March 12, 2018
March 12, 2018






This assignment is related to the following learning outcome(s):

  1. Appreciate the philosophy and terminology relating to the idea of risk

Part A Energy and non-energy threats

What is the energy source or non-energy threat with which we would characterise each of the following cases? Please note that the form an energy takes can (but does not always) change during an Occurrence, so that the form of the energy that is appropriate for this answer is the form appropriate to the Event itself. Read the notes to understand what this means. There are correct and incorrect answers. [3 marks each]

  1. An explosion occurs in a coal mine in New Zealand, trapping or killing 29 miners. Subsequent explosions lead to the mine being sealed without bodies being recovered. A month later the mine goes into receivership. Explosions in coal mines are not uncommon, as you’ll find if you look at web sources. Often the exact reason is not known but there are two common possibilities. One is that the process of mining may penetrate pockets of hydrocarbon gas. The other is that the process creates coal dust.
  2. A light aircraft hit a power line when on final approach to the end of the runway at Geelong airfield. The contact with the power line decelerated the plane to such an extent that it hit the road and then the road-side embankment of the main road that also runs along the airfield boundary. Remarkably, the two people on the plane escaped and ran away before the plane burst into flames. The power line was broken and interrupted the power supply to Torquay and a number of other small communities. This interruption lasted at least four hours. Power lines were lying on the road so one carriageway of the road was closed for some hours while they were removed. The burning wreckage of the plane also closed the other carriageway. The plane actually hit the carriageway in a 100km/hr zone and it is surprising that vehicles on the road were not directly affected.
  1. A sick woman was being transferred from a cruise ship to another vessel for emergency medical treatment when she fell into the sea. This was in the very cold North Sea. The woman later died in hospital, apparently largely as a result of the exposure to the cold water.
  2. A suspension bridge collapses, apparently when a suspension cable breaks. A number of people and vehicles fall from the bridge into the river, where some 11 people die due to drowning.
5. A couple were walking along a beach beneath a cliff, part of which collapsed and buried them. Page 2! of 4!

RSK80003 Risk Perception and Analysis

  1. A building (the Rana Plaza, in Bangladesh) housing a clothing factory collapsed killing some 1100 people.
  2. A Japanese factory worker allegedly poisoned frozen fish food with pesticides. At least 2483 people complained of illness after eating foods.
  1. A large fire burns at an open cut coal mine near Melbourne, apparently ignited by a nearby grass and forest fire lit by arsonists. Smoke envelops the nearby town of Morwell and results in significant deterioration of the air quality, such that evacuation was considered at one stage. The owners of the old mine and the nearby power station had apparently removed water pipes placed there for possible future fire fighting.
  1. A wild life park keeper was killed by a tiger when she was working in the cage. The tiger was supposed to be contained within a cage itself within the cage being worked on. Systems were said to be in place to ensure that keepers and animals were kept apart at all times. A bolt on top of one of the internal doors was found to be defective, in that it was unable to secure the door.
  • A mine tailings dam in Brazil, owned by BHP Billiton and VVale, fails, leading to widespread destruction and loss of life.

Part B  Applying the time sequence model

A cargo ship ran aground on the Great Barrier Reef just outside Gladstone, Queensland. The first mate (second in charge to the captain) was in charge of the vessel at the time. He had supervised docking and loading in Gladstone over a period of about 28 hours and then the de-docking, after which he went off for 2 hours rest (his first rest in 38 hours) before being due back on watch after departure from Gladstone.

After de-docking, The second mate plotted a course with the Captain and set a course through the commonly-used short cut to the sea-lane. The coordinates for all of the needed course changes except for the last had been entered by them into the navigation computer. This fact was communicated to the first mate when the second mate handed over duty to him. The first mate was told to remember to put these coordinates into the navigation computer. He forgot to do so and as a result the ship ran aground.

 This is a test of understanding, logic and precision. There are correct and incorrect answers.

  1. Describe the various types of Consequences that would have arisen from the case. [3 marks]
  1. Describe in simple terms the Severity (size or significance) of each of these Consequence types. [3 marks]
  1. Provide a formal definition of the Event (this means look at the formal definition and relate it to this energy source and this situation) and a more simple and colloquial statement of it. [4 each – 8 marks]
  2. What possible Mechanisms are there for the Event. You don’t need to be a specialist to answer this, common knowledge will suffice. [6 marks]
  1. What do you think the pre-conditions of the Mechanism are? You need to have a proper understanding of what is meant by this term. [6 marks]

 RSK80003 Risk Perception and Analysis

  1. What is the Outcome of the Event? Describe other possible Outcomes you can imagine. [4 marks]

Part C Time Zone 1

In the context of the ship grounding and using the information that may be found on the WWW, consider the various possible categories by which Time Zone 1 of the Time Sequence Model can be usefully described. The notes indicate a number of different approaches to this as well as the importance of considering both conditions and circumstances.

  1. Select one of those approaches and provide a cogent (look up the dictionary definition of this) argument for its use over the others. [15 marks]
  1. Use the categories you have chosen to describe the actual Time Zone 1 situation as best you can from the information available to you. You’ll note that Time Zone 1 is the here and now of operations and you need to consider it in the context of the grounding not yet having happened. [15 marks]

Part D Quantifying estimates of risk

Describe a Risk with which you have some familiarity or interest. Take care to ensure it really is a Risk and is not a ‘cause’ or a failed control measure etc.

  • What are the units of Exposure for this Risk. [6 marks]
  • How would you describe the measure (that is the meaning) of Probability for this Risk? Be very careful in understanding the theory given in the notes. [6 marks]
  • What are the units of Frequency for this Risk? [6 marks]
  • Explain the nature of the Consequences arising from this Risk. In your judgement, what is the range of Consequence Values applicable to each of the Consequence types that are relevant to this risk? [6 marks]
  • Provide a critical commentary of the definition of Risk in the ISO guide to Risk Management, given in the notes, in the context of the formal discussion of the subject in the notes. [6 marks]

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