A reactor operator (or nuclear reactor operator) is an individual at a nuclear power plant who is responsible for directly controlling a nuclear reactor from a control panel and is the only individual at a nuclear power plant who can directly alter significant amounts of reactor reactivity. The reactor operator occupies a position of great responsibility that may require him or her to start up a nuclear reactor, shut down a nuclear reactor, monitor reactor parameters, or respond to a casualty of the nuclear reactor. A reactor operator (or nuclear reactor operator) is an individual at a nuclear power plant who is responsible for directly controlling a nuclear reactor from a control panel and is the only individual at a nuclear power plant who can directly alter significant amounts of reactor reactivity. The reactor operator occupies a position of great responsibility that may require him or her to start up a nuclear reactor, shut down a nuclear reactor, monitor reactor parameters, or respond to a casualty of the nuclear reactor. All reactor operators are required to be licensed or qualified by their respective governing body (for example, the NRC for U.S. civilian nuclear reactors and Naval Reactors for U.S. naval reactors). There are two types of civilian reactor operators licensed by the NRC: reactor operators (RO) and senior reactor operators (SRO). A reactor operator is an individual who has met the licensing requirements of 10 CFR 55 and NUREG-1021 for being a reactor operator. These requirements include: A reactor operator is licensed to manipulate the controls of a nuclear reactor which may alter reactivity and change the power level. Typically, this means that a reactor operator is qualified to remotely operate control rods and other remote actions required to control the reactor as desired (within regulatory requirements).