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U.S. Nuclear Reactors

LaSalle County Unit 1

Seneca, Illinois
Local population: 23,350 (10-mile radius)


Boiling Water Reactor


Licensed to operate from 04/17/82-04/17/22



Safety Issues:

Elevated Spent Fuel Pool, Groundwater Leaks Reported, Year Plus Outages

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Related Links & Documents

09/18/2006   UCS documented the factors leading to the year-plus reactor outage that began in September 1996 in this case study for our Walking a Nuclear Tightrope report.  See details | Download the pdf (1.5 kb)

04/12/2006  UCS expressed concerns to NRC Region III that operators intentionally disabled emergency systems during February 2006 event for the wrong reasons, just as operators at Three Mile Island Unit 2 and Chernobyl Unit 4 had done to transform relatively minor events into nuclear disasters.  Download the pdf

02/21/2006   UCS explained an event in which the reactor was shut down and a Site Area Emergency declared, for only the third time in U.S. nuclear plant history.  Download the pdf

05/21/1996   Fission Stories #104 described how foam material being applied to seal cracks in the concrete inlet station inadvertently got into the water. The owner tried downplaying the significance by claiming that the material floated and therefore could not clog the pumps. Then the owner paid a $650,000 fine to the NRC for the excuse that didn’t float.

05/21/1985   Fission Stories #113 how a failed gasket disabled all the normal and backup pumps providing cooling water for the plant and its equipment.