The following information was provided by the licensee via email:
The plant is in a safe condition.
On June 21, 2022, while performing a routine management observation, an employee noticed that only a single individual was performing the administrative actions required to implement both [items relied on for safety] IROFS 50b and IROFS 50c. These IROFS are independent, administrative IROFS that prevent heavy vehicles from damaging equipment that could result in a UF6 release. Both IROFS are required to meet the performance requirement of 10 CFR 70.61. Since only one individual was performing the administrative action, the independence of the IROFS was not being maintained and the performance requirement of 10 CFR 70.61 was not being met. At the time of the event, there were not any heavy vehicles that threatened damage to equipment.
[Urenco USA] (UUSA) is reporting this event per 10 CFR 70. Appendix A(b)(2).
All work that requires utilizing person(s) to control the proximity of vehicles to equipment that could release UF6 has been stopped. This issue has been entered in UUSA's corrective action program as EV 152996.
The licensee will notify the NRC Regional inspector.