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May 2013

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From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Wed, 15 May 2013 15:46:54 +0000
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And I should tell you, this IS part of the Nuclear Industry. 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Goodyear, Patrick
Sent: Wednesday, May 15, 2013 9:50 AM
To: [log in to unmask]
Subject: Re: [TN] Trend Analysis of Repair Usage

Richard, 

The Nuclear industry tracks ALL repair parts on Class 1E (important to safety) equipment, all parts are graded Q for quality.   Some are manufacturer dedicated to specific parameters, some are purchased commercial grade and in-house selected, tested and upgraded, and some are purchased Mil-Spec.   We typically dedicate in-house electrolytic capacitors, resistors, diodes, transistors and the like.   Each part must have a traceable paper trail from mfg to end use.   If a part number does not match exactly we end up have to do an engineering evaluation and generate a repair parts equivalency.  
If we repair a trace for instance on a "Q" circuit board all of the parts used, must have been purchased class 1 and tracked by part number, amount used, location etc., even the solder has to be traceable.       

We also have a SZ-M3000 component test system made by UNITES (Czech Republic) that can batch test components much the same as a curve tracer would do for matching transistors for instance.  The M3000 covers a broad range of components, solid state, linear, relays, boards.... whatever it has software for, it is designed for a production facility that generates a product line for instance.  

We even test fuses, say you have a 10 amp 250 volt fuse that is used in a "Q" system, we have to take a representative sample, say 10/100 and blow them while plotting the current and voltage to the rated max and beyond, kind of fun to do.  

As per industry requirement I would look in the nuclear direction try 10CFR part 21.   I have a call into our parts people.  

Pat     

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Wednesday, May 15, 2013 6:53 AM
To: [log in to unmask]
Subject: [TN] Trend Analysis of Repair Usage

I am trying to find out if there is an industry requirement or recommendation that usage of Repair Procedures be tracked and monitored? I could not find any information on this in IPC-7711/7721. In previous lives the number of repair usages was tracked, and pareto was published quarterly (number of repairs used versus number of total CCAs built, number of repairs used by a given CCA part number, number of repairs associated with a given component part number, etc.) .
Because repairs are infrequent, it is not easy to detect any trend in their usage, but over time the trend analysis can provide good data to detect root causes.
I just want to know if there is any industry standard that covers this.
I am talking about repairs, not rework. If you don't know the difference please do not respond.
Thanks
dean

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