Results of EPRI/ANL DCH investigations and model development
The results of a series of five experiments are described addressing the severity and mitigation of direct containment heating. The tests were performed in a 1:30 linear scale mockup of the Zion PWR containment system using a reactor-material corium melt consisting of 60% UO/sub 2/, 16% ZrO/sub 2/,...
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ftosti:oai:osti.gov:6519463 2023-07-30T04:07:10+02:00 Results of EPRI/ANL DCH investigations and model development Spencer, B.W. Sienicki, J.J. Sehgal, B.R. Merilo, M. 2008-09-04 application/pdf http://www.osti.gov/servlets/purl/6519463 https://www.osti.gov/biblio/6519463 unknown http://www.osti.gov/servlets/purl/6519463 https://www.osti.gov/biblio/6519463 22 GENERAL STUDIES OF NUCLEAR REACTORS 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS ZION-1 REACTOR SCALE MODELS ZION-2 REACTOR BLOWDOWN C CODES CHEMICAL REACTIONS CONTAINMENT CORIUM H CODES HEAT TRANSFER HEATING HYDRAULICS HYDROGEN LOSS OF COOLANT M CODES OXIDATION REACTOR SAFETY S CODES TESTING WATER ACCIDENTS COMPUTER CODES ELEMENTS ENERGY TRANSFER ENRICHED URANIUM REACTORS FLUID MECHANICS HYDROGEN COMPOUNDS MECHANICS NONMETALS OXYGEN COMPOUNDS POWER REACTORS PWR TYPE REACTORS REACTOR ACCIDENTS REACTORS SAFETY STRUCTURAL MODELS THERMAL REACTORS WATER COOLED REACTORS WATER MODERATED REACTORS 2008 ftosti 2023-07-11T10:49:13Z The results of a series of five experiments are described addressing the severity and mitigation of direct containment heating. The tests were performed in a 1:30 linear scale mockup of the Zion PWR containment system using a reactor-material corium melt consisting of 60% UO/sub 2/, 16% ZrO/sub 2/, 24% SSt at nominally 2800C initial temperature. A ''worst-case'' type test involving unimpeded corium dispersal through an air atmosphere in a closed vessel produced an atmosphere heatup of 323K, equivalent to a DCH efficiency of 62%. With the addition of structural features which impeded the corium dispersal, representative of dispersal pathway features at Zion, the DCH efficiency was reduced to 1--5%. (This important result is scale dependent and requires larger scale tests such as the SURTSEY program at SNL plus mechanistic modeling for application to the reactor system.) With the addition of water in the cavity region, there was no measurable heatup of the atmosphere. This was attributable to the vigorous codispersal of water with corium which prevented the temperature of the atmosphere from significantly exceeding T/sub sat/. In this case the DCH load was replaced by the more benign ''steam spike'' from corium quench. Significant oxidation of the corium constituents occurred in the tests, adding chemical energy to the system and producing hydrogen. Overall, the results suggest that with consideration of realistic, plant specific, mitigating features, DCH may be no worse and possibly far less severe than the previously examined steam spike. Implications for accident management are addressed. 17 refs., 7 figs., 4 tabs. Other/Unknown Material Surtsey SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Surtsey ENVELOPE(-20.608,-20.608,63.301,63.301) |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
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22 GENERAL STUDIES OF NUCLEAR REACTORS 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS ZION-1 REACTOR SCALE MODELS ZION-2 REACTOR BLOWDOWN C CODES CHEMICAL REACTIONS CONTAINMENT CORIUM H CODES HEAT TRANSFER HEATING HYDRAULICS HYDROGEN LOSS OF COOLANT M CODES OXIDATION REACTOR SAFETY S CODES TESTING WATER ACCIDENTS COMPUTER CODES ELEMENTS ENERGY TRANSFER ENRICHED URANIUM REACTORS FLUID MECHANICS HYDROGEN COMPOUNDS MECHANICS NONMETALS OXYGEN COMPOUNDS POWER REACTORS PWR TYPE REACTORS REACTOR ACCIDENTS REACTORS SAFETY STRUCTURAL MODELS THERMAL REACTORS WATER COOLED REACTORS WATER MODERATED REACTORS |
spellingShingle |
