Mitigation of internally initiated severe accidents for a BWR Mark-II power plant

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A probabilistic risk assessment and consequence analysis for a BWR with a Mark-II containment design has shown that overpressurization is the dominant containment failure mode for a wide range of potential core meltdown accidents. This failure mode is a major contributor to the predicted off-site health consequences. Mitigation of this failure mode is aimed at maintaining the containment integrity by using a wetwell venting system and a drywell spray system. Detailed analyses with the MARCH 2 code were used to determine the effectiveness of the mitigating features. The results show that the wetwell venting system is capable of preventing overpressurization ... continued below

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Pages: 12

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Yang, J.W. & Pratt, W.T. January 1, 1985.

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Description

A probabilistic risk assessment and consequence analysis for a BWR with a Mark-II containment design has shown that overpressurization is the dominant containment failure mode for a wide range of potential core meltdown accidents. This failure mode is a major contributor to the predicted off-site health consequences. Mitigation of this failure mode is aimed at maintaining the containment integrity by using a wetwell venting system and a drywell spray system. Detailed analyses with the MARCH 2 code were used to determine the effectiveness of the mitigating features. The results show that the wetwell venting system is capable of preventing overpressurization in the containment and the drywell spray system is needed to reduce the corium/concrete interactions. However, additional mitigating systems are required for long-term cooling of the corium and ultimate removal of the decay heat for the ATWS case.

Physical Description

Pages: 12

Notes

NTIS, PC A02/MF A01; 1 - GPO.

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  • International ANS/ENS topical meeting on probabilistic safety methods and applications, San Francisco, CA, USA, 24 Feb 1985

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  • Other: TI86007125
  • Report No.: BNL-NUREG-37678
  • Report No.: CONF-850206-36
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 5983450
  • Archival Resource Key: ark:/67531/metadc1095392

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • January 1, 1985

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 24, 2018, 3:24 p.m.

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Yang, J.W. & Pratt, W.T. Mitigation of internally initiated severe accidents for a BWR Mark-II power plant, article, January 1, 1985; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1095392/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.