This is a concurrent report of a 24-hour report that was made to the state of
Tennessee regarding a break in the main fire water loop due to construction activities. The fire loop is fed by city water. The fire water pipe break was isolated by closing isolation valves upstream of the break. A portion of the water and dirt from the excavation flowed into a nearby storm water drainage system. This drainage system has a storm gate which was closed prior to the event to contain the dirt and water. The dirt is still contained in the storm water system located within the protected area of
NFS. The dirt is currently being removed from the storm water system. The storm gate will remain closed until the dirt removal activity has been completed.
Potential health and safety consequences to the workers, the public and the environment: "There are no actual safety consequences to workers, the public, or the environment. The potential consequence was a slightly elevated but less than the 10 CFR 20 Table 2 limits of contaminated liquid effluent from a construction accident.
The licensee notified the NRC Resident Inspector.
Fire watches have been established for the areas affected by the fire loop break. No criticality controls were affected by this event.