Exelon Generation www.exeloncorp.com Nuclear Dresden Generating Station 6500 North Dresden Road Morris, IL 60450-9765 Tel 815-942-2920 November 6, 2003 RHLTR: #03-0072 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 Dresden Nuclear Power Station, Units 2 and 3 Facility Operating License Nos. DPR-19 and DPR-25 Docket Nos. 50-237 and 50-249
Subject:
Delay in Completion of Unresolved Safety Issue (USI) A-46 Commitment
Reference:
Letter from R. J. Hovey (EGC) to U. S. NRC, "Delay in Completion of Unresolved Safety Issue (USI) A-46 Commitment," dated July 17, 2003 In the referenced letter, Exelon Generation Company, LLC (EGC) notified the NRC of a delay in completing actions related to USI A-46, Seismic Qualification of Equipment in Operating Plants," for Dresden Nuclear Power Station (DNPS), Unit 3. In part, the referenced letter identified six work orders that remain open associated with DNPS Unit 3 outliers, which were incorrectly scheduled to be completed by the end of the October 2003 Unit 2 refueling outage due to a misunderstanding of the original commitment. EGC committed to complete these remaining six work orders by the end of the Unit 2 refueling outage. However, upon further review, it has been determined that one of the work orders (i.e., the work order associated with Automatic Depressurization System (ADS) auto blowdown relay replacement), could not be done safely online and the associated commitment completion date must be changed.
The ADS auto blowdown relay replacement modification was planned as online work when it was issued. However, during a final walkdown DNPS personnel identified replacement of these relays would require removing three internal panel stiffeners that are blocking three of the five relays. Given this configuration of the panel, removal of the panel stiffeners and replacement of the relays online could easily cause an inadvertent ADS actuation and therefore would be imprudent. Other alternatives such as qualifying the existing relays with further evaluation were considered but determined not to be feasible.
Therefore, the auto blowdown relay replacement will be completed during the next Unit 3 refueling outage, D3R18, currently scheduled for fall 2004.
AC435
All the remaining Unit 2 USI A-46 outlier resolution work was completed within the commitment dates (i.e. during the current Unit 2 refueling outage).
Should you have any questions concerning this letter, please contact Mr. Jeff Hansen, Regulatory Assurance Manager, at (815) 416 - 2800.
Respectfully, V I R. J. Hovey Site Vice President Dresden Nuclear Power Station cc:
Regional Administrator-NRC Region IlIl NRC Senior Resident Inspector - Dresden Nuclear Power Station