Thermal column experimental facilities

2 Thermal Column.Bsperimemtsl Pnclllties. The thermal-column experimental facilities include one large horizontal hole and 10 small holes, as follows  

To D tank To y-ray screen 90° column accessible on north or south face of reactor 

In some respects the HG-9 hole should not be considered as part of the thermal column since it provides access to the fast-neutron flux directly from the active lattice through sealed empty cans in the beryllium. However, with 

The holes normal to the direction of the thermal column are expected to be extremely useful in providing very pure fields of thermal neutrons although at somewhat reduced intensity. 

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Two important experimental facilities, the thermal column and the shielding facility (see Sections 3.1 and, 3.2j, require that a section approximately 6 by 6 ft be removed from.the east and west thermal-shield side plates. Two components are added to the thermal-shield design by.these facilities (1) the neutron window, and (2) the neutron-absorbing curtain. The locations of these components may be visualized by referring to Figs. 2.B and C. When the 6- by 6-ft hole is cut in the thermal shield, it becomes necessary to replace... 

Attention should be paid to proper cooling of experimental facilities and reactor structures such as thermal columns and concrete shields, as well as to electrical and instrumentation cables which may be located in unventilated hot areas. A temperature above 60 C may cause degradation of concrete by dehydration with a corresponding loss of integrity and neutron shielding effectiveness. 

A. 1102. This section shall provide a description of the design basis and of the design, as well as a safety analysis for all experimental facilities associated directly or indirectly with the reactor. Such facilities may include the beam tubes, the thermal column, in-core or moderator facilities, boreholes, experimental loops, etc. 

Experimental facilities None 1 thermal column 2 thermal columns ( glory hole and tangential hole) 1 thermal column 12 exposure ports... 

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