Root causes of NIST reactor alert point to operator training

October 6, 2021, 3:02PMNuclear News
A rendering of the core of the NBSR, which consists of 30 aluminum-cladded plate-type U3O8 fuel elements with a 17.8-cm gap between elements. (Image: NCNR Technical Working Group, Root Cause Investigation of February 2021 Fuel Failure) (CLICK IMAGE TO ENLARGE)

The National Institute of Standards and Technology (NIST) has submitted two reports and supplemental information to the Nuclear Regulatory Commission after conducting a root cause analysis of the February 2021 fuel failure and resultant alert at the NIST Center for Neutron Research (NCNR) in Gaithersburg, Md. While the 20-MWt NCNR research reactor remains shut down, scuttling the plans of researchers who rely on it as a source of both cold and thermal neutrons, NIST states in an October 4 update that it has requested permission to restart the reactor, contingent upon meeting all 18 corrective actions identified.