Preliminary hazard list

Prior hazard analyses (for example, preliminary hazard list, preliminary hazard analysis, and failure mode and effects analysis) should also be... 

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

Assessment. An analysis of the hazards present in this laboratory show the most significant hazard to be the release of vapor CSM from engineering controls and into the workplace. The significance of this hazard mandates further efforts in system safety in the form of a Preliminary Hazard List (PHL) and a Preliminary Hazard Analysis (PHA). The user must in this instance take an active role in the design review process. 

Preliminary Hazard List Description. The incorporation of this information into a PHL entry is shown as Table I. This entry describes the nature of the hazardous event (column 1), why or how the hazard may result in a mishap (column 2), the effects on operating personnel, equipment, and the facility (column 3), the risk assessment code assigned to the uncontrolled hazard (column 4) and any comments the originator may have (column 5). 

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). 

Purpose. The purpose of Task 201 is to compile a preliminary hazard list (PHL) very early in the system acquisition life cycle to enable the MA to choose any hazardous areas on which to put management emphasis. 

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

Hazard discovery forms are useful feeder documents for preliminary hazard lists. 

Very little real analysis is completed during the concept phase because analysis detail and data are generally not available. A preliminary risk assessment code (RAC) is determined, however, as part of the preliminary hazard list. This initial RAC is used to aid in determining the initial scope of the system safety effort and in the early evaluation of alternative designs and approaches. 

Even though no formal attempt is made to control hazards and controls are normally not addressed in preliminary hazard lists, some control may be achieved by eliminating obviously hazardous approaches during the initial screening of concepts. 

The preliminary hazard list (PHL) dcKuments and provides initial assessment of hazards identified very early in the life cycle. The PHL is a feeder document for the preliminary hazard analysis (PHA) and provides the first information to aid in scaling the system safety effort. 

The preliminary hazard analysis (PHA) expands the preliminary hazard list by identifying additional hazards, analyzing identified hazards, recommending hazard controls, and determining the level of risk after the controls are... 

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. 

First, collect the input documents and reference resources. The primary input documents include an analytical tree and/or block diagram, drawings, and narrative descriptions of the system. The most important resources are a data base, lessons learned file, historical data, and/or other source(s) of failure rates or other reliability statistics. The preliminary hazard list (PHL), preliminary hazard analysis (PHA) and any other hazard analyses should also be available. 

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

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. 

In an effort to demonstrate the utDity of the preliminary hazard list and the preliminary hazard analysis in the initial evaluation of system risk, an example of a simple vapor degreaser in a manufacturing facility will be examined. This illustration will utilize the PHL in the development of the PHA in the method discussed earlier in this chapter. However, it must be noted from the outset that this example is intended... 

Since we have begun this analysis during the concept phase of the project life cycle, it would be prudent to develop a preliminary hazard list of basic safety concerns associated with the project concept. Then, as the project moves into the design phase, a PHA can be performed on the basis of the information contained on the PHL. 

In the analysis of system safety, the initial process begins with the development of the preliminary hazard list during the project or system concept phase. Although it is not always compiled in aU cases, an available PHL can become the working foundation for the development of the preliminary hazard analysis during the design phase of the project life cycle. 

Figure 6.10 Vapor degreaser preliminary hazard list worksheet.

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