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I have no experience in nuclear but have worked on infrastructure projects that have restarted. I think people have a new set of biases that are not present in the first project. They are optimistic which is a risky state of mind.

Also...

* Often the starting point is a poorly organized mess that needs to be unpicked and understood.

* People conduct "reviews" of existing work that consumes budget and leads to new issues being found.

* You are continuing an existing chain of communication, but with a loss of continuity. The people you need to ask can't remember, or are not available to ask.

* Overly optimistic budgets lead to corner cutting and mistakes.