OMAHA, Neb. (AP) — Federal regulators have approved a small change in a Fort Calhoun’s flood preparations and they plan to re-examine the worst-case scenario for flooding at the Nebraska nuclear plant.

The Nuclear Regulatory Commission license change issued Wednesday should ensure Fort Calhoun shuts down quickly enough to be protected in a flood. NRC spokeswoman Lara Uselding said the change reflects an issue identified before the 2011 Missouri River flooding and it will make the nuclear plant’s flood plan more conservative.