Advanced Methods of Process, QC in Nuclear Fuel Mfg (IAEA

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Sample text

Define • ELABORA TION OF THE DESIGN QFD The design QFD ("Quality Function Deployment") evaluates: • The importance of Functional Requirements. (First House of Quality) • The importance of Product Characteristics. (Second House of Quality) It starts with a deployment of Functional Requirements of the fuel rod. These are: energy production, integrity (the existence of a barrier to prevent fission products to pass on the primary circuit), growth (compatibility with the fuel assembly) and traceability.

Example of intrinsic performance inspection improvement 26 Integration of process-oriented control with systematic inspection IMPROVEMENT OF INCOMING QUALITY Po Qualitative characteristics : • analysis of inspection results : examples . rod scanner: check on stability of line cleaning conditions by long term analysis of rejection frequencies . visual inspection : frequency and Pareto analysis based on classification of the defects detected during inspection Quantitative characteristics : SPC 15 FBFC MATOM Lmgen, 18 -22 October 1999 FIG.

E. "findable" causes, which can be controlled. Integration of process-oriented control with systematic inspection EFFICIENCY ADJUSTMENT TO INCOMING QUALITY Example : Rod scanner for detection of enrichment deviation (A) Specification : • minimum efficiency e0(A) • maximum outgoing defect rate p0(A) (with confidence level) Inspection : • actual efficiency e(A) > e0(A) • detected defect rate pa Final decision : • if p, = e(1-e)-1pa < Po then OK • else partial or total reinspection with e' > e F B F C_ Lmgen 18-22 October 1999 FIG.

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