The application of two-out-of-three logic for the control of electric motor operated valves in CANDU safety systems

Journal Article · Sat Sep 01 00:00:00 EDT 1984 · IEEE Trans. Power Appar. Syst.; (United States)

DOI:https://doi.org/10.1109/TPAS.1984.318240· OSTI ID:6060865

Basso, R; McCutcheon, R G; Rajagopalan, R R

Traditionally, the operation of electric motor operated (EMO) valves has been controlled by a position limit switch and a torque limit switch which are part of the actuator. A malfunction or improper maintenance of either of these switches has resulted in numerous actuator failures. The reliability of EMO valves and, in the case of nuclear power plants the frequency of forced shutdowns could be significantly improved by using two-out-of-three logic in the control circuits. The feasibility of mounting additional switches on the valve and the control circuits was verified in tests and has been assessed as suitable for both new and existing nuclear installations.

• Research Organization: Ontario Hydro Toronto, Ontario
• OSTI ID: 6060865
• Journal Information: IEEE Trans. Power Appar. Syst.; (United States), Vol. PAS-103:9
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
ENGINEERED SAFETY SYSTEMS
VALVES
LOGIC CIRCUITS
CANDU TYPE REACTORS
CONTROL
ELECTRIC MOTORS
FEASIBILITY STUDIES
OPTIMIZATION
RELIABILITY
SWITCHES
CONTROL EQUIPMENT
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
EQUIPMENT
FLOW REGULATORS
HEAVY WATER MODERATED REACTORS
MOTORS
PRESSURE TUBE REACTORS
REACTORS
THERMAL REACTORS
220900* - Nuclear Reactor Technology- Reactor Safety
210400 - Power Reactors
Nonbreeding
Otherwise Moderated or Unmoderated