Nuclear power plants are designed to be capable of a safe shut-down in case of a large design-basis tornado or hurricane. The magnitude of the postulated design-basis tornado or hurricane is such that there is less than 1 in 10 million chance (1E-7) per year and per reactor that it would be exceeded. This probability […]
It is normal for piping systems to exhibit steady pressure pulses. Most of the time these pulses are inconsequential; however, in a few cases they must be eliminated because they can affect the reliable operation of the system or they can cause a mechanical failure. Becht Engineering recently assisted a client in the evaluation of […]
Road Map of Regulatory Requirements General Design Criteria – The protection of nuclear power plants from the effects of tornadoes (or extreme winds from typhoons or hurricanes, depending on the locality) is required through 10CFR50 Appendix A, 10 CFR 50, Appendix A, General Design Criterion 2 which requires that structures, systems, and components (SSCs) important […]
Immediately following the Fukushima accident of March 11, 2011, the US Nuclear Regulatory Commission assembled a Near-Term Task Force to gather the lessons learned from the Fukushima Dai-Ichi accident. The Task Force compiled a set of “Recommendations for Enhancing Reactor Safety in the 21st Century.” The Recommendations were approved by the Commissioner and issued for […]
This article outlines the procedure to evaluate the fitness-for-service of corroded buried pipe, and explains what CC N-806 covers … and what it does not cover. What are the Damage Mechanisms in Metallic Buried Pipe? The inspection of a buried metallic pipe, after years of service, can reveal that the pipe has little if any […]
This article describes an integrated study of thermal-hydraulic and structural loading of bounding piping systems, to establish an operating envelope, screening criteria, and rules of good design practice to protect piping systems from damage caused by valve closure water hammer. Introduction In many cases of operation or flushing of piping system, it is necessary to […]
FAILURE MODE – When an explosion (either a subsonic deflagration, or a supersonic detonation) occurs in a metallic vessel, one of three things can happen: Case 1 – Containment: The vessel can contain the explosion, elastically as if nothing happened, or with plastic bulging. Case 2 – Rupture: The vessel can rupture, without ejecting fragments. […]
Becht Engineering, Nuclear Services Division, has completed a finite-element numerical study of two proposed Code Cases for ASME III Division 1 Subsection NH, Class 1 Components in Elevated Temperature Service. They are: “Satisfaction of Strain limits for Class 1 Components at Elevated Temperature Service Using Elastic-Perfectly Plastic Analysis” and “Calculation of Creep-Fatigue for Class […]
Nonmetallic composite wrap repairs are wraps comprising two constituents: A fabric woven from a fiber such as graphite or glass A thermoset polymer such as a two-component mix epoxy resin. This material is also referred to as fiber-reinforced polymer (FRP). These repairs can be liners wrapped inside, or jackets wrapped over a corroded pipe. There […]
Providing “Best in Class” risk based fixed equipment turnaround inspection planning entails a four phase workflow process to scope, plan, execute and evergreen inspection plans to cost effectively mitigate a client’s regulatory and business risk. Becht Engineering has successfully completed piloting the, “Inspection Planners Position” to bridge gaps inherent in developing and executing inspection plans […]
