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Assessment of core damage frequencies for inact circuit faults on a PWR plant
Author:	Wisson, Andrew
Co-Author(s):

Low frequency intact circuit fault sequences (generally sequences involving reactor protection system failures) can be an important contributor to the overall risk of core damage on a Pressurised Water Reactor (PWR). Traditionally Rolls-Royce has assessed these sequences for the Probabilistic Safety Assessment (PSA) on a best-estimate basis to determine whether or not core damage occurs. This best-estimate approach ignores the uncertainties which are inherent with the thermal analysis, particularly with the data. It is possible to demonstrate no core damage on a best-estimate basis even when the true probability of core damage is only slightly less than 50%. A method of statistical transient analysis has been developed which allows the contribution to core damage frequency from less severe sequences (i.e. those that would not give rise to core damage on a best-estimate basis but which would give rise to core damage on a worst-case basis) to be assessed efficiently.

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Price:	£21.28 (£21.28 inc.)
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