'A risk assessment is not about creating huge amounts of paperwork , but rather about identifying sensible measures to control the risks in your workplace.' - http://www.hse.gov.uk/risk/controlling-risks.htm
For your film production you need to produce risk assessments for the locations you intend to film in (your workplace), these should indicate any hazards that you may face and how you intend to control the risks you face. You need to produce documents that indicate the risks and how these will be managed. A template is here:
As with a recce report the Location manager is in charge of health and safety on a shoot http://creativeskillset.org/job_roles_and_stories/job_roles/2943_location_manager_film