Three mile island hra using therp: part 1

 

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 this Summary Sheet on THERP (PDF) (Links to an external site.) hosted by Alion’s 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 your THERP 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.

The “Meltdown 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 the video 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 the Fault 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 the Event 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 the NRC: 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 Source in

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 your event tree with associated Basic HEP for each branch of the tree.

Calculate your paper price
Pages (550 words)
Approximate price: -

Why Work with Us

Top Quality and Well-Researched Papers

We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.

Professional and Experienced Academic Writers

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.

Free Unlimited Revisions

If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.

Prompt Delivery and 100% Money-Back-Guarantee

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.

Original & Confidential

We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.

24/7 Customer Support

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

Calculate the price of your order

Total price:
$0.00

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.

Essays

Essay Writing Service

No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.

Admissions

Admission Essays & Business Writing Help

An admission essay is an essay or other written statement by a candidate, often a potential student enrolling in a college, university, or graduate school. You can be rest assurred that through our service we will write the best admission essay for you.

Reviews

Editing Support

Our academic writers and editors make the necessary changes to your paper so that it is polished. We also format your document by correctly quoting the sources and creating reference lists in the formats APA, Harvard, MLA, Chicago / Turabian.

Reviews

Revision Support

If you think your paper could be improved, you can request a review. In this case, your paper will be checked by the writer or assigned to an editor. You can use this option as many times as you see fit. This is free because we want you to be completely satisfied with the service offered.