Unlike the PHA, the PSSR provision does not specify a team, team qualifications, or sign-off. 29 CFR 1910.119(i)(2) requires that, prior to the introduction of highly hazardous chemicals, the PSSR confirm that construction and equipment are in accordance with design specifications; safety, operating, maintenance, and emergency procedures are in place and adequate; a PHA has been performed for new facilities and recommendations resolved, and modified facilities meet MOC; and training of each employee involved in operating the process has been completed. How you staff and document that review is up to you, but you must be able to show each item was confirmed. OSHA has issued few letters on PSSR staffing; the ones below address when PSSR applies.

What OSHA Has Said

Jan 11, 1996
What PSSR must confirm, and when it applies
OSHA explained that a PSSR applies to new facilities and to modified facilities when the change requires a change in process safety information, and that for slight modifications that don't change PSI, a PSSR is not intended; those go through MOC.
Read OSHA Letter ↗
Sep 20, 2019
PSSR before restarting modified facilities
In its letter on extended shutdowns, OSHA said a pre-startup safety review is required before highly hazardous chemicals are introduced into modified facilities under (i)(1) and (i)(2), along with MOC, updated PSI and procedures, and a review of training.
Read OSHA Letter ↗

⚡ Key Compliance Takeaway

Because the standard sets the content but not the team, write your own PSSR procedure: who participates (operations, engineering, maintenance, and safety at minimum), who has authority to approve startup, and a checklist tied to each (i)(2) item. Keep the signed record. Inspectors will look for evidence that every item was verified before chemicals went in.