Shaktitilar All devices were revised to mirror present criteria. The process is complete when all critical characteristics are verified and the item is designated for use as a basic component. Electronic books The e-book database EBC. As a side note, if rpri quality program follows NQA-1, the section for Basic Requirement 7 includes requirements for Commercial Grade Dedication which differ based on the edition followed. The first question received is: Apart from the QA manual, there are mainly two types of such documents: This is a great question because it can be very difficult to find epir for commercial grade dedication. Regrettably, indication of copyright fee is not available.
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After World War II an effort was made to better understand the shelf life of rubbers. It was made in order to summarize all the information and requirements on age control up until that point.
All of these efforts were made to keep a good rotating inventory of elastomeric goods. However, there was a reference to ASA, a different age control document.
Another document that was in play during all of this was the MIL-HDBK; this was largely part of the same effort to keep a good economy of rotating elastomeric materials. After many revisions of different documents and cancellations the newest document was approved and published by Society of Aerospace Engineers SAE , the ARP, which is now on revision D.
The actual shelf life of materials has been debated for some time and is still a topic of contention. This is because many studies have been done including EPRI NP, which stated some elastomeric materials could have an extended shelf life of 32 years. With proper storage this author has seen silicone maintain its elasticity for twenty plus years. It is our mission at NEDC to comply with all purchase order requirements, including shelf life.
This document provides a helpful list of proper ways to store elastomeric materials. Normally the shelf life of a material is certified to a shelf life because of the materials inherent properties. For example, silicone has a twenty-year shelf life. The reason for this outstanding shelf life is the natural, stable backbone of silicone, i.
There is a helpful chart below of typical shelf lives of elastomeric materials. Once again this is typical, meaning this does not always apply for any material.
Shelf Life Controls of Elastomeric Material
Background Because of the focus by utilities on producing power as efficiently as possible, the reliability of major motors in utility power plants is being examined much more carefully. In-service failures are to be avoided and when motors have to be repaired, plants want to ensure proper repair methods are applied. LEMUG has produced motor rewind specifications to ensure that plants are knowledgeable of motor repair work. Objective The objective of this study was to develop a user guide for the vacuum-pressure impregnation VPI process for medium voltage stator windings. The guide discusses the principle materials and practices used to manufacture stator windings and include material relevant to random wound stators. The goal was to provide insight into the true role of resin and processing in achieving a proper stator treatment. Final Report March
Guide for Electric Motor Stator Winding Insulation Design, Testing and VPI Resin Treatment
Conference Craig, W E ; Mulford, T J - Transactions of the American Nuclear Society; USA As nuclear power plants continue in the transition to a strictly operating and maintenance mode, the engineering involvement required to specify and procure replacement parts and components continues to increase. The evaluation process for a replacement item has one simple goal: to specify an effective set of technical and quality requirements that will result in the procurement of an item meeting the plant design basis. The evaluation process is depicted in a simplified block diagram showing the elements of engineering evaluation from a functional perspective. Utilities have taken several approaches to involve engineering in the procurement process. A common result for the approaches is the additional operations and maintenance O M cost imposed by the added resource requirements.
Vudokus It can be downloaded from the link below:. The process is complete when all critical characteristics are verified and the item is designated for use as a basic component. Guidelines for the technical evaluation of replacement items in nuclear power plants NCIG As far as the dedication process goes, the requirements for it are somewhat loose. Removed non-conforming items are returned to the Material Control quarantine area or to the shop for repair, if a repair was chosen as the method of disposition for the non-conformity. You can always perform full CGD of the items, but this guidance allows the OEM to perform an acceptance process that is appropriate based on the advantages that the OEM has in regards to controlling the drawings and commercial process and receiving additional feedback from commercial uses of the items. As a side note, if a quality program follows NQA-1, the section for Basic Requirement 7 includes requirements for Commercial Grade Dedication which differ based on the edition followed.