Category Archives: A. Worrall

Riser

Since the iPWR steam generators are integral to the pressure vessel, an area within the vessel must be allocated for upward reactor coolant flow from the fuel assemblies to the upper tube sheet at the top of the integral steam generator(s). This area is often referred to as the riser section. It is analogous to the RCS hot leg in […]

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Wireless versus wired solutions

Wireless systems are popular in today’s high tech environment, but they will always pose a problem for a nuclear safety system. The concern for wireless safety systems is mostly security. As anyone who works with wireless systems can verify, any system that is wireless is vulnerable. It is vulnerable to jamming, it is vulnerable to hacking, and it is a […]

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Intelligent and adaptive HSIs

Although the term ‘intelligent’ is perhaps a misnomer in HSIs, it is nevertheless an important development. This is a class of technology that mimics certain aspects of human reasoning and behaviour. Such systems employ statistical and probabilistic methods in conjunction with neural networks, databases, rules and a variety of sensors to approximate human traits of reasoning, knowledge, planning, learning, communication, […]

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SMR-specific licensing and policy issues

In the US, the NRC, the nuclear industry, and other stakeholders have been collaborating and addressing potential licensing, policy and technical issues for SMR LWR designs since 2009. These issues result mainly from the key differences between the new SMR designs and current large LWR designs (such as size, moderator, coolant/ cooling systems, fuel design, and projected operational parameters). But […]

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International perspective

There are some options, however, for wider levels of international cooperation using a globalised modular approach to the build and development of small reactors. A single product that has access to a global market will need to offer routes for international offset and localisation of content and workscope. Depending on the approach to modularity throughout the plant, i. e. both […]

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Westinghouse SMR testing

In July 2013 Westinghouse completed the manufacturing and assembly of two test fuel assemblies for its SMR design (225 MWe per reactor). The fuel design for this LW-SMR is based upon Westinghouse’s Robust Fuel Assembly (RFA) technology used in existing PWRs and for the AP-1000 design. In the past, one of the failure mechanisms of concern for PWR fuel is […]

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Development of HWRs

In 1965 the government requested the CNEA to prepare a feasibility report on the construction of an NPP in the region were most of the population and industry were concentrated. The CNEA’s report showed the feasibility of installing a nuclear power plant and the Atucha site was selected.

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