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| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 50706 | 29 December 2014 20:00:00 | 10 CFR 30.50(b)(2) | Fixed Gauge Shutter Sticking When Moved | At approximately 1500 EST on December 29, 2014, an operator attempted to open the shutter on a fixed gauge Vega America source holder and determined that the shutter was sticking. The shutter was locked in the closed position and tagged out. The licensee performed a radiation survey and confirmed that the shutter was in the closed position. The licensee previously reported a stuck shutter on a nearby device (EN 50667). The licensee will contact the vendor to repair both devices. Fixed gauge: Vega America Source Holder Model SHF 2-B with Cs-137 800 millicurie source. | ||
| ENS 50667 | 10 December 2014 03:00:00 | 10 CFR 30.50(b)(2) | Fixed Gauge Shutter Stuck in Closed Position | At approximately 2200 EST, on December 09, 2014, an area operator attempted to open the shutter on source holder 10071961 (Hemlock identifier). The shutter operation failed with the shutter stuck in the closed position. The operator then contacted an area Equipment Care Operator who verified the shutter would not operate. The area operator informed a day tech of the failed shutter operation on December 10, 2014. Operating the shutter was part of a routine annual calibration PM (preventive maintenance). The process was previously shut down, therefore, this incident caused no loss of production. The source holder is located at S-457 on HP tank 35600. Fixed gauge: Vega America Source Holder Model SHF 2-B with Cs-137 800 millicurie source.
The licensee performed a radiation survey of the fixed gauge which indicated higher than expected radiation readings (40 mR/hr at <30 cm). Based on these readings, the licensee has determined that the shutter is stuck in a partially open position. The licensee has contacted the manufacturer to repair the device. Notified R3DO (Skokowski) and NMSS Events Notification (via email) |