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Recommends Directorate of Licensing assist in response to Swiss regulatory group inquiry info cracking of feedwater spargers.GE sparger review incomplete.

Accession Number: ML19289B417

Date Released: Friday, October 25, 2024

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• ML20085C262 - Recommends Directorate of Licensing assist in response to Swiss regulatory group inquiry info cracking of feedwater spargers.GE sparger review incomplete. (1 page(s), 3/8/1974)
• ML20085C273 - Requests recommendations to be presented to Swiss re request for info on cracks in feedwater spargers.Recommendations requested by 740308. (1 page(s), 2/23/1974)
• ML20085C280 - Requests info on cracks in feedwater spargers,including possible causes,possible design mods,removal/installation of spargers & any tests planned. (4 page(s), 2/20/1974)
• ML20085C288 - Discusses GE study of feedwater sparger cracks.Relationship exists between thermal sleeve/nozzle leakage & sparger vibration.GE recommendations made to listed BWR owners. (4 page(s), 1/28/1974)
• ML20085C300 - Submits addl info on experience re personnel radiation exposure associated w/feedwater sparger repair work.Addl measures would not have significant effect in reducing total man/rem exposure. (3 page(s), 10/22/1972)
• ML20085C304 - Forwards proprietary ltr rept re vibration measurements of installed sparagers. (1 page(s), 8/20/1973)
• ML20085C307 - Presents main findings of preliminary feedwater sparager review.Concept of feedwater sparger preload disproved by plant failures. (12 page(s), 8/17/1973)
• ML20085C314 - Informs that Directorate of Licensing will retain lead responsibility to determine adequacy of present feedwater sparger design & of attachment to reactor vessel. (2 page(s), 8/14/1973)
• ML20085C318 - Advises that 730612 feedwater sparger rept & 730629 App 1 reviewed.No welding repair procedures or other documents submitted to Directorate of Regulatory Operations. (1 page(s), 8/8/1973)
• ML20085C327 - Requests addl info on personnel exposure during feedwater sparger repair work.Number of personnel exposed,techniques used to reduce exposure,future techniques & estimate of man/rem dose reduction should be discussed. (2 page(s), 8/2/1973)
• ML20085C335 - Forwards analysis of util 730629 feedwater sparger rept. (1 page(s), 7/13/1973)
• ML20085C342 - Agrees w/util that cause of failure of feedwater spargers was high cycle fatigue arising from vibration of sparger arms in response to some undetermined hydraulic turbulence in sys. (2 page(s), 7/6/1973)
• ML20085C347 - Authorizes plant return to svc consistent w/info in 730612 & 29 ltrs & w/listed condition. (3 page(s), 7/12/1973)
• ML20085C357 - Safety evaluation of feedwater sparger problem & return to power operation.Proposed changes in 730711 ltr acceptable. Plant can be restarted. (6 page(s), 7/12/1973)
• ML20085C368 - Forwards special rept on feedwater sparger failure, presenting findings & future plans.Depth of analysis sufficient to provide increased confidence in adequacy of latest feedwater sparger design.W/o encl. (1 page(s), 6/12/1973)
• ML20085C378 - Advises of recent findings re feedwater spargers.Northeast & northwest feedwater spargers found cracked in tree box area.Hairline cracks found in southwest feedwater sparger. (1 page(s), 5/21/1973)
• ML20085C384 - Advises that plant feedwater sparger problem action code FO-47 closed out by NRC 730508 memo to DJ Skovholt. (1 page(s), 5/9/1973)
• ML20085C390 - Provides significant new info re cracks in feedwater spargers.Cracking was brittle & found in areas of residual & applied stress concentrations. (3 page(s), 5/8/1973)
• ML20085C400 - Recommends Directorate of Licensing be requested to notify util of plant shutdown until cause of redesigned sparger failure identified & reviewed.Future surveillance insp frequency should be reduced. (2 page(s), 4/30/1973)
• ML20085C415 - Forwards drawings & photographs re cracked feedwater spargers,as followup to 721103 memo.W/o encl. (1 page(s), 11/13/1972)
• ML20085C418 - Trip rept of visit to San Jose,CA & Vallecitos,CA re plant feedwater sparger exam.GE investigation satisfactory. Cracking mechanism seems to be related to fatigue &/or stress corrosion. (2 page(s), 11/15/1972)
• ML20085C422 - Forwards drawings & photographs re cracked feedwater spargers.W/o encl. (1 page(s), 11/10/1972)
• ML20085C424 - Summarizes status,as of 721101,re util & GE investigations re chloride contamination problem & cracked feedwater spargers.Preliminary info on metallurgical studies by GE expected on 721103. (2 page(s), 11/3/1972)
• ML20085C428 - AO 72-26:two feedwater spargers found to have circumferential cracks.No cause stated.Investigation continues to ascertain actual condition of all spargers so new spargers can be fabricated to avoid problems. (1 page(s), 10/21/1972)
• ML20085C431 - AO 72-24:on 720925,crack in 18-inch header found during leak testing of atmospheric control sys valves.Cause unknown. Investigation continuing. (1 page(s), 10/4/1972)
• ML20085C435 - AO 72-24:on 720925,crack in 18-inch header found during leak testing of atmospheric control sys valves.Cause unknown. Investigation continuing. (1 page(s), 9/26/1972)