The following violation of very low safety significance (Green) was identified by the licensee and is a violation of NRC requirements which meets the criteria of Section VI of the
NRC Enforcement Policy,
NUREG-1600, for being dispositioned as an
NCV.
Technical Specification 3.3.3.6 requires that the B
steam generator wide range level transmitter, LT-487, be
operable or the plant be shutdown to hot standby with seven days. Contrary to this requirement, LT-487 was not
operable since installation of the transmitter connector assembly during initial plant construction because the connector conductors were not properly insulated. Improper insulation of the conductors could have led to an electrical short circuit in the post-accident reactor containment building environment. This finding was determined to be of very low safety significance because alternate indications of adequate heat sink (narrow range
steam generator level and
auxiliary feedwater flow to the B
steam generator) were available during an event which may have caused a harsh environment inside of the reactor containment building. For events that would not cause a harsh environment inside the reactor containment building, LT-487 would function properly as evidenced by its satisfactory operation since it was installed during plant construction. Therefore, the B
steam generator was available for core cooling. This event is documented in the licensees corrective action program as
AR 221840