ML040900366
| ML040900366 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear, Limerick  |
| Issue date: | 03/25/2004 |
| From: | Collins T Fairbanks Morse Engine |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML040900366 (2) | |
Text
0312512004 U.S. Nuclear Regulatory Commission OperationsCenter Event Report PaeI General Information or Other (PAR) Event# 40610 Rep Org: FAIRBANKS MORSE ENGINE Notification Date I Time: 03/25/2004 17:56 (EST)
Supplier: FAIRBANKS MORSE ENGINE Event Date I Time: 03/25/2004 (CST)
Last Modification: 03125/2004 Region: 3 Docket #:
City: BELOIT Agreement State: Yes County: License #:
State: WI NRC Notified by: TODD COLLINS (FAX) Notifications: JOHN MADERA R3 HQ Ops Officer: STEVE SANDIN RONALD BELLAMY R1 Emergency Class: NON EMERGENCY DAVID GRAVES R4 10 CFR Section: VERN HODGE NRR 21.21 UNSPECIFIED PARAGRAPH JACK FOSTER NRR PART 21 NOTIFICATION INVOLVING POTENTIAL SAFETY HAZARD FOR BLOWERS ON OP ENGINES
Subject:
Roots Blower on OP Engines "On March 23, 2004, Fairbanks Morse Engine evaluation determined a potential safety hazard exists for blowers (P/N 16609294) on OP engines. It is possible that the aluminum rotors can slip on the steel shaft and cause rotor-to-rotor or rotor-to-housing contact which could cause blower failure and inability of engine to perform its safety function.
"The defect was caused by improper cleaning of the shaft prior to casting the rotor onto the shaft. This causes an inadequate bond and allows the aluminum rotor to move axially on the steel shaft. Sample testing of rotors has found this condition to exist to varying degrees on approximately 75% of rotors produced between 1998 and 2003.
"(4) blowers were shipped to nuclear utilities that may be affected:
"Utility Site Blower S/N "Exelon Limerick (RB813A, RB3871, RB816)
"Entergy ANO-2 (RB814)
"To date, no engine failures have been experienced as a result of this problem. However, the potential exists. All slipped rotors have been found during routine maintenance inspections. This condition has been found to manifest itself within a low number of hours of operation. Therefore, the longer the rotors run and maintain proper clearance, the less likely they are to be affected by this condition.
"The affected utilities will be notified to evaluate inspection results and replace as necessary."
- 03/25*/2004 THU 17:56 FAX FAIRBANKS MORSE PIJRCH 0OO1/001
- FAIRBANKS M\/ORS E 701 White Avenue Beloli WisconsIn 53511 Tel: 608364.8424 Faxc 608.364.8417 Ted.stevenson faarbanksmocse.corn March 25,2004 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Roots Blower on OP Engines On March 23,2004, Fairbanks Morse Engine evaluation determined a potential safety hazard exists for blowers (PIN 16609294) on OP engines. It is possible that the aluminum rotors can slip on the steel shaft and cause rotor-to-rotor or rotor-to-housing contact which could cause blower failure and inability of engine to perform Its safety function.
The defect was caused by improper cleaning of the shaft prior to casting the rotor onto the shaft. This causes an inadequate bond and allows the aluminum rotor to move axially on the steel shaft. Sample testing of rotors has found this condition to exist to varying degrees on approximately 75% of rotors produced between 1998 and 2003.
(4) blowers were shipped to nuclear utilities that may be affected; Utilit Site Blower SIN Exelon Limerick (RB813A, RB3871, RB816)
Entergy ANO-2 (RB814)
To date, no engine failures have been experienced as a result of this problem.
However, the potential exists. All slipped rotors have been found during routine maintenance inspections. This condition has been found to manifest itself within a low number of hours of operation. Therefore, the longer the rotors run and maintain proper clearance, the less likely they are to be affected by this condition.
The affected utilities will be notified to evaluate inspection results and replace as necessary.
Sincerely, Todd Collins Manager, QA an EnPro Industries company 03/25/2004 THU 18:04 [TX/RX NO 5660] l 001