Gravelines (France)

Map of Gravelines

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4 * 900 MW PWR units constructed by Framatome

Facilities in Gravelines

plantreactor typconstruction startoperation startshut down
Gravelines -1PWR19751980
Gravelines- 3PWR19751980
Gravelines-2PWR19751980
Gravelines-4PWR19761981
Gravelines-5PWR19791984
Gravelines-6PWR19791985
2008-12-26

During the restart of the reactor a security injection circuit for boric acid was not configurated according to the rules.

1995-10-15

Unit went back on line after an outage during which 274 tubes were plugged in the SGs. unit is EdF's most affected reactor since the severe degradation was first discovered at Fessenheim-2 in April 1995.
EDF had to plug more tubes as planned at Gravelines-2 and is thinking now about SG replacement in 1996 or 97.

1992-07-26

A mobile lamp fell into the spent fuel pool during refueling and was sucked into the cooling system. pump was stopped - temperature rose some 12°C to 52 °, until the lamp was found.

1992-03-07

Leak in RC - sampling system (lack of leaktightness fo the isolation valves) - operators waited 5 hours too long before deciding to shut down the unit.

1992-03-06

Primary coolant level indicator dropped suddenly during operations preceding opening of the vessel for refueling. Improper management of the primary circuit venting system had allowed formation of an air cushion under the reactor lid. The air escaped as soon as the vessel was opened and proper coolant level was restored. (The same was committed at unit-3 on 19.3.92)

1991-07-19

Spent fuel cooling was interrupted for about 2 hours, leading to a rise in pool temperature of about 4 °C, caused by failure of a electrical panel

1991-07-05

Volume of primary coolant was found to be 10 cu meters lower than required, because the RPV vent valve, which allows expulsion of air during RCS filling, had remained closed, leading to formation of an air cushion under the vessel head and an erroneous measurment of primary coolant level

1991-05-12

During refueling outage it turned out that part of the safety injection system was unavailable because coolant temperature had not reached the required level of 90°C (it was 170°C).

1991-02-01

Some 30 valves on CCS and other safety related auxiliary systems were found blocked open during checks of the entire PWRs. First discovered in Gravelines-6. Furher investigations are planned.

1990-01-28

Unit was in shutdown with 1 of 3 RC pumps operating. Core temperature was 170 °C when the last pump was stopped for inspection. Operators were unable to restart any of the pumps. Use of RHR system led to a sudden cooldown.

1989-07-07

Unit was operating at full power when measurment showed that the boron concentration in the safety injection tank was lower then required. staff took 3 days to bring the boron to the specified concentration

1989-04-01

Failure of a control rod to drop into the core. The control rod had broken off and fallen to the bottom of a fuel assembly. Its spring was stuck within the guide tube, causing control rod cluster to stick at the intermediate position. Analysis showed that local wear on the control rod casing was far more severe than had been predicted by studies. EDF plans to inspect all CRs on the 900MW and 1300MW units (together 25). The CR problem is projected to cost EDF at least 100 million francs (US $ 15 million) this year.

1989-03-29

Technician undertook an adjustment to a safety injection system valve on unit 4 (operating at full power - instead of the identical valve on unit 3. the design of th 900 MW plants: twin units share several systems including control rooms - has already led to such errors in the past.

1989-02-23

Leak of primary coolant from an auxiliary sampling system led to a small realease of radioactive steam from the reactor building stack.

1988-12-15

Fire damaged transformer