Study on recriticality of fuel debris during hypothetical severe accidents in the Advanced Neutron Source reactor

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A study has been performed to measure the potential of recriticality during hypothetical severe accident in Advanced Neutron Source (ANS). For the lumped debris configuration in the Reactor Coolant System (RCS), as found in the previous study, recriticality potential may be very low. However, if fuel debris is dispersed and mixed with heavy water in RCS, recriticality potential has been predicted to be substantial depending on thermal-hydraulic conditions surrounding fuel debris mixture. The recriticality potential in RCS is substantially reduced for the three element core design with 50% enrichment. Also, as observed in the previous study, strong dependencies of k{sub ... continued below

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17 p.

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Kim, S.H.; Taleyarkhan, R.P.; Georgevich, V.; Navarro-Valenti, S. & Shin, S.T. September 1, 1995.

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Description

A study has been performed to measure the potential of recriticality during hypothetical severe accident in Advanced Neutron Source (ANS). For the lumped debris configuration in the Reactor Coolant System (RCS), as found in the previous study, recriticality potential may be very low. However, if fuel debris is dispersed and mixed with heavy water in RCS, recriticality potential has been predicted to be substantial depending on thermal-hydraulic conditions surrounding fuel debris mixture. The recriticality potential in RCS is substantially reduced for the three element core design with 50% enrichment. Also, as observed in the previous study, strong dependencies of k{sub eff} on key thermal hydraulic parameters are shown. Light water contamination is shown to provide a positive reactivity, and void formation due to boiling of mixed water provides enough negative reactivity and to bring the system down to subcritical. For criticality potential in the subpile room, the lumped debris configuration does not pose a concern. Dispersed configuration in light water pool of the subpile room is also unlikely to result in criticality. However, if the debris is dispersed in the pool that is mixed with heavy water, the results indicate that a substantial potential exists for the debris to reach the criticality. However, if prompt recriticality disperses the debris completely in the subpile room pool, subsequent recriticality may be prevented since neutron leakage effects become large enough.

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17 p.

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INIS; OSTI as DE96003189

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  • Other Information: PBD: Sep 1995

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  • Other: DE96003189
  • Report No.: ORNL/TM--12947
  • Grant Number: AC05-84OR21400
  • DOI: 10.2172/161554 | External Link
  • Office of Scientific & Technical Information Report Number: 161554
  • Archival Resource Key: ark:/67531/metadc622637

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Jan. 21, 2016, 12:39 p.m.

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Kim, S.H.; Taleyarkhan, R.P.; Georgevich, V.; Navarro-Valenti, S. & Shin, S.T. Study on recriticality of fuel debris during hypothetical severe accidents in the Advanced Neutron Source reactor, report, September 1, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc622637/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.