Preliminary hazard analysis checklist

Several qualitative approaches can be used to identify hazardous reaction scenarios, including process hazard analysis, checklists, chemical interaction matrices, and an experience-based review. CCPS (1995a p. 176) describes nine hazard evaluation procedures that can be used to identify hazardous reaction scenarios-checklists, Dow fire and explosion indices, preliminary hazard analysis, what-if analysis, failure modes and effects analysis (FMEA), HAZOP study, fault tree analysis, human error analysis, and quantitative risk analysis. 

Furthermore, when simpler techniques (i.e., what-if analyses, checklist analyses) reveal hazardous situations needing additional review, the substance of the preliminary hazard analysis technique may be used. In reality, the technique needs a new name because it has achieved broader use than the original intent, which was as a preliminary assessment system to be used in early concept and design stages for a product or system. 

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. 

Stages Safety Review Checklist Relative Ranking Preliminary Hazard Analysis What-if Checklist HAZOP FMEA Cause- Consequence Analysis Human Reliability Analysis Fault Tree Event Tree... 

FEED stage At the initial FEED stage, PFDs, certain equipment, etc. are fixed and it is in the process of development of a P. ID. At this stage, preliminary hazard analysis, checklists, etc. are utilized for PHA. Then, slowly instrumentation is developed based on layers of protections desired as a safeguard and interlock. 

In ANSI/ASSE Z590.3—2011, the Prevention through Design standard, Addendum G comments on only eight hazard analysis and risk assessment techniques, intentionally. They are Preliminary Hazard Analysis, What-If Analysis, Checklist Analysis, What-If Checklist Analysis, Hazard and Operability Analysis, Failure Mode and Effects Analysis, Fault Tree Analysis, and Management Oversight and Risk Tree (MORT). It was also said in Z590.3 that ... 

Step I— The dendritic construction consists in the identification of the core conditions leading to hazards in the system. A preliminary hazard analysis has been performed in the monitored enterprise, and a checklist of behaviours leading to hazards has been identified. The dendritics leading to hazards have been classified in different groups. These dendritics are reported in Table 1. Many of the identified dendritics are workers behaviours however, some dendritics more related to contextual aspects, such as obstacles not clearly indicated, have been included. 

The proposed method allows the continuous monitoring of OHS conditions in workplaces associated to workers safety performance. The combination of a checklist of dendritics and a control chart seems to be an adequate and sustainable approach for this purpose. On the one hand, the checklist, developed by mean of a Preliminary Hazard Analysis, includes all the hazardous conditions of the company and in particular all the at-risk behaviours. On the other hand, the control chart allows identifying all the hazardous conditions that are critical for the employees. 

The techniques used to complete PHAs inelude What-iF analyses. Explosive Safety Checklist Analyses, General Industry Checklist analyses and FMEA analyses. The information from Preliminary Hazards Analyses, previous Final Safety Analysis Report analyses. Fire Hazards Analyses, and other... 

Potential external events were identified by reviewing previous Safety Analysis Reports of similar DOE facilities (Restrepo 1995) and the recommended list of external events used to evaluate commercial nuclear power plant risks (NRC 1983). In addition, an attempt was made to identify any other potential external-initiating event unique to the site that had not been considered in previous studies. It is important to note that operational accidents (e.g., criticality, internal fires) occurring inside the HCF and assodated radioactive material storage facilities are not considered in this screening process. These types of "internal initiating events are identified separately using preliminary hazard checklists (see Appendix 3A). 

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). 

Preliminary Checklists Safety review Preliminaiy hazard analysis Identify hazards Identify deviations from good practice"... 

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