Preliminary hazard list preparing

A PHA was prepared as part of the Parsons/Honeywell EDP, in accordance with MIL-STD-882C. The PHA is based on a preliminary hazards list that describes unmitigated hazards the list will be updated as the design process progresses (DOD, 1993). Numerous PHA work sheets were generated, and recommendations were made to reduce risk. The PHA results were reviewed by a multidisciplinary group from the Parsons/Honeywell team, which will track the means of mitigating hazards. 

A typical system safety task for hazard identification would be the preparation of a preliminary hazard list (PHL). Hazard identification or discovery is accomplished by reviewing lessons learned, accident reports, and other historical data. A PHL may be prepared through an informal conference, the use of checklists, and occasionally other techniques such as energy trace and barrier analysis (ETBA). 

During the concept phase, hazard identification is initiated and documented by preparing a preliminary hazard list (PHL). 

Who prepares the preliminary hazard list When What techniques are recommended ... 

The SSWG prepares a preliminary hazard list for the project as described in Chapter 8 (or prescribed in the system safety program plan). 

This particular analytical technique can be used to aid in preparing preliminary hazard lists (PHLs), conducting preliminary hazard analyses (PHAs), subsystem hazard analyses (SSHAs), or system hazard analyses (SHAs). The ETBA may be helpful in performing operating hazard analyses (OHAs) and accident analyses and in other situations. The ETBA seems to be particularly well-suited to facility system safety programs. 

Preliminary drawings or sketches may be adequate to prepare a preliminary hazard list. More detailed drawings are required for a preliminary hazard analysis, and even more detail is required for subsystem and system hazard analyses. Analytical trees, copies of maintenance and operating procedures (if available), and site maps may also be helpful. 

Tools such as the hazard element evaluation checklist (Figure 6.3) and the energy source evaluation checklist (Figure 6.4) (TAI 1989) can be used to facilitate the development of the preliminary hazard list (Figure 6.1). The PHL, together with the PHA matrix, can then be utilized to prepare the preliminary hazard analysis worksheet. 

The ETBA is an analytical technique that can be of great assistance in preparation of the preliminary hazard list (PHL). It can also be quite useful in the development of a preliminary hazard analysis (PHA), subsystem hazard analysis (SSHA), or the more general system hazard analysis (SHA). The ETBA can also be used, depending on the specific system under consideration, in the development of the operating and support hazard analysis (O SHA), and, of course, during the MORT process from which the ETBA evolved. 

The Preliminary Hazard Analysis (PHA) is an analysis of the generic hazard groups present in a system, their evaluation, and recommendations for control (TAI 1989). The PHA is usually the first attempt in the system safety process to identify and categorize hazards or potential hazards associated with the operation of a proposed system, process, or procedure. In many instances, however, the PHA may be preceded with the preparation of aPreliminary Hazard List (PHL). The identification of hazards on a PHL can occur through the use of a variety of methods such as but not limited to... 

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