Evaluation of BWR emergency procedure guidelines for BWR ATWS using RAMONA-3B code
An MSIV Closure ATWS calculation for a typical BWR/4 (Browns Ferry, Unit 1) was performed using the RAMONA-3B code which is a BWR systems transient code combining three-dimensional neutronic core representation with multi-channel one-dimensional thermal hydraulics. The main objective of the study was to perform a best-estimate evaluation of the recently proposed Emergency Procedure Guidelines for Anticipated Transients Without Scram (ATWS). Emphasis was placed on evaluating the effects of lowering the downcomer water level to the Top of Active Fuel (TAF) and vessel depressurization. The calculation was run up to approximately 1200 seconds. Both actions, namely, lowering the water level and vessel depressurization, lowered the reactor power to some extent. However, the pressure suppression pool water temperature still reached approximately 90/sup 0/C (potential High Pressure Coolant Injection (HPCI) pump seal failure temperature) in twenty minutes. Thus, other actions such as boron injection and/or manual control rod insertion are necessary to mitigate a BWR/4 Main Steam Isolation Valve (MSIV) closure ATWS. 19 refs., 14 figs., 3 tabs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5146509
- Report Number(s):
- BNL-NUREG-37037; CONF-851007-13; ON: TI86000630
- Country of Publication:
- United States
- Language:
- English
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ACCIDENTS
ATWS
BWR TYPE REACTORS
COMPUTERIZED SIMULATION
CONTROL EQUIPMENT
DEPRESSURIZATION
EMERGENCY PLANS
ENERGY TRANSFER
EQUIPMENT
EVALUATION
FLOW REGULATORS
FLUID MECHANICS
HEAT TRANSFER
HYDRAULICS
MECHANICS
MELTDOWN
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR CORES
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SIMULATION
VALVES
WATER COOLED REACTORS
WATER MODERATED REACTORS