Recently the Neutron Radiography (NRAD) reactor had an automatic shutdown (SCRAM) during a Reactor Operator (RO) final certification practical examination. The RO under instruction was executing a manual power change from 50 watts (w) to a desired operating power of 250 kilowatts (kw). At a power of 209 kw the RO under instruction performed a shim of the regulating rod that was too long in duration which increased power past the desired 250 kw. The entire event lasted approximately 3 seconds, therefore the RO over watch did not have time to intervene and reduce power. The reactor SCRAM occurred on 110% power (276 kw). The author of the article uses a car driving analogy to explain the event for those unfamiliar with reactor operations terminology.
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