This document provides information on 6 nuclear power plant units in the aftermath of an earthquake. Unit 1 experienced damage to its core and fuel integrity and was decreasing in reactor pressure vessel (RPV) temperature. Units 2 and 3 also showed damaged cores and fuel but stable RPV temperatures. Unit 4 was in outage so no fuel was present. Unit 5 was also in outage with no immediate concerns reported. Unit 6 was in cold shutdown with water levels and pressures being maintained using off-site power and equipment.

1. Unit 1 2 3 4
Power (MWe /MWth) 460/1380 784/2381 784/2381 784/2381
Type of Reactor BWR-3 BWR-4 BWR-4 BWR-4
Status at time of EQ In service – auto shutdown In service – auto shutdown In service – auto shutdown Outage
Core and fuel integrity Damaged Damaged Damaged No fuel in the Reactor
RPV & RCS integrity RPV temperature decreasing RPV temperature stable RPV temperature stable Not applicable due to
outage plant status
Containment integrity No information Damage suspected Damage suspected
AC power available - power to AC power available – power to AC power available – power to AC power available – power
AC Power instrumentation – Lighting to instrumentation – Lighting to instrumentation – Lighting to to instrumentation – Lighting
Central Control Room Central Control Room Central Control Room to Central Control Room
Building Severe damage Slight damage Severe damage Severe damage
Around half of Fuel is Around half of Fuel is Around half of Fuel is
Water level of RPV
uncovered uncovered uncovered
Pressure of RPV Slowly increasing Stable Stable
Not applicable due to
CV Pressure Drywell Stable Stable Stable
outage plant status
Injection of freshwater – via Injection of freshwater – via Injection of freshwater – via
Water injection to RPV mobile electric pump with mobile electric pump with mobile electric pump with
off-site power off-site power off-site power
Water injection to CV No information No information No information
Freshwater injection via
Fresh water injection by Freshwater injection to the Fresh water injection by
Spent Fuel Pool Status Fuel Pool Cooling Line and
concrete pump truck Fuel Pool Cooling Line concrete pump truck
Periodic spraying
05/04/2011 07:00 UTC

2. Unit 5 6
Power 784/2381 1100/3293
Type of Reactor BWR-4 BWR-5
Status at the EQ occurred Outage Outage
Core and Fuel Severe condition
RPV & RCS integrity
Containment int. Concern
AC Power
No immediate
concern
Building
Cold Shutdown Cold Shutdown
Being maintained using off- Being maintained using off-
Water level of RPV
site electrical power and site electrical power and
existing plant equipment. existing plant equipment.
Pressure of RPV
Containment Pressure
Water injection to RPV
Water injection to CV
Spent Fuel Pool Status
05/04/2011 07:00 UTC