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Partial response to FOIA request for all internal documents re IE Info Notice 86-005 & operability of main steam safety valves.Encl App A documents available in PDR.App B documents being placed in PDR.

Accession Number: ML20151L176

Date Released: Friday, July 31, 2020

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• ML20198E649 - Partial response to FOIA request for all internal documents re IE Info Notice 86-005 & operability of main steam safety valves.Encl App A documents available in PDR.App B documents being placed in PDR. (7 page(s), 5/8/1986)
• ML20198E709 - Forwards util 850117 interim deficiency rept re Crosby main steam safety valve ring settings.Reviews of issue requested along w/judgement re whether issue generic. (1 page(s), 5/8/1986)
• ML20151L207 - Lists tasks planned by Mechanical Engineering Branch which respond to 850723 briefing request to investigate adequacy of PWR main steam safety valve testing & value of extrapolating test data from small valves. (4 page(s), 9/27/1985)
• ML20198E699 - Submits daily highlights.On 851126,meeting will be held w/ util to discuss return to svc in light of recent main steam safety valve setpoint problems. (27 page(s), 5/8/1986)
• ML20198E724 - Forwards listed addl documentation re util 850117 interim deficiency rept concerning main steam safety valve ring settings.W/o encl. (2 page(s), 1/27/1985)
• ML20198E798 - Informs that 850716 NRR Operating Reactor Events Briefing 85-12 rescheduled for 850723 in Bethesda,MD.Agenda encl. (10 page(s), 5/8/1986)
• ML20198E674 - Submits listed tasks developed by Mechanical Engineering Branch to respond to 850723 operating reactor events briefing re inadequate capacity of main steam safety valves at facility. (17 page(s), 5/8/1986)
• ML20151L171 - Forwards proposed IE info notice describing failures of Crosby PWR main steam safety valves to attain full disc lift during full flow tests performed at Wyle Labs. Recommends proposed notice be issued. (5 page(s), 9/9/1985)
• ML20198E704 - Submits daily highlight.NRC notified that two main steam safety valves repeatedly delayed to reseat after two reactor trips.Cause unknown.Investigation continuing.Unit returned to power. (2 page(s), 1/23/1985)
• ML20198G507 - Discusses review of safety implications of main steam safety valve from deficiency,per 851021 meeting.Doubt exists that all safety valves would serve intended safety function,based on limited info re secondary side safety valves. (15 page(s), 11/22/1985)
• ML20198E762 - Informs of next NRR operating reactor events briefing scheduled for 850716 in Bethesda,MD.Guidelines for participants encl.Tentative agenda for meeting listed. (22 page(s), 5/8/1986)
• ML20199F532 - Recommends that NRC headquarters advise licensees of potential generic issues re ring settings of Crosby safety valves & requests licensees to verify that steam generator safety valves have full lift. (2 page(s), 6/10/1985)
• ML20198E744 - "Test Rept for Full Flow Testing of 16,18 & 20-Inch Main Steam Safety Valve Vent Stacks for Yankee Atomic Electric Co." (55 page(s), 1/10/1985)
• ML20198E681 - Discusses safety implications & potential consequences of main steam safety valve flow deficiency.Facility experience shows deficiency in capacity adjustment of Crosby spring- loaded safety valves. (15 page(s), 5/8/1986)