What Is Pre-Startup Safety Review Under PSM?
The Pre-Startup Safety Review is a verification requirement that applies whenever a new process facility is commissioned or when modifications to an existing facility are significant enough to require a change in process safety information. The PSSR is the final safety gate before introducing highly hazardous chemicals into a new or modified process.
OSHA requires that the PSSR confirm four things: construction and equipment is in accordance with design specifications; safety, operating, maintenance, and emergency procedures are in place and are adequate; a PHA has been completed and recommendations resolved; training of each employee involved in operating a process has been completed.
The PSSR is not just a paperwork exercise — it is a physical walkdown and verification. Equipment must be inspected against P&IDs. Procedures must actually be written, current, and accessible. The PHA must be complete. And operators must be trained — not just scheduled for training.
What the Standard Actually Requires
- 1Scope Trigger — Required for all new processes and for modified processes where changes require PSI updates.
- 2Construction Verification — Physical verification that construction and equipment conform to design specifications.
- 3Procedure Readiness — Safety, operating, maintenance, and emergency procedures must be in place, complete, and accessible before startup.
- 4PHA Completion — A PHA must be completed and recommendations resolved before introduction of HHCs.
- 5Training Completion — Training of all employees involved in operating the process must be complete.
Common Violations OSHA Cites
These are the deficiencies inspectors most frequently document in Pre-Startup Safety Review programs. Each can represent a separate citation.
Frequently Cited Violations
- PSSR not performed for a modification that required changes to process safety information
- PSSR completed but PHA recommendations were still open at startup
- Operators started up new/modified process without completed training documented
- PSSR was a paper review only — no physical walkdown to verify equipment against P&IDs
- No documentation that PSSR was performed
What Inspectors Look For
- Requesting PSSR records for the last 2-3 major projects or modifications at the facility
- Cross-referencing PSSR date against training completion dates for affected operators
- Reviewing open PHA recommendations at the time of PSSR to check for premature startup
- Comparing PSSR checklist scope against the full MOC scope to identify gaps
Consequences of Pre-Startup Safety Review Failures
Premature startup — introduction of HHCs before all PSSR requirements are satisfied — is a known high-risk scenario. The 2005 BP Texas City disaster involved startup of a process where procedures were inadequate and operators were not properly trained, conditions that a thorough PSSR would have identified and prevented.
Penalty Exposure — Pre-Startup Safety Review
2026 OSHA penalties: up to $16,550 per serious violation and up to $165,514 per willful or repeat violation (willful minimum $11,823). In OSHA's Chemical National Emphasis Program, Pre-Startup Safety Review accounted for 1.1% of PSM citations, ranking #12 of the 14 elements (OSHA, 2012).
Documents Your PSSR Program Needs
An OSHA compliance inspection for Pre-Startup Safety Review will typically request the following. Gaps in any of these areas may result in citations.
Required Documentation
- PSSR checklist and completed PSSR records for each new/modified process
- PSSR team qualification records
- Cross-reference of PSSR against current P&IDs
- Open PHA recommendation status at time of PSSR
- Operator training completion records pre-dating PSSR clearance
Related LOI Guidance
OSHA has clarified these specific questions about the Pre-Startup Safety Review element through official Letters of Interpretation:
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