Showing papers on "Blackout published in 1996"

RELAP5/MOD3 simulation of the station blackout experiment conducted at the IIST facility

Abstract: Thermal-hydraulic responses in the station blackout experiment conducted at the IIST facility are simulated through the use of the advanced system code RELAP5/MOD3. Typical behaviors occurring in the IIST station blackout transient are characterized by secondary boiloff, primary saturation and pressurization, and subsequent core uncovery and heatup. As the coolant inventory within the steam generator secondary system boils dry, the primary system pressure increases as a result of degradation of the heat removal ability of the steam generator secondary side. This pressurization phenomenon causes the pressurizer safety valve to open and the primary coolant to deplete through the valve, causing the core to eventually become uncovered. The same response can be exactly simulated by the current model. The current calculated results show fairly good agreement with the experimental data, but the timing of the events occurring in the station blackout transient is calculated earlier than the measured value. The overall comparison of key parameters between the calculated results and IIST test data, however, reveals that the current RELAP5/MOD3 model can provide rear sonable station blackout modeling for simulating longterm system behavior.

AOL blackout indicates need for reliable on-line systems

Abstract: on-line service providers to strengrlicn their systems arid male them inorc reliable. Analysts say I he blackout indicaces that AOL, did 1101 build enough redundancy into its system to wiihstaiicl the prohleiiis h a t causec! the outage. Because of this, they explain; on-l.iiie service providers inay now realize that it is crucial to have [lie typc of backup systems that many iiiiportant public senice p~wider-s, uch as telephone co~iipanics, already have. AOI,, the Uiiitecl States‘ largest on. !inc service provider, shoiilci iiave had such ~-i~di.iri.daiicy alrexiy, said Rob Eiiderle, senior industry analyst with the Giga Information Group. “There’s a lot of mission-critical aci:ivity going across their sysicni,” Enclerle sii id. “‘Iliis raisc:s sigiiificant i:eliability issues.” Hc said the AOL outage demonsti-ates thar die ol-i-line service industrywill have to face this issue very soon. Work h i llf‘,” 19 hOl1l.S 011 ALlgllSc 7 llli?)J prod

estoration Tool Using Consolidated Edison's Training Simulator

Abstract: To facilitate the implementation of restoration procedures in the event of a blackout, Consolidated Edison is considering the implementation of a knowledge-based restoration tool. This tool would not only guide operators through the execution of predefined procedures, but would also have the ability to adapt and modify these procedures if needed. These requirements can be met if the tool is built on top of a model of the power system and if it decomposes the procedure into components with an explicit or easily identifiable purpose. This tool has been developed and integrated with ConEd's Operator Training Simulator so that it can be used to train the operators in the restoration procedures. After evaluation it may be enhanced to become an on-line tool for use during an actual restoration.