Geometrical instruments – Gauge – With calibration device or gauge for nuclear reactor element
Patent
1990-05-22
1991-03-26
Wasil, Daniel D.
Geometrical instruments
Gauge
With calibration device or gauge for nuclear reactor element
33533, G21C 1700
Patent
active
050018400
ABSTRACT:
In a boiling water nuclear reactor having its core, fuel support casting, and control rod guide tubes removed to expose the core plate, an apparatus for the repair and replacement of the control rod drive housing at the bottom extremity of the reactor vessel is disclosed. The apparatus registers to a hole in the core plate and its corresponding guide pin. A mating fixture on the depending extremity of the shaft of the apparatus precisely fits and mates to the top of the control rod drive housing. The alignment device includes cross electronic levels sealed for submersion which levels remotely transfer through attached wiring the precise angularity between the top of the control rod drive housing on one hand and the corresponding and overlying hole in the core plate on the other hand.
REFERENCES:
patent: 4704801 (1987-11-01), Frizot et al.
Deaver Gerald A.
Dixon Robert C.
Erbes John G.
Offer Henry P.
Punches James R.
General Electric Company
Schroeder Robert R.
Wasil Daniel D.
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