Laguna Verde (Mexico)

Map of Laguna Verde

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BWR 650 MW by GE, operation since 1989
BWR 700 MW under construction

Facilities in Laguna Verde

plantreactor typconstruction startoperation startshut down
Laguna Verde-1BWR19761989
Laguna Verde-2BWR1977
Reactor trip due to high pressure in the reactor pressure vessel

"On January 19, 2011 the Laguna Verde NPP Unit 2 was operating at 43.2% of rated power in process for testing. According to the sequence of events, it follows that: While testing for the load rejection signal, the main turbine incremented its speed. The main turbine control valves started to close while controlling the turbine speed. The pressure at the first step in the turbine was at 17 kg/cm2, with the control valves closed. Then, the pressure at the first step started to decrease until 4.6 kg/cm2. There was a main turbine trip signal due to the actuation of the Speed Acceleration Limiter, but this signal trip did not actuated the RPS, instead there was a reactor trip due to high pressure signal of the reactor pressure vessel. The cause was that the during the power rising process after testing of the Moisture Separator Reheaters the alarms associated to the bypass of the signal trip for the main turbine trip were not reestablished, therefore the during approximately 40 minutes the reactor operated without the reactor trip signal of the main turbine trip."


Non Usual Event declared due to loss of outside power at Laguna Verde NPP U1

"On December 02, 2010, Laguna Verde NPP Unit 1 was operating at 87.5 % rated power, when a loss of outside power event ocurred, and a Non Usual Event was declared by the operator. All safety systems worked as required, including all three diesel generators; and the reactor was taken to a safe shutdown condition."

Potential damage in riser pipe at Laguna Verde NPP U2

"On October 22, 2010, Laguna Verde NPP Unit 2 personnel found during the outage inspection that the riser pipe of two jet pumps of the recirculation system were affected with a small crack. The root cause of this event is still in investigation. Corrective actions are still in planning and the refueling activities are in hold."



First criticality, Commercial operation planned for June 1995.