Technical Specification 5.2.1.f requires the containment steel liner to have a nominal thickness of 0.25 inches. Contrary to the above, on October 22, 2010, during a planned inspection,
FPL found corrosion in the lower liner plate at the -15 foot level with areas of the liner to be below 0.25 inches. The liner was backed by concrete and no direct path to the environment was identified.
FPL repaired the liner and planned to recoat the lower cavity area in a future outage.
FPL contracted an evaluation of the liner holes to radiological consequence of an accident and found the contribution to dose from the degradation to be negligible. The finding was screened as Green using NRC
Inspection Manual Chapter 0609, Attachment 0609.04,
SDP Phase 1 screening because the finding did not result in any loss of containment barrier function.
