A va il abl e fro m GPO Sa les Program Divi sion of T echnical Information and Docum ent Contro l U .S. Nucl ea r Regul atory Com m iss ion Washington, D .C. 20555 Th is report was prepared as an account of work sponso red by an ag e ncy of the United States Government. Neither the United States Govern ment nor an y ag ency thereof, nor any of their employees , makes any warran ty , ex press or impl ied , or assumes any legal liab ility or rnsponsibility for the accuracy , compl eteness, or

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... ulness of any information , apparatus . product, or process disc losed , o r represents that its use would not infringe privately owned rights . Refere nce herein to any specific commercial product, process , or service by trad e name , trademark , manufacturer, or otherwise, does not necessarily co nstitute o r imply its endorserrient , recommendation , or favor ing by the United States G o vernm ent or any agency thereof. The views and op inions of authors expressed he re in do not necessarily state or reflect those of the United States Governmen t o r an y agency thereof.