Primary system fission product release and transport : a by A L Wright; Oak Ridge National Laboratory.; U.S. Nuclear

By A L Wright; Oak Ridge National Laboratory.; U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Systems Research.; et al

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By A L Wright; Oak Ridge National Laboratory.; U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Systems Research.; et al

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Extra info for Primary system fission product release and transport : a state-of-the-art report to the Committee on the Safety of Nuclear Installations

Sample text

Sequence frequencies provide perspective for the reader on the relative likelihood of various sequence types and the fact that any core damage sequence is very unlikely. injection systems are inoperable due to the lack of ac power, core damage will result. Because the scope of this state-of-the-art assessmentis confined to the RCS, only accident sequence conditions up to the RCS boundary are considered. Thus, ex-vessel debris coolability, core concrete interaction, and containment thermal-hydraulic conditions are not addressed.

The ambientatmmpherewithin the RCS can also affect fission productrevaporiT___tion. Design featuresof theplant, such as reactorcavity flooding, can reducethe extent of this effect. Naturalcirculationhasbeen identified as an im_t phenomenonin PWRs, particularlywhen the RCSpressure is high. l The two main effects of naturalcirculation areenhancing heattransferfromthe core regionto other structuresin the RCS andenhancingsteam flow in the core, thus holdingdown cote temperaturesand delaying melt progression.

Ruthenium would be in metallic form. Metallic ruthenium has low vapor pressure and tends to alloy itself with other metals,so its release nmgnitude would also tend to be small, Local variations of oxygen potential are possible and could result in increased rates of release of strontium, cerium, and other low volatiles. Such increases are, however, expected to be of short duration relative to the time of core damageprogression and therefore to be of minor im_ to tom, release magnitude. and Tramport Implications Details of fission woduct release and transport ate found in Chaps.

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