Surry (USA)

Map of Surry

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2 * 780 MW PWR units; constructed by Westinghouse; grid connection in 1972/73.

Facilities in Surry

plantreactor typconstruction startoperation startshut down
Surry-1PWR19681972
Surry-2PWR19681973
1996-09-12

Leak in RCS: located in the normal letdown line in a joint that had been replaced the previous month (leak rate 3,5lit/min). Since 1987 there have been 5 leaks in different locations on the same joint - three this year!

1994-11-28

SG clean out: cost for the cleaning itself: US$ 4 million, 1 million to prepare the sludge for disposal at Barnwell
unit was 27 days out of service

1994-07-01

SG clean out: 8100 kg iron & copper buildup removed; Cost US$ 4.3 million unit was 22 days out of service.

1994-04-07

Power reduction, caused by corrosion and dirt in one SG; Steam production was disturbed. Cleaning with nitrogen was not successful. Utility says that the problem is not safety relevant, but only operational.

1991-10-01

Plant examination identified a significant internal flooding vulnerability, that could lead to a station blackout. Unisolated break in service water system which is gravity fed could lead to a continuous flow from the intake canal into the turbine building and from there into the emergency switchgear room, resulting in loss of all power. Risk for this accident sequence was found to be 1:1,000 per reactor year. Utility claims that the high blackout probability is a result of conservativisms in the analyses.

1991-08-21

design review of HPCI pump interlocks found that the pumps were being operated in a configuration that could prevent automatic operation during an accident

1990-10-23

Containment spray heat exchangers had inadequate service water flow, caused by biological fouling and fragments of pipe coating.

1990-10-23

Containment spray heat exchangers had inadequate service water flow, caused by biological fouling and fragments of pipe coating.

1990-09-09

2 of 3 ESW pumps´ flowrates were less than required, pumps had become fouled with marine growth, discovered on unit1, common mode failure to both units

1990-03-15

Both containment vacuum pumps were inoperable, pumps´internals were binding as a result of corrsion buildup, moisture had accumulated in the casings

1990-03-14

All 3 emergency seawater pumps were inoperable, the pump´s diesel engines did not start, loss of ultimate heat sink

1990-03-14

All 3 emergency seawater pumps were inoperable, the pump´s diesel engines did not start.->Loss of ultimate heat sink

1989-10-12

Unit shut because of a small leak in 1 of the 3 Westinghouse PRZ safety relief valves. Valves were sent to West inghouse for testing and repairs. But when the valves were reinstalled and the setpoints setted one of the three valves lifted during heatup. Two other PWRs have so far experienced setpoint problems (Summer and Diablo Canyon). If setpoints are too high, they could allow overpressurization and possible pipe rupture, if they are too low, they might needlessly challenge the integrity of safety systems.

1988-09-26

Thinning of safety related main feedwater and other piping occured more rapidly than expected: 2 or 3 times the expected rate of 20 to 40 mils per year. Cause is probably the oxygen content in secondaryside water, needed to help prevent IGSCC in steam generator tubes.

1988-05-17

Failure of backup refueling cavity seal resulted in loss of 110.000 liters of reactor grade borated water and draindown of refueling cavity.

1988-05-16

Degraded flow in AFW system to SG, scram, SI (manual)

1988-03-27

Degraded flow (1300 lit/min to 530 lit/min) in AFW system to SG.