Gingezel 4: Hacker by Judi Suni Hall, PhD. and Donald S. Hall, PhD.

You grasp at straws when they are all you have to grasp at. Mechanical causes for the reactor accident on the remote mining planet Drezvir are being eliminated leaving Dreen and Mitra up for manslaughter charges for negligent design. Could the reactor control system have been hacked? The man who could have done it is on Drevzir. Suspicion is not proof and time is running out. Sci fi by scientists.