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Stress tests スウェーデンのストレステスト

Stress tests are reviewed by international experts

Right now examine international experts in all EU countries' stress test reports. In late March, a team of experts to Sweden to discuss the Swedish report. In May, the entire review process of their stress tests completed.

After the nuclear accident in Japan, the EU's Council of Ministers of all EU nuclear countries would examine how the nuclear power plants can withstand events that are even worse than previously expected, so-called stress tests.

In summer and autumn of 2011 carried out the Swedish nuclear industry stress tests, then examined the Radiation Safety industry analyzes and compiled the national report.

- But the stress tests are of course not concerned with the practical test what happens if there is a elbortfall or an earthquake. It has instead been about in theory, analyze how well the nuclear power plants can withstand such powerful earthquakes or floods larger than previously expected, says Jan Hanberg.

Radiation Safety Authority was responsible for compiling the Swedish report, delivered to the EU on 31 December. In the Swedish report, found that the Swedish nuclear plants are robust and resistant against most extreme events, but that improvement is required to handle certain events. One such example is that nuclear plants are not fully dimensioned to handle an accident scenario where multiple reactors are knocked out simultaneously, or for protracted events. Another example is that nuclear plants need to be further analyzed on Unit fully withstand a very strong earthquake.


Now, in spring 2012, review of international experts - a so-called peer review team - the national reports. From the Radiation Safety Authority participates five experts in the review of the three countries' reports, Germany, Lithuania and Switzerland.

- There is probably no country where power plants are designed to cope with accidents in which several reactors are knocked out simultaneously. Although failure events that are extended in time need most countries investigate more. Otherwise it's too early to generalize about different countries' results of stress tests, says Jan Hanberg.

First, review experts, country reports and produces a report draft. Then they meet in Luxembourg to work on the Reports. Finally, field a team of experts to each country to discuss outstanding issues.

In Sweden, a team of experts in late March. The experts found the staff at Radiation Safety Authority and will also visit one of the Swedish nuclear power plants.

- The point of the process is to knowledgeable people with a critical eye goes through the various country reports. They examine, for example, if we take into account all relevant contingencies. The review means that we learn from each other, says Jan Hanberg.

Facts

Work on the stress tests are divided into five areas:

Earthquake
Flooding
Extremes of weather
Total elbortfall
Total loss of the Cooling

Accident Management
The international reviewers are divided into six groups visiting the three countries. The reviewers are then also responsible for different parts of the stress tests, one group examines earthquakes, floods and extreme weather, a group examining a total elbortfall and total loss of cooling. The third group examines the failure handling.

Read more about the stress tests

Our work on stress tests
EU Council of Ministers in spring 2011 agreed that all EU countries would carry out stress tests. Each country produced a national report in spring 2012 were reviewed by international experts. The review process was completed in May 2012. Use the results of stress tests has Radiation Safety Authority demanded that the Swedish nuclear plants to report action plans to the Authority by 15 September 2012.

In the same way as was previously learned from nuclear accidents at Chernobyl and Three Mile Island (Harrisburg), the world's nuclear nations to learn from the accident in Japan Fukushima. The EU Council of Ministers in spring 2011, it was therefore agreed that all EU countries would undertake a review of security at the European nuclear power plants, so-called stress tests.

In addition to the requirements of the EU the Swedish government decided that the central interim storage facility for spent nuclear fuel (CLAB) would be stress tested.

It was the nuclear industry who conducted the stress tests, while the Radiation Safety Authority reviewed its analyzes and compiled a national report.
results the agency has reported both to the government, and the European Nuclear Safety Regulators Group (ENSREG). The stress tests for CLAB recognized only to the government. In spring 2012 examined a group of international experts in country reports, so-called peer review. The review process was completed in May.


In light of the results of stress tests has Radiation Safety Authority demanded that the Swedish nuclear plants to report åtgrärdsplaner to the Authority by 15 September 2012.

Read more about the stress tests on ENSREG's website: ENSREG


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by nyfiken | 2012-07-01 08:01