Abstract
In VVER-1000/1200 type reactors much higher and geometrically more complex assemblies are applied compared to the VVER-440 design. Additionally, assembly shrouds are not used in the improved reactor types. This implies that the existing sub-channel wise models and hot channel calculation methodologies used in the safety assessment of VVER-440 reactors have to be improved. For this purpose a full core thermal hydraulic model was developed. In the first part of the paper the new model and its connections with the reactor physics of KARATE-1200 code system are demonstrated with results regarding the sub-channel outlet temperature and DNBR. In the second part of the paper the hot channel calculation methodologies to be used in the transient safety analyses of VVER-1200 type reactors are discussed. The appropriate frame parameter concept concerning the limitation of the heating up of the coolant and the single closed sub-channel approach vs. the multi-channel approach are studied, as well.
Kurzfassung
In den Reaktoren des Typs VVER-1000/1200 werden wesentlich höhere und geometrisch komplexere Baugruppen eingesetzt als des Typs VVER-440. Außerdem werden bei den verbesserten Reaktortypen keine Montageblenden verwendet. Dies bedeutet, dass die bestehenden Subkanalmodelle und Heißkanalberechnungsmethoden, die bei der Sicherheitsbewertung von VVER-440-Reaktoren verwendet werden, verbessert werden müssen. Zu diesem Zweck wurde ein thermohydraulisches Vollkernmodell entwickelt. Im ersten Teil des Beitrags werden das erarbeitete neue Modell und seine Zusammenhänge mit der Reaktorphysik des KARATE-1200-Codesystems mit Ergebnissen bezüglich der Subkanalaustrittstemperatur und DNBR vorgestellt. Im zweiten Teil des Beitrags werden die Methoden der Heißkanalberechnung für die transienten Sicherheitsanalysen von Reaktoren des Typs VVER-1200 diskutiert. Auch das geeignete Rahmenparameter-Konzept zur Begrenzung der Erwärmung des Kühlmittels und der einkanalige geschlossene Subkanalansatz vs. der Mehrkanalansatz wird untersucht.
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