ML040920306

Fairbanks Morse Engine, Safety Hazard Roots Blower on OP Engines

ML040920306
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: ML040920306 (3)

Text

FAIRBANKS MORSE 701 White Avenue Beloit, Wisconsin 53511 Tel: 608.364.8424 Fax: 608.364.8417 Ted.stevensonafairbanksmorse.com 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 foirbliweris(P/N16609294)6If-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 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 ErPro Industries company

-- FAIRBANKS MORSE A 701 White Avenue Beloit. Wisconsin 53511 Tel: 608.364.8424 Fax: 608.364.8417 Ted.stevenson@fairbanksmorse.com March 25, 2004 Entergy Operations, Inc PO Box 31995 Jackson, MS 39286-1995 Attention:..Manager,.Operating Experience M-ECH-595

Subject:

IOCFR21 Attached please find notification made to the NRC for items shipped to ANO on PO POR98090.

Sincerely, Todd Collins Manager, Quality Assurance an EnPro Industries company

FAIRBANKS MORSE I 0IrdluiI e Q

701 White Avenue Beloit Wisconsin 53511 Tel: 608.364.8424 Fax: 608.364.8417 Ted.stevenson@fairbanksmorse.con March 25, 2004 Exelon Nuclear Manager- Licensing Section Correspondence Control Desk PO Box 160

_--.-Kennett Square,.PAJ19348-

Subject:

IOCFR21 Attached please find notification made to the NRC for items shipped to Limerick.

The (3) orders affected are:

90 167610 REL 348495 90 167610 REL 348425 90 167610 REL 348293 Sincerely, Todd Collins

-Manager, Quality-Assuranca -

an EnPro Industries company