South Texas (USA)

Map of South Texas

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2 * 1300 MW PWR unit; constructed by Westinghouse; grid connection in 1988/89.

Facilities in South Texas

plantreactor typconstruction startoperation startshut down
South Texas-1PWR19751988
South Texas-2PWR19751989
1996-01-01

Westinghouse, which has assigned 100 employees to investigate recent control rod drop problems, has not yet determined the root cause of rod mispositioning.
Five control rods at Wolf Creek Nuclear Operating Corp.'s Wolf Creek and seven at Houston Lighting & Power Co.'s South Texas-1 didn't properly drop into the cores after plant trips in December and January, respectively.
Westinghouse does not consider the problem a significant safety issue.
In both cases, the rods were housed in 17x17 " assemblies with burnups exceeding 42,000 MW days per metric ton uranium (MWD/MTU).
Though thimble tube distortion is seen as the apparent cause at Wolf Creek, company officials believe there are myriad other factors that must be explored before the root cause can be determined.
"We're working very hard to understand what's happening." Westinghouse spokesman Nancy Marshall said last week.

1993-02-03

Trip from 98% power caused by overspeed trip condition of the turbine-driven auxiliary FW pump. The series of pump malfunctions began late in December 1992 at both units. Since then 5 pump problems were reported. Shutdown of both units.

1991-12-24

pressurizer spray valve failed open causing a rapid decrease in reactor pressure -> scram, REACTOR TRIP AND SAFETY INJECTION OCCURRED DUE TO LOW PRESSURIZER PRESSURE. THE PRESSURIZER SPRAY VALVE OFF OF THE 2A REACTOR COOLANT LOOP FAILED DUE TO A POSITIONER ARM FROM THE SPRAY VALVE FALLING OFF BECAUSE OF A LOOSE SUPPORT BOLT/NUT ARRANGEMENT.

1991-10-20

All 3 RHR pumps found to have cracked insulation on their motor leads.

1991-10-20

All 3 RHR pumps found to have cracked insulation on their motor leads

1991-03-11

Cracked fuel injector nozzles were found on all EDGS. Cracks were caused by manufacturing and considered to be a generic concern.

1990-06-28

The EHC supply line to the 3" throttle valve ruptured resulting in a main turbine trip

1989-01-20

Fire in a bearing on main generator necessitated a manual turbine trip due to a hydrogen leak causing loss of hydrogen cooling - > scram.

1988-04-01

Dealuminization of fittings in service system caused leaks.