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Title: Float level switch for a nuclear power plant containment vessel

This invention is a float level switch used to sense rise or drop in water level in a containment vessel of a nuclear power plant during a loss of coolant accident. The essential components of the device are a guide tube, a reed switch inside the guide tube, a float containing a magnetic portion that activates a reed switch, and metal-sheathed, ceramic-insulated conductors connecting the reed switch to a monitoring system outside the containment vessel. Special materials and special sealing techniques prevent failure of components and allow the float level switch to be connected to a monitoring system outside the containment vessel. 1 figures.
Inventors:
Issue Date:
OSTI Identifier:
5311553
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; EDB-94-051805
Patent Number(s):
US 5262604; A
Application Number:
PPN: US 7-681030
Contract Number:
AC12-76SN00052
Resource Relation:
Patent File Date: 5 Apr 1991
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; LEVEL INDICATORS; DESIGN; NUCLEAR POWER PLANTS; REACTOR MONITORING SYSTEMS; CONTAINMENT SYSTEMS; REACTOR INSTRUMENTATION; CONTAINMENT; ENGINEERED SAFETY SYSTEMS; MEASURING INSTRUMENTS; NUCLEAR FACILITIES; POWER PLANTS; THERMAL POWER PLANTS; 220400* - Nuclear Reactor Technology- Control Systems