Actually procedure & working of department is better known by department person than any other person.
You can mention three Names with designation: 1. Prepared By: (eg. by you or department person)
2. Checked By: (eg. by you or department person)
3. Authorized By: (Respective Department Head).
The same is then presented to the safety committee for their approval or for discussion.
In some cases, the safety officer may discuss the report with the plant head and engineering head to understand the implications and to get another point of view. It depends on what the structure of the organisation is and who is responsible (finally, the occupier)
First of all the risk assessment should not be carried out alone by safety officer ideally. It should be a cross functional team or purely by the technical team in ideal situation.
This is ideal situation. In most of the India industries, this job doing by Safety Officer. This practise needs to change for get some result out of this risk assessment. If you preparing a 50 page document being a safety officer and present to your technical team, they will not feel the ownership about this document and therefore it will not get implement. So first of all try to change the entire practise itself, if possible to you.
Now who should approve. It may be your technical head, the technical department heads or any authorized person with skills authorized by the management. No firm rules for this existing anywhere. its industry to industry varies.
Hope this helps. Happy to discuss further, in case needs any clarifications.