Measurements for the JASPER Program Axial Shield Re-measurement Experiment

Technical Report · Mon Mar 01 04:00:00 EST 1993

DOI:https://doi.org/10.2172/432822· OSTI ID:432822

Muckenthaler, F J; Spencer, R R; Hunter, H T; Hull, J L ^[1]; Shono, A ^[2]

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1. Oak Ridge National Lab., TN (United States)
2. Power Reactor and Nuclear Fuel Development Corp., Oarai, Ibaraki (Japan). Oarai Engineering Center

With one modification, this series of measurements is a repeat of several of the mockups that were investigated during the Axial Shield Experiment performed earlier for the Japanese-American Shielding Program for Experimental Research (JASPER) program at the Tower Shielding Facility (TSF). For these re-runs, slabs of lithiated paraffin, 10.16 cm thick and 152.4 cm on an edge, were placed between the spectrum modifier and the axial shield and directly behind the axial shield. Each of the slabs contained a void area that corresponded in dimension and location,to the surface area of the seven hexagons in the axial shield plus the boron carbide (B{sub 4}C) collar that surrounded them. The lithiated paraffin was made part of the mockup to reduce the neutron contributions to the detector from those neutrons passing through the concrete surrounding the hexagon assemblies. The slabs were present in all of the mockups except one, for which the lithiated paraffin following the axial shield was removed. Spectral and integral flux measurements were made behind the axial shield for six B{sub 4}C homogeneous-type assembly containing: (1) the B{sub 4}C rod bundle assembly; (2) the B{sub 4}C central blockage type; (4) the B{sub 4}C central sodium type; and (4) another B{sub 4}C homogeneous-type assembly. The neutron source was the Tower Shielding Reactor II (TSR-II) modified to give a flux typical of that incident on the axial shielding in a Liquid Metal Reactor (LMR).

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 432822
• Report Number(s): ORNL/TM--12276; ON: DE97003411
• Country of Publication: United States
• Language: English

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