Plant and Operator Response to an Extraction Steam Line Rupture — Oconee Unit 2 — June 28, 1982
The rupture of an extraction steam line at Oconee Unit 2 presented an unusual, significant challenge to the reactor operators. The operators responded quickly and correctly to the abnormal conditions and controlled the plant within nominal post-trip bounds. When the 24 inch line ruptured, the integrated control system responded to indicated conditions by increasing reactor power and feedwater flow. The operators observed increasing power and low main steam pressure indications and terminated the blowdown by tripping the reactor nine seconds after the rupture. As the location of the secondary system rupture was unknown, the operators initiated the Steam Line Break emergency procedure. Plant conditions were quickly stabilized, and did not deviate significantly from normal post-trip response. An orderly cooldown was then inititated to begin repairs.
KeywordsSteam Generator Steam Pressure Steam Line Main Steam Steam Supply
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