analysis, engineering studies, field engineering services, nondestructive testing, evaluation or analytical services, metallographic analysis, consulting services, troubleshooting, failure analysis, cleaning, upgrading, tooling, or decommissioning related to: (a). Fired steam generators encompassing fossil fuel boilers which are fueled by combustible fossil fuels (e.g., coal, coal slurry, oil or natural gas) or support subsystems, equipment or components thereof, including fuel drying, fuel feed, pulverizers, burners, combustion systems, grates, pressure parts, air heaters, fans, boiler cleaning systems, ash systems, valves, controls & diagnostics, oxycombustion systems, condensing heat exchangers used in connection with such fired steam generators, other than maintenance and operation services performed as part of overall facility operation and management contracts for domestic or foreign government agencies or entities (including but not limited to NNSA, NASA, DOD, DOE, as well as United Kingdom NDA or MOD sites). (b). Fired steam generators encompassing waste fuel boilers which are fueled by combustible waste fuels (e.g., carbon monoxide, biomass, black liquor, municipal solid waste (MSW) or refuse-derived fuel (RDF)) or support subsystems, equipment or components thereof, including fuel drying, fuel feed, pulverizers, burners, combustion systems, grates, pressure parts, air heaters, fans, boiler cleaning systems, ash systems, valves, controls & diagnostics, oxycombustion systems, condensing heat exchangers used in connection with such fired steam generators, other than maintenance and operation services performed as part of overall facility operation and management contracts for domestic or foreign government agencies or entities (including but not limited to NNSA, NASA, DOD, DOE, as well as United Kingdom NDA or MOD sites). (c). Gasifier systems which partially convert fossil or waste fuels (e.g., coal, oil, natural gas or biomass) to syngas and support subsystems, equipment or components thereof, including fuel drying, fuel feed, pulverizers, burners, combustion systems, gasifiers, heat exchangers used in connection with such gasifier systems, pressure parts, boiler cleaning systems,