A drywell pressurization test was conducted at LLL on February 1, 1977, as part of the NRC /sup 1///sub 5/ scale pressure suppression experiment. A series of four test runs were completed with predicted initial drywell pressurization rates of 14.0, 18.6, 23.0, and 26.0 psi/sec (96.5, 128, 159, and 179 kPa/sec). Each test run consisted of charging various combinations of bottles with nitrogen under high pressure, evacuating the drywell to /sup 1///sub 5/ atmosphere, and opening a valve between the two to allow quick pressurization of the drywell. The pressure-time signatures of all four test runs were in excellent agreement with predicted results made through (1) a computer model developed at LLL and (2) the CONTEMPT-LT computer code which was run by E.G. and G. at the I.N.E.L. Based on the results of the test, only very minor adjustments will be made for the upcoming nitrogen tests with the drywell and toroidal wetwell system linked together.

The tritium effluent control project to reduce emissions at Mound Laboratory and its application to liquid wastes are described. Research progress reported includes increasing the power of the Nd:YAG laser for detritiating voluminous wastes by molecular photoexcitation, and analysis of gas produced from tritiated water and octane. (DLC)