Doesn't seem to be an issue here jc_7.......
"The energy required to heat, melt and boil the lunar ice to 1 Celsius is about 3 Megajoules of heat per kilogram of ice. This is a purely thermal process at 1 Celsius temperature. The reject heat from a nuclear electric generator such as an SP-100 service reactor can deliver this. For example, a 100 kilowatt electric generator would produce about 1 megawatt of waste thermal heat. This amount of heat would melt about 6,900 tons of water per year (1 Megawatt of thermal power, 5 days a week, 48 weeks per year). The Baseline NSR would deliver about 1123 tons to lunar escape orbit with this much water.
This suggests that the melting of ice is a relatively small issue. "
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