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Ack receipt of 790502 ltr forwarding 10CFR50.55(e) rept re 4 kV bus differential protection.Rept will be reviewed & evaluated.

Accession Number: ML18079A631

Date Released: Sunday, November 8, 2020

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• ML18079A630 - Ack receipt of 790502 ltr forwarding 10CFR50.55(e) rept re 4 kV bus differential protection.Rept will be reviewed & evaluated. (1 page(s), 6/14/1979)
• ML18079A632 - Discusses significant deficiency re 4 kV vital bus differential protection caused by relay plunger mechanism which is susceptible to seismic vibration.Spurious relay operation could cause loss of all 4 kV buses. (3 page(s), 5/2/1979)