Operating hazard analysis

The operating hazard analysis (OHA) analyzes hazards associated with the maintenance and operation of the system, with emphasis on human factors, training and procedures, and the person-machine interface. The OHA is sometimes called the O SHA (operating and support hazard analysis). 

The OHA is normally prepared by the system safety working group and reviewed by management review boards. 

Detailed project description and design information applicable codes, standards, and regulations the PHL, PHA, SSHAs and SHA and operating and maintenance procedures (draft or final) are needed to perform an OHA. Detailed equipment envelopes and data about the size, composition, skill levels, and organization of the personnel operating and maintaining the system are also required. 

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Common hazard analysis tasks include the preparation of a preliminary hazard analysis, systems and subsystem hazard analyses, and an operating hazard analysis. These tasks also aid in the hazard control and hazard reduction effort. 

Again the process involves a preliminary hazard analysis to be done very early in the concept stage, followed by subsystem hazard analysis as subsystems are developed, systems hazard analysis that looks at interfaces between subsystems, and, finally, the operating hazard analysis, which tends to add the human element and evaluate procedures. 

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. 

The prioritized list of controls for hazards may be called the safety precedence sequence, the hazard reduction precedence, the hazard control sequence, the system safety sequence, or any of several other terms. The only real difference between an operating hazard analysis (OHA) and an operating and support hazard analysis (O SHA) is the name. 

Laundry lists of analyses frequently mix types of analyses (preliminary hazard analysis, system hazard analysis, and operating hazard analysis) with the methods or techniques for performing analyses (fault tree analysis, energy trace and barrier analysis, failure modes and effects analysis, common cause analysis, change analysis, and so on). Whether fault hazard analysis is a type or a method depends upon the reference in use. For all practical purposes, fault hazard analysis and system (or subsystem) hazard analysis seem to be the same thing, which is apparently called gross hazard analysis occasionally. 

The operating hazard analysis (OHA) is normally started and sometimes completed during this phase, even though, if adequate information is available, the OHA may be initiated in the design phase. Hazards associated with the human interface and with operating and maintenance procedures should be identified at this time. Project evaluation tree (PET) analysis is the preferred technique for performing OHAs. 

An operating hazard analysis and/or a job safety analysis should be performed to identify hazards associated with disposal operations. 

In all cases, a very important analysis and control effort should be initiated and, if sufficient data are available, completed during the production phase. The operating hazard analysis (OHA) focuses on the human interface with the end product. It examines the adequacy of maintenance and operating procedures and instructions and, if appropriate, the adequacy of the organization and training of maintenance and operations personnel. The recommended technique for completing the OHA is the project evaluation tree (PET) analysis. 

The analysis and control of hazards during the disposal phase should be addressed with an operating hazard analysis, a job safety analysis (a occupational and industrial safety tool), and/or change analysis. 

What techniques are recommended for conducting an operating hazard analysis When is it performed By whom ... 

The most logical analysis to update is the operating hazard analysis. Updates can generally be accomplished by conducting a new OH A at each update point and/or by conducting a comprehensive change analysis to evaluate the differences in procedures, personnel, plant, and hardware between the original analysis (or last update) and the current analysis. 

The purpose of the project evaluation tree is to provide a relatively simple, straightforward, and efficient method of performing an in-depth evaluation or analysis of a project or operation. It is best suited for performing operating hazard analysis and accident analysis. It can also be a valuable review and inspection tool. If adequate information is available, PET analysis may be helpful in performing preliminary hazard analysis, subsystem hazard analysis, and system hazard analysis. 

Unfortunately, the state of the art in software hazard analysis appears to be woefully lagging. Even though traditional hazard analysis techniques like fault tree analysis and tailored versions of operating hazard analysis may be applied to the evaluation of software, validated, specific methods of software hazard analysis appear lacking. 

Preliminary Hazard List — Prebnnary Hazard Analysis — Operating Hazard Analysis —Job Safely Artalysis Job Safely Analysis... 

I—Wh Review — System Hazard Analysis — System Hazard Analysis —Mgml OversighI A Risk Tree — Operating Hazard Analysis... 

Falue Modes EleclsAnalyz —Paul Tree Analysis —Operating Hazard Analysis l-Whal-lf Analysis... 

T. F. O Brien, Emergency Vent Scrubbing Systems—Design Operation Hazard Analysis, Seventh Annual Electrode Corporation Chlorlne/Chlorate Seminar, Cleveland, OH (1991). 

Applioation to Offshore Operations Hazards Analysis Methods... 

Preliminary Hazard List - Preliminary Hazard Analysis Operating Hazard Analysis - Job Safety Analysis - Job Safety Analysis... 

What-lf Review -0 System Hazard Analysis System Hazard Analysis -0 Mgmt Oversight and RiskTree Operating Hazard Analysis... 

Operating Hazard Analysis Change Analysis -0 Change Analysis - HAZOP Study... 

Failure Modes and Effects Analysis —0 Fault Tree Analysis Operating Hazard Analysis - What-lf Review... 

The purpose of the Operating and Support Hazard Analysis (O SHA), sometimes called the Operating Hazard Analysis (OHA), is to... 

Operating and Support Hazard Analysis A system safety analytical technique (also know as the operational hazard analysis) which focuses primarily on the hazards associated with or caused/enhanced by the human/task interface of system operations. 

O Brien, T. F., "Emergency Vent Scrubbing S)rsteins— Design Operation Hazard Analysis," Electrode Corp. Chlorine/Chlorate Seminar, Cleveland, 1991. 

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