Changes in the coolant oxidation potential in the loop of the TsU-1M facility during the ejection of hydrogen into the loop: 1 – ∆GPb (СО = 6×10–7 % wt); 2 – ∆GPb (СО = 3×10–7 % wt); 3 – ∆GPb (СО = 5×10–8 % wt); 4 – ∆G0 (Fe3O4).