Foster Wheeler monitors the KRW PDU operation at Madison, Pennsylvania, for US DOE. In order to analyze PDU results, Foster Wheeler provides independent heat and material balances based on input from KRW's DIS data reports. The Foster Wheeler balances have continually indicated significant discrepancies in both the closure of elemental balances, especially hydrogen, and the heat balance. In addition, apparent forcing of oxygen and hydrogen balances is in evidence in some of KRW's latest reports. In response to the Operating Committee's directive, Foster Wheeler reviewed the methodology currently employed by KRW in reducing the data logs and periodic stream analysis to the final steady state values and balances reported in the DIS reports. In general Foster Wheeler found KRW's procedures to be satisfactory although several areas for correction and improvement were noted. Major Foster Wheeler recommendations include provision for: improvement in coal analysis accuracy by increased sampling and selective discarding of questionable data; resolution of the problems of missing hydrogen atoms; improvement in product gas flow rate measurement by use of a vortex shedding flowmeter as a back-up product gas flow rate indicator; and improvement in KRW's heat and material balance format. 18 figs., 24 tabs.