President Bush on Wednesday announced his intention to name two members to the National Labor Relations Board: Atlanta attorney John N. Raudabaugh and board member James M. Stephens, who is to be reappointed and named chairman. The White House also announced Bush will name: _Earl Roger Mandle, deputy director of the National Gallery of Art, as a member of the National Council on the Arts. _Rep. Norman Sisisky, D-Va., as a member of the board of trustees of the James Madison Memorial Fellowship. _Washington attorney Edwin D. Williamson as legal adviser to the State Department, succeeding Abraham Sofaer. _C.M. Schauerte, vice president for American General Corp., in Houston, as federal insurance administrator of the Federal Emergency Management Agency.