Next Generation Nuclear Plant Phenomena Identification and Ranking Tables (PIRTs) Volume 5: Graphite PIRTs

Abstract

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Pore structure development in oxidized IG-110 nuclear graphite

“…Since chronic oxidation during normal operating conditions because of exposure to oxidizing impurities in the coolant and acute corrosion under airingress accidents will degrade the mechanical property of graphite materials, one of the main safety subjects in the reactor design is understanding of the oxidation damage of nuclear graphite at high temperatures [1].…”

Results of a Phenomena Identification and Ranking Table (Pirt) Exercise for a Severe Accident in a Small Modular High-Temperature Gas-Cooled Reactor

“…Examples include the PIRTs published by Oak Ridge National Laboratory [33,[36][37][38][39][40], the U.S. Nuclear Regulatory Commission [41], Argonne National Laboratory [42], and Idaho National Laboratory [43]. These past PIRTs did not address the limiting accident scenario of interest in this PIRT exercise (Section 3.2).…”

Validation of Wichner Predictive Model for Chronic Oxidation by Moisture of Nuclear Graphite

“…Assume a semi-infinite slab with face at x = 0 exposed to an oxidant in concentration U (mol/m 3 where A and B were defined earlier by Eqs. (6) and (8).…”