IL Nuke Safety System Shuts Reactor

Monday, August 11, 2014 @ 07:08 PM gHale

Unit 2 at Exelon’s La Salle nuclear plant in Illinois tripped offline Tuesday when a safety system activated.

At 5:34 p.m., the reactor protection system shut the unit down automatically when main steam isolation valves closed, according to a report filed with the Nuclear Regulatory Commission (NRC).

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Part of the nuclear steam supply shutoff system caused the main steam isolation valves to close, although there was no leak reported.

Valves also isolated the reactor water cleanup system during the event, according to the NRC. The shutdown proceeded normally, and Exelon said in a release that it is investigating the cause of the closed main steam isolation valves.

Located 75 miles southwest of Chicago, La Salle uses two General Electric boiling water reactors completed in the mid-1980s to generate about 2,200 megawatts. Unit 2 is a GE type 5 BWR with Mark II containment. According to the NRC, the reactor remained offline.

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