ENS 43344: Difference between revisions
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| event date = 04/04/2007 16:47 PDT | | event date = 04/04/2007 16:47 PDT | ||
| last update date = 05/04/2007 | | last update date = 05/04/2007 | ||
| title = 30-Day Report Involving | | title = 30-Day Report Involving a Loss of Accountability of Less than 1 Gram Snm | ||
| event text = This is a non-emergency Event Notification made in accordance with 10 CFR 20.2201(a)(1)(ii) to inform the NRC of a loss of accountability of a very small amount (e.g., particle size) of special nuclear material (SNM). As part of preparations for an NRC inspection of Columbia's SNM Control and Accounting Program (April 16-19, 2007), documentation concerning the recovery of two pieces of a broken fuel rod was obtained. The documentation revealed existence of potential fuel particles estimated to be less than 1 gram in aggregate located in the spent fuel pool. The location of these particles cannot be positively identified at this time and is therefore being reported as missing SNM under 10 CFR 20.2201(a)(1)(ii). | | event text = This is a non-emergency Event Notification made in accordance with 10 CFR 20.2201(a)(1)(ii) to inform the NRC of a loss of accountability of a very small amount (e.g., particle size) of special nuclear material (SNM). As part of preparations for an NRC inspection of Columbia's SNM Control and Accounting Program (April 16-19, 2007), documentation concerning the recovery of two pieces of a broken fuel rod was obtained. The documentation revealed existence of potential fuel particles estimated to be less than 1 gram in aggregate located in the spent fuel pool. The location of these particles cannot be positively identified at this time and is therefore being reported as missing SNM under 10 CFR 20.2201(a)(1)(ii). | ||
The particles were created during a 1990 refueling outage while inspecting a leaking fuel bundle. To identify the leaking rod, the bundle was disassembled and rod-by-rod electronic sorting performed. Ultrasonic examination identified the leaking rod; however, during the inspection the rod bent and snapped while being guided through a fuel inspection funnel. A procedure was approved and successfully executed to recover the broken rod sections. Following the recovery, an inspection was performed with an underwater camera to determine if any fuel pellets had been released as part of the evolution. No fuel pellets were identified; however, a small dark particle of material surrounded by smaller black particles was observed in a stainless steel bucket which had been positioned under the broken fuel rod pieces. It is believed that the bucket containing the particles was suspended off the west wall of the spent fuel pool, north of the work table. The location of the particles within the bucket cannot be positively identified at this time. | The particles were created during a 1990 refueling outage while inspecting a leaking fuel bundle. To identify the leaking rod, the bundle was disassembled and rod-by-rod electronic sorting performed. Ultrasonic examination identified the leaking rod; however, during the inspection the rod bent and snapped while being guided through a fuel inspection funnel. A procedure was approved and successfully executed to recover the broken rod sections. Following the recovery, an inspection was performed with an underwater camera to determine if any fuel pellets had been released as part of the evolution. No fuel pellets were identified; however, a small dark particle of material surrounded by smaller black particles was observed in a stainless steel bucket which had been positioned under the broken fuel rod pieces. It is believed that the bucket containing the particles was suspended off the west wall of the spent fuel pool, north of the work table. The location of the particles within the bucket cannot be positively identified at this time. | ||
Latest revision as of 21:16, 1 March 2018
| Where | |
|---|---|
Columbia Generating Station  Washington (NRC Region 4) | |
| Reporting | |
| 10 CFR 20.2201(a)(1)(ii) | |
| LER: | 05000397/LER-2007-002 |
| Time - Person (Reporting Time:+710.57 h29.607 days <br />4.23 weeks <br />0.973 months <br />) | |
| Opened: | Matt Hummer 14:21 May 4, 2007 |
| NRC Officer: | John Mackinnon |
| Last Updated: | May 4, 2007 |
| 43344 - NRC Website
| |