10 CFR 70.52 - Reports of accidental criticality.
(a) Each licensee shall notify the NRC Operations Center 1 within one hour after discovery of any case of accidental criticality.
1 Commercial telephone number of the NRC Operations Center is (301) 816-5100.
(b) This notification must be made to the NRC Operations Center via the Emergency Notification System if the licensee is party to that system. If the Emergency Notification System is inoperative or unavailable, the licensee shall make the required notification via commercial telephonic service or other dedicated telephonic system or any other method that will ensure that a report is received by the NRC Operations Center within one hour.