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

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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. 5. Efficiency adjustment to incoming quality Integration of process-oriented control with systematic inspection INTRINSIC INSPECTION PERFORMANCE IMPROVEMENT EXAMPLE Optimization of enrichment deviation signal by experimental design 0,7 0,6 I I 0,5 0,4 0,3 0,1 0 S 10 15 Smoothing parameter 14 f FJ5J Lmgen, 18-22 October 1999 FIG.

1^11 i ^ ii 1| a C (]• 1 Roughness o. V Characteristics j1 '^il$S$ ^514 ^g^S . "|^jij> ! | * 1 3 0 1 3 1 0 0 1 0 0 Column Integrty 8 1 0 0 3 3 3 3 0 0 z 1 3 0 0 1 0 0 Growing 9 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Weld ng Integrity i

An analytical result is reported if both results would be within control limit. Re-analysis is carried out if there would be out of limit. Intercomparison analysis on concentration and isotope ratio of plutonium and uranium has been performed four times per a year among IAEA-SAL, NMCC-SAL of Japan and JNC from 1994. Bias of these analyses can be checked annually by the intercomparison. 3 Subject to be considered Timeliness of analysis is important from the process operation. It is necessary to dissolve the powder or pellet to analyze the sample and it takes a longer time to dissolve the MOX sample rather than UOX sample and to treat samples for IDMS.

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