Technical Specification 3.3.2, Engineered Safety Feature Actuation System (
ESFAS) Instrumentation, required the
ESFAS instrumentation for each function in Table 3.3.2-1 to be
operable. Table 3.3.2-1, Function 4.e., Steam Line Isolation required two (2) channels per steam line and is applicable in Mode 1 and Modes 2 and 3, except when one
main steam isolation valve (
MSIV) is closed in each steam line. When one channel is
inoperable Condition D is entered which required placing the
inoperable channel in trip within
72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. Contrary to the above between November 29, 2011, through January 4, 2012, and again on May 14, 2013, through May 29, 2013, a 2C
steam generator steam flow transmitter (FT-494) was found to have a trip setpoint above the TS required value of 110.3 percent. Action was not taken to either restore the flow transmitter to
operable status or place the channel in trip within
72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> until Operations staff was made aware of the issue on January 4, 2012, for the first occurrence and again on May 29, 2013, for the second occurrence. Subsequently, FT-494 was recalibrated to within the TS allowable value and placed back in service on January 7, 2012, and June 1, 2013. These issues were entered in the licensees
CAP as CRs 389633 and 646824. The finding screened to Green, very low safety significance, in accordance with the NRCs
SDP because it did not represent an actual loss of function of a single train for greater than its TS allowed outage time. Redundant instruments to the
main steam isolation circuitry were available to actuate the
main steam isolation function at the required setpoint. This violation is associated with Unit 2 LERs 05000364/2013-001-00 and -01.
