TRIAD; A decision support system for evaluating turbine rotor replacement decisions

Conference · Tue Jan 01 04:00:00 EST 1991 · Proceedings of the American Power Conference; (United States)

OSTI ID:5136084

Valverde, Jr, L J; Gehl, S M ^[1]; Jabbour, S J; Colville, G ^[2]

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1. Electric Power Research Inst., Palo Alto, CA (United States)
2. Decision Focus, Inc., Los Altos, CA (United States)

Rotors in high pressure (HP), intermediate pressure (IP), and low pressure (LP) steam turbines are critical components in a fossil fuel power plant. Their failure can have catastrophic consequences, and their replacement can cost millions of dollars and take six months or more. When forensic examinations reveal flaws in a rotor, or when temper embrittlement causes a degradation in materials properties, plant engineers have several options: they can continue to run the rotor, they can replace the rotor with a new one, or they can repair the rotor. This type of engineering evaluation is called a run/repair/replace decision. In addition, engineers can change the plant operating conditions and startup procedures to decrease the probability of failure of a questionable rotor. They can also shorten the interval between inspections or perform more detailed characterizations of rotor condition. In this paper the authors consider various aspects of the TRIAD system. The authors begin by describing the turbine rotor run/repair/replace problem, and then discuss how the methods of decision analysis can be used to formally evaluate this class of decision. The authors then discuss the software implementation of TRIAD, with particular emphasis on the system's inputs, and analysis. The paper concludes with a discussion of the strengths and limitations of the model, as well as anticipated future directions for this work.

• OSTI ID: 5136084
• Report Number(s): CONF-9104106--
• Conference Information: Journal Name: Proceedings of the American Power Conference; (United States) Journal Volume: 53
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200104* -- Fossil-Fueled Power Plants-- Components
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
COMPUTER CALCULATIONS
COST
DECISION MAKING
FOSSIL-FUEL POWER PLANTS
INSPECTION
MACHINERY
POWER PLANTS
ROTORS
SERVICE LIFE
START-UP
STEAM TURBINES
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
THERMAL POWER PLANTS
TURBINES
TURBOMACHINERY