PRISM Forum - Message Replies


Topic: PRISM Questions and Answers
Topic Posted by: SRC (src_forum@alionscience.com )
Organization: SRC
Date Posted: Wed Jan 12 8:33:33 US/Eastern 2000
Topic Description: Welcome to the PRISM forum! Please feel free to post your questions and comments about the PRISM assessment software here.

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Original Message:

Posted by: Nagaraj
Date posted: Thu Aug 24 8:34:37 US/Eastern 2006
Subject: RAC Data
Message:
I have recently downloaded the demo version of Prism. I have the following doubts in it 1. For the components in OTHER category (E.g. In the example system V1;VALVE, CHECK in the A1;Check/Control Valve Assy.) failure rate given for RAC Data (0.06529)differs with the Merged Failure Rate for the same from (2.072773) source Search. I have tried with the different combinations of Quality and Environment, but I couldn't get that value. What is the reason behind this? 2. In the context of above question, RAC Data Search button popped up a table in which source is listed as Fictional. Is this the case for demo version? tab?


Reply:

Subject: PRISM Demo Questions
Reply Posted by: Tammy
Date Posted: Thu Aug 24 9:24:25 US/Eastern 2006
Message:
1. The RACRates models were specifically developed using data that Alion collected as the operators of the DoD's Reliability Analysis Center. The RACRates models are available for capacitors, diodes, integrated circuits (monolithic), resistors, software, thyristors, and transistors only. Components listed in the Other category include all other component types that are summarized in the Electronic Parts Reliability Data (EPRD-97) and Nonelectronic Parts Reliability Data (NPRD-95) publications.

2. All data provided in the PRISM demo version is fictional therefore the failure rate information provided is fictional, which results in the difference between the RAC Data failure rate for the Check Valve and the Merged Failure Rate for the same component. In the fully functional version of PRISM the RAC Data failure rate and Merged Failure Rate will agree.

If you have any additional questions, please contact us again.


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