<p>LAS VEGAS – The head of a panel of scientists reviewing plans for a national nuclear waste dump in Nevada is quitting, telling President George W. Bush that allegations of conflict of interest are hampering the board's work.</p>
<p>One Nevada lawmaker opposed to the Yucca Mountain nuclear waste repository welcomed the departure of Michael Corradini from the Nuclear Waste Technical Review Board, saying he "displayed a wanton disregard for impartiality."</p>