Today’s NRC Event Reports page contained three interesting items today:
1. The Quad Cities nuclear power plant in Illinois reported a drain line leak in its Unit 2 reactor, rendering the unit’s High Pressure Coolant Injection system inoperable. Not to worry, Quad Cities says, there’s a backup: The Reactor Core Isolation Cooling system is available. Sort of like your skydiving instructor telling you not to worry about the holes in your chute, because you’ve got a backup available. Happy landings!
2. Another drain line problem: Pennsylvania’s Three Mile Island reported that technicians have indentified a defective weld on the inside of a drain line. Fanboys suspect that Hugh Jackman may be involved….
3. On Tuesday, I told you that the South Texas Project had reported a potential fire safety issue in one of its reactors due to an improperly fused connection. The deficiency was discovered during a review of something called ‘industry operating experience.’ Today, the Palisades nuclear power plant in Michigan reported a similar problem during the same type of review. Palisades reported:
In the postulated event, a fire could cause one of the ammeter wires to short to ground. Simultaneously, it is postulated that the fire causes another DC wire from the opposite polarity on the same battery to also short to ground. This could cause a ground loop through the unprotected ammeter wiring. This event could result in excessive current flow (i.e., heating) in the ammeter wiring to the point of causing a secondary fire in the raceway system. The secondary fire could adversely affect safe shutdown equipment and potentially cause the loss of the ability to conduct a safe shutdown….
Stay tuned for more problems in other plants caused by the review of industry operating experience….