The RSK discussed and adopted the recommendation on damages to steam generator tubes due to stress corrosion cracking – Measures to ensure the integrity of the steam generator tubes (Schäden an Dampferzeuger(DE)-Heizrohren durch Spannungsrisskorrosion – Maßnahmen zur Sicherstellung der Integrität der Heizrohre) (due to new findings in the follow-up to the meeting, the recommendation was revised at the 512th meeting on 22/23.10.2019 and then adopted in the amended version). The recommendation on the permissibility of test and maintenance activities as well as definition of measures for limiting the consequences of events during mid-loop operation (Zulässigkeit von Prüf- und Instandhaltungstätigkeiten sowie die Festlegung von Maßnahmen zur Ereignisbeherrschung bei Mitte-Loop-Betrieb) was also discussed and adopted. The recommendation on assessing the effectiveness of measures to prevent recurrence of events (Bewertung der Wirksamkeit von Maßnahmen zur Vermeidung der Wiederholung von Ereignissen) was discussed and will be discussed again after revision.