Sadly its not the first time that an Exelon plant in the state of Illinois has had a problem concerning radioactive Tritium leaks. Their nuclear plant in Braidwood (south of Joliet) supposedly suffered leaks of Tritium from its transfer pipes and dumped the radioactive material in the Kankakee River in 1996, 1998, and 2000. As of 2012 there is still debate as to if any health risks exist seeing as how the level of Tritium is still below the acceptable levels of 20,000 picoCuries per liter.