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The Apollo 13 crew DID shut down the reactant valves when ordered to by mission control.

They were asked to shut down the Oxygen reactant valves to two of the three fuel cell in a vain effort to stop the venting of the oxygen into space.

The reason there was a slight reluctance for mission control to order the valve shutdown, is that once closed, these valves cannot be re-opened and the two fuel cellls would then become unusable.

Mission rules state that there must be at least two fully functioning fuel cells before a landing can be attempted. shutting down the two reactant valves effectively aborted the landing mission. However the true damage to the spacecraft was so severe that this was a moot point anyway, and the landing would have to have been aborted in any case.

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