Gauge plate for use in customizing a replacement upper core plate in a nuclear reactor, and method of using the gauge plate
A gauge plate is described for use in customizing replacement upper core plate inserts of a nuclear reactor of the type including a pressure vessel, a core barrel disposed within the pressure vessel, a lower internal structure disposed in the core barrel and including a baffle plate arrangement, and an upper internals structural package having an upper core plate at its lower end. The gauge plate comprises: a circular metal plate of a known diameter corresponding substantially to that of the upper core plate of the nuclear reactor to be gauged; U-shaped gauging slots formed in the peripheral surface of the gauge plate and extending between its major surfaces; first means for positioning the gauge plate within the nuclear reactor vessel to be gauged; second means, disposed on the gauge plate, for positioning the gauge plate relative to the baffle plate arrangement of the reactor to be gauged; gauge means in the gauge plate for determining the actual position of the gauge plate relative to the baffle plate arrangement; and remotely controlled measuring means, disposed on the gauge plate, for measuring the clearances between each of the U-shaped gauging slots and the adjacent surfaces of a respective guide pin and the clearance between the peripheral surface of the gauge plate and the inner surface of the core barrel adjacent each gauging slot, and for providing an indication of the measured clearances at a remote location.
- Assignee:
- Westinghouse Electric Corp., Pittsburgh, PA
- Patent Number(s):
- US 4707325
- OSTI ID:
- 5856925
- Resource Relation:
- Patent File Date: Filed date 3 Jul 1986
- Country of Publication:
- United States
- Language:
- English
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