Home > NRC Library > ADAMS Public Documents

Lists principal lessons learned through experience at Oyster Creek Reactor re vessel repair.Lessons should not be forgotten.

Accession Number: ML19289B326

Date Released: Saturday, November 7, 2020

Package Contents

The following links on this page are to Adobe Portable Document Format (PDF) files. To obtain a free viewer for displaying this format, see our Plugins, Viewers, and Other Tools.

• ML20084C698 - "Div of Compliance Monthly Rept,Nov 1967." (1 page(s), 11/30/1967)
• ML20084C814 - Forwards G Reinmuth 671027 memo re crack in stub tube weld pressure vessel.Applicant conducting active investigation w/scope of problem to be defined by 671030.Site visit planned for 671031 to review & evaluate status of problem. (1 page(s), 10/27/1967)
• ML20084C276 - Forwards rept of deficiencies in pressure vessel internals at Oyster Creek & Nine Mile Point plants. (3 page(s), 5/24/1968)
• ML20084C467 - Forwards GW Reinmuth 680318 memo re status of plant pressure vessel work. (1 page(s), 3/20/1968)
• ML20084C459 - Discusses encl GE 680202 ltr summarizing current status of plant vessel program.Info provided brief & preliminary re nature of stub tube cracks & defective field welds.Any repair work performed prior to review & evaluation is risk. (3 page(s), 3/22/1968)
• ML20084C261 - Informs of special insp planned of GE labs in CA re continuing review of plant stress corrosion cracking problem.Several scheduled insp trips canceled or delayed until after 680701. (1 page(s), 5/29/1968)
• ML20084C331 - Discusses AEC concern over continuation of plant pressure vessel repair program pending further review of info filed w/AEC on 680325.No justification exists for discontinuing present stub tube overlay & field weld work. (2 page(s), 4/9/1968)
• ML20084C426 - Discusses 680329 telcon w/L Reddis,relaying preliminary reactions re util reactor vessel repair program as described in Amend 35 & detailed in repair procedures.Disappointed w/info received.Diagnostic work continuing. (2 page(s), 3/29/1968)
• ML20084C768 - "Director of Regulation Activity Rept 68,671115." (1 page(s), 11/15/1967)
• ML20084C668 - Discusses status of plant vessel problem stress analysis work covering planned fix of stub tubes being performed by C-E covering eight geometrical considerations.Actual repair will not begin until mid-Jan. (2 page(s), 12/22/1967)
• ML20084C196 - Informs of const problems detected at util facilities.Core shroud head & steam separator assemblies are most significant defects involving poor quality welds,missing welds & misalignment of steam separator components. (4 page(s), 6/6/1968)
• ML20084C279 - Forwards GW Reinmuth 680514 memo reporting 680426 & 0508 site visits re status of stub tube repair program. (1 page(s), 5/15/1968)
• ML20084C690 - "Director of Regulation Activity Rept,671207." (1 page(s), 12/7/1967)
• ML20084C502 - Press release discussing GE confirmed trade industry repts that tiny hairline cracks found in parts of two pressure vessel of GE built atomic power plants near Bombay,India. Cracks similar to Oyster Creek cracks. (1 page(s), 2/27/1968)
• ML20084C239 - Forwards Director of Compliance rept re deficiencies in pressure vessel internals at facilities. (3 page(s), 5/31/1968)
• ML20084C800 - Requests submittal of complete & comprehensive rept containing results of investigation re nature of cracks & basis for adequate understanding of origin & proposed procedures for discovering & repairing cracks. (2 page(s), 11/7/1967)
• ML20084C740 - Title page to "Status Rept:Reactor Vessel Repair Program." (1 page(s), 11/22/1967)
• ML20084C221 - Forwards GW Reinmuth 680531 memo reporting 680524 visit to facility re status of stub tube repair program. (1 page(s), 6/4/1968)
• ML20084C616 - Forwards preliminary repts documenting similar & serious QC problems observed at plant const sites.Problems could have broad implications & direct observations by technical specialists necessary. (1 page(s), 2/5/1968)
• ML20084C635 - Provides brief summary,in chronological order,of contacts made w/util re reactor pressure vessel problems experienced at Jersey Central,cracks in stub tubes & faulty stub tube control rod housing field welds. (6 page(s), 12/27/1967)
• ML20084C343 - Forwards GW Reinmuth 680401 memo which provides status of pressure vessel repair program at plant.Info effective on 680328. (1 page(s), 4/2/1968)
• ML20084C523 - Forwards JCAE 680216 ltr transmitting recent util 680209 ltr which in turn encls GE 680202 ltr containing info describing plant repair program. (1 page(s), 2/16/1968)
• ML20084C294 - Notification of Div of Insp 680507 site visit to review insp repts & discuss general situation re pressure vessel problem. (1 page(s), 4/29/1968)
• ML20084C780 - Forwards ltr notifying JCAE of discovery of cracks in seal welds between control rod stub tubes & plant pressure vessel. (1 page(s), 11/8/1967)
• ML20084C642 - Forwards memos re recent problem at plant where cracks found in control rod stub tubes attached to reactor vessel bottom head.Fact that Tarapur Atomic Power Station being built by GE for Indian govt w/similar problems introduced. (1 page(s), 12/27/1967)
