Induced nuclear reactions: processes – systems – and elements – With control of reactor – By movement of control element or by release of neutron...
Patent
1992-08-14
1994-01-04
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
With control of reactor
By movement of control element or by release of neutron...
376225, G21C 706
Patent
active
052767191
ABSTRACT:
A hydraulic control rod drive for a nuclear reactor, with a a reactor plenum enclosing the drive, comprises first and second hollow bodies together forming a cylinder and a hollow piston. Working fluid is supplied through one of the hollow bodies. The first hollow body is stationary and the second hollow body is disposed coaxially around the first hollow body. The two hollow bodies define an annular gap therebetween so as to allow axial reciprocating movement of the second hollow body, which forms a carrier body for control elements of the control rod. The second hollow body can be lifted, lowered or suspended by feeding working fluid. A portion of the fluid is removed from the inner space via a throttle passage. A positional measurement system determines the relative displacement of the second hollow body by measuring an ultrasonic measurement path. The system includes an ultrasound reflector and an ultrasonic transducer rigidly mounted remote from the ultrasound reflector. Provisions are made for venting the inner space through venting channels which open into the reactor plenum at a security distance from the measurement path so as not to adversely affect the ultrasonic measurement.
REFERENCES:
patent: 3775247 (1973-11-01), Ode et al.
patent: 3941653 (1976-03-01), Thorp, II
patent: 4035230 (1977-07-01), Bevilacqua
patent: 4826648 (1989-05-01), Savary
patent: 4826649 (1989-05-01), Batheja et al.
patent: 4961897 (1990-10-01), Chevereau
Batheja Pramod
Meier Werner
Rau Peter
Chelliah Meena
Greenberg Laurence A.
Lerner Herbertt L.
Siemens Aktiengesellschaft
Wasil Daniel D.
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