ENS 46058

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v t e ENS Event
16:00 Jun 30, 2010
Title	Agreement State Report - Shutter on Fixed Industrial Gauge Failed to Close
Event Description	The following report was received via fax from the State of Nebraska: The licensee uses fixed industrial gauges for measuring densities in flyash hoppers at the Stations precipitator building. The Industrial gauges contain a Cesium 137 sealed source. The Cesium 137 sources were originally installed in 1984 and at the time contained 50 millicuries per source. The sources were manufactured and installed by Kay Ray Inc. The gauge housing Model No. is 7080. The licensee was performing the semi-annual 'Shutter Function Test' on Unit #4's precipitator sources. The 'external' source closure mechanism for the 4FA-1B & 2B hoppers did not operate as designed and the shutter did not close when the handle on the floor was operated. The external closure cable had detached from the cable clamp on the side of the hopper. In this condition, when the shutter closure mechanism was moved, the cable that operates the source shutter mechanism 20 feet above the floor, bent instead of sliding the cable to the closed position. No personnel were exposed to radiation during this event. This was the fourth similar event at the licensee's plant (March 25, 27, May 6, & June 30, 2010). On June 17, a NE DHHS (Nebraska Department of Health and Human Services), Radioactive Material inspector performed a follow-up investigation on-site. At this plant, OPPD (Omaha Public Power District) has 58 installed operating nuclear fixed gauges. At the time of the investigation, OPPD had replaced 20 of the old shutter cables with a new redesigned direct replacement cable. OPPD plans to replace all of the 58 shutter cables when they fail to operate or as time permits.

ENS 46058 +/-
Where
Omaha Public Power District Omaha, Nebraska (NRC Region 4)
License number:	01-39-04
Organization:	Ne Div Of Radioactive Materials
Reporting

Agreement State
Time - Person (Reporting Time:+0.07 h0.00292 days <br />4.166667e-4 weeks <br />9.5886e-5 months <br />)
Opened:	Randy Lambert 16:04 Jun 30, 2010
NRC Officer:	John Knoke
Last Updated:	Jun 30, 2010
46058 - NRC Website Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
Omaha Public Power District with Agreement State
WEEKMONTHYEAR2015-01-30T14:20:00 [Table view]
[ENS list for Omaha Public Power District]

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