At least every five (5) years after the completion of the initial process hazard analysis, the process hazard analysis
shall be updated and revalidated by a team meeting the requirements in paragraph (e)(4) of this section, to assure
that the process hazard analysis is consistent with the current process.
Employers shall retain process hazards analyses and updates or revalidations for each process covered by this
section, as well as the documented resolution of recommendations described in paragraph (e)(5) of this section for
the life of the process.
PrHA is a systematic method to identify and assess process hazards, and is the cornerstone of a
PSM program. PrHAs can be used to identify causes and consequences of potential accidents
associated with equipment, instrumentation, utilities, human performance, external factors, and
natural phenomena such as earthquakes. The objective of PrHA is to determine areas of
excessive risk where preventative and mitigative measures may be warranted to better control
the hazards. PrHAs can help identify accident scenarios leading to worker injuries or fatalities,
property damage, public exposure to chemicals, environmental impacts, or other adverse
Corresponding DOE Programs and Requirements
General Guidance DOE-HDBK-1100-96, Chemical Process Hazards Analysis, provides detailed
information on PrHA methodologies and the PrHA process. DOE guidance available to support
the process hazard analysis team includes DOE/EH-0340, Example Process Hazard Analysis of a
Department of Energy Water Chlorination Process.
Safety Analyses DOE O 430.1B, REAL PROPERTY ASSET MANAGEMENT, requires a
preliminary safety assessment as part of the project management system prior to execution of
design plans. DOE requires that hazard analyses be performed to support SARs under 10 CFR
830 Subpart B NUCLEAR SAFETY MANAGEMENT, SAFETY BASIS REQUIREMENTS
and DOE-STD-1027-92 (CH-1). PrHAs will not replace SARs, nor will SARs replace PrHAs;
they are conducted to satisfy two independent sets of requirements. Therefore, conduct of a
PrHA does not necessarily mean that a SAR must be performed or vice versa. However, because
a PrHA is a systematic method to identify accident scenarios, it may be used as an integral part
of the overall hazards analysis required in the development of a SAR, when a SAR is necessary.
When the PrHA is used to support the SAR, all PSM documents used to develop the PrHA
should be referenced in the appropriate SAR chapter. References and summaries should include
not only the results of the PrHA, but also all documents concerning the resolution of the PrHA
OSHA requires that PrHAs address facility sitting issues (e.g., the physical spacing between
processes, or between a process and administrative facilities). Consideration of natural
phenomenon hazards is also an appropriate sitting issue, especially for new proposed facilities.