N2023

Neutron Coincidence Collars

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The ANTECH Neutron Coincidence Collars (NCC) are used by safeguards inspectors to verify the fissile material content of fresh nuclear fuel assemblies

ANTECH Neutron Coincidence Collars include:

            1. The N2023-M, designed for BWR fuel assemblies,
            2. The N2044, designed for PWR and smaller fuel assemblies,
            3. The N2071, designed for PWR and smaller fuel assemblies,

    Benefits

  • 23 highly moderated ³He neutron detectors to maximise efficiency
  • 1 holder is provided for americium/lithium source for active measurements; source holder assembly is easily removable
  • Non-interchangeable connector types prevent misconnection
  • Instrument can be used with an ANTECH model N2000 UNC, or an ANTECH Model N2000-2 Unattended Monitor or JSR-15 Neutron Coincidence Counter with INCC-32 Software
  • Mobile cart provides mounting platform and folds flat for transportation
  • Spares and tool kit available

    Features

  • Chamber can be configured for the passive measurement of plutonium content in MOX fuel assemblies and active measurement of Boiling Water Reactor (BWR) fuel assemblies
  • 3 detector panels and one moderator panel housing the interrogation source
  • 1 set of easily removable cadmium moderator panels, 0.50 mm (0.019 in) thickness. They are also available in the following configurations, 0.30 mm (0.011 in), and 0.35 mm (0.013 in) thicknesses
  • Junction box providing a high voltage (HV) connection to ³He detectors and low voltage (LV) and signal connections to Amptek A111 amplifiers. The door panel has two A111 amplifier units, and each side has one A111 amplifier
  • Junction boxes/amplifiers are “daisy chained” together to provide a single signal output to ANTECH Model N2000 Universal Neutron Counter (UNC), ANTECH Model N2000-2 Unattended Monitor or JSR-15.
  • 1 TTL output channel (SIGNAL) when used in 'OR' counting mode
  • Hinged door to facilitate quick loading

  • Description

    The ANTECH N2023-M and N2044 are high efficiency neutron detectors used for verifying all types of un-irradiated light-water reactor fuel and fuel assemblies, notably LEU fuel, Mixed Oxide (MOX) fuel, fuels containing burnable poisons such as gadolinium and other contemporary fuel and fuel assembly types. The N2023-M is used in Boiling Water Reactor (BWR) nuclear fuel assemblies, the N2044 is used in both Pressurised Water Reactors (PWR) and BWR fuel assemblies.

    The N2023-M is similar in specification to the N2044. Both units employ the classic ‘collar’ geometry and are designed for non-active measurements. They are supplied with the following components: coincidence collar assembly, cadmium curtains, interrogation source holders, interconnection cables, cart and transportation cases.

  • Specifications
    Dimensions
    510 mm x 410 mm x 355 mm
    (including connectors)     Outer dimensions (H x W x D)
    BWR fuel assemblies
    165 mm x 165 mm 6.5 in x 6.5 in
    Weight
    37.5 kg (with 0.5 mm cadmium curtains fitted) Maximum weight (excluding trolley)
    Trolley Weight
    15 kg
    Low Voltage
    5V DC ± 10% Power to Junction Boxes/Amplifiers
    Input Power
    LV -5VA Maximum Power
    Maximum High Voltage
    HV - 1.8 kV
    Detection Efficiency
    With Cd = 17%

    Without Cd = 19.5%
    Die Away Time
    With Cd = 40 μs

    Without Cd = 45 μs
    Output Pulse Width
    50 ns ± 5 ns nanoseconds
    Sensitivity
    5 x 10⁴ electrons (nominal)
    Period between consecutive pulses
    500 ns nanoseconds
    Junction Box IP Rating
    IP65 Ingress Protection
    Temperature Range
    Operation = 5°C - 40°C, 20% to 95% RH

    Storage = 0°C - 60°C, 20% to 95% RH     RH = Relative Humidity
    EMC
    Complies with 2004/108/EC
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Founded in 1987, ANTECH is an independent provider of custom equipment, measurement services and technical expertise to the nuclear industry.

Our experience is a result of more than thirty years of academic research into nuclear measurement technologies and more than twenty years of continual product development. ANTECH radioactivity measurement instruments have applications in nuclear safeguards, nuclear waste assay and sentencing, and radiation detection. We have particular expertise in the development and supply of radiometric calorimeters for the measurement of plutonium, tritium and other heat producing radionuclides. Our broad international customer base includes government nuclear laboratories, power stations and nuclear industry side operators and contractors around the world.

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