Three Mile Island HRA Using THERP We will be using the
Three Mile Island HRA Using THERP We will be using the Three Mile Island incident to demonstrate how a Technique for Human Error Rate Prediction (THERP) analysis is done. First, take a look at thisSummary Sheet on THERP (PDF)(Links to an external site.)hosted by Alions System Reliability Center website. Next do the following activities. Steps 1-3 of the Summary Sheet on THERP are given below as a guide for yourTHERP analysis: Step 1:Define the system or process. This involves describing the system goals and functions and the consequences of not achieving them. It also requires identifying mission, personnel, and hardware/software characteristics. TheMeltdown on Three Mile Island? video( https://www.youtube.com/watch?v=D8W5hq5dsZ4)in Module 1 gave you an understanding of the situation on that fateful day, Wednesday, March 28, 1979. Review thevideo if needed (use time segment 3:15 4:10 to focus on the key aspects needed for this assignment). Step 2:Identify and list all the human operations performed and their relationships to the system or process tasks and functions. This requires an analysis of all operator and maintainer tasks. Take a look at the human operations depicted in theFault Tree (PDF)of what occurred in segment 3:15 4:10 of the video. Step 3:Predict error rates for each human operation or group of operations. Errors likely to be made in each task or subtask must be identified. Errors that are not significant in terms of system operation are ignored. This step includes estimating the likelihood of each error occurring and the likelihood of an error not being detected. For this step, use theEvent Tree (PDF)provided to fill in the error rates. Determine the basis human error probability (HEP) based on the event tree provided. You will be using data found in theNRC: Handbook of Human Reliability Analysis with Emphasis on Nuclear Power Plant Applications (PDF)(Links to an external site.)(NUREG/CR-1278). Go to Chapter 20 to see how to use the THERP tables to locate probability values. For this case, the data sources in the NUREG/CR-1278 tables are shown for each action in the table below. Given that the operators omitted a procedural step from a long (>10 items) list of procedures, what should the Basic Human Error Probability (HEP) for each action be? ActionsHEP (error factor) Data Sourcein NUREG/CR-1278 Operators fail to restore signal power 20-7 (2) Operators fail to restore power to controls 20-7 (2) Operators fail to close the relief valve 20-13 (2) Operators fail to close the drain valve 20-13 (2) Upload yourevent treewith associatedBasic HEPfor each branch of the tree
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