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Further response to FOIA request for several categories of documents re pressure suppression containment.FSAR & SER for Limerick only documentation re 4x4 tests.Encl Apps D-G documents responsive to Item 4 also available in PDR.

Accession Number: ML20140F372

Date Released: Tuesday, June 2, 2020

Package Contents

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• ML20140G336 - Recommends that licensees visually check BWR relief valve discharge piping for damage based on damage found in Duane Arnold relief valve/torus regions. (2 page(s), 7/22/1975)
• ML20140G361 - Forwards pages from ASLAB 771123 Decision ALAB-444 re NRR technical activities program.Draft write-up of justification for continuation of licensing &/or operation of nuclear plants requested by 771215.Format sample encl. (22 page(s), 12/7/1977)
• ML20140G259 - Trip rept of 760529 site visit re witness of safety/relief valve tests.List of attendees encl. (4 page(s), 6/15/1976)
• ML20140G497 - Summary of 780119 meeting w/Mark II Owners Group,GE & BNL re status of safety-relief valve related loads on Mark II containment.Meeting agenda,attendee list & presentation matls encl. (146 page(s), 2/9/1978)
• ML20140F593 - PNO-77-022:on 770204,reactor scrammed when torus temp increased to 110 F.Caused by two Target Rock safety/relief valves opening w/o reseating until pressure decreased to 100 psig.Reactor placed in cold shutdown. (1 page(s), 2/4/1977)
• ML20140F512 - Forwards Containment Sys Branch input to draft SSER 2 & request for addl info.Areas of concern from review of "Unsteady Drag on Submerged Structures" listed.Meetings w/ GE planned to discuss impact load profiles. (6 page(s), 12/28/1976)
• ML20140G514 - Forwards staff position on assessment of multiple-subsequent safety-relief valve actuations & KR Goller draft memo forwarding sample ltr to licensees.Observations of transient analyses provided. (11 page(s), 1/5/1978)
• ML20140F981 - Forwards request for info re EBASCO containment structures design rept,per 750530 request.Info for assessing design adequacy of piping & mechanical components affected by suppression pool dynamic loadings needed. (2 page(s), 6/16/1975)
• ML20140G286 - Forwards proposed Tech Spec changes to License DPR-59, revising suppression pool water temp limits,per NRC 750213 ltr,for review.Changes will be effective unless notified within 20 days of ltr date.Safety evaluation also encl. (8 page(s), 7/15/1975)
• ML20140F516 - Comments on action described in util 770110 ltr re 761124 test of safety/relief valve (SRV) to discharge sys. Staggering actuation of three SRVs connected to common header could create more severe load case. (8 page(s), 2/18/1977)
• ML20140G175 - Forwards draft generic ltr requesting applicants of plants w/Mark III type containments to describe design provisions to accommodate loads in suppression pool. (5 page(s), 4/10/1975)
• ML20140F770 - Topical rept evaluation of NEDO 10859, "Steam Vent Clearing Phenomena & Structural Response of BWR Torus." Portion of rept re structural response & stress analysis unacceptable. Viewgraphs encl. (26 page(s), 9/12/1974)
• ML20140F505 - Advises that GE intends to review proposed program for generic resolution of loading criteria for submerged structures w/owners groups before responding to 770105 request.Date of response will be submitted by 770228. (1 page(s), 1/18/1977)
• ML20140G325 - PNO-74-136:on 741124,during startup tests of main steam relief valves at 75% power,Target Rock safety relief valve failed to reseat.Cause not stated.Valve will be replaced. (3 page(s), 11/27/1974)
• ML20140G343 - PNO-75-053:on 750720,during attempt to reseat leaking relief valve D,valve manually actuated & did not reseat.Reactor manually scrammed.Investigation continuing. (35 page(s), 7/21/1975)
• ML20140G253 - Trip rept of 760614-17 site visits re relief valve test sequence.Test results encl. (4 page(s), 6/28/1976)
• ML20140G573 - Safety evaluation supporting Tech Spec changes to License DPR-59 to revise suppression pool water temp limits. (3 page(s), 7/15/1975)
• ML20140G330 - Advises that GE will develop design for positive leakage control sys,upgrade piping sys to Seismic Category I & identify containment water legs & loop seals which perform sealing function,per Reg Guide 1.3. (18 page(s), 9/26/1975)
• ML20140F750 - Forwards topical rept evaluation of NEDO 10859, "Steam Vent Clearing Phenomena & Structural Response of BWR Torus." Rept unacceptable for predicting fluid phenomena in torus water due to relief valve actuation. (1 page(s), 9/12/1974)
• ML20140G264 - Summary of 760921 meeting w/GE & INEL in Bethesda,MD re areas of concern developed during review of safety relief analytical model described in NEDE-20942-P.Attendance list encl. (4 page(s), 10/4/1976)
• ML20140F546 - Forwards responses to NRC 770105 questions re "Unsteady Drag on Submerged Structures" submitted by GL Gyorey 760324 ltr. Drafts of documents for eventual use in load definition guidelines being prepared. (4 page(s), 3/2/1977)
• ML20140G538 - Forwards test plan for Mark I containment program in-plant safety/relief valve discharge load test w/T-quencher to be performed at plant,per 770824 & 25 meeting rept request. (20 page(s), 11/4/1977)
• ML20140F559 - Summarizes discussions held on safety/relief valve loading during 770216 & 17 meetings w/GE,MARK II Owners Group & BNL in San Jose,CA.Monticello test results & analytical model verification areas of concentration. (13 page(s), 3/3/1977)
• ML20140G549 - Advises that more frequent testing of BWR relief & safety- relief valves warranted due to continuing failures. Description of long-range program,including sample ltr w/Tech Specs,provided. (12 page(s), 7/20/1977)
• ML20140F580 - Advises that GE 770303 conclusions that leaking safety/relief valves would result in lower loads on structures than first actuation w/o leakage unjustified,for listed reasons. (2 page(s), 6/6/1977)
• ML20140F788 - Forwards draft generic ltr requesting applicants of plants w/Mark II type containments to describe design provisions to accommodate loads in suppression pool due to operation of primary sys pressure relief valves. (32 page(s), 4/10/1975)