The RSK laid down its consultation programme under consideration of the findings from the events in the Japanese plant in Fukushima. Furthermore, the agenda for the closed meeting in September was discussed.

The RSK adopted the recommendation "Regulations on plant conditions after occurrence of an incident" (in German).

The RSK was informed, among others by the BMU, about the status of the EU stress tests and on the progress of work of the RSK ad hoc working groups (see 445th RSK meeting).

The RSK discussed and adopted the following statements:

The RSK was informed about the progress of work within the ad hoc working groups:
grid stability,
long-term operation and post-operational phase of the fuel pools,
station blackout and long-lasting loss of offsite power,
loss of service water supply (loss of primary ultimate heat sink),
load crash,
flooding of the annulus,
flood,
earthquake: consideration of all of all conditions of low-power and shutdown operation,
aircraft crash with fuel fire, and
accident management measures.

The RSK-structured its consultations in connection with the RSK safety review, taking into account the EU stress test process, and defined the terms outage operation and post-operational phase for this work. Furthermore, the current situation regarding the storage of irradiated fuel elements in the decommissioned German plants was presented and discussed. The consultations on the detailed definition of the RSK’s understanding of robustness have started.

The RSK was informed, among others by the BMU, about the status of the EU stress tests.
The RSK discussed and adopted the following statements:

At the meeting, the RSK took note of the report of the RSK Committee on PLANT AND SYSTEMS ENGINEERING (AST) on the “Superposition of events with system operating conditions of short duration” (in German) and continued the consultations on the statement “Operating documents: requirements and conditions of safe operation” and on the “RSK’s understanding of the safety philosophy”.

The RSK adopted its statement on the proof of the technical qualification of nuclear power plant personnel. The report of the RSK Committee on ELECTRIC INSTALLATIONS (EE) "Testing and monitoring programme for oil-paper insulated transformers and dry transformers in German nuclear power plants" was discussed. The consultations on the topic of robustness have been continued and on the RSK’s understanding of the safety philosophy started.

At its 442nd meeting, the RSK was informed by the Federal Network Agency regarding the supply security of German nuclear power plants in view of possible stability problems in the German power grid. Further consultations are to take place in the ad-hoc working group NETZ (grid) of the RSK Committee on ELECTRIC INSTALLATIONS (EL). The RSK adopted its short definition of the term "robustness" under the boundary conditions of the EU stress tests, in which the terms cliff edge effect and robustness are explained according to the definitions of the IAEA and ENSREG.

The RSK discussed assessment criteria for the evaluation of the operator reports within the framework of the "Plant-specific safety review of German nuclear power plants in the light of the events in Fukushima-I ".

The discussions have to be continued at the next meeting.

The discussions on the assessment criteria for the evaluation of the operator reports, started at the 435th meeting, were completed.