Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Flux monitoring
Patent
1989-06-13
1991-05-14
Hunt, Brooks H.
Induced nuclear reactions: processes, systems, and elements
Testing, sensing, measuring, or detecting a fission reactor...
Flux monitoring
376255, 376247, G21C 1700
Patent
active
050154346
ABSTRACT:
In the core of a boiling water nuclear reactor, local power range monitor strings typically including four vertically spaced monitoring sites are modified. Each monitoring site includes a conventional local power range detector in which fissionable material exposed to thermal neutron radiation produces fission fragments, ionizes a gas and produces a current between the anode and cathode. In the improvement herein, each conventional local power range detector is provided with one or two adjacent gamma thermometers; each gamma thermometer including an interior mass to be heated by gamma radiation, a thermocouple for measuring the heated mass and a reference thermocouple connected in series. Both the conventional local power range detector and the gamma thermometer(s) are all geometrically arranged in a string with individual connecting cables leading to external connectors, one for each detector and gamma thermometer. When the sring is inserted into the core and the reactor operated at a steady state, the gamma thermometers can be utilized to calibrate the local power range detectors in conjunction with a convetional reactor heat balance. By the expedient of referencing the gamma flux to the output of the heat balance, calibration of the local power range monitors occurs over their useful in-service life.
REFERENCES:
patent: 3760183 (1973-09-01), Neissel
patent: 4440716 (1984-04-01), Smith
patent: 4774050 (1988-09-01), Impink, Jr.
patent: 4818471 (1989-04-01), Thomson
Dean Chu Edward M.
O'Neil Timothy J.
Ross Monty A.
Wimpee Lealon C.
Chelliah Meena
General Electric Company
Hunt Brooks H.
Schroeder Robert R.
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