05000318/LER-2002-001, Re Pump Flexible Drive Gear Wear Causes Emergency Diesel Generator Inoperability
| ML020810039 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 03/20/2002 |
| From: | Katz P Constellation Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER-02-001-00 | |
| Download: ML020810039 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 3182002001R00 - NRC Website | |
text
Peter E. Katz Plant General Manager 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410 495-4101 Constellation I
Nuclear Calvert Cliffs Nuclear Power Plant A Member of the Constellation Energy Group March 20, 2002 U.S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit No. 2; Docket No. 50-318; License No. DPR 69 Licensee Event Report 2002-001 Pump Flexible Drive Gear Wear Causes Emergency Inoperability Diesel Generator The attached report is being sent to you as required under 10 CFR 50.73 guidelines.
questions regarding this report, we will be pleased to discuss them with you.
Should you have PEKICDS/bjd Attachment cc:
R. S. Fleishman, Esquire J. E. Silberg, Esquire Director, Project Directorate I-1, NRC D. M. Skay, NRC H. J. Miller, NRC Resident Inspector, NRC R. I. McLean, DNR
't -ins
Abstract
On January 24, 2002 during a routine inspection of Calvert Cliffs 2A Emergency Diesel Generator (EDG), it was discovered that the pump flexible drive gear that drives auxiliary pumps necessary for diesel operation, was pitted. The EDG was required to remain out-of-service for a time period greater than allowed under the plant's Technical Specifications.
Enforcement discretion was requested and granted by Nuclear Regulatory Commission to allow the Unit to continue operation until February 2, 2002 while the pump flexible drive gear was replaced. The gear was replaced and 2A EDG was returned to service at 2:35 pm on January 31, 2002.
The cause of the event was misalignment of the pump flexible drive gear. This caused abnormal pitting to occur on the pump flexible drive gear.
The other similar EDGs at Calvert Cliffs were inspected for similar problems and none were found. A root cause analysis is in progress and additional actions will be implemented based on the results.
NRCL; F-KM 366 (f-2UU1)
(If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A)
February 2, 2002 was evaluated by Calvert Cliffs personnel and NRC (Reference NOED 2002-01-01) and concluded not to involve any undue impact on the health and safety of the public. Based on these conclusions, this event had no adverse impact on the health and safety of the public.
This event is considered reportable in accordance with 10 CFR 50.73(a)(2)(i)(B), Any event or condition prohibited by the plants Technical Specifications. Although NRC Region I granted enforcement discretion for Technical Specification 3.8.1 for a period of six days, the plant was not in compliance with the Technical Specification from 03:00 on January 27, 2002 until 2A EDG was returned to service at 2:35 pm on January 31, 2002.
IV.
CORRECTIVE ACTIONS
The following corrective actions were taken as a result of this event:
- 1.
Various pumps and pump drive gears including the pump flexible drive gear were replaced and the 2A EDG was returned to service on January 31, 2002. The replaced parts will be sent to the manufacturer for inspection.
- 2.
The other similar EDGs (Fairbanks-Morse) at Calvert Cliffs were inspected for a similar problem with their pump flexible drive gears. No abnormal wear or conditions were found.
- 3.
A formal root cause analysis concerning this event is in progress. Additional corrective actions may be implemented as determined by the results of this causal analysis.
V.
ADDITIONAL INFORMATION
A.
Affected Component Identification IEEE 803 IEEE 805 System Component or System EIIS Function ID Emergency Diesel Generator DG EK Flexible Drive Gear GR EK Auxiliary Feedwater Flow Control Valve FCV BA B.
Previous Similar Events
There have been no previous similar events at Calvert Cliffs involving a failure or degradation of the pump flexible drive gear.