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Analysis of results from a loss-of-offsite-power-initiated ATWS experiment in the LOFT Facility

Journal Article · · Am. Soc. Mech. Eng., (Pap.); (United States)
OSTI ID:6703417

An anticipated transient without scram (ATWS), initiated by loss-of-offsite power, was experimentally simulated in the Loss-of-Fluid Test (LOFT) pressurized water reactor (PWR). Primary system pressure was controlled using a scaled safety relief valve (SRV) representative of those in a commercial PWR, while reactor power was reduced by moderator reactivity feedback in a natural circulation mode. The experiment showed that reactor power decreases more rapidly when the primary pumps are tripped in a loss-of-offsite-power ATWS than in a loss-of-feedwater induced ATWS when the primary pumps are left on. During the experiment, the SRV had sufficient relief capacity to control primary system pressure. Natural circulation was effective in removing core heat at high temperature, pressure, and core power. The system transient response predicted using the RELAPS/MOD1 computer code showed good agreement with the experimental data.

Research Organization:
EG and G Idaho Inc., Idaho Falls, ID
OSTI ID:
6703417
Journal Information:
Am. Soc. Mech. Eng., (Pap.); (United States), Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Vol. 83-HT-14; ISSN ASMSA
Country of Publication:
United States
Language:
English

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