On April 14, 2023, the NRC issued a notice of violation (Notice) to the U.S. Environmental Protection Agency (licensee) for two violations. The first violation (Severity Level III) involved the licensee’s failure to control and maintain constant surveillance of licensed materials that were not in storage as required by 10 CFR 20.1802. The second violation (Severity Level IV) involved the licensee’s failure to correctly perform physical inventories of licensed materials as required by License Condition 18 of NRC Materials License No. 27-05861-02.