The Subsystem Hazard Analysis Report

The SSHA report is completed after the SSHA is fully developed. K more than one SSHA is performed (i.e., at the 35%, 50%, and/or 65% design phase), a detailed 

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The subsystem hazard analysis report contains a description of the subsystem and a narrative summary of key findings that specifically address the adequacy of the controls placed on any high hazards associated with the end products, the level of residual risks that remain after controls have been applied, and recommendations for further analysis or testing. The report should also describe the techniques and methodology used in performing the analysis, including risk assessment and risk acceptance criteria. The report should also contain the hazard report worksheets used in the study. 

The information recorded on the PHA worksheet, together with the PHA report, will greatly facilitate the performance of other benehcial system analyses (such as the subsystem hazard analysis, the failure mode and effect analysis, and the operating and support hazard analysis) that may be accomplished during the remaining phases of the product life cycle. 

The MORT tools and techniques can be helpful in preparing a safety analysis report (SAR), the upstream safety product most frequently required for new DOE programs, but the more common system safety products (system safety program plan, preliminary hazard analysis, system/subsystem hazard analysis, operating hazard analysis) are not a dominant part of the MORT program and are seldom even referenced in System Safety Development Center (SSDC) documents. 

System safety should be involved in the PDR, typically making a presentation summarizing the safety effort to date, the DSFs in the system design, and the current level of mishap risk which the design presents. System safety provides, as a minimum, a subsystem hazard analysis (SSHA), SHA, safety assessment report (SAR), and final safety requirements for this review. 

Safety analysis report (SAR) A document prepared to document the results of a hazard analysis performed on a system, subsystem or operation. Hie specific minimum data elements for an SAR will be defined by data deliverable requirements for the program or project (NSTS 22254). 

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