Potential for boron dilution during small-break LOCAs in PWRs

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This paper documents the results of a scoping study of boron dilution and mixing phenomena during small break loss of coolant accidents (LOCAs) in pressurized water reactors (PWRs). Boron free condensate can accumulate in the cold leg loop seals when the reactor is operating in a reflux/boiler condenser mode. A problem may occur when the subsequent change in flow conditions such as loop seal clearing or re-establishment of natural circulation flow drive the diluted water in the loop seals into the reactor core without sufficient mixing with the highly borated water in the reactor downcomer and lower plenum. The resulting ... continued below

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15 p.

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Nourbakhsh, H.P. & Cheng, Z. November 1, 1995.

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Description

This paper documents the results of a scoping study of boron dilution and mixing phenomena during small break loss of coolant accidents (LOCAs) in pressurized water reactors (PWRs). Boron free condensate can accumulate in the cold leg loop seals when the reactor is operating in a reflux/boiler condenser mode. A problem may occur when the subsequent change in flow conditions such as loop seal clearing or re-establishment of natural circulation flow drive the diluted water in the loop seals into the reactor core without sufficient mixing with the highly borated water in the reactor downcomer and lower plenum. The resulting low boron concentration coolant entering the core may cause a power excursion leading to fuel failure. The mixing processes associated with a slow moving stream of diluted water through the loop seal to the core were examined in this report. A bounding evaluation of the range of boron concentration entering the core during a small break LOCA in a typical Westinghouse-designed, four-loop plant is also presented in this report.

Physical Description

15 p.

Notes

INIS; OSTI as TI96002007

Source

  • OECD/Committee on Safety of Nuclear Installations (CSNI) specialist meeting on boron dilution reactivity transients, State College, PA (United States), 18-20 Oct 1995

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  • Other: TI96002007
  • Report No.: BNL-NUREG--62261
  • Report No.: CONF-9510225--1
  • Grant Number: AC02-76CH00016
  • DOI: 10.2172/102204 | External Link
  • Office of Scientific & Technical Information Report Number: 119434
  • Archival Resource Key: ark:/67531/metadc623162

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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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  • November 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2016, 8:29 p.m.

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Nourbakhsh, H.P. & Cheng, Z. Potential for boron dilution during small-break LOCAs in PWRs, article, November 1, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc623162/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.