This is for the whole of part II, which includes all occupational health and safety, so the terminology “accident” is absolutely appropriate.
In terms of adding a reference to including “harassment or violence”, why include just “harassment and violence” and not some of the other incidents, accidents, whatever they might be, that are related to occupational health and safety?
That would be my caution there with including “harassment or violence”, because this part deals with things that are much broader than just harassment or violence.