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Forwards 740102 memo re failure of control rods to move to full-in position on scram.

Accession Number: ML20090E243

Date Released: Sunday, November 8, 2020

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• ML20090E238 - Forwards 740102 memo re failure of control rods to move to full-in position on scram. (1 page(s), 1/14/1974)
• ML20090E245 - Discusses licensee rept re failure of 11 to 15 control rods to move to full-in position on scram.Failure probably due to fine grit that penetrates screens installed in drive mechanism.General failure unlikely. (1 page(s), 1/2/1974)
• ML20090E273 - Provides addl info clarifying apparent cause of AOs reported on 731128 & 1203 re failure of control rods to insert to full-in position following reactor scram.Adequate shutdown margin exists w/all control rods in Position 02. (4 page(s), 12/21/1973)
• ML20090E274 - Submits transfer of lead responsibility re evaluation of 731120 & 26 failure of control rods to insert fully during scram. (2 page(s), 12/18/1973)
• ML20090E285 - Confirms licensee commitment to complete action correcting causes of failure of 11 to 15 control rods to insert fully. (2 page(s), 12/18/1973)
• ML20090E293 - AO 73-11-29:on 731126,15 control rod drives failed to insert to Position 00 following reactor scram.Caused by leakage past stop piston seals. (1 page(s), 12/3/1973)