Safety Measures Implementation at Kashiwazaki-Kariwa Nuclear Power Station

Emergency Safety Measures Implementation at Kashiwazaki-Kariwa Nuclear Power Station

1. Power supply reinforcement Diversification and reliability improvement of power supply Deployment of power supply cars and gas turbine generator cars
Installation of high-voltage switchboards for emergency use and permanent cables
2. Enhanced water injection system Diversification of supply methods and water source Water supply utilizing makeup water pump
Water supply utilizing diesel fire pump
Water supply utilizing fire engine, diverse water source
Diversification of water source
Spare nitrogen gas cylinder used for the safety relief valve operation
3. Enhanced residual heat removal system Alternative equipments and materials Deployment of alternative seawater heat exchanger cars
Spare air cylinder used for PCV vent valve operation

1. Power Supply Reinforcement

In order to promptly secure power to operate the critical equipments in the case of station blackout, large capacity air-cooled gas turbine generator cars are deployed on the high ground in addition to power supply cars. High-voltage switchboards, permanent cables and underground gas oil tanks (for the gas turbine generator cars) have been installed to allow for a swift power supply connection.

- Air-cooled gas turbine generator car: 2 deployed
- Power supply cars: 14 deployed
- Generator equipped with engine: Deployed
-Other equipments/materials (such as connecting cable): Deployed

2. Enhanced Water Injection System

Even in the case that the existing water injection system is disabled, sufficient amount of water can be secured for cooling the reactor, etc. with multiple alternative water injection functions. A freshwater reservoir (Capacity: approx. 20,000 tons) on the high ground at 45m above sea level and a well to supply water to the reservoir will be built to secure freshwater storage used for cooling.

3. Enhanced Residual Heat Removal System

Considering the case that the equipments installed in the Seawater Heat Exchanger Building are flooded and disabled by Tsunami, mobile alternative seawater heat exchanger facilities are deployed on the high ground to ensure the capability of cooling the reactor and the spent fuel pool.

Securement of spare air cylinders

In order to maintain the soundness of PCV, spare air cylinders used for the dry well vent valve and the suppression chamber vent valve have been deployed.