Induced nuclear reactions: processes – systems – and elements – With control of reactor – By movement of control element or by release of neutron...
Patent
1996-04-29
1999-12-07
Behrend, Harvey E.
Induced nuclear reactions: processes, systems, and elements
With control of reactor
By movement of control element or by release of neutron...
376245, 324511, 324522, G21C 714, G21C 1700
Patent
active
059995831
ABSTRACT:
The electromagnetic drive mechanism for the control rods of a nuclear reactor has a stationary gripper and coil, a movable gripper and coil, and a lifting armature and coil for moving the movable gripper to advance or retract the control rods in steps. A coil current driver responsive to a controller provides currents to the coils individually and in combinations. During the operations, coil current signals are sensed, sampled, digitized and processed to generate coil current data such as amplitude as a function of time. The measured coil current data is compared to nominal current data as well as historical current data, and the historical data is updated or appended to include the measured data. The comparison includes a check for correct timing relationships, such as the timing of the current notch occurring due to increased inductance upon pull-in of a gripper. Additionally, voltages or currents between the ac power source and the coils can be monitored for isolating a failure to particular circuit elements.
REFERENCES:
patent: 4125432 (1978-11-01), Brooks, Jr. et al.
patent: 4363778 (1982-12-01), Abbot
patent: 4585609 (1986-04-01), Rat
patent: 4663576 (1987-05-01), Scarola et al.
patent: 4777010 (1988-10-01), Sato
patent: 4961898 (1990-10-01), Bogard et al.
patent: 5009834 (1991-04-01), Tessaro
patent: 5066451 (1991-11-01), Tessaro
patent: 5307384 (1994-04-01), King et al.
patent: 5329465 (1994-07-01), Arcella et al.
patent: 5392321 (1995-02-01), Gaussa, Jr. et al.
patent: 5485491 (1996-01-01), Salnick et al.
Hashemian, H. M. and Fain, R. E., "Experience With Measurement of Drop Time of Control and Shutdown Rods and Testing of CRDMs in Nuclear Power Plants," pp. 259-271, 1995.
Fain, R.E., Petersen, K.M. and Hashemian, H.M., "New Equipment for Rod Drop and Control Rod Drive Mechanism Timing Tests in PWRs," pp. 371-381, 1995.
Mitsubishi Heavy Industries, Ltd., "Control Rod Drive Mechanism Data Analyzing System," 1994.
Analysis and Measurement Services Corporation Technical Bulletin No. RD9401 "Rod Drop and CRDM Tests in PWRs," 1994.
Westinghouse Electric Corporation Descriptive Bulletin Nuclear I&C No. DB21N-504 "Automatic Multiple Rod Drop Test System," 1993.
Nucl. Eng. Int., pp. 40, 41, Jul. 1982.
Federico Panfilo Augustino
Patnesky, Jr. James Jerome
Pysnik Joseph
Behrend Harvey E.
Westinghouse Electric Company LLC
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