Originally Posted by
catandmouse
As an engineer I am somewhat surprised as I don't see what in the pump could be sensitive enough to be affected. My suspicion is that the manufacturers of the pumps have simply not tested or qualified the pumps under these conditions and are CYA themselves just in case.
The chips used probably aren't radiation-hardened. The odds of trouble are low but not zero. The exposure rate might matter--two hits on the same memory cell in rapid succession would be more likely to cause trouble than two hits spread apart. It's probably more a liability issue, though.