The high radiation environment requires multiple redundancies and constant repair of circuits. Basic computing devices are possible, but require large components, multiple CPUS whos results are compared wit =hwith each other to see which answers are correct and which CPUs have been damaged and need repairing / replacing.
The environment refers to their home planet, the planets the colonize, and even their ships.
This also applies to their "biology" with "DNA" which redundant information encoding and very robust genetic repair mechanisms.