Pre-Startup Safety Review (PSSR) JHA (Job Hazard Analysis / Activity Hazard Analysis)
Updated 2026-06-23
A Pre-Startup Safety Review (PSSR) JHA (Job Hazard Analysis / Activity Hazard Analysis) is the plan that keeps the PSSR team safe verifying systems before startup, safe walking near-live systems, and rigorous in the review that confirms the plant is safe to start. A pre-startup safety review confirms a system is safe to start up — combining the pre-startup system-verification hazard, the walkthrough-of-near-live-systems hazard, and the review-completeness and safety-readiness hazard. This guide walks through building a Pre-Startup Safety Review (PSSR) JHA that names the pre-startup-system-verification, walkthrough-of-near-live-systems, and review-completeness/safety-readiness hazards and assigns the verification, walkthrough, and readiness controls that hold up in the field.
Why pre-startup safety review needs its own JHA
A pre-startup safety review (PSSR) is the formal, structured review conducted before a new or modified system is started up — verifying that construction/installation is complete and correct, that safety systems are in place and functional, that procedures and training are ready, and that the system is safe to start. The defining features are that it is a verification activity conducted on systems that are near-live (about to be started) and that the completeness of the review is itself a safety function (the PSSR is the gate that confirms safe startup). The hazards combine the pre-startup system-verification (the PSSR verifies systems that are complete and near-startup — the team examines systems that may be energized, pressurized, or ready to start, so the proximity to near-live systems during verification), the walkthrough-of-near-live-systems (the PSSR includes walking through and examining the systems — the walking/access hazards, plus proximity to systems that are energized/pressurized or about to be started), the review-completeness and safety-readiness (the PSSR is the safety gate before startup — an incomplete or inadequate review (missing a safety-system deficiency, an incomplete item, an unaddressed hazard) can allow an unsafe startup, so the review thoroughness is itself a critical safety function), and the coordination. The walkthrough-of-near-live-systems and the review-completeness/safety-readiness justify a dedicated JHA.
Breaking pre-startup safety review into steps
The steps for a Pre-Startup Safety Review (PSSR) JHA follow the review:
- Plan the PSSR, team, and system status
- Brief the team on the near-live system hazards
- Walk through and examine the systems (safe access)
- Verify construction/installation complete and correct
- Verify safety systems in place and functional
- Verify procedures and training ready
- Confirm the system is safe to start (or identify gaps)
- Document the PSSR
Each step carries a hazard, and the pre-startup system-verification, the walkthrough-of-near-live-systems, and the review-completeness/safety-readiness are where the most significant risks concentrate.
The hazards step by step
Pre-startup system-verification
The PSSR verifies systems that are complete and near-startup — the team examines systems that may be energized, pressurized, or ready to start, so the proximity to near-live systems during verification. The controls are establishing the system status (what is live/energized/pressurized), safe verification practices (not contacting live systems, maintaining safe distance), coordination with the system status, and the verification controls. The pre-startup system-verification is a defining hazard. (These follow the energized-systems fundamentals.)
Walkthrough-of-near-live-systems
The PSSR includes walking through and examining the systems — the walking/access hazards, plus proximity to systems that are energized/pressurized or about to be started. The controls are managing the walkthrough (safe access, slip/trip, fall protection for at-height examination), awareness of near-live systems during the walkthrough, maintaining safe distance from live/near-live systems, and the walkthrough controls. The walkthrough-of-near-live-systems is a defining hazard. (These follow the walking-working-surface fundamentals.)
Review-completeness and safety-readiness
The PSSR is the safety gate before startup — an incomplete or inadequate review (missing a safety-system deficiency, an incomplete item, an unaddressed hazard) can allow an unsafe startup, so the review thoroughness is itself a critical safety function. The controls are conducting the PSSR thoroughly per the checklist/procedure (verifying construction complete, safety systems functional, procedures/training ready), rigor in confirming safety-critical items, not signing off until deficiencies are addressed, and the review-completeness controls. The review-completeness/safety-readiness is a defining critical safety function — the PSSR gates safe startup. (These follow the safety-review fundamentals.)
Coordination
The coordination (of the PSSR team and with the system/startup) carries the coordination hazard. The controls are coordinating the PSSR, clear communication, and the coordination controls. (These follow the coordination fundamentals.)
