Unit is shut down in Mode 4 and in process of cooling down to Mode 5 for a scheduled refueling outage. During a containment walkdown to inspect for
boron leakage, personnel identified that Reactor Coolant Pump 'A' seal injection line drain valve has a crack in the socket weld on the upstream side of the valve with active leakage visible as a fine mist. This valve is part of the
Reactor Coolant System pressure boundary.
TS 3.4.13 requires that the unit be placed in Mode 5 prior to
0140 hours0.00162 days <br />0.0389 hours <br />2.314815e-4 weeks <br />5.327e-5 months <br /> on 2/6/13. All Mode 4 required safety related equipment is operable.
The NRC Resident Inspector has been notified.
The last primary leak rate test was conducted at 100% power and determined that there was 0.114 gpm of
unidentified leakage. The leak location is inside the containment bio-shield and is not accessible at power.
