ENS 49238

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v t e ENS Event
14:50 Aug 5, 2013
Title	Agreement State Report - Shutter Stuck on a Process Gauge
Event Description	The State of Nebraska submitted the following information via email: The licensee uses fixed industrial gauges for measuring levels in fly ash hoppers at the station's precipitator building. The industrial fixed gauges contain a Cesium 137 sealed source. The Cesium 137 sources were originally installed in April, 1984, and at the time contained 50 millicuries per source. The sources were manufactured and installed by Kay Ray Inc. The gauge that experienced the event was Kay Ray Gauge, Housing Model #7080 and housing serial number 16784H. The source capsule manufacture was Amersham model no. CDC 800 and K-R Ref. Number serial number 15095 V. In accordance with their license conditions two of the station's chemists were securing the Unit #5's precipitator sources in preparation for an inspection of the precipitator. The 'external' source closure mechanism for Unit #5 precipitator's 5FA-3E & 4E hoppers did not operate as designed and the shutter did not close when the handle on the floor was operated. The radiation sources, which are part of a hopper level sensor, are mounted between two fly ash hoppers 20 feet off the floor. The source closure mechanisms are connected to a handle located at the floor level by a flexible cable. These closure cables are secured to the structures so that when the handles are operated the control cables slide inside a sheath. On the 5FA-3E & 4E source, the shutter closure cable became loose up at the source which allowed the whole cable to slide back and forth when the handle was operated to try and close the shutter. This type of failure has been seen in the past and is easily fixed by tightening the screw which secures the end of the cable to the structure. This required a scaffold to be built up to the source level. A contractor came on site at 12:30 pm [CDT] on 8/5/2013 and erected a scaffold so repairs could be made.

ENS 49238 +/-
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:+1.03 h0.0429 days <br />0.00613 weeks <br />0.00141 months <br />)
Opened:	Randy Lambert 15:52 Aug 5, 2013
NRC Officer:	Pete Snyder
Last Updated:	Aug 5, 2013
49238 - NRC Website
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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