05000331/FIN-2013010-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | |
| Description | From IR 2013-002 An unresolved item was identified by the inspectors for issues of concern associated with the catastrophic failure of the A SBDG lube oil heat exchanger gasket on March 8, 2013. Specifically, during a maintenance run on March 7, 2013, with the A SBDG considered inoperable for embedded cable inspections, the lube oil heat exchanger channel head gasket developed an initial 2-3 drop-per-minute (dpm) lube oil leak that increased to 60 dpm. Following completion of the maintenance run, the licensee verified minimum acceptable torque of the channel head fasteners and re-started the A SBDG with the intention of increasing the torque on the fasteners in an attempt to minimize or eliminate the leak. Within minutes of starting the A SBDG, the gasket catastrophically failed and resulted in a significant oil leak that required local manual shutdown of the engine. From IR 2013-010 Based on the results of this inspection, the Nuclear Regulatory Commission (NRC) has identified a finding that has been preliminarily determined to be a White finding of low to moderate safety significance that will result in additional NRC inspection and potentially other NRC action. As described in Section 1R12, the self-revealed finding involved the failure to prescribe a work instruction of a type appropriate to the circumstances for the re-assembly of the A SBDG lube oil heat exchanger. Specifically, the work instruction did not contain sufficient detail and acceptance criteria, appropriate torque values, and operating experience information to ensure the gasket was properly compressed. The finding is not a current safety concern. On March 8-10, 2013, actions were completed to replace, and properly install the gasket, and successfully demonstrate operability of the A SBDG following testing. Your staff also performed an immediate extent-of-condition evaluation to provide assurance that the B SBDG was not susceptible to a similar concern with the lube oil heat exchanger. IR2013-011 - Therefore, after considering the information developed during the inspection and the additional information provided on October 29, 2013, during the Regulatory Conference, and on November 12, 2013, the NRC has concluded that the finding is appropriately characterized as White, a finding of low to moderate risk significance. |
| Site: | Duane Arnold  |
|---|---|
| Report | IR 05000331/2013010 Section 1R12 |
| Date counted | Sep 30, 2013 (2013Q3) |
| Type: | Violation: White |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.12 |
| Violation of: | 10 CFR 50 Appendix B Criterion V |
| INPO aspect | |
| ' | |
Finding - Duane Arnold - IR 05000331/2013010 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Duane Arnold) @ 2013Q3
Self-Identified List (Duane Arnold)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||