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Unit 2 was shut down in early January 2012 for routine refueling and replacement of the reactor vessel head. [48] On January 31, 2012, Unit 3 suffered a radioactive leak largely inside the containment shell, with a release to the environment below allowable limits, and the reactor was shut down per standard procedure.
To replace the reactor vessel head, FirstEnergy purchased one from the mothballed Midland Nuclear Power Plant in Midland, Michigan. [ 26 ] The NRC determined that this incident was the fifth-most dangerous nuclear incident in the United States since 1979, [ 3 ] and imposed its largest fine ever—more than $5 million—against FirstEnergy for ...
In July 2002, an unused nuclear reactor vessel head from Unit 2 was removed from its containment building for transportation to Davis-Besse Nuclear Power Station near Oak Harbor, Ohio, where it replaced a damaged vessel head on a reactor. [9] Consumers owned a 49 percent share in MCV until 2006. Eight other companies owned the remaining 51 percent.
A reactor vessel head for a pressurized water reactor. This structure is attached to the top of the reactor vessel body. It contains penetrations to allow the control rod driving mechanism to attach to the control rods in the fuel assembly. The coolant level measurement probe also enters the vessel through the reactor vessel head.
A boiling water reactor (BWR) is a type of nuclear reactor used for the generation of electrical power. It is the second most common type of electricity-generating nuclear reactor after the pressurized water reactor (PWR).
As the extra xenon-135 is transmuted to xenon-136, which is much less a neutron poison, within a few hours the reactor experiences a "xenon burnoff (power) transient". Control rods must be further inserted to replace the neutron absorption of the lost xenon-135. Failure to properly follow such a procedure was a key step in the Chernobyl ...
The TR-2 nuclear reactor, also known as the Westinghouse Test Reactor or Westinghouse Testing Reactor (WTR) was a small research and test reactor designed and manufactured by Westinghouse Electric Corporation at their Waltz Mill site near Madison, Pennsylvania, approximately 30 miles southeast of Pittsburgh. TR-2 was the first privately owned ...
On December 21, 2009 the Unit 3 reactor tripped and shut down for longer than 72 hours. [28] On July 27, 2009, the Unit 2 reactor tripped and shut down for longer than 72 hours. On August 9, 2013, the Unit 3 reactor tripped and shut down due to a malfunction. In 2016, unit 3 was shut down following a hydrogen gas leak. [29]