mo ~2afor a five minute run, At this tirne Dr. Schreiber showed movies of the. Kiwi-A test, During the test a failure in part of the internal mechanism . allowed & considerably higher temperature to be reached than had been anticipated, However, the test was eseentially a euccess, " ie now being assembled, Kiwi-A Prime It was brought to coo! critical last week, and plane are to test it in Nevada in June. Kiwi-A~-3 will follow in about two months, ? and the main difference in Kiwi- A Prime and Kiwi-A-3 with Kiwl-A is primarily in the coating of the holes in the graphite. Kiwi-B-1] will be hydrogen cooled nozzle. It will have a factor af 10 greater in power than the ‘KiwieA series, ‘It will use liquid hydrogen rather than gaseous hydrogen, . and it is to be tested in the last half of 1961, One thing that will delay the testing is that it requires a new test cell to be constructed. Kiwi-B-2 will follow by another 6 months, The primary difference here is that Kiwi-B-2_ fu /> will use pneumatic control rod actucators which do not require shielding as. do the hydraulic type in Kiwi-B-1, : ( » . Discussion of Radiation Problems é Se ary First we have to define a basic power cycle, which is one begawatt for 5 | minut¢s, Now, if a complete callapse occurred,only 3% of the available radio- . activity is released. If the whole reactor is aubmerged in water even leas radioactivity is released, Using the basic power cycle it le possible to runn 10,000 tests in a year and just compensate for the 2% decay in the biosphere.

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