Here’s the Monday morning wrapup, compiled from reports submitted to the Nuclear Regulatory Commission:
1. On Friday morning, control room personnel at the Nine Mile Point nuclear power plant in New York “received alert alarms for containment monitoring particulate channels (for the Unit 2 reactor.) These alarms were accompanied by a rise in drywell floor drain leakage and drywell pressure.”
Unit 2 entered a Technical Specification shutdown due to the leakage and pressure increase. The leak rate began to subside as the reactor ramped down. The reactor is now at 0 per cent output as of this morning’s Reactor Status Report.
2. Last Thursday, the Robinson nuclear power plant in South Carolina sent the NRC a followup to an incident earlier in the week. In the earlier event, Robinson discovered that a radiation monitor in the plant’s sole reactor was not properly set, a condition which plant operators determined had existed for at least three years. The update reported that two additional radiation monitors were not properly set.
3. On Saturday, the Columbia nuclear power plant in Washington reported that its sole power reactor lost secondary containment as a result of a result of icing of the reactor building intake filters which caused the automatic reactor building pressure control system to function improperly.” Secondary containment has now been restored.
4. And on Sunday, operators of the Salem nuclear power plant in New Jersey reported to the NRC that trip points for two radiation monitors were incorrectly set during recovery from a refueling outage on November 24. A Technical Specification limiting condition was declared, and the trip points for the two monitors were reset.