The importance of paying close attention to what’s different day-to-day led to two recent inspection findings at nuclear power plants in Region I.
Scaffolding is sometimes erected at nuclear plants to allow workers to reach areas or equipment they couldn’t reach otherwise, the same as at other facilities. While walking down the plant last August, the Ginna resident inspector noticed temporary scaffolding was preventing full operation of a sprinkler system. When looking into it further, the inspectors learned workers had not received prior approval by the on-site fire department to block the sprinkler, as required by plant procedures.
After being notified of the finding, the company took immediate action to correct the scaffolding and placed the issue in its corrective action program. However, this was the 13th issue related to scaffolding at Ginna since September 2012 and NRC inspectors documented this performance deficiency in their quarterly inspection report. The resident inspectors will continue to follow the company’s corrective actions to assure they’re effective and comprehensive.
The NRC resident inspectors at Peach Bottom also had an inspection finding related to scaffolding. During an August inspection to ensure that changes made for a Unit 3 refueling outage hadn’t led to any new radiological hazards that could impact the onsite workers, the inspectors found some temporary scaffolding made it possible to access a locked high radiation area.
It seems the scaffolding would have allowed someone to reach a permanent ladder that led to a high radiation area. There also were no signs to alert workers to the radiological conditions despite a requirement that such areas be posted and controlled to avoid unnecessary worker exposure.
Based on the inspectors’ feedback, the company posted workers in the area until it could take more permanent action to prevent access to the area. After more questions by the resident inspectors, the company performed a thorough review of both units (called an extent-of-condition review) and found twelve additional areas that required enhanced controls/postings. An NRC inspection report documented the finding.
These are two good examples of inspectors remaining aware of changing conditions and activities taking place in the plant. It also shows the inspectors asking the important question “have you considered the extent of condition?” This review may uncover a programmatic issue and/or increase the risk significance depending upon the condition of other similar systems, structures or components.