Information Notice No. 86-81, Supplement 1:Broken External Closure Springs on Atwood & Morrill Main Steam Isolation Valves
… Springs on Atwood & Morrill Main Steam Isolation Valves … UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF NUCLEAR REACTOR REGULATION WASHINGTON, D.C. 20555 January 11, 1988 Information Notice No. 86-81, … steam isolation valves (MSIVs) that have been reported at Fermi Unit 2. The MSIVs were manufactured by Atwood & …