Westinghouse Nuclear Reactor Design Flaw Is Found - NYTimes.com

By MATTHEW L. WALD

Published: May 20, 2011

"Mr. Jaczko said the commission was asking Westinghouse not only to fix its calculations but also to explain why it submitted flawed information in the first place. Earlier this year the commission staff said it needed additional calculations from Westinghouse to confirm the strength of the AP1000’s shield building. The building has not been built; the analysis of its strength and safety is all computer based."