In Modes 1, 2 and 3, with one
ESW subsystem
inoperable for more than seven days, TS Limiting Condition for Operation (LCO) 3.7.2, condition C, requires the unit to be in Mode 3 within
12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in Mode 4 within
36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. Contrary to the above, since original construction and prior to September 13, 2010, an engineering evaluation determined that the \'A\'
ESW subsystem was
inoperable due to the degraded seismic capability of rod hanger
33HB-S143 that only affected the \'A\'
ESW subsystem. During upgrades to the
ESW discharge pipe support system during the week of September 13, 2010,
PBAPS personnel identified that the original installation of the rod hanger had not been carrying adequate pipe load. This condition was considered as a condition prohibited by TS due to one subsystem of
ESW being
inoperable for greater than the time period allowed by TS. The cause of the event was due to an inadequate design drawing.
PBAPS documented this issue in the
CAP as IRs 1114812 and 1118711. Since there was no actual Joss of safety function as a result of this event, this issue is of very low (Green) safety significance. The LER associated with the event was documented in Section 40A3.1.
