Severe Accident Sequence Analysis (SASA) Program sequence event tree: boiling water reactor anticipated transient without scram

Technical Report · Sun Apr 01 00:00:00 EST 1984

OSTI ID:6925700

Bruske, S Z; Wright, R E

A sequence event tree for a boiling water reactor anticipated transient without scram (ATWS) has been developed and quantified. Goal is to provide a logical representation of the systems that must respond to an ATWS, the required operator response to the event, operator actions that could be performed in response to multiple failures, and the phenomenological concerns. Purpose of the sequence event tree is to provide a basis upon which to perform additional deterministic thermal-hydraulic and core damage analyses in the most cost effective manner based on the most likely sequence of events that will lead to containment/core damage. The ATWS sequence event tree is based on main steam isolation valve (MSIV) closure as the initiating event. The ATWS sequence event tree logic is based on three means to achieve low power or subcriticality: (a) early boron injection, (b) level control to top of active fuel and pressure control without boron injection, or (c) late boron injection that has been preceded with either level or pressure control.

• Research Organization: EG and G Idaho, Inc., Idaho Falls (USA)
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 6925700
• Report Number(s): NUREG/CR-3596; EGG-2288; ON: DE84010548
• Resource Relation: Other Information: Portions are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
ATWS
BWR TYPE REACTORS
CONTROL
DAMAGE
PROBABILITY
REACTOR CORES
REACTOR OPERATORS
ACCIDENTS
PERSONNEL
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
220900* - Nuclear Reactor Technology- Reactor Safety
210100 - Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled