ML040910283

Letter Informing of Potential Safety Hazard Associated with the Use of Abb Turbocharger Model VTC-304 on OP Engines Only

ML040910283
Person / Time
Site:	Crystal River
Issue date:	02/16/2004
From:	Collins T Fairbanks Morse Engine
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML040910283 (1)

Text

FAIRBANKS MORSE FI &'LIle'i uI 701 White Avenue Beloit, Wisconsin 53511 Tel: 608.364.8424 Fax: 608.364.8417 Td .stevenson@fairbanksmorse.com Feqruary 16, 2004 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

ABB Turbocharger Model VTC-304 On February 12, 2004, Fairbanks Morse Engine evaluation determined a potential safety hazard associated with the use of ABB turbocharger model VTC-304 on OP engines only.

Torsional resonance has been found in the rotating assembly which is excited by exhaust pulses. The resonance manifests itself as either a bent or broken shaft, slipped compressor wheel, cracked compressor wheel or complete rupture of the compressor set. Once failure occurs, engine power cannot be sustained.

This condition is corrected by machining the rotating assembly to tune the natural frerquency away from operating conditions.

ThN3 only affected site is Crystal River 3. (6) turbos have been shipped to this site.

None of the turbos have been installed and all are in storage. The FM parts department will arrange to have the turbos returned to the factory to have the necessary machining performed.

Sincerely, Todd Collins Manager, QA an -nPro Industries company