22 GENERAL STUDIES OF NUCLEAR REACTORS 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS ZION-1 REACTOR SCALE MODELS ZION-2 REACTOR BLOWDOWN C CODES CHEMICAL REACTIONS CONTAINMENT CORIUM H CODES HEAT TRANSFER HEATING HYDRAULICS HYDROGEN LOSS OF COOLANT M CODES OXIDATION REACTOR SAFETY S CODES TESTING WATER ACCIDENTS COMPUTER CODES ELEMENTS ENERGY TRANSFER ENRICHED URANIUM REACTORS FLUID MECHANICS HYDROGEN COMPOUNDS MECHANICS NONMETALS OXYGEN COMPOUNDS POWER REACTORS PWR TYPE REACTORS REACTOR ACCIDENTS REACTORS SAFETY STRUCTURAL MODELS THERMAL REACTORS WATER COOLED REACTORS WATER MODERATED REACTORS Spencer, B.W. Sienicki, J.J. Sehgal, B.R. Merilo, M. Results of EPRI/ANL DCH investigations and model development |
topic_facet |
22 GENERAL STUDIES OF NUCLEAR REACTORS 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS ZION-1 REACTOR SCALE MODELS ZION-2 REACTOR BLOWDOWN C CODES CHEMICAL REACTIONS CONTAINMENT CORIUM H CODES HEAT TRANSFER HEATING HYDRAULICS HYDROGEN LOSS OF COOLANT M CODES OXIDATION REACTOR SAFETY S CODES TESTING WATER ACCIDENTS COMPUTER CODES ELEMENTS ENERGY TRANSFER ENRICHED URANIUM REACTORS FLUID MECHANICS HYDROGEN COMPOUNDS MECHANICS NONMETALS OXYGEN COMPOUNDS POWER REACTORS PWR TYPE REACTORS REACTOR ACCIDENTS REACTORS SAFETY STRUCTURAL MODELS THERMAL REACTORS WATER COOLED REACTORS WATER MODERATED REACTORS |
description |
The results of a series of five experiments are described addressing the severity and mitigation of direct containment heating. The tests were performed in a 1:30 linear scale mockup of the Zion PWR containment system using a reactor-material corium melt consisting of 60% UO/sub 2/, 16% ZrO/sub 2/, 24% SSt at nominally 2800C initial temperature. A ''worst-case'' type test involving unimpeded corium dispersal through an air atmosphere in a closed vessel produced an atmosphere heatup of 323K, equivalent to a DCH efficiency of 62%. With the addition of structural features which impeded the corium dispersal, representative of dispersal pathway features at Zion, the DCH efficiency was reduced to 1--5%. (This important result is scale dependent and requires larger scale tests such as the SURTSEY program at SNL plus mechanistic modeling for application to the reactor system.) With the addition of water in the cavity region, there was no measurable heatup of the atmosphere. This was attributable to the vigorous codispersal of water with corium which prevented the temperature of the atmosphere from significantly exceeding T/sub sat/. In this case the DCH load was replaced by the more benign ''steam spike'' from corium quench. Significant oxidation of the corium constituents occurred in the tests, adding chemical energy to the system and producing hydrogen. Overall, the results suggest that with consideration of realistic, plant specific, mitigating features, DCH may be no worse and possibly far less severe than the previously examined steam spike. Implications for accident management are addressed. 17 refs., 7 figs., 4 tabs. |
author |
Spencer, B.W. Sienicki, J.J. Sehgal, B.R. Merilo, M. |
author_facet |
Spencer, B.W. Sienicki, J.J. Sehgal, B.R. Merilo, M. |
author_sort |
Spencer, B.W. |
title |
Results of EPRI/ANL DCH investigations and model development |
title_short |
Results of EPRI/ANL DCH investigations and model development |
title_full |
Results of EPRI/ANL DCH investigations and model development |
title_fullStr |
Results of EPRI/ANL DCH investigations and model development |
title_full_unstemmed |
Results of EPRI/ANL DCH investigations and model development |
title_sort |
results of epri/anl dch investigations and model development |
publishDate |
2008 |
url |
http://www.osti.gov/servlets/purl/6519463 https://www.osti.gov/biblio/6519463 |
long_lat |
ENVELOPE(-20.608,-20.608,63.301,63.301) |
geographic |
Surtsey |
geographic_facet |
Surtsey |
genre |
Surtsey |
genre_facet |
Surtsey |
op_relation |
http://www.osti.gov/servlets/purl/6519463 https://www.osti.gov/biblio/6519463 |
_version_ |
1772820315658780672 |