News & View, Volume 48 | Acoustic Resonance

News & Views, Volume 48 | Acoustic Resonance

By: Mark Jaeger and Andrew CromptonNews & View, Volume 48 | Acoustic Resonance

Acoustic resonance is a phenomenon in which an acoustic system amplifies sound waves whose frequency matches one of its own natural frequencies of vibration (its resonance frequencies).

in everyday life.  In the most simple at home example, blowing air over the open end of a bottle.  Blow too hard, nothing. Blow too soft, nothing.  When done just right, the bottle produces a sound (audible vibration).  Just like that, you have acoustic resonance.  Every wind instrument in a band uses acoustic cavity resonance to produce music.  Take a piece of flexible hose, spin it in the air until it whistles, again, acoustic resonance.  When an acoustic cavity resonance happens inside piping systems, especially those with high energy flow, those seemingly harmless vibrations we illustrated above can cause serious damage.  This phenomena can occur in nearly any industry, sometimes with benign consequences and other times with catastrophic results.

 

News & View, Volume 48 | Optimizing Cathodic Protection Commitments Aging Management Program (AMP XI.M42)

News & Views, Volume 48 | Optimizing Cathodic Protection Commitments Aging Management Program (AMP XI.M42)

By: Shane McManus and Mark JaegerNews & View, Volume 48 | Optimizing Cathodic Protection Commitments Aging Management Program (AMP XI.M42)

License renewal applications (LRAs) often involve commitments to future actions.  These can be classified into one of three categories: appropriate, overcommitment, and ambiguous implementation.  Appropriate commitments include those actions that are expected by the NRC (such as those explicitly identified in the GALL(1) and GALL-SLR(2)) as well as some less restrictive actions that are technically justified by engineering evaluation.  These commitments can generally be implemented within one operating cycle using existing technology, are cost-effective, and are consistent with the GALL and GALL-SLR.

Overcommitments and those commitments with ambiguous implementations can be avoided and cost-effectiveness optimized by obtaining independent third party reviews (ITPR) of the LRA.

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News & View, Volume 44 | Data Driven Solutions for the Most Difficult Problems

News & Views, Volume 44 | Data Driven Solutions for the Most Difficult Problems

By:  Andrew Crompton and Mark Jaeger

News & View, Volume 44 | Data Driven Solutions for the Most Difficult ProblemsIn recent years, SI has observed an increasing trend in the use of specialty instrumentation to solve “impossible” problems or answer “indecipherable” questions.  This shift was particularly apparent within commercial nuclear, where data-driven solutions have long been perceived as challenging due to short outage windows, personnel dose concerns, and a significant paperwork burden, among other factors.  Widespread adoption of instrumentation-based solutions creates new paths to tackling difficult/persistent problems, and shifts the industry focus for critical assets from reactionary to more of a predictive approach.  In 2017, SI assisted numerous clients with deployment of specialty instrumentation in this fashion, comprising two general scenarios: 1) new designs/modifications, and 2) repeat failures.  Each application requires different sensors and varying analytical methods, but the approach used to leverage the resultant data to solve the problem is generically applicable throughout the energy sector.  The text below details important considerations for both scenarios and highlights a successful application of the underlying process for management of thermal fatigue in reactor coolant system branch piping.

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