Mentoring Nuclear Power Plant Engineers

As the Nuclear Power Plant workforce continues to age, it is imperative that nuclear plant supervisors and managers use as many tools as possible to mentor younger engineers. This article discusses several ways proven to be successful in mentoring younger engineers as a means of filling the voids created by the retirements of senior workforce […]

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The Meaning of the Class 1 Nuclear Piping Equations in NB-3650

Below we review the meaning of the six Class 1 piping stress equations in ASME III NB-3650, Class 1. The nomenclature is found in NB-3650. Two things must be kept in mind when applying these Class 1 piping equations: All the stresses are elastically calculated, i.e. the calculation model considers the material to be such […]

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Evolution of Pipe Stress Equations in the ASME Nuclear Codes (and where we are today)

The Pre-1955 Era Until 1955, the ASME Boiler and Pressure Vessel Codes, and the ASME B31 Pressure Piping code provided rules of good design practice with quantitative criteria for pressure design.  For example, quoting from ASME VIII Rules for the Construction of Unfired Pressure Vessels Section VIII A. S. M. E. Boiler Construction Code, 1927: […]

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Evaluation of Corroded Pipe in Accordance with ASME B&PV Code Section XI – A Comparison of the Three Code Cases

The evaluation of wall thinning corrosion in steel pipes is addressed in three ASME XI code cases: N-513, N-597, and N-806. I have no ambition here other than to summarize in a table the differences between these three code cases. A brief commentary follows the table. The brief commentary… Line A – While these are […]

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Repair of Pressure Equipment and Piping in Nuclear Power Plants- Navigating ASME XI Repairs with PCC-2 as a Roadmap

Download/View as PDF Summary – This article assists engineers in selecting ASME XI options for the repair of ASME III nuclear components. In summary, the repair options in ASME XI are dispersed throughout Section XI and Code Cases, while, in contrast, the ASME PCC-2 repair standard (for non-safety related components) lists repair options in a […]

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Environmentally-Assisted Fatigue (EAF) in Nuclear Power Plants

Before we tackle environmentally-assisted fatigue (EAF), what is fatigue? In ASME Boiler & Pressure Vessel Section III Division 1, Subsection NB (in short, ASME III NB) fatigue refers to the damage caused by systems and components as a result of cyclic loads. The qualification of the primary coolant system of light water reactors (ASME III […]

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Equipment Nozzle Loads

by Greg Hollinger and George Antaki One of the qualification requirements for a piping system is to keep the loads imparted by the piping on equipment nozzles within certain allowable limits. These loads consist of sets of three forces and three moments, for the various load combinations. There are basically two types of nozzle load limits: […]

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Resolution of Chronic Cooling Tower Fan Vibrations

Traditional rotating equipment mounted at grade use the mass of a foundation and grout to reduce vibration and provide support and stiffness. However, cooling tower fans must be elevated many feet above a basin of water which sometimes puts them “out of sight and out of mind”. Cost and practicality prohibits concrete and grout, thus […]

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Reduced Toughness Properties of Some Modern Carbon Steels Create Brittle Fracture Risk

Changes in steelmaking practice are reported to be causing some carbon steel piping components that are assumed by ASME Codes to behave in a ductile manner at ambient temperatures, to behave instead in a brittle manner.  Barry Messer from Fluor made a presentation on this subject at the Spring 2016 meeting of the ASME B31.3, […]

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