Assignment 1(d): 4 Marks The following scenario is for a nuclear power plant system. The Initiating Event (IE) for the Event Tree is "a pipe break in the cooling sub-system" that begins the scenario, with a frequency of once every thousand years. The barriers that are relevant (in the sequence they will be activated) are as below: 1. Electricity: The probability of Electricity being available is 99 out of hundred times. 2. Emergency Core Cooling: The likelihood of Emergency Core Cooling being available is 0.85. 3. Fission Product Removal: The chance of Fission Product Removal failure is 10% of the times. 4. Containment: The probability of Containment fails is 1 out of ten times. You are required to: Calculate the probability for a "Large & Very Large Fission Release", Calculate the probability for a "Medium Fission Release" Calculate the probability for a "Small & Very Small Fission Release" Pivotal Events Outcome Initiating Event Electricity Emergency Fission Product Containment Fission Core Cooling Removal Release Available Very small Available Fails Small Available Available Small Fails Available Fails Medium Available Large Pipe Breaks Fails Fails Very large Fails Very large