Mr. Murray observed that the Monsante and Westinghouse centracts expire on Nevemter 30, and December 15, 1956, and said he had understsod that con'~acts such as these were to be subrnitted to the Commission for consideration well in advance of their expiration date. Mr. Fields indicateé that he would clarify procedures for the Commission review of contract matters. (See AEC 181/83) The Commissioners next discussed the difficulties that have developed with the nuclear propulsion unit in the SEAWOLF, Mr. Murray remarked that in view of the experience with the SEAWOLFreactor, it might be desirable for the Commission to re-evaluate all work on liquid metal cooled reactors, He also suggested that other groups which are engaged in liquid metal reactor development be informed of the problems encountered with the SEAWOLFreactor, Mr. Davis said that the Naval Branch of the Division of Reactor Development is preparing a report on this matter, for distribution to all groups participating in liquid metal reactor development work, Mr, Strauss noted that the difficulties in using stainless steel for containment of liquid sodium had been realized in Reactor Development Division as early as 1953. Mr. Davis reviewed efforts being made to develop improved heat exchangers. Mr. Strauss observed, and Mr, Murray agreed, that the difficulties now being encountered should not discourage efforts to perfect such a reactor. Mr. Libby referred to the apparent disadvantages in using stainless steel for the piping and boiler material of sodium reactors, and said he believed that nickel might prove to be a more satisfactory metal for this purposs. Mr. Davis said that nickel would be extremely difficult to fabricate. - 738 -

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