I. PURPOSE AND SCOPE

Due to the salt water environment and direct system leakage of salt water, corrosion has degraded the structural integrity of conduits, cable trays, and supports in the Service Water Building. Many conduits are significantly degraded where the conduits penetrate the floor. Also, many other equipment supports have corroded at floor level and require replacement. In addition, some corrosion of cable trays has occurred. This degradation could affect service water functionality if not repaired and controlled.

Some conduit replacements may involve pulling back cables, chipping back concrete, removal of corroded conduit, and installation of new corrosion-resistant conduit. Concrete will be poured around the new conduits, forming a curb formed to ensure runoff of drainage water in the future. Defective cable will be spliced and repaired where needed. Other corroded areas are not yet to the point of structural risk and can be cleaned and treated without replacement.

Significant repair and refurbishment has been accomplished under this project to date. Substantial work remains to be done. Long term success for this project requires continued inspections and maintenance such that cable trays, conduits, and other supports in the Service Water Building are not structurally degraded by corrosion in the future.

II. EVALUATION

Schedule Index: 26 - Equipment corrosion in the Service Water Building is to the point where the system function could be affected if these refurbishment efforts are not continued. Risk analysis indicates that service water train availability is a significant contributor to nuclear safety (0.5 x 32). Many of the needed repairs have been designated as limiting for start-up. While this refurbishment is not currently on the critical path, future problems could affect plant availability if not arrested (0.2 x 12). Maintenance of adequate material condition in the Service Water Building is a substantial plant enhancement issue (1.0 x 8).

Economic Aspects: While this project should effectively prevent future corrosion of replaced conduits, salt water degradation of equipment is an ongoing problem and long term efforts will be required to combat corrosion and refurbish degraded equipment. Thus, some level of continued effort and funding for such followup work will be included in routine business planning.

Related Standards: The applicable Work Management Policy is for material condition. The standard is to remove corrosion before structural integrity is challenged.

Other Considerations: Much of the work requires equipment to be shutdown. Some of the work will require unit outage. Coordination with related projects such as P0057A is also needed.

III. CONCLUSION

Due to the potential for system failure, this project will proceed as scheduled.