A new report by the Nuclear Regulatory Commission has revealed an electrical fire at an idled Nebraska nuclear plant posed a high safety risk because the fire knocked out pumps circulating water in a pool with spent nuclear fuel. The fire occurred last June at the Fort Calhoun Nuclear Station shortly after the reactors were idled due to massive flooding. The NRC said it classified the fire as a “red” event, representing the highest level of safety threat tracked by the agency. The report also criticized workers at the nuclear plant for ignoring an “acrid odor” at the plant that existed for three days before the fire began.