PSR or PHSR is an acronym for the term Pre-Start Health and Safety Review. This phrase is the title for Section 7 of Regulation 851 of Industrial Regulations, a section of the Occupational Health and Safety Act.As per its name, the purpose is to provide a health and safety review prior to start up (Pre-Start) of the equipment/system or operation. The regulation goes on to say that this review pertains to a factory, other than a logging operation and should a provision of the regulation apply and