Fire Safety Science Digital Archive

IAFSS Symposiums

IAFSS Symposiums All Symposiums Symposium 1 Symposium 2 Symposium 3 Symposium 4 Symposium 5 Symposium 6 Symposium 7 Symposium 8 Symposium 9 Symposium 10 Symposium 11 Fire Research Notes AOFST Symposiums
Reliability Study On The Lawrence Livermore National Laboratory Water-supply System

Hasegawa, H.K. and Lambert, H.E., 1986. Reliability Study On The Lawrence Livermore National Laboratory Water-supply System. Fire Safety Science 1: 611-620. doi:10.3801/IAFSS.FSS.1-611


We conducted a reliability analysis of the Mocho water-supply system for the Lawrence Livermore National Laboratory (LLNL) to determine if an adequate supply of water would be available in the event of a major fire. We used the digraph fault-tree approach for logic model generation. The initiating-enabling event interval reliability approach was used for a probabilistic evaluation of the Mocho system fault tree. In the event of a major fire, the Mocho system demand unavailability was calculated to be 3.6 x .0001. We identified 16 single-component failures that would cause failure of the control loop which monitors storage-tank level. These failures would go undetected by monitoring personnel at LLNL. Our recommended changes would provide a redundant measurement of the tank level, resulting in a decrease of the predicted system unavailability by about a factor of 50.


Digraph fault tree, Mocho system fault tree, Risk analysis:, Water: supply system

View Article

Member's Page | Join IAFSS | Author's Site

Copyright © International Association for Fire Safety Science