JCC-61/62: Universal Fast Breeder Reactor Subassembly Counters
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Features
- Authorized for routine inspection use as the Universal Fast Breeder Counter (UFBC).
- Designed for passive neutron measurement of plutonium in fast breeder reactor fuel subassemblies.
- Fast Amptek electronics.
- Twelve 3He detectors.
- Transportable.
Description
The JCC-61 and JCC-62 are based on a design developed at Los Alamos National Laboratories (LANL) for the United States Department of Energy. They have also been authorized for routine inspection use of nuclear material at facilities placed under international safeguards.
The JCC-61 and JCC-62 quantitatively measure fast breeder fuel sub-assemblies, individual fuel pins, or a group of fuel pins. They count coincidence neutrons from the spontaneous fission of the even numbered isotopes of plutonium. Subassemblies can be lowered through the top of the counter using a crane. If this is not possible, the door opens to allow side entry. For ease in moving, the door can be removed. A JSR-12 Neutron Coincidence Analyzer, a computer and analysis software are required for coincidence counting but are not included with the JCC-61 or JCC-62.
Twelve 3He tubes are surrounded by a polyethylene and cadmium sleeve in the central region to flatten the axial response and decrease counter die-away time. The cadmium stops 15 cm (5.9 in.) from the bottom and 17.5 cm (6.9 in.) from the top to compensate for end leakage. The counter is under-moderated to minimize weight and to maximize the amount of plutonium that can be measured. The cadmium liner inside the sample cavity prevents re-entry of thermal neutrons which could induce fission in the fuel and adversely affect the measurement.
The JCC-62 has an enlarged sample diameter to allow measurement of Super Phenix fuel subassemblies. To compensate for larger end effects, polyethylene collars were added to the ends of the counter.
The 3He tubes in the JCC-61 and JCC-62 are arranged in a single ring, and are divided into six groups of two. Each group is wired together and connected to one JAB-01 Amplifier/Discriminator circuit board. The six JAB-01s are mounted inside a high voltage junction box. LED indicator lights are placed externally to the junction box to indicate the proper operation of each JAB-01 channel. Electrical connections between the JCC-61 or JCC-62 and the JSR-12 include +5 V, HV, and a single "ORed" output signal.
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| Models | Description | |
| JCC-61 | Universal Fast Breeder Reactor Subassembly Counter | |
| JCC-62 | Universal Fast Breeder Reactor Subassembly Counter | |