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Energy Northwest reports two plant-service-water incidents at Columbia Generating Station; council told no apparent threat to public health
Summary
Energy Northwest told the Energy Facility Site Evaluation Council that a Sept. 10 compressor-fluid leak (no more than 30 gallons) and a Sept. 18 lubricating-oil release likely entered plant service water that discharges to the Columbia River; Ecology and the U.S. Coast Guard were notified and Energy Northwest said there appears to be no threat to human health or the environment.
Energy Northwest representatives told the Energy Facility Site Evaluation Council on Sept. 18, 2024, that two noncompliance incidents involving plant service water (TSW) may have resulted in small discharges to systems that can flow to the Columbia River. Council and staff were briefed on the Sept. 10 event—a leak of up to 30 gallons of silicone compressor fluid—and a separate lubricating-oil release identified Sept. 18.
Dennis Mechnagic, speaking for Energy Northwest, said the Sept. 10 incident involved a service air compressor heat exchanger that, after being removed from service for other reasons, tested positive for a leak that could allow silicone compressor fluid (Solaire 24KT) to migrate into TSW. The heat exchanger was isolated, replaced and tested.…
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