HIGH-TEMPERATURE MATERIALS AND REACTOR COMPONENT DEVELOPMENT PROGRAMS. VOLUME III. INSTRUMENTATION AND CONTROLS. Third Annual Report

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The development of instruments for controlling reactor operation is reported. A shim-scram actuator was designed incorporating an electromagnetic dnlve for shim and scram, a shim speed limiting device, and a force feedback position indicator. A three-channel trip circuit and a two-out-of-three logic circuit using controlled switches in place of transistors was designed, built, and tested. A capacitance-type temperature sensor was operated in an inert atmosphere at temperatures up to 3782 deg F. Models of a gridded and a compensated a-c ionization chamber were tested in both thermal neutron and gamma environments. The compensated a-c ionization chamber demonstrated better than 98% ... continued below

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Pages: 43

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Creator: Unknown. February 28, 1964.

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Description

The development of instruments for controlling reactor operation is reported. A shim-scram actuator was designed incorporating an electromagnetic dnlve for shim and scram, a shim speed limiting device, and a force feedback position indicator. A three-channel trip circuit and a two-out-of-three logic circuit using controlled switches in place of transistors was designed, built, and tested. A capacitance-type temperature sensor was operated in an inert atmosphere at temperatures up to 3782 deg F. Models of a gridded and a compensated a-c ionization chamber were tested in both thermal neutron and gamma environments. The compensated a-c ionization chamber demonstrated better than 98% gamma compensation at a thermalneutron flux of 5 x 10/sup -11/ nv and 1 Mw reactor power. Unpowered charged-fragment neutron detectors using boron-10 or uranium-235 as the emitter coating were demonstrated to respond linearly to changes of thermalneutron flux. Potentials, developed within the detecting circuit, possibly due to contact potentials, are suspected to be the cause of detector output-current instability as a function of time. Fission counter operation at 816 deg C was demonstrated to be feasible, but operation was not entirely satisfactory. Adequate reactor power range neutron sensing to 535 deg C is feasible using uncompensated d-c ionization chambers. (N.W.R.)

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Pages: 43

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  • Other Information: Orig. Receipt Date: 31-DEC-64

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  • Report No.: GEMP-270C
  • Grant Number: AT(40-1)-2847
  • DOI: 10.2172/4077219 | External Link
  • Office of Scientific & Technical Information Report Number: 4077219
  • Archival Resource Key: ark:/67531/metadc871005

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 28, 1964

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  • Sept. 16, 2016, 12:32 a.m.

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  • Sept. 22, 2016, 4:56 p.m.

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HIGH-TEMPERATURE MATERIALS AND REACTOR COMPONENT DEVELOPMENT PROGRAMS. VOLUME III. INSTRUMENTATION AND CONTROLS. Third Annual Report, report, February 28, 1964; United States. (digital.library.unt.edu/ark:/67531/metadc871005/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.