Modify the event tree of Figure 12-9 to determine the runaways per year if the loss of
Question:
Modify the event tree of Figure 12-9 to determine the runaways per year if the loss of cooling initiating event is reduced to 0.02 occurrence per year.
Figure 12-9
Transcribed Image Text:
Safety function: Identifier: Failures/demand: A 1 Initiating event: loss of cooling 1 occurrence/yr. High-temp alarm alerts operator B 0.01 0.99 0.01 Operator notices high temp 0.25 0.00750 0.0025 Operator restarts cooling D 0.25 0.2475 0.001875 0.000625 Operator shuts down reactor E 0.1 A 0.7425 AD 0.2227 ADE 0.02475 AB 0.005625 ABD 0.001688 ABDE 0.0001875 ABC 0.001875 ABCD 0.0005625 ABCDE 0.0000625 Shutdown = 0.2227 +0.001688 +0.0005625= 0.2250 occurrences/yr. Runaway = 0.02475 +0.0001875 + 0.0000625 0.02500 occurrences/yr. O O O O O O Result Continue operation Shut down Runaway Continue operation Shut down Runaway Continue operation Shut down Runaway
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Related Book For
Chemical Process Safety Fundamentals With Applications
ISBN: 9780134857770
4th Edition
Authors: Daniel A. Crowl, Joseph F. Louvar
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