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Report No.
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JASPER Experimental data book (VIII); Flux monitor experiment

Takemura, Morio*

This report is intended to make it easier to apply the measured data obtained from the Flux Monitor Experiment, which was conducted at the Oak Ridge National Laboratory (ORNL) during about two months beginning at the start of May, 1992 as the seventh one of a series of eight experiments planned for the Japanese-American Shielding Program for Experimental Research (JASPER) which was started in 1986. For this reason, the information presented includes specifications and measurement data for all configurations, compositions of all materials, characteristics of the measurement system, and daily-basis records of measurements. The Flux Monitor Experiment was planned to examine the shielding concerns and neutron transport characteristics pertaining to the neutron instrumentation systems (NIS) designed to monitor neutron flux within the reactor vessel of an advanced fast reactor, for verification and improvement of the analysis method to be applied to the shielding design. A spectrum modifier and a mockup around NIS was placed, with or without a in-vessel fuel storage region, behind the TSR-II reactor of Tower Shielding Facility. Neutron flux was measured behind the configurations or in situ with various types of detectors. The integral neutron flux in wide energy region was measured with Bonner ball detectors on the axis and on radial traverse in almost all configurations. Fast neutron spectrum was further measured with spectrometors and also radial distribution of low energy neutron with fission chambers. Information presented in this report is based mainly on a report issued by ORNL (ORNL/TM-12171, "Measurements for the JASPER Program Flux Monitor Experiment"). Additional information reported by the assignee is utilized also.

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