The probability of containment failure by direct containment heating in surry

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Description

In a light-water reactor core melt accident, if the reactor pressure vessel (RPV) fails while the reactor coolant system (RCS) at high pressure, the expulsion of molten core debris may pressurize the reactor containment building (RCB) beyond its failure pressure. A failure in the bottom head of the RPV, followed by melt expulsion and blowdown of the RCS, will entrain molten core debris in the high-velocity steam blowdown gas. This chain of events is called a high-pressure melt ejection (HPME). Four mechanisms may cause a rapid increase in pressure and temperature in the reactor containment: (1) blowdown of the RCS, ... continued below

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Medium: P; Size: 268 p.

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Pilch, M. M.; Allen, M. D.; Bergeron, K. D.; Tadios, E. L.; Stamps, D. W.; Spencer, B. W. et al. May 1995.

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Description

In a light-water reactor core melt accident, if the reactor pressure vessel (RPV) fails while the reactor coolant system (RCS) at high pressure, the expulsion of molten core debris may pressurize the reactor containment building (RCB) beyond its failure pressure. A failure in the bottom head of the RPV, followed by melt expulsion and blowdown of the RCS, will entrain molten core debris in the high-velocity steam blowdown gas. This chain of events is called a high-pressure melt ejection (HPME). Four mechanisms may cause a rapid increase in pressure and temperature in the reactor containment: (1) blowdown of the RCS, (2) efficient debris-to-gas heat transfer, (3) exothermic metal-steam and metal-oxygen reactions, and (4) hydrogen combustion. These processes, which lead to increased loads on the containment building, are collectively referred to as direct containment heating (DCH). It is necessary to understand factors that enhance or mitigate DCH because the pressure load imposed on the RCB may lead to early failure of the containment.

Physical Description

Medium: P; Size: 268 p.

Notes

INIS; OSTI as TI95012121

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  • Other Information: PBD: May 1995

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  • Other: TI95012121
  • Report No.: NUREG/CR--6109
  • Report No.: SAND--93-2078
  • Grant Number: AC04-94AL85000;AC07-94ID13223;W-31109-ENG-38
  • DOI: 10.2172/67788 | External Link
  • Office of Scientific & Technical Information Report Number: 67788
  • Archival Resource Key: ark:/67531/metadc704537

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  • May 1995

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 8, 2016, 12:19 p.m.

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Pilch, M. M.; Allen, M. D.; Bergeron, K. D.; Tadios, E. L.; Stamps, D. W.; Spencer, B. W. et al. The probability of containment failure by direct containment heating in surry, report, May 1995; United States. (digital.library.unt.edu/ark:/67531/metadc704537/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.