Due to the accident at the Fukushima Daiichi Nuclear Power Station in 2011, the activities of all the nuclear power stations in Japan were halted. After that, the regulations system and standards were revised, and two BWRs have restarted under the new regulation standards.
In the accident at the Fukushima Daiichi Nuclear Power Station, multiple pieces of safety equipment and safety systems lost their ability to function at the same time due to the earthquake and tsunami. In addition, the progression of the severe accident could not be stopped after this. Applying the lessons learned from this accident, we will take measures to improve BWRs.
(Source: Nuclear Regulation Authority website)
Due to the accident at the Fukushima Daiichi Nuclear Power Station, new regulatory requirements have been stipulated revising the former requirements.
The design standards in the new regulatory requirements became more stringent and new requirements were added. Furthermore, regulations regarding severe accidents and specified serious accidents (counterterrorism and countermeasures for aircraft crashes) were added.
Comparison of the Pre-existed and the New Regulatory Requirements(Source: Nuclear Regulation Authority website)
