Operating Experience--Fine-Mesh Traveling Screens

by Richard S. McGinnis, Northern States Power Co, Technical, Services, Minneapolis, MN, USA,

Document Type: Proceeding Paper

Part of: Water for Resource Development


Start-up and operating results for a new screenhouse at the Prairie Island Nuclear Generating Plant, 50 miles (80 km) downstream from Minneapolis/St. Paul, are compared to design assumptions. This retrofit screenhouse, designed to exclude fish and fish larvae from the plant, handles up to 1400 cfs (40 cms) of water from the Mississippi River. Screen backwash system performance and debris loading are discussed along with head loss at various screen travel speeds. Damage to the 0. 5 mm stainless steel screens due to large debris or operator handling has been minor. Individual frames for each of the eight traveling screen bays are changed twice a year. Time commitments for screen changing, maintenance and regular operations are described.

Subject Headings: Fish and fishery management | Water intakes | Debris | Water treatment | Load factors | Maintenance and operation | Hydro power | Steam power | Mississippi River

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