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Hinge pin and disc stud wear: additional degradation can be determined from stable flow, stroke, and leak tests. Excessive wear will degrade valve performance and may lead to leakage or failure of integral valve parts. Missing or stuck disc: the above phenomena can eventually lead to a missing or stuck disc. Such a condition can allow flow in reverse of the intended direction. This can lead to over pressurization, diversion from the intended flow path, or contamination. Similar to on-line systems portable valve diagnostics systems use state-of-the-art advanced signal conditioning electronics, but implement the monitoring through an industrial grade laptop computer for data collection, and user-friendly software to collect and analyze data on key parameters associated with the operation of an MOV.
Management is responsible for providing workers with all the things they need to succeed. Planning provides the mechanism for management to carry out its responsibility. Continually performing maintenance tasks successfully (in accordance with management's expectations) is personally rewarding and satisfying. Continual success has a strong influence in maintaining positive attitudes. • Effective planning allows workers to complete work when scheduled by eliminating process induced delays, thereby not encouraging workers to short-cuts because work time has been compressed and scheduled completion time looms.
Does the activity create a significant risk to personnel safety? The number of layers in the process will depend on individual plant, company or regulatory requirements. However, too many layers will make the process difficult to understand. One example of graduated work controls follows: Minor Maintenance Reference Package Compliance Package 41 Requirements Examples Minor Maintenance • • • • Does not require a permanent plant record Does not require a written procedure or instructions Worker expected to use appropriate resources record of work maintained in electronic database as appropriate Preventive maintenance on Balance-ofPlant equipment where there is no risk of a plant trip or transient Tighten tubing fittings Valve packing adjustments Replace annunciator cards Replace pressure indicators Reference Package • • • Record will be maintained in permanent plant files Activity does not require a written procedure or instructions Worker expected to use appropriate resources Compliance Package • Record will be maintained in permanent plant files • Activity requires a written procedure or work instructions Safety MOV limit switch adjustment Replace disc on manual valve Minor PM on safety equipment EQ elastomer replacement Replace a circuit board Reactor Protection System testing Replace a main coolant pump seal Overhaul an emergency diesel generator There are several important aspects to implementing graduated work controls: • Workers must be trained on the process and must understand when to apply increased controls when the scope of the activity changes.
Good Practices for Cost-Effective Mgmt of Nuclear Powerplants (IAEA TECDOC-928)