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Uf_per-Bound conJit,,uratirm. This depicted an uppcr-I_ourld thermal challenge to the vessel. A layer of porc_us debris was assumed tt_ settle onto the lower head. The interstices bclween the debris particles were assumed to be filled with molten control rod and/or ochrestructural materials, resulting in a ctmsolidated (zero porosity) layer of metallic/ceramic rn;_teri;_ladjacent to the vessel. This layer transmitted heat to the vessel more r;_pidly than the cen_naic material. A p¢_rt_usdebris bed was assumed to be supported ¢ul the I'rt_zen upper crust of the cons_)lidated region.

Because 0["uncertainties regarding the heat transfer properties between the debris and vessel w;lll, three possible debris states were considered" i. 2. 3. Uf_per-Bound conJit,,uratirm. This depicted an uppcr-I_ourld thermal challenge to the vessel. A layer of porc_us debris was assumed tt_ settle onto the lower head. The interstices bclween the debris particles were assumed to be filled with molten control rod and/or ochrestructural materials, resulting in a ctmsolidated (zero porosity) layer of metallic/ceramic rn;_teri;_ladjacent to the vessel.

Rcl¢_c_ting m¢_lten material, such as c,,_rium ¢_r in the early stages ¢_1" a scvcrc accident, n_ctals, c;_n fall t¢_the bottc)rn c_l"the vessel and may ultlm;_tcly lead t¢_its failure. The t'ailurc can bc brt_ught ;_l-_c_ut by =_nactive erosion prc_cess _1'the relocating material in the l'c_rna¢_1" a jet c_r hy localized heating (_t'the vessel l'r¢_mthe mass t_l"r¢loc;_ted material. Several exl_eriments and analyst-s have hccn pertk_rmcd t_ determine the breakup c_l'the jet material by a lluid and the cr¢_si¢_nc_r ;_hl;=li¢_nr;_t¢ ¢_t"a mt_ltcn jet ¢_nthe s¢_lidvessel wall.

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