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Extra resources for Advanced Nuclear Plant Options - to Cope w. Extl Events (IAEA TECDOC-1487)

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There is no change in per year probabilities of exceedence as a design basis if the facility is designed to operate 10 or 60 years. 8. e. loads during low probability transients and normal operation, additional loads during anticipated operational conditions and loads during accident conditions. The safety margins or load factors are not specified, but reference is made to design codes. 5]). g. seismic, or not. A vast number of load combinations could in theory be required, but a common objective is to determine the minimum cut-set necessary employing envelope loading conditions, which govern design.

The design philosophy adopted for several advanced reactor designs, including those addressed in this section, appear to be close to the directions indicated in this Table (refer to Tables 5, 6, 7, 8, 9 and 11). 4. Emergency planning issues for advanced reactors Most of the NPPs with innovative reactors aim to eliminate the need for intervention in public domain (outside the plant boundary) through the use of enhanced passive safety features in their design. Many of these designs also aim to take advantage of the advanced safety characteristics to seek exemption from maintaining a large exclusion distance around the nuclear power plants.

Datasheet for presentation of design approaches On the basis of an analysis of information made available by the designers of advanced reactors, a common structure of a datasheet was formulated for the presentation of design approaches, including those used for dealing with external events. This structure is given in Table 2. TABLE 2. STRUCTURE OF A DATASHEET FOR PRESENTATION OF DESIGN APPROACHES USED IN ADVANCED REACTORS TO ENHANCE DEFENCE-IN-DEPTH IN GENERAL AND ADDRESS EXTERNAL EVENTS IN PARTICULAR # TITLE OF THE ITEM IN THE DATASHEET 1 List of postulated external events 2 Protection by structural design of buildings, containing structures, systems and components important to safety, against postulated extreme external events 3 Spatial separation of redundant safety related systems to secure protection against localized adverse effects, including those resulting from external events 4 Design features, implemented within protected buildings, to maintain fuel temperature within acceptance limits under postulated extreme external events when all sources of power, cooling water supply, and compressed air external to the protected building are assumed to be lost, and no credit is given to operator actions within a stipulated grace period.

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Advanced Nuclear Plant Options - to Cope w. Extl Events (IAEA TECDOC-1487)


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