Investor Presentaiton
US-ABWR Consideration for
Beyond Design Basis External Events
■US-ABWR design includes consideration for beyond design
basis external events
Examples
-Earthquake: HCLPF (High Confidence Low Probability of Failure) capacity at least
equal to twice the SSE is demonstrated for all Standard Plant safety related SSCs.
-Flooding (including Tsunami): Reactor and Control Building doors are protected with
tornado missile barriers, which will limit leakage due to external flooding above the
design basis level. Site specific evaluation can be performed by COL applicant to add
additional flood protection as necessary.
-Tornado: The tornado wind speed and pressure drop in DCD are more conservative
than those in R.G. 1.76 revision 1.
-Extreme Wind: The tornado wind provides substantial margin above the extreme wind.
(See the previous table)
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