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Forwards LER 99-001-01,which supplements original LER by clarifying that safety function of low pressure ECCS was not lost when redundant loops of RHRS LPCI mode were inoperable. Suppl also provides update to corrective actions.

Accession Number: ML17164B030

Date Released: Monday, September 18, 2017

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• ML17164B029 - Forwards LER 99-001-01,which supplements original LER by clarifying that safety function of low pressure ECCS was not lost when redundant loops of RHRS LPCI mode were inoperable. Suppl also provides update to corrective actions. (2 page(s), 5/3/1999)
• ML17164B031 - LER 99-001-01:on 990228,determined that plant has been operated for approx 17 h on 990216 with both loops of LPCI mode of RHRS inoperable.Caused by environmentally assisted stress corrosion cracking.Valve stem/disk was replaced. (11 page(s), 5/3/1999)