Phase I measurements for the HTGR bottom reflector and Core Support Block Neutron-Streaming Experiment

Technical Report · Sun Jul 01 04:00:00 EDT 1984

DOI:https://doi.org/10.2172/6543957· OSTI ID:6543957

Muckenthaler, F. J.; Holland, L. B.; Hull, J. L.; Manning, J. J.

This report presents the Phase I measurements of the High-Temperature Gas-Cooled Reactor Bottom Reflector and Core Support Neutron Streaming Experiment conducted at the ORNL Tower Shielding Facility during FY-1983. In this phase the first four of eight segments that comprise the full experimental mockup were utilized. These were: (1) an upper boron pin layer (graphite matrix) followed by a boral shroud; (2) a graphite reflector layer; (3) a graphite coolant crossover layer; and (4) a graphite follow-on layer, all containing coolant holes. A collimated beam from the Tower Shielding Reactor II was used as the neutron source. In order to obtain a spectrum of neutrons more nearly like the spectrum expected from the HTGR, an iron and graphite spectrum modifier was inserted in the TSR-II beam ahead of the experimental mockup. The various experimental configurations tested resulted from the successive addition of the four graphite layers to the mockup. Neutron energy spectra were measured behind the spectrum modifier and the boron pin layer and integral neutron fluxes were measured behind the spectrum modifier and behind each of the four layers. The measurements were divided into two Parts, the two parts differing in the composition of the boron pin layer. During part I, a reference pin pattern was used which consisted of a combination of graphite and boronated graphite pins. During part II, a full pattern of boronated graphite pins was used. The experimental data are presented in both tabular and graphical form.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6543957
• Report Number(s): ORNL/TM-8977; ON: DE84016555
• Country of Publication: United States
• Language: English

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TSR-1 REACTOR