In this May 7, 2013 photo released by Idaho National Laboratory, nuclear operations professional personnel work above the Advanced Test Reactor at Idaho National Laboratory’s desert site about 50 miles west of Idaho Falls, Idaho. The small cylindrical section in the center of the platform has access ports that allow access to the reactor core for refueling and experiment loading and unloading during routine outages. The platform, a layer of shield blocks totalling more than 150,000 lbs, and then the 62,000-lb reactor vessel top head are temporarily removed in order to complete the ATR core overhaul. CREDIT: Idaho National Laboratory via AP

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