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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 49199 | 17 July 2013 15:30:00 | 10 CFR 30.50(b)(2) | Moisture Gauge Shutter Stuck in Open Position | TVA's Paradise Fossil Plant uses a coal scan moisture monitor with a sealed source containing 3 millicuries of Cesium-137. The gauge is used to monitor the moisture in the coal being transferred on a common feed line to three units at Paradise Fossil Plant. On July 17, 2013 at 1030 CDT, the shutter on the moisture gauge was determined not to be operable. The shutter failed in the open position. The shutter failure discovery was made during the six month shutter test. The issue is being entered into the corrective action program. No personnel radiation exposure was received. The source is not shuttered, but the gauge is in the operating position and is in a safe condition. A twenty-four hour notification is required per 10 CFR 30.50(b)(2) due to failure of the moisture monitor shutter to close. NRC Region II Duty Officer and NRC Region I Duty Officer will be notified. Gauge model TBM-201. Licensee stated that there is no danger of personnel exposure. | ||
| ENS 47046 | 12 July 2011 18:30:00 | 10 CFR 30.50(b)(2) | Moisture Density Gauge Shutter Stuck in the Closed Position | Tennessee Valley Authority Paradise Fossil Plant uses an Ohmart Model SR1-A density gauge with a sealed source containing up to 1,562 milliCuries of Cesium 137. The gauge is used to monitor the density of the limestone slurry at the Unit 2 scrubber. On July 12, 2011 at 1330 (CDT) the shutter on the density gauge was determined to be not operable. It was determined that the shutter failed in the closed position when the operator received a slurry density high alarm. The shutter failure is in the closed and safe position. The gauge has been entered into the corrective action program and will be repaired by the manufacturer at a later time. There were no personnel exposures, no damages to other equipment, and no additional compensatory actions necessary since the shutter is failed closed/safe position. The licensee notified the R2DO (Freeman). |