05000249/FIN-2014002-01
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Finding | |
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| Title | Failure to Maintain Secondary Containment Integrity During Outage Demobilization Activities |
| Description | A finding of very low safety significance and associated non-cited violation of Technical Specification (TS) 5.4.1, Procedures, was self-revealed on November 28, 2013, when the integrity of the secondary containment for Unit 3 was not maintained when plant personnel bypassed interlock features, designed for preventing both doors of a secondary containment interlock from being simultaneously open, in order to remove equipment from a work area. Specifically, during demobilization activities from Unit 2 refueling outage D2R23, a radiation protection technician (RPT) and station laborers were dispatched to the Unit 2 main steam tunnel area, known as the Unit 2 X-Area, to remove lead blanket shielding which had been used to support maintenance work during the outage. Upon arriving at the Unit 2 X-Area the RPT and laborers opened and held open the outer containment door and attempted to simultaneously open the inner containment door. The installed door interlock prevented the RPT from unlocking the inner door. Not understanding the significance of this, the RPT pressed the emergency open push button which is normally reserved for personnel emergencies and bypassed the secondary containment interlock, opening both doors simultaneously. With both doors open, the team began removing the lead shielding blankets from the X-Area to the adjacent turbine building. Main control room operators, receiving the X-Area interlock door trouble alarm, dispatched an Equipment Operator (EO) to investigate. Upon arriving at the X-Area, the EO directed the doors to be shut restoring secondary containment integrity to Unit 3. The simultaneous opening of the Unit 2 X-Area secondary containment interlock doors for 15 minutes was contrary to step 3.6 of licensee procedure CC-AA-201, Plant Barrier Control Program, and was a performance deficiency warranting further review. The performance deficiency was determined to be more than minor, and thus a finding, because it was associated with the Barrier Integrity Cornerstone Attribute of Configuration Control and adversely affected the cornerstone objective to provide reasonable assurance that physical design barriers protect the public from radionuclide releases caused by accidents or events. The finding was determined to be of very low safety significance because the inspectors answered yes to question C.1 in IMC 0609, Appendix A, Exhibit 3, Barrier Integrity Screening Questions. The finding has a cross-cutting aspect of Challenge the Unknown (H.11), in the area of human performance, for failing to appropriately challenge an unexpected condition when the RPT and laborers determined that the containment interlock doors were closed with the interlock in operation. Specifically, the individuals did not request further guidance from their supervision or the operations watch team with regards to the status of secondary containment. This information would have revealed to them that their task of demobilizing lead shielding in the Unit 2 X-Area would have to be completed while maintaining the integrity of the secondary containment interlock barrier. |
| Site: | Dresden  |
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| Report | IR 05000249/2014002 Section 4OA3 |
| Date counted | Mar 31, 2014 (2014Q1) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | A Shaikh D Betancourt G Roach J Cameron M Jones M Porfirio R Edwards T Go |
| Violation of: | Technical Specification - Procedures Technical Specification |
| INPO aspect | |
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Finding - Dresden - IR 05000249/2014002 | |||||||||||||||||||||||||||||||||||||||||
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Finding List (Dresden) @ 2014Q1
Self-Identified List (Dresden)
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