Possible Clues:

• Self-sustaining sequence
• Continuing process
• Doctor or technician containing a process hard to stop
• Domino effect Daily Express leader describes in lawsuit
• Restrain tendency to oppose nuclear process?
• Row about engagement, one thing leading to another
• Falling-domino effect
• Sequence inevitably following flush?
• Self-maintaining process
• Work of nuclear scientist or a technician, possibly