Responding to New Regulatory Requirements Compliance Reviews at Units 6 and 7 of the Kashiwazaki-Kariwa Nuclear Power Station

20Fire protection measures Design basis target facility（prevention of major accidents）

Requirements from the New Regulatory Requirements: ●Facilities necessary to ensure that the safety of reactors should not be impaired by fires occurring within the power station.
　① Fire prevention
　② Installation of fire detectors and fire extinguishers
　③ Measures to reduce the impact of fires
Actions taken at the Kashiwazaki-Kariwa Nuclear Power Station: ●Fire prevention
　The use of flame-retardant cables, fire prevention of ignitable and flammable materials and preventive measures for hydrogen leakage are being conducted.
●Installation of fire detectors and fire extinguishers
　・Two types of fire detectors were installed respectively for smoke and heat for early fire detection.
　　Fire extinguishers were installed in fixed locations where it is difficult to carry out firefighting activities.
　・Self-defence fire brigade is on firefighting duties 24 hours a day.
●Measures for reducing the impact of fires
　・Fireproof barriers that can contain fire for 3 hours were installed to prevent the spread of fire,
　　so that facilities necessary to shut down or cool reactors are secured in at least one compartmentalized area,
　　even in situations where a fire cannot be extinguished immediately.

20Fire protection measures Design basis target facility（prevention of major accidents）

Requirements from the New Regulatory Requirements: ●Facilities necessary to ensure that the safety of reactors should not be impaired by fires occurring within the power station.
① Fire prevention
② Installation of fire detectors and fire extinguishers
③ Measures to reduce the impact of fires
Actions taken at the Kashiwazaki-Kariwa Nuclear Power Station: ●Fire prevention
The use of flame-retardant cables, fire prevention of ignitable and flammable materials and preventive measures for hydrogen leakage are being conducted.
●Installation of fire detectors and fire extinguishers
・Two types of fire detectors were installed respectively for smoke and heat for early fire detection. Fire extinguishers were installed in fixed locations where it is difficult to carry out firefighting activities.
・Self-defence fire brigade is on firefighting duties 24 hours a day.
●Measures for reducing the impact of fires
・Fireproof barriers that can contain fire for 3 hours were installed to prevent the spread of fire, so that facilities necessary to shut down or cool reactors are secured in at least one compartmentalized area, even in situations where a fire cannot be extinguished immediately.