• ML20084C352 - Summary of 680329 meeting at Div of Reactor Licensing ofc re whether Parameter,Inc should immediately proceed to obtain & review detailed info on stress calculations concerning plant pressure vessel stub tube problem.Action postponed. (1 page(s), 4/1/1968)
• ML20084C191 - Concludes,following review of info re vessel stub tube repair,that two stub tubes located in Positions S-3 & T-4 of Figure 1 of Amend 35 be released for repair per procedures used for other stub tubes in vessel.Justification encl. (2 page(s), 6/19/1968)
• ML20084C336 - Summary of 680403 meeting w/util,GE,C-E & MPR Assoc re plant vessel repair program.Rept not as complete as expected.Addl info required to complete review. (4 page(s), 4/5/1968)
• ML20084C448 - Discusses concern about possible consequences of undetected steam leak inside containment vessel which arose during review of plant isolation valve design.Clearer estimate of hazard degree obtained through on-site survey. (1 page(s), 3/26/1968)
• ML20084C710 - Forwards 671124 ltr to JCAE providing addl info re cracks in control rod stub tubes in plant pressure vessel.Ltr includes info from 671109 meeting. (1 page(s), 11/24/1967)
• ML20084C568 - Discusses 680214 telcon w/D Rees of util re saving two stub tubes in plant vessel.Unable to fully discuss w/consultants implications of not having two stub tubes preserved.Advises that if timing critical,necessary to obtain info for repair. (1 page(s), 2/15/1968)
• ML20084C573 - Informs of 680213 telcon w/L Reddis of util notifying AEC of receipt of equiment needed to repair stub tubes in plant pressure vessel.Unable to answer question re release of two stub tubes until further discussion. (1 page(s), 2/14/1968)
• ML20084C513 - Proposes listed activities to monitor repairs to plant pressure vessel.Major activities include site visit on weekly basis & procedure review & observation of apparatus to be used in cladding stub tubes. (2 page(s), 2/16/1968)
• ML20084C266 - Forwards info on fabrication of util pressure vessel obtained from C-E,per 680527 request. (3 page(s), 5/29/1968)
• ML20084C704 - Summary of 671122 meeting w/util,GE & C-E re proposed method of repair of defects found in reactor vessel control rod drive stub tubes & associated field weldments. (4 page(s), 11/30/1967)
• ML20084C325 - Forwards list of deficiencies re Div of Compliance insp effort at plant.List as well as other matters concerning plant to be discussed in near future. (1 page(s), 4/18/1968)
• ML20084C205 - Forwards C Nelson 680604 memo re facility 680308 insp & insp procedures. (1 page(s), 6/4/1968)
• ML20084C486 - Forwards two AEC repts discussing pressure vessel stub tube stress situation at plant,for review & comment.Detailed stress rept from licensee will also be forwarded for review. Single rept incorporating all comments sufficient.W/o repts. (1 page(s), 3/15/1968)
• ML20084C182 - Responds to NRC 680625 ltr re release of two remaining stub tubes for repair.Insufficient technical justification exists to phase out tube sample surveillance program.Stub tube repair operation proceeding w/o sample surveillance program. (1 page(s), 6/25/1968)
• ML20084C299 - Forwards preliminary rept on cladding of stub tubes at plant. (1 page(s), 4/19/1968)
• ML20084C259 - Forwards P Patriarca & E Miller opinions on advisability of releasing util to proceed w/repair of two stub tubes presently held untouched for potential tests of unnamed nature,per 680528 telcon.No reason to hold tubes exists. (2 page(s), 5/29/1968)
• ML20084C748 - Forwards Parameter,Inc ltr denying responsibility for any disclosure of info re cracks found in plant control rod stub tubes.Ltr prompted by allegations reported by JC Ryan on 671109.No reason for believing allegations. (1 page(s), 11/22/1967)
• ML20084C215 - Comments on 680508 insp of remedial work being performed on pressure vessel at facility.Insp conducted in thorough & prof manner.Special in-depth QC insps conducted by AEC necessary in special cases. (1 page(s), 6/4/1968)
• ML20084C224 - Status rept of Oyster Creek pressure vessel repair as of 680524 site visit. (3 page(s), 5/31/1968)
• ML20084C284 - Repts status of progress on pressure vessel repair following 680426 & 0508 site visits.Repair continuing as rapidly as work conditions permit w/completion expected by mid-June. (3 page(s), 5/14/1968)
• ML20084C304 - Forwards preliminary documentation on problem areas noted during 680417 insp re cladding of stub tube as part of pressure vessel repair. (1 page(s), 4/19/1968)
• ML20084C313 - Status rept covering repairs to reactor pressure vessel obtained during 680417 visit. (3 page(s), 4/19/1968)
• ML20084C348 - Discusses Oyster Creek pressure vessel repair status obtained during 680328 site visit. (2 page(s), 4/1/1968)
• ML20084C476 - Discusses Oyster Creek pressure vessel work status.Info obtained during 680307-08 site visit. (2 page(s), 3/18/1968)
• ML20084C532 - Transmits util 680209 ltr which encls GE 680202 rept summarizing current status of plant pressure vessel problem. Info brief & preliminary re stub tube cracks & defective field welds. (1 page(s), 2/16/1968)
• ML20084C552 - Forwards summary of plant vessel repair program to be developed into GE repair program & submitted within one month as amend. (6 page(s), 2/9/1968)
• ML20084C621 - Inquiry Memo 