Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Cranes that lift nuclear fuel have been halted twice amid a series of safety alerts during a £200m refit of a Royal Navy Trident submarine , it has emerged.

Devonport safety probes stop cranes at nuclear submarine dock