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Partial response to FOIA request for documents.Category 1 documents subj to request encl.

Accession Number: ML20209J032

Date Released: Tuesday, August 11, 2020

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• ML20210B037 - Responds to AEC 721213 questions re torus ring header & forwards Special Rept 31, "Torus Ring Header Support Mod," describing ring header insps & repairs. (4 page(s), 7/11/1973)
• ML20209J102 - Forwards addl info re relief valve blowdowns at facility, per 740307 request.Info suppls data previously submitted on 740118 & 0207. (2 page(s), 4/15/1974)
• ML20210B424 - Discusses AEC 721213 request for addl info re facility torus header support design.Items 1-3 will be available in Mar 1973 when GE analysis completed.Listed repairs corrected deficiencies in sys as reported in 720705 & 1206 ltrs. (2 page(s), 1/12/1973)
• ML20210B312 - Notifies that tests to verify adequacy of torus suction header supports during relief valve blowdown into torus will start on 721019 & terminate on 721020.Branch participation in observing tests requested. (1 page(s), 10/10/1972)
• ML20210B262 - Trip rept of 721019 visit to plant to investigate ring header problem & observe GE blowdown tests. (2 page(s), 10/25/1972)
• ML20210A410 - Submits Technical Request ORB-2-42 for review of encl draft, "Torus Ring Header Rept." On 720529,four hanger bolts for torus section header on Unit 2 failed during startup tests. Corrective actions not adequate to prevent header failure. (38 page(s), 10/13/1972)
• ML20210B269 - Informs that rept on relief valve blowdown test program will be transmitted by 730514.Static & dynamic analysis performed to determine behavior of torus during relief valve piping clearing transient & conclusions discussed. (2 page(s), 4/30/1973)
• ML20210A522 - Discusses licensees responses to Operations Bulletin 72-1 re hangar failure on torus suction header.AEC action should be deferred until util submits rept on post-repair tests performed on facility torus & header sys. (1 page(s), 9/20/1972)
• ML20210A720 - Rev 3 to startup test instruction, "Torus Transient Pressure Wave Test." Related info encl. (66 page(s), 10/17/1972)
• ML20210B140 - Forwards request for addl info needed to complete evaluation of "Quad Cities Station Special Rept 5,Torus Ring Header Support Failure," including summary of dynamic analysis of torus ring header sys subjected to blowdown forces. (2 page(s), 11/9/1972)
• ML20210B073 - Special Rept 31, "Torus Ring Header Support Mod." (18 page(s), 7/31/1973)
• ML20209J414 - Forwards details on relief valve operation at facility in response to Part 1 of 731219 ltr.Relief valves equipped w/separate discharge line to torus terminating in rams-head as discussed in 730718 telcon. (3 page(s), 1/16/1974)
• ML20209J362 - Forwards summary of electromagnetic relief valve operation at facility from Jan-Dec 1969,per Item 1 of 731219 request. Future relief valve operation will be reported in facility semiannual operating repts. (6 page(s), 1/18/1974)
• ML20210B193 - Requests comments on encl rept re torus ring header hanger failure by 721127. (1 page(s), 11/6/1972)
• ML20209J450 - Responds to 731219 request for addl info re dynamic effects of relief valve blowdowns in torus chamber.Summary of all electromatic relief valve actuations at facility encl. Proposed Tech Spec change will be submitted by 740219. (3 page(s), 1/18/1974)
• ML20209J504 - Forwards info re relief valve operation at facility,per Item 1 of 731219 request.In response to Item 2,licensee has proposed Tech Specs change re refueling outage torus insp, pending,therefore,no addl changes necessary. (5 page(s), 1/30/1974)
• ML20210B233 - Notification of 721102 & possible 721103 meeting w/GE to discuss torus ring header hangers failure,design descriptions,test program,design alteration considerations & program schedule.Proposed agenda encl. (2 page(s), 10/27/1972)
• ML20210A585 - Discusses event re loss of ECCS suction header support bolts at facility.Final evaluation will be performed after Technical Review examines util test rept.Related info encl. (5 page(s), 8/29/1972)
• ML20210A454 - Documents 740104 telcon between util & FJ Williams & JF Stolz of NRC re history & present status of torus problem & steps being taken.Drawing of torus & torus ring header encl. (9 page(s), 4/28/1987)
• ML20210A633 - Draft "Failure of Hanger Bolts on Suppression Chamber Suction Header at Quad Cities Nuclear Station Unit 2...," preliminary investigation rept.Related info encl. (75 page(s), 6/22/1972)
• ML20209J428 - Annotated memo re proposed program for verification of BWR torus capability,per GE plant-specific analytical model for Quad Cities Unit 2.Means of verification for remaining listed plants needed,based on tests at Browns Ferry Unit 1. (2 page(s), 2/21/1974)
• ML20210A365 - Forwards summaries of operating history of electromagnetic relief valves,per 731219 request.Summaries include date,type of operation & circumstances for each valve listed.Response to second request will be submitted by wk of 740218. (7 page(s), 1/21/1974)
• ML20210B376 - Trip rept of 721218 site visit re jet pump assembly & torus ring header sys.Dynamic analysis & measured data not available.Results & findings will be described in rept scheduled for 730302. (1 page(s), 12/29/1972)
• ML20210A204 - Comments on TVA "1973 Browns Ferry Unit 2 Torus Experience," per 740521 request.Rept deficient in five listed areas. Validity of method employed in determining adequacy of torus structure,present or modified,not justified. (4 page(s), 6/26/1974)
• ML20210B165 - Forwards outline for rept re torus suction header,per commitment made at 721102 meeting. (4 page(s), 12/18/1972)