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Extra resources for Advanced Methods of Process, QC in Nuclear Fuel Mfg (IAEA TECDOC-1166)

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I Process 1 control Energy Width <•-•-••--••- fl Penetration Width | Ratio Ratio CONTROL CHARTS 18 m FBFC Lmgen 18-22 October 1999 FIG. 8. Laser welding of fuel rods - an example of integration of process control with systematic inspection 28 9. CONCLUSION 100% inspection is a typical tool of the traditional quality control approach. Statistical Process Control (SPC) is the main tool of the modern approach. In fact, both approaches are complementary because they are remedies for distinct causes of process and product changes, and should not be used one in place of the other : application of 100% inspection to correct a product obtained with a process out of control, or application of sampling techniques not adapted to the frequency and gravity of quality troubles and to the high reliability objectives.

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. Almost 3or 4 days are necessary to obtain the results of analysis. For process control it is desirable to supply the results of analysis to operation section timely. Introduction or establishment of rapid analysis method should be considered for MOX fabrication.

1. Purpose of Visual inspection In the inspection of surface appearance, it is certified that there is no defect on the product, such as harmful scratch. It is necessary in quality control scheme that the inspection of surface appearance is carried out for all products, not for some samples randomly selected, basically. The visual inspection is sensuous test by comparing with the standard or limit model and the judgement of pass or fail on the product is carried out by inspector. Inspection by Japanese government is carried out finally after the inspection by reactor establisher is completed.

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Advanced Methods of Process, QC in Nuclear Fuel Mfg (IAEA TECDOC-1166)


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