NRC Issues Comprehensive Inspection Report on Arkansas Nuclear One
June 13, 2016Posted by on
Senior Public Affairs Officer
The NRC has just issued a lengthy report documenting the results of a comprehensive inspection conducted earlier this year at Arkansas Nuclear One, or ANO. The plant, operated by Entergy Operations, Inc., is located in Russellville, Ark.
On March 4, 2015, the NRC moved ANO into Column 4 of the agency’s Action Matrix (where operating plants with significant performance issues receive the second highest level of NRC oversight). This followed inspection findings of substantial safety significance stemming from a heavy equipment incident as well as degraded flood protection at the site. As part of its increased oversight of ANO, the NRC conducted a rigorous, independent, diagnostic assessment of the performance, programs and processes at the site earlier this year.
A team of 27 NRC inspectors from all four NRC regional offices and NRC headquarters spent about 3,800 hours of direct inspection. They concluded that despite its problems, ANO has been –- and continues to be — operated safely. This judgement was based on the fact there have not been any safety-significant inspection findings since the plant’s move to Column 4. Inspectors also concluded the robust plant design had not been compromised and the ANO staff’s operational focus has improved.
In addition to inspecting ANO’s program for evaluating and correcting performance issues, the NRC team developed insights into the causes for the performance decline at ANO. The team also evaluated the adequacy of a third-party safety culture assessment ANO commissioned. Additionally, the NRC inspection included an assessment of how well ANO determined the root causes for its performance deficiencies and developed performance improvement programs.
Based on Entergy’s review of the causes of the performance decline, the independent third-party nuclear safety culture assessment findings, and the results of the NRC’s independent diagnostic evaluation, “the team determined that Entergy understands the depth and breadth of performance concerns associated with ANO’s performance decline,” NRC Region IV Administrator Marc Dapas said in a letter to Entergy officials accompanying the report.
Dapas further stated that “effective implementation of the comprehensive recovery plan, supported by the allocation of adequate resources and continued enhanced oversight by Entergy leadership, should lead to substantial sustained performance improvement.”
The NRC team documented 16 findings of very low safety significance. The 243-page report goes into a high level of detail about the results of the inspections, but here are some highlights:
- Resource reductions and leadership behaviors were the most significant causes for ANO’s declining performance. Entergy reduced resources across its fleet in 2007 and 2013, but it did not adequately consider the unique staffing needs for ANO created by having two units with different designs.
- ANO management did not reduce workloads through efficiencies or the elimination of unnecessary work, as was intended as part of the resource reduction initiatives. Leaders attempted to prioritize work with the available resources, but they did not address expanding work backlogs. Over time, this contributed to equipment reliability challenges.
- An unexpected increase in employee attrition between 2012 and 2014 caused a loss in experienced personnel, which led to a reduced capacity to accomplish work, and an increased need for training and supervision.
- Since 2007, the reduced resources created a number of changes that slowly began to impact equipment reliability. The Entergy fleet reduced preventive maintenance and extended the time between some maintenance activities.
The NRC inspection team reported its preliminary findings at an April 6 public meeting held in Russellville. The NRC is preparing a Confirmatory Action Letter to document Entergy’s commitments to address performance issues identified in the inspection report and the key actions needed to ensure sustained improvement in safety performance. The NRC expects to issue this letter and make it publicly available later this month.
NRC will conduct quarterly inspections to verify that ANO successfully undertakes all necessary improvement actions. From these inspections, NRC will independently determine whether ANO’s corrective actions have been effective and whether, after a period of sustained good performance, the NRC can return ANO to normal oversight.