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The control rod drive mechanism is used to withdraw or insert the full length rods. The complete drive mechanism, shown in Figure 8.1-2, consists of the internal latching assemblies (grippers), the rod drive shaft assembly, the pressure housing, and the magnetic coil stack. Every single rod has its own drive mechanism. The control rod drive ...
electromechanical control rod drive mechanisms (CRDMs) and incore temperature instrumentation supports are attached to the reactor vessel head. The bottom of the
control rod drive mechanism. The vertical position of the rod drive shaft within the rod position detector produces an ac electrical output signal which is directly proportional to the rod=s vertical position. This signal is transmitted, by means of a shielded cable, to a signal conditioning circuit, which converts the ac rod position
The main advantages of Westinghouse’s visual inspection system are: • Compact design of the inspection system allowing all penetrations to be inspected • Visual inspection device allowing 360° video recordings of the canopy weld • Brushing tool allowing complete visual inspection of the weld
x Special Control Rod Drive Mechanism (CRDM) individual coil exercise feature removes “crud” buildup upon operator demand without taking a step. x The power cabinet monitors and analyzes the current flow to the CRDM coils to confirm that the CRDM grippers
The Rod Control System Initial Training Course will prepare the successful student to maintain the Rod Control System in accordance with plant procedures and vendor technical manual using all appropriate Human Performance tools. This course is intended for I&C technicians and system engineers.
The Westinghouse Online Rod Control System Course will allow the successful student to understand how the Rod Control System should operate under normal conditions. The student will also learn how to use schematic drawings to trace signals and find test points, and use the Troubleshooting Flow Charts to diagnose problems.
