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This method covers the determination of Gd2O3 content in sintered UO2 fuel pellets, by X-ray fluorescence spectrometry.

Either Wave Dispersion X-ray Fluorescence (WD-XRF) or Energy Dispersion X-ray Fluorescence (ED-XRF) is applicable, however, this International Standard states a method by using WD-XRF using Gd Lα-line.

This method has been tested for mass fractions of from 2 % to 10 % Gd2O3.

a) This ISO standard specifies requirements and gives recommendations for the design, materials

of construction, modelling, controlling, fabrication, inspection, testing, installation, start‐up

and operation of GT Exhaust Systems with or without WHRU for use on‐shore or off‐shore in

the petroleum, chemical and process service industries.

b) For the purpose of this Standard, the Exhaust System means all items in the turbine exhaust

gas stream between the GT exhaust gas collector outlet flange and the termination to the

atmosphere.

c) The following items are not covered by the scope of this Standard:‐

i. Heat Recovery Steam Generator equipment (HRSG)

ii. Supplementary fired systems see item e) below

iii. Auxiliary fired systems see item e) below

iv. Exhaust Gas Collector (also known as Exhaust Plenum) –see item f) below

v. Fire Detection and Extinguishing Systems –see item g) below

d)  WHRU’s exchange gas turbine exhaust heat into single phase heat transfer media, whilst HRSG’s involve the evaporation of water into steam (a two phase steam mixture) andsuperheating of same. This difference adds significant complexity to equipment and systemdesign, control, safeguarding, operation and construction requirements. Certain technicalrequirements contained in this standard are relevant to HRSG equipment and as such thePurchaser can identify and use those relevant clauses. However in considering HRSG productsthe Purchaser should address such complexities to ensure that all performance andoperational requirements are met

e) GT Exhaust System (including WHRU) equipment covered in this standard is un‐fired. The inclusion of supplementary and/or auxiliary firing equipment and systems adds significantcomplexity to design, control, safeguarding, operation and construction requirements.

f) The GT exhaust gas collector is typically part of the GT scope of supply and accordingly is notcovered in this standard. However certain technical requirements contained within thisstandard may be relevant to the collector and as such the Purchaser may choose to specifypart/s of the standard as technical requirements for the collector supply. Note that both the GTcollector and the Exhaust System form the hot gas path therefore considerations shall be given as to how these components are integrated.

g) Where the Heat Transfer Media (HTM) is flammable, the Purchaser may specify if firedetection and/or extinguishing systems in the Exhaust System shall be supplied. However therequirements for such systems are not covered by this standard and shall be agreed betweenthe Purchaser and the Supplier.

Note: A bullet (●) at the beginning of a paragraph indicates that either a decision is required or furtherinformation is to be provided by the purchaser at the Tender stage.