Evaluation of events involving unplanned boron dilutions in nuclear power plants. [PWR]

Technical Report · Thu Jul 01 04:00:00 EDT 1982

OSTI ID:5337299

Hagen, E W

This report reviews and evaluates events concerned with the inadvertent dilution of boron concentrations to the reactor coolant system for pressurized-water-cooled thermal reactors in commercial service. The safety concern is the unplanned addition of reactivity. The information was collected from operating experiences, licensee events reports, system designs in safety analysis reports, and regulatory documents. The results are collated and analyzed for significance and impact on power plant safety performance. Several operating experience events were selected for analysis because they meet the criteria for safety significance. However, no boron dilution incidents resulted in a reactivity excursion or transient that scrammed a unit, nor was a reactor protection system challenged by any of the events.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5337299
• Report Number(s): NUREG/CR-2798; ORNL/NSIC-208; ON: DE82019471
• Country of Publication: United States
• Language: English

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220900* -- Nuclear Reactor Technology-- Reactor Safety
CHEMICAL COMPOSITION
CONTROL
FLUID POISON CONTROL
OPERATION
PWR TYPE REACTORS
REACTIVITY
REACTIVITY INSERTIONS
REACTOR OPERATION
REACTOR SAFETY
REACTORS
SAFETY
WATER COOLED REACTORS
WATER MODERATED REACTORS