ENS 50780
ENS Event | |
|---|---|
14:20 Jan 30, 2015 | |
| Title | Agreement State Report - Fixed Gauge Shutter Failed to Close |
| Event Description | While attempting to close the shutter on a Kay-Ray fixed gauge at a coal fired power plant located at 24th and Craig Street in Omaha, NE, the cable operating the shutter mechanism broke. The gauge contained 50 mCi of Cs-137. Plant operators manually closed the gauge shutter. There were no exposures to workers in the area.
The state will provide additional information when it is available.
The following event update was received from the State of Nebraska via email: The Nebraska Department of Health and Human Services, Radioactive Materials Program, was notified at 1455 hours0.0168 days <br />0.404 hours <br />0.00241 weeks <br />5.536275e-4 months <br /> [CST] on 01/30/2015 by the Tech. Supervisor, at Omaha Public Power District that a Kay Ray fixed gauge Model Number 7080, housing serial number 16784Y, source shutter failed to close. The device originally installed in 1984 with approximately 50 millicuries Cesium 137 now contains approximately 25 millicuries. The gauge which is part of a hopper level sensor is mounted between two fly ash hoppers approximately 20 feet off of the floor. The source closure mechanism on the gauge is connected to a handle located at floor level by a flexible cable. The closure cable are secured so that when the floor handle is operated, the control cable slides inside of the sheath thus opening/closing the shutter. One of the station's chemists was restoring the source to service following a maintenance outage. The 'external' source closure mechanism for Unit 4 precipitator was being placed in the open position when a metallic snap was heard when opening the source shutter. The source handle was half way to the open position when this noise was heard. The operator then proceeded to check the cables function by trying to move the shutter to the closed position . The source shutter did not move. Scaffolding was erected and an inspection of the device showed the source shutter was in the open position and that the cable was not connected to the gauge operating mechanism. The source shutter mechanism was moved manually to the closed position and the cable reattached and tested several times using the remote actuator. All functions were noted to be in working condition. No personnel were unintentionally exposed to radiation during this event. Cause: Defective or Failed Part. Corrective Action Information: Equipment maintenance and repairs made without engineering change to the system. Device/Associated Equipment: Kay-Ray/Sensall/Fixed Gauge, Model Number 7080, Serial Number 16784Y. Source of Radiation: Amersham, Sealed Source Gauge, Model CDC 800, Serial Number 15112-V, with a CS-137 .025 Ci source Nebraska Item Number: NE150001 Notified the R4DO (Miller) and NMSS Events Notification via email. |
| 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:+2.18 h0.0908 days <br />0.013 weeks <br />0.00299 months <br />) | |
| Opened: | Bryan Miller 16:31 Jan 30, 2015 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Feb 5, 2015 |
| 50780 - NRC Website
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Omaha Public Power District with Agreement State | |
WEEKMONTHYEARENS 507802015-01-30T14:20:00030 January 2015 14:20:00
[Table view]Agreement State Agreement State Report - Fixed Gauge Shutter Failed to Close ENS 504932014-09-23T16:50:00023 September 2014 16:50:00 Agreement State Agreement State Report - Failure of a Process Gauge Shutter ENS 497972014-02-05T16:30:0005 February 2014 16:30:00 Agreement State Agreement State Report - Malfunctioning Source Shutter Failed to Close ENS 492382013-08-05T14:50:0005 August 2013 14:50:00 Agreement State Agreement State Report - Shutter Stuck on a Process Gauge ENS 466322011-02-20T14:30:00020 February 2011 14:30:00 Agreement State Agreement State Report - Fly Ash Gauge Shutter Failure ENS 464202010-11-15T17:30:00015 November 2010 17:30:00 Agreement State Agreement State Report - Fly Ash Density Gauge Shutter Fails Open ENS 464042010-11-08T16:15:0008 November 2010 16:15:00 Agreement State Agreement State Report - Process Gauge Shutter Could Not Be Locked Closed ENS 460582010-06-30T16:00:00030 June 2010 16:00:00 Agreement State Agreement State Report - Shutter on Fixed Industrial Gauge Failed to Close ENS 459072010-05-06T18:46:0006 May 2010 18:46:00 Agreement State Agreement State Report - Process Gauge Shutter Malfunction ENS 458012010-03-27T14:50:00027 March 2010 14:50:00 Agreement State Agreement State Report - Fixed Density Gauge Stuck Shutter ENS 457942010-03-25T16:35:00025 March 2010 16:35:00 Agreement State Process Gauge Shutter Malfunction ENS 440012008-01-29T06:00:00029 January 2008 06:00:00 Agreement State Agreement State Report - Missing Tritium Sign 2015-01-30T14:20:00 | |