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National Criticality Experiments Research Center

NCERC is our nation’s only general-purpose critical experiments facility and is one of only a few that remain operational throughout the world

Located at the Nevada National Security Site (NNSS) and operated by the Los Alamos National Laboratory, the National Criticality Experiments Research Center (NCERC) provides a capability for conducting experiments using fissionable material. Experiments conducted at NCERC support many objectives, including training, R&D, and fundamental science. NCERC is our nation’s only general-purpose critical experiments facility and is one of only a few that remain operational throughout the world.

The mission of NCERC is to conduct experiments and training with critical assemblies and fissionable material at or near criticality in order to explore reactivity phenomena, and to operate the assemblies in the regions from subcritical through delayed critical. One critical assembly, Godiva-IV, is designed to operate above prompt critical.

NCERC has the equipment and expertise to conduct experiments on fissionable material at or near critical. This equipment includes 4 critical experiment machines. The capability was formerly housed at the Los Alamos Critical Experiments Facility.

Recent News

  • LANL researchers complete HALEU criticality experiment

    LANL researchers complete HALEU criticality experiment

    The Deimos experiment at Los Alamos National Laboratory is the first criticality experiment using high assay low-enriched uranium fuel to be carried out in the USA in more than 20 years, and will help to develop public data and criticality benchmarks for the material.

    Read Nowabout the article: LANL researchers complete HALEU criticality experiment
  • LANL researchers test HALEU transportation

    LANL researchers test HALEU transportation

    Los Alamos National Laboratory (LANL) has completed a series of first-of-a-kind criticality experiments intended to provide data to support the transportation of high-assay, low-enriched uranium (HALEU)-based fuel.

    Read Nowabout the article: LANL researchers test HALEU transportation
  • Valar Atomics project achieves early criticality milestone

    Valar Atomics project achieves early criticality milestone

    The company said its NOVA Core achieved zero-power criticality at LANL's National Criticality Experiments Research Center on 17 November.

    Read Nowabout the article: Valar Atomics project achieves early criticality milestone

  • Comet is a general purpose, vertical-lift critical assembly. It is used to conduct large size critical experiments. A nearly infinite variety of experiments can be conducted using Comet.

    • Read the 10 Year Paper

  • Planet is a general-purpose, vertical-lift critical assembly. With fissionable material, reflectors and interstitial materials loaded on a stationary platform and a moveable platen, Planet can be used to support a nearly infinite variety of experiments.

    • Read the 10 Year Paper

  • Flat-top is a spherical benchmark critical assembly. It is used for sample irradiations and for demonstrating criticality concepts.

    • Read the 10 Year Paper

  • Godiva IV is a burst assembly. NCERC has the ability to operate this assembly in the prompt critical regime. This assembly is used for sample irradiations, and to demonstrate criticality concepts.

    • Read the 10 Year Paper

  • Radiation test objects (RTOs) are subcritical configurations of nuclear material constructed by hand for the purposes of training, radiation measurements, providing information for the criticality safety community. The configurations vary in material type, mass, form, and geometry, resulting in a wide range of subcritical neutron multiplications (from near 1 to about 20).

    • Read the 10 Year Paper

Resources

  • Nuclear Criticality Safety Program
  • Visitor Information
  • NCERC 10 Year Papers
  • LACEF End of an Era Paper
  • NCERC Advanced Reactors Paper
  • NCERC Accomplishments Book 2019
  • NCERC Accomplishments Book 2020
  • NCERC Accomplishments Book 2021
  • NCERC Accomplishments Book 2022
  • ICSBEP