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AO 73-11-20 on 731120,11 control rods failed to insert to Position 00 following scram.Caused by damaged stop piston seals resulting in excessive leakage.Rods will be overhauled.

Accession Number: ML20090E309

Date Released: Monday, April 13, 2020

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• ML20090E307 - AO 73-11-20 on 731120,11 control rods failed to insert to Position 00 following scram.Caused by damaged stop piston seals resulting in excessive leakage.Rods will be overhauled. (2 page(s), 11/28/1973)
• ML20090E313 - AO 73-11-20:on 731120,during routine startup,11 control rod drives failed to insert to Position 00 following high flux scram.Caused by damaged stop piston seals resulting in excessive leakage.Control rods will be overhauled. (2 page(s), 11/28/1973)