Preliminary hazard matrix

PRELIMINARY HAZARD MATRIX DATE PROGRAM EVALUATED ENGINEER ... 

Figure 6.5 Sample preliminary hazard matrix. (Note Examples have been used under column heading Potential Areas for Failure. )...

A critical assembly is a split bed on which fissionable material used to mock up up a separated reactor core that is stacked half on each half. One half is on roller guides so that the two halves may be quickly pulled apart if the neutron multiplication gets too high. Use the Preliminary Hazards Analysis method described in section 3,2.1 to identify the possible accidents that may occur and the qualitative probabilities and consequences. List the initiators in a matrix to systematically investigate the whole process. Don t forget human error. 

First, the importance of learning lessons from past process safety incidents is highlighted in Section 3.2. The subsequent section presents preliminary hazard review procedure, risk matrix, what-if method, plot plan and layout review, pressure relief system review and fire safety design aspects. Section 3.4 presents PHA techniques and procedures hazards and operability analysis (HAZOP), failure modes and effects analysis (FMEA), instrumented protective system (IPS) design, fault trees, event trees, layer of protection analysis (LOPA) and finally SIS life eyele. The importanee of revision of PSI is highlighted in Seetion 3.5. 

A Brief Overview of Selected System Safety Analytical Approaches Working with the Risk Assessment Matrix Preliminary Hazard Analysis Energy Flow/Barrier Analysis Failure Modes and Effects Analysis Fault Tree 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. 

Definition of hazard, risk discussions on likelihood, consequence risk — register, matrix, ranking. Consequence ranking, preliminary hazard analysis tolerance point—ALARP refreshing on mathematics, fault tolerance, plant ageing, and basic functional safety fail safe operations in plants. 

From Clause 4-3.3 it is clear that the most common form of qualitative risk analysis is the risk matrix and risk ranking (Chapter I). Generally, preliminary hazard analysis (Clause 4.0 of Chapter I) is done to obtain rough knowledge about the risk profile for... 

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