05000220/FIN-2013005-03
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | |
| Description | A self-revealing Severity Level IV NCV of Title 10 of the Code of Federal Regulations (10 CFR) 72.150, Instructions, Procedures, and Drawings, was identified when CENG personnel did not ensure that hydrogen concentrations were being properly monitored and maintained during welding on dry shielded container (DSC) #12 on August 14, 2013. Specifically, site procedure S-MMP-ISFSI-004, DSC Sealing Operation, Revision 00201, provided inadequate direction for the control of purging and hydrogen monitoring calibration, set-up, and operation. This caused an undetected loss of DSC purge and a failure of the hydrogen monitor, ultimately resulting in a hydrogen deflagration in DSC #12. CENG staff generated CR-2013-006840 to address the hydrogen deflagration. Corrective actions included: (1) reducing water level in the DSC by 1100 gallons during welding operations to reduce the amount of hydrogen generation; (2) installed dual hydrogen monitors off the vent line to provide redundant indication; (3) required the performance of local hydrogen monitoring at the weld joint prior to commencing welding; (4) reconfigured the location of the hydrogen monitors; (5) ensured hydrogen monitors were properly configured, including the use of the low flow differential pressure switch setting in a helium environment; and (6) adjusted the alarm settings on the hydrogen monitors. The inspectors determined that CENG personnels failure to provide adequate instructions, procedures, and drawings to ensure that hydrogen concentrations were being properly monitored and maintained in accordance with 10 CFR 72.150, Instructions, Procedures, and Drawings, during welding of DSC #12 on August 14, 2013, was a performance deficiency that was reasonably within CENG staffs ability to foresee and correct, and should have been prevented. As a result, a hydrogen deflagration occurred. The failure to properly monitor and maintain hydrogen concentrations had the potential to damage the DSC and spent fuel within the DSC. Because the issue involved independent spent fuel storage installation (ISFSI) operations, consistent with the guidance in Section 2.2 of the NRC Enforcement Policy, the inspectors evaluated this performance deficiency in accordance with the traditional enforcement process. Using Example 6.3.d. from the NRC Enforcement Policy, the inspectors determined that the violation was a Severity Level IV (more than minor concern that resulted in no or relatively inappreciable potential safety or security consequence) violation. The hydrogen deflagration ultimately did not result in the damage to fuel; however, the failure to properly monitor and maintain hydrogen concentrations had the potential to damage the DSC and spent fuel within the DSC. Because the violation involved the traditional enforcement process and was not associated with ISFSI support programs conducted under a 10 CFR 50 license, the inspector did not assign a cross-cutting aspect to this violation in accordance with IMC 0612, Appendix B. |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2013005 Section 4OA5 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | TEV: Severity level IV |
| cornerstone | Other |
| Identified by: | Self-revealing |
| Inspection Procedure: | |
| Inspectors (proximate) | B Dionne D Schroeder E Keighley E Miller H Gray J Deboer J Laughlin K Kolaczyk N Floyd S Hammann T Fish T Hedigan |
| Violation of: | 10 CFR 72, LICENSING REQUIREMENTS FOR THE INDEPENDENT STORAGE OF SPENT NUCLEAR FUEL, HIGH-LEVEL RADIOACTIVE WASTE, AND REACTOR- RELATED GREATER THAN CLASS C WASTE |
| INPO aspect | |
| ' | |
Finding - Nine Mile Point - IR 05000220/2013005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Nine Mile Point) @ 2013Q4
Self-Identified List (Nine Mile Point)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||