Criticality alarm system for the Lawrence Livermore National Laboratory

Technical Report · Thu Sep 01 04:00:00 EDT 1988

OSTI ID:6868665

Hill, E E; Kolar, O C

The Lawrence Livermore National Laboratory (LLNL) has specified a standard criticality alarm system (CAS) for use in all its nuclear facilities. This report describes the initial CAS as supplied from the vendor and the modifications made to develop a generic system that better suits LLNL needs. Each such system contains gamma detectors, data-acquisition modules (serviced by uninterruptable power supplies), one or more control terminals, and an emergency evacuation alarm module (also with an uninterruptable power supply). Although the primary function of the CAS is to sound an alarm in the event of a criticality accident, the system can also be used to collect dosimetry data for assessing background radiation levels, to monitor possible secondary criticalities in the event of an accident, and to monitor post-accident conditions remotely. Steps have been taken to assure that these additional functions do not compromise the primary alarm function. The present status of the new standard system, our experience with it, and future plans for other CAS components are also described in this report. 10 refs., 7 figs., 3 tabs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6868665
• Report Number(s): UCRL-53883; ON: DE89001584
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420202* -- Engineering-- Protective Structures & Equipment
ALARM SYSTEMS
BACKGROUND RADIATION
CALIBRATION
CRITICALITY
DATA
DATA ACQUISITION
DETECTION
DIAGRAMS
ENERGY SOURCES
FLOWSHEETS
FUELS
GAMMA DETECTION
INFORMATION
MATERIALS
NUCLEAR FACILITIES
NUCLEAR FUELS
NUMERICAL DATA
QUALITY ASSURANCE
RADIATION DETECTION
RADIATIONS
REACTOR MATERIALS