Category Archives: NUCLEAR REACTOR ENGINEERING

Types of Passive Systems

15.11. Passive systems based on light-water core designs benefit from the considerable design and operating experience of existing reactors and therefore are attractive to utilities. A PWR design, designated as AP600, has been developed by Westinghouse Electric Corp. in cooperation with the U. S. Department of Energy (DOE) and EPRI. Similarly, a 600-MW(el) BWR, known as the SBWR, has been […]

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Equipment Modification and Personnel Training

12.205. The role of these elements is clear. As a result of extensive studies and strategy development, some equipment modifications may ap­pear desirable. For example, one study showed that the addition of one or more high-pressure ECCS pumps reduces the core melt probability. Also, once management strategies have been developed, operating per­sonnel need to be trained in their use.

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The Evolutionary CANDU 3

13.63. An evolutionary CANDU-type reactor system is being developed to be competitive in the international market with other medium-sized advanced concepts. This system, designated CANDU 3, is a 450-MW(el) plant that features a standardized design and numerous design features intended to achieve a short construction schedule. Prefabricated modules are extensively employed. The basic design is similar to that of the […]

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Nuclear Steam Supply System

15.43. The reactor core, pressure vessel, and steam generator arrange­ment is shown in Fig. 15.4. Major design specifications are summarized in Table 15.3. In the vessel, the helium coolant flows downward through the core, where it is heated to an average temperature of 687°C, then flows through an inner portion of a coaxial cross duct to the steam generator. The […]

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Expert Systems Development

14.36. The electric utility industry has recognized that there is a need for developing, testing, and applying expert systems. Quality assurance is a consideration since whenever subjective opinions are included in a knowl­edge base, the matter of confidence levels needs to be addressed. To meet a variety of needs, the Electric Power Research Institute established in 1989 the Knowledge-Based Technology […]

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Core and Vessel

13.32. The internal structure of a typical BWR core and reactor vessel is depicted in Fig. 13.9. The core consists of almost 800 fuel assemblies in square 8×8 arrays; 62 fuel rods are contained in each assembly with two hollow central (“water”) rods designed so that water flows through them to provide additional moderation (§10.52). Each fuel assembly is contained […]

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Passive Features

15.17. The passive features center on the operation of the safety injec­tion systems and provisions for removing core decay heat. Passive systems are defined as those which are self-contained or self-supported. To perform their safety functions, they rely on gravity, as in natural circulation cooling, or stored energy, such as that in compressed gases. Emergency electrical needs must be met […]

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