The following information was provided by the licensee via phone and email:
At 1905 [EDT], a security force member discovered what appeared to be a sewage leak along the gravel roadway northwest of the gatehouse entrance. The affected area was approximately 12' X 15'. The water was slowly bubbling up from the ground about 20' along one of our access roads.
Large absorbent spill containment barriers were placed at the scene to minimize the incident. Water usage was stopped within our facility, and sewer pumps isolated. The Maine State Department of Environmental Protection (DEP) was notified of the incident (DEP spill # 23-0004705). The area was inspected at approximately 2130 [EDT], and water discharge was no longer observed.
Maine Yankee site management is currently in the process of contacting contractors to resolve the issue.
The site is safe and secure. The concrete cask heat removal system is operable, and the temperature monitoring system is functional.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
The licensee notified Region 1 personnel.