Federal Reports

In light of recent gas-related explosions in the utility industry, we conducted a review of Tennessee Valley Authority's (TVA) safety of gas line and gas plant operations. The objective of our review was to determine if TVA has taken appropriate steps to identify and mitigate risk associated with the operation of gas plants and gas lines. We found that the vast majority of gas-related explosions were gas line related. According to TVA personnel, TVA is not responsible for gas until it reaches the reducing stations on TVA property. This significantly decreases TVA's risk of a gas-related incident. We did identify explosions in Middletown, Connecticut and Garner, North Carolina that occurred at gas plants due to improper commissioning. In both instances, fuel gas was used to clean or purge gas pipes of debris, air, or other substances. TVA has taken steps to mitigate this risk by using compressed air instead of gas to clean or purge gas pipes.As part of TVA's Risk Management program, the organization has identified asset performance vulnerability. Asset performance vulnerability impacts TVA's ability to provide power when there is a demand. The risk for asset performance vulnerability is driven by equipment-failure-related incidents that cause forced-outage events and planned-outage extensions of significant duration. According to TVA's Risk Management program, the severity for asset performance vulnerability is moderate. TVA has mitigated these risks. In addition, TVA has completed the draft of a Natural Gas Piping System Management manual. This manual provides the primary standards and methodology required for the commissioning, maintenance, and integrity management of natural gas piping systems found at TVA fossil power group properties.

On Monday December 22, 2008, the ash containment area at the Kingston Fossil Plant failed. Approximately 5.4 million cubic yards of fly ash and bottom ash were released onto land and adjacent waterways. As part of the OIG's ongoing commitment to provide oversight of the Kingston ash spill cleanup, we reviewed TVA's non-time-critical Kingston Ash Recovery Project activities.The objectives of this review were to determine (1) the overall status of the non-time-critical phase of the Kingston Ash Recovery Project and (2) if TVA is meeting the schedule for non-time-critical activities. During our review, we found that TVA has made significant progress in the non-time-critical phase of the Kingston Ash Recovery Project. Specifically, TVA has recently completed the following activities: (1) removing ash from the North Embayment, (2) buttressing of Dike C, (3) transferring a portion of a nearby ball field to the Kingston Fossil Plant, and (4) replacing the skimmer wall in the intake channel. In addition, TVA has ongoing non-time-critical activities that include: excavating ash from the Middle Embayment, constructing the Perimeter Wall Stabilization around the on-site disposal areas, disposing of ash on-site, studying the effects of residual ash on the river system, and creating a master plan for park and recreation areas. While TVA is making progress in the completion of non-time-critical activities, we found that five of nine activities reviewed did not meet the scheduled completion date. If the project continues late completion of activities, there is an increased risk that the overall project completion date of 2015, disclosed in the company's financial statements, could be delayed.We recommend TVA's Senior Vice President, Generation Construction, evaluate the current schedule to determine if the identified delays have caused overall schedule slippage. If it is determined that the overall schedule will be delayed beyond the date disclosed in the footnotes to TVA's financial statements, then the disclosure should be updated. TVA management agreed with our recommendation and has taken actions to address it.

The audit objectives were to determine whether program funds were managed in accordance with the ARC and Federal grant requirements