ENS 40124
ENS Event | |
|---|---|
01:45 Sep 2, 2003 | |
| Title | Manual Actuation of Safety Equipment for Autoclave Containment |
| Event Description | On 09/01/03 Operations Personnel were preparing to disconnect a UF6 cylinder from Autoclave #1 in the X-344 facility. The UF6 cylinder as in the 9 O' Clock position and was being prepared to roll to the 12 O' Clock position to complete disconnecting the cylinder safety valve and pigtail from the cylinder. At approximately 2135 hours0.0247 days <br />0.593 hours <br />0.00353 weeks <br />8.123675e-4 months <br /> UF6 was observed smoking from the mechanical connection for the cylinder safety valve and process manifold. The Operator seeing the smoke, alerted personnel in the area, actuated the "Emergency Autoclave Shell Closure" and the building "Gas Release Alarm" that placed the Autoclave and other operational autoclaves into containment. Emergency Response Personnel Responded and performed Air Samples for HF and Uranium in the affected area. All samples were less than Minimum Detectable.
The actuation of the 'Emergency Autoclave Shell Closure' and the building 'Gas Release Alarm' is considered to be the manual actuation of Safety Equipment used to mitigate (prevent) a release of UF6. Reportable to the NRC as a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> report. The certificate holder notified the NRC Resident Inspector and on-site DOE Inspector.
Investigation of the incident has revealed that prior to the safety system actuation the cylinder valve had been fully closed, the sampling operation had concluded and that the leak point was between the cylinder valve and the cylinder safety valve. At this point, the safety function of isolating the UF6 leak had been performed prior to the actuation of the safety system. In addition it should be noted that based on leak location, the Pigtail Line Isolation system was not designed to protect against this plant condition. SAR Section 6.9, Table 6.9-1, criteria J.2.B (2) addresses that the J.2 reporting criteria excludes the reporting of actuations that are invalid and occur after the safety function has been completed. As noted above the actuation is invalid because the Pigtail Line Isolation system would not have mitigated this UF6 release and the safety functions that in fact did mitigate the release were taken. It should also be noted that the 'Emergency Autoclave Shell Closure' is not a credited safety system and therefore is not applicable to the stated reporting criteria The Certificate Holder has notified the NRC Resident Inspector (Bruce Bartlett) and DOE (Russ Vranicar). Notified R3DO (Roger Lanksbury) and NMSS (Doug Broaddus) |
| Where | |
|---|---|
| Portsmouth Piketon, Ohio (NRC Region 3) | |
| License number: | GDP-2 |
| Reporting | |
| Other Unspec Reqmnt | |
| Time - Person (Reporting Time:+11.6 h0.483 days <br />0.069 weeks <br />0.0159 months <br />) | |
| Opened: | Steve May 13:21 Sep 2, 2003 |
| NRC Officer: | Gerry Waig |
| Last Updated: | Sep 15, 2003 |
| 40124 - NRC Website
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Portsmouth Gaseous Diffusion Plant with Other Unspec Reqmnt | |
WEEKMONTHYEARENS 459252010-05-13T20:02:00013 May 2010 20:02:00
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