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If I recall correctly, the standard plating lessens the blast, should the thing explode. The heat capacity raises the maximum heat the reactor can take without exploding (useful for breeders).
From the IC2-Wiki: Reactor Plating
This component will increase your reactors maximum temperature by 1000 and will reduce the reactor's explosion range by 5%. Containment Reactor Plating
This component will increase your reactors maximum temperature by 500 and will reduce the reactor's explosion range by 10%. Heat-Capacity Reactor Plating
This component will increase your reactor's maximum temperature by 1700 but will only decrease the explosive range by 1%
From the IC2-Wiki: Reactor Plating
This component will increase your reactors maximum temperature by 1000 and will reduce the reactor's explosion range by 5%. Containment Reactor Plating
This component will increase your reactors maximum temperature by 500 and will reduce the reactor's explosion range by 10%. Heat-Capacity Reactor Plating
This component will increase your reactor's maximum temperature by 1700 but will only decrease the explosive range by 1%
I don't even know, if that reduction is additive or multiplicative. Additive would suggest 10 for 0%. Multiplicative would give us a rest range of 0.9^10 ~= 35%.