A simple Pre-Startup Safety Review (PSSR) JHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Plan | System status | Plan PSSR, team, system status | project |
| Brief team | Near-live systems | Brief team on near-live system hazards | OSHA 1926.21 |
| Walk/examine | Slip / fall / live | Safe access, awareness of near-live systems, safe distance | OSHA 1926.501 |
| Verify complete | Readiness | Verify construction complete, safety systems functional | project |
| Confirm safe to start | Unsafe startup | Thorough review, don't sign off until deficiencies addressed | OSHA 1910.119 |
| Document | Review | Document the PSSR | project |
Near-live-systems safety and review completeness
A Pre-Startup Safety Review (PSSR) JHA centers on near-live-systems safety and review completeness. The near-live-systems safety addresses the verification and walkthrough of systems that are near-startup — controlled by establishing the system status (what is live/energized/pressurized), safe verification and walkthrough practices (not contacting live systems, maintaining safe distance, fall protection for at-height examination), and awareness of near-live systems. The review completeness addresses the PSSR's function as the safety gate before startup — controlled by conducting the PSSR thoroughly per the checklist (verifying construction complete, safety systems functional, procedures/training ready), rigor for safety-critical items, and not signing off until deficiencies are addressed, since an inadequate review can allow an unsafe startup. And the team gets coordination controls. A JHA built on near-live-systems safety and review completeness, with coordination controls, addresses the hazards that define a pre-startup safety review.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, a pre-startup safety review is the formal safety gate before a system is started, so it has a dual character: it is a physical activity (a team examining near-live systems) and it is itself a safety function (the review that confirms safe startup). The walkthrough-of-near-live-systems is the physical hazard — the PSSR team walks through and examines systems that are complete and near-startup, which means the systems may be energized, pressurized, or about to be started. So the team faces the walking and access hazards (slip/trip, at-height examination, congested areas) plus proximity to near-live systems, controlled by establishing the system status (what is live), managing the walkthrough safely (safe access, fall protection for at-height examination), awareness of near-live systems, and maintaining safe distance. Examining systems that are about to become live requires knowing their status and keeping clear.
The review-completeness and safety-readiness is the defining function that makes a PSSR more than an inspection. On the projects I have run, the PSSR is the last safety gate before startup — it verifies that construction and installation are complete and correct, that safety systems are in place and functional, that procedures and training are ready, and that the system is safe to start. So the completeness of the review is itself a critical safety function: an incomplete or inadequate PSSR that misses a safety-system deficiency, an incomplete item, or an unaddressed hazard can allow an unsafe startup, which is exactly the scenario PSSRs exist to prevent (and why they are required by process-safety-management regulations for covered processes). So conducting the PSSR thoroughly per the checklist and procedure, rigor in confirming safety-critical items, and — critically — not signing off the PSSR until deficiencies are addressed are the controls. The PSSR's value is entirely in its thoroughness; a rushed PSSR that rubber-stamps an unsafe system defeats its purpose. The coordination rounds it out. The JHA built on near-live-systems safety and review completeness is the one that protects the PSSR team and everyone present at startup.
The bottom line
A Pre-Startup Safety Review (PSSR) JHA names the pre-startup-system-verification, the walkthrough-of-near-live-systems, and the review-completeness/safety-readiness hazards with specific controls — establishing system status and keeping safe distance during verification, safe walkthrough with fall protection for at-height examination, and conducting the review thoroughly without signing off until deficiencies are addressed (the PSSR gates safe startup). The near-live systems and the review completeness are the defining concerns. The JHA that manages both is the one that protects the team and everyone at startup.
Frequently asked questions
Why is the completeness of the PSSR itself a safety function?
The PSSR is the last safety gate before startup — it verifies construction is complete, safety systems are functional, and procedures/training are ready — so an incomplete or inadequate review that misses a safety-system deficiency, an incomplete item, or an unaddressed hazard can allow an unsafe startup, exactly what PSSRs exist to prevent. Controls are conducting the PSSR thoroughly per the checklist/procedure, rigor in confirming safety-critical items, not signing off until deficiencies are addressed, and the review-completeness controls — the PSSR's value being entirely in its thoroughness.
What near-live-systems hazards apply?
The PSSR team examines systems that are complete and near-startup, so the systems may be energized, pressurized, or about to be started — bringing proximity to near-live systems during verification and the walkthrough. Controls are establishing the system status (what is live/energized/pressurized), safe verification and walkthrough practices (not contacting live systems, maintaining safe distance), awareness of near-live systems, fall protection for at-height examination, and the walkthrough controls.
Why are PSSRs required for some processes?
Pre-startup safety reviews are required by process-safety-management regulations (such as OSHA's PSM standard) for covered processes precisely because starting up a new or modified system without confirming it is safe can lead to a catastrophic release or incident — the PSSR is the formal confirmation that the system is safe to start. Controls are conducting the PSSR per the regulatory/procedural requirements, verifying construction complete, safety systems functional, and procedures/training ready, and not starting up until the PSSR confirms safe startup.
What is a pre-startup safety review?
A pre-startup safety review (PSSR) is the formal, structured review conducted before a new or modified system is started up — verifying that construction/installation is complete and correct, safety systems are in place and functional, procedures and training are ready, and the system is safe to start. Because it examines near-live systems and its completeness is a critical safety gate, the near-live-systems and review-completeness hazards apply.
Related JHAs
- Mechanical Completion Walkdown JHA — the mechanical completion the PSSR follows
- First Fire Preparation JHA — the startup the PSSR gates
- Plant System Turnover JHA — the system turnover the PSSR supports
- Power Plant Mechanical Commissioning JHA — the commissioning the PSSR precedes
Written by Mustafa Tok, CSP, ASP, CHST — OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.