U.S. Instrumentation Update

摘要

1. What were the challenges to the accuracy of the sensors within containment and in the fuel pool during Fukushima and TMI? The events at Fukushima have resulted in a heightened awareness in the nuclear industry about issues with existing instrumentation that cannot adequately inform plant operators of the reactor parameters in severe accident conditions. For example, determination of in-core coolant level and temperatures at TMI and Fukushima were challenging to plant operators due to lack of in-core level instrumentation, insufficiency of instrumentation in the blackout conditions (Fukushima), and faulty in-core temperature measurements in the severe conditions (TMI).