Cruas (France)

Map of Cruas

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4 * 900 MW PWR units constructed by Framatome. operation started in 1983/84

Facilities in Cruas

plantreactor typconstruction startoperation startshut down
Cruas-1PWR19781983
Cruas-2PWR19781984
Cruas-3PWR19791984
Cruas-4PWR19791984
1993-11-09

At full power: an error in setting a protection treshold value for in-core neutron flux imbalance led to exceeding specified operational limits for a few hours. Neutron flux imbalance reached 13% instead of max. 6%.

1993-04-24

During outage mistaken identification of 4 valves led to unavailabilty of the SI system and the primary water make-up system for 5 hours and 45 minutes.

1992-04-08

Pieces of tape that had been used during welding were discovered in the containment spray system. 11 other reactors were found to be affected by the same problem (Cruas-3, Flamanville-2, Golfech-1, Gravelines-3,&6, Paluel 3&4, Penly-2). Pieces of tape migrating through the containment spray could have reduced its capacity.

1992-03-30

Corrosion at the bottom of containment liners found throughwall at some places during inspections.

1991-11-12

During 5th-year inspection it was discovered that filters had been left installed in piping upstream of the SG emergency FW pumps ever since the startup of the unit - more than 6 years earlier. Periodic tests had not revealed any degradation of the pumps peformance. Inspections at the station revealed the same problem at other units.

1991-11-12

During 5th-year inspection of unit-2 it was discovered that filters had been left installed in piping upstream of the SG emergency FW pumps ever since the startup of the unit - more than 6 years erlier. Periodic tests had not revealed any degradation of the pumps peformance. inspections at the station revealed the same problem on 1 pump at unit-4

1991-08-16

Two vinyl bags were discovered near containment sump filters. The bags could have blocked the sump filters (likely been left there during the last outage in March 91).

1990-10-30

Failure of a switch and resulting fire rendered 1 of the 2 electrical panels supplying RPS unavailable -> shutdown. Cooling maintained via the secondary circuit.

1990-08-21

110 m³ meters of radioactive water from an auxiliary tank in the RCS were dumped into the auxiliary building.

1990-02-01

Inspection showed that 20 SG tubes were dented at the base, just above the tubesheet. Defect is similar to that affecting many of EdF's 1300MW plants. Defect is probably caused by oxidation and swelling of sludge built-up .

1990-01-22

Liquid radioactive waste was too rapidly released from a storage into the River Rhone. Instead of 40 Bq/l 56 Bq/l were released - 18 cu.m over 26 hours instead of 10 !

1989-12-19

A defect in the electrical system led to a drop in power at the outlet of the turbine generator. After this incident not all the turbine bypass valves closed again. The RCS underwent a significant drop in temperature. The RPS triggered automatic scram and safety injection.

1989-08-21

Lloose pins and bolts in SG springloaded safety valves were discovered. While the valves would have reacted properly to overpressure, the presence of the bolts could have prevented the valves from reseating completely. Inspection of all SG safety valves in EDF's 900 MW PWRs is planned.

1989-08-18

One of four neutron flux measurment systems was unavailable by an anomaly in the electronic signal treatment.

1989-01-21

During refueling the presence of tritium was detected in a sump underneath the reactor building, outside containment. The tritium came from a leak in a primary circuit isolation valve outside containment. About 60 l of water leaked into the sump due to failure of a seal between the reactor building and the adjacent auxiliary building.

1988-11-01

It was discovered that the intake canal bringing Rhone water to the plant contained scrap material (from construction). The presence of the scrap could have prevented water intake.