Category Archives: A. Worrall

HSI technology classification

There are many different ways to classify HSI technology, depending on the context, as described before. The terms ‘human-system interface’ and ‘human-system interaction’ both suggest that either a technology-centric or a human-centric classification would be possible. This section provides a simple taxonomy that describes both perspectives.

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Benefits of ALM

The ALM process can provide a number of advantages, both business and technical, over traditional manufacturing methods. The justification for considering ALM arises from the volume of the market. For a small reactor with product lifespans of 40 to 60 years it is clear that no single supply chain can support the surge of production volumes at product launch and […]

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System security

System security refers to vulnerability to physical and cyber attacks, including vulnerability of both the installed facility and the supply chain (equipment feedstock). An integrated energy system based on domestically secure natural resources would be preferred over one having external dependencies due to the associated risk factors.

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Development and testing of materials, fuels, and fabrication techniques

At the present time, the focus of this ART research area is on conducting basic R&D on new materials to enable the ultimate deployment of innovative A-SMR designs. It is aimed at addressing key long-term design needs for application of advanced materials. High-temperature design methodology is an enabling reactor technology for most A-SMR concepts. Removal of unnecessary conservatism in design […]

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Severe accident mitigation system (SAMS)

The function of the severe accident mitigation system (SAMS) is to prevent the egress of molten corium resulting from a severe accident out of the containment. This egress of corium can be avoided due to the design characteristics of the reactor cavity and containment together with the operation of the safety systems. A small air gap under the RPV is […]

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Steam generator(s) and tube sheets

Current large PWRs utilize two to four separate large steam generators; one in each coolant loop. These steam generators are either U-tube or once-through type heat exchangers. In either case, the higher pressure primary water flows inside the steam generator tubes and the lower pressure secondary fluid is outside the tubes. In the U-tube steam generator design, dry slightly saturated […]

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Human-system interfaces (HSIs) in small modular reactors (SMRs)

J. Hugo Idaho National Laboratory, Idaho Falls, ID, USA 7.1 Introduction Current and emerging nuclear power plant (NPP) design strategies include ambitious goals of reliability and safety. It is expected that these goals would be met partly by judicious implementation of new materials, new technologies and new concepts of operations. The general consensus is that current levels of safety could […]

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