During testing it was discovered that the H. B. Robinson Steam Electric Plant, Unit 2 (
RNP)
Lake Robinson Dam Tainter Gates A and B were in degraded condition. The Tainter Gates are non-technical specification features of design that control
Lake Robinson water level.
RNP was not able to achieve full opening of the Tainter Gates. Subsequent analysis has concluded that the degraded condition of the Tainter Gates adversely impacts their
UFSAR credited safety function. On 8/11/2016, at 1505 EDT, it was determined this places
RNP in an
unanalyzed condition that significantly degrades plant safety [per]
10 CFR 50.72 (b)(3)(ii)(B). The Tainter Gates have been repaired, tested and rendered complaint with their original licensing basis function. The current plant status does not pose undue risk to the health and safety of the public.
The NRC Senior Resident Inspector has been notified of this condition.
