Modify the event tree of Figure 12-11 to determine the runaways per year if the loss of
Question:
Modify the event tree of Figure 12-11 to determine the runaways per year if the loss of cooling initiating event is reduced to 0.80 occurrence per year.
Figure 12-11
Transcribed Image Text:
Safety function: Identifier: Failures/demand: Initiating event: loss of cooling 1 occurrence/yr. High-temp Operator Operator High-temp Operator alarm alerts notices restarts shutdown shuts down operator high temp cooling reactor A 1 B 0.01 0.99 0.01 C 0.25 0.00750 0.0025 D 0.25 0.2475 0.001875 0.000625 E 0.01 F 0.1 A 0.7425 AD 0.2450 ADE 0.002228 0.002475 ADEF 0.0002475 AB 0.005625 ABD 0.001856 ABDE 0.00001688 0.00001875 ABDEF 0.000001875 ABC 0.001875 ABCD 0.0006187 ABCDE 0.00000563 0.00000625| ABCDEF 0.000000625 Shutdown = 0.2450 +0.001856 +0.00001688 +0.0006187 = 0.2475 occurrences/yr. Runaway=0.0002475 +0.000001875 +0.000000625=0.0002500 occurrences/yr. Result Continue operation Shut down Shut down Runaway Continue operation Shut down Shut down Runaway Continue operation Shut down Shut down Runaway
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To modify the event tree based on the new initiating event occurrence rate of 080 per year we need to adjust the initial probability at the root of th...View the full answer
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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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