There aren't many radioactive isotopes of Oxygen and Hydrogen and the ones that there are aren't very radioactive.

As dmckee notes, there is Deuterium formed from Hydrogen capturing a neutron, this produces D2O, or heavy water. But Deuterium is stable and so doesn't cause radioactivity in itself. Heavy water is chemically a little toxic but not a radiation risk. You could produce Tritium when Deuterium captures another neutron, but the rates of this happening at fuel rod energies/intensities is tiny.

The most likely source of fuel pond becoming dangerously radioactive is a crack in one of the fuel rods allowing isotopes generated in the fuel to leak out.

There aren't many radioactive isotopes of Oxygen and Hydrogen and the ones that there are aren't very radioactive.

As dmckee notes, there is Deuterium formed from Hydrogen capturing a neutron, this produces D$_2$O, or heavy water. But Deuterium is stable and so doesn't cause radioactivity in itself. Heavy water is chemically a little toxic but not a radiation risk. You could produce Tritium when Deuterium captures another neutron, but the rates of this happening at fuel rod energies/intensities is tiny.

The most likely source of fuel pond becoming dangerously radioactive is a crack in one of the fuel rods allowing isotopes generated in the fuel to leak out.

There aren't many radioactive isotopes of Oxygen and Hydrogen. Those that there are - aren't going to be created in any appreciable amounts by the relatively low levels of low energy neutrons given off by a fuel rod.

The most likely source of fuel pond becoming radioactive is a crack in one of the fuel rods allowing isotopes generated in the fuel to leak out.

There aren't many radioactive isotopes of Oxygen and Hydrogen and the ones that there are aren't very radioactive.

As dmckee notes, there is Deuterium formed from Hydrogen capturing a neutron, this produces D2O, or heavy water. But Deuterium is stable and so doesn't cause radioactivity in itself. Heavy water is chemically a little toxic but not a radiation risk. You could produce Tritium when Deuterium captures another neutron, but the rates of this happening at fuel rod energies/intensities is tiny.

The most likely source of fuel pond becoming dangerously radioactive is a crack in one of the fuel rods allowing isotopes generated in the fuel to leak out.