Attached are the impurity data for 20-liter growth runs N. Zaitseva/L. Carman made in the 1996-1997 time frame for which we have both solution and crystal data. The 5 impurities added for the runs are AI(III), Cr(III), Fe(III), Mo(VI), and Sb(V). As an explanation of the tables, I report all impurity concentrations as ppb (ng/g{sub KDP}) with respect to dry KDP (even solution data.) ''MDL'' stands for ''Method Detection Limit.'' Nominal uncertainties are 1 MDL or 10% of the quoted value, whichever is greater. If the measured value is less than the MDL, I report ''ND,'' for ''Not Detected.'' If the value is greater than the MDL, but less than twice the MDL, I report ''D,'' for ''Detected.'' If the value is more than twice the MDL, I report two significant figures. The values come from ICP-ES and ICP-MS measurements. I give the detection limit for the more sensitive technique in the table under the ''MDL'' heading. In case where only one technique was used, I give the MDL for that technique in parentheses after the impurity value in the table. Since these measurements were made, changes in instrumentation have resulted in significant improvements in many of the detection limits. …

This report provides year end status of PNNL performance against the FY01 critical outcomes.

Seven full-sized Peach Bottom Reactor. fuel elements were fabricated in a cooperative effort by Oak Ridge National Laboratory (ORNL) and Gulf General Atomic (GGA) as part of the National HTGR Fuel Recycle Development Program. These elements contain bonded fuel rods and loose beds of particles made from several combinations of fertile and fissile particles of interest for present and future use in the High-Temperature Gas-Cooled Reactor (HTGR). The portion of the fuel prepared for these elements by ORNL is described in detail in this report, and it is in conjunction with the GGA report (GA-10109) a complete fabrication description of the test. In addition, this report describes the results obtained to date from postirradiation examination of the first two elements removed from the Peach Bottom Reactor, RTE-7 and -4. The fuel examined had relatively low exposure, up to about 1.5 x 10{sup 21} neutrons/cm* fast (>0.18 MeV) fluence, compared with the peak anticipated HTGR fluence of 8.0 x 10{sup 21}, but it has performed well at this exposure. Dimensional data indicate greater irradiation shrinkage than expected from accelerated test data to higher exposures. This suggests that either the method of extrapolation of the higher exposure data back to low exposure …

This report discusses the Social Security recipients that receive a costof- living adjustment (COLA) in January of each year. An automatic Social Security benefit increase reflects the rise in the cost of living over roughly a 1-year period

This report provides year end status of PNNL performance against the FY01 critical outcomes.

High-frequency oscillations (1-100 MHz) in Hall thrusters have apparently eluded significant experimental scrutiny. A diagnostic setup, consisting of a single Langmuir probe, a special shielded probe connector-positioner, and an electronic impedance-matching circuit, was successfully built and calibrated. Through simultaneous high-frequency probing of the Hall thruster plasma at multiple locations, high-frequency plasma waves have been identified and characterized for various thruster operating conditions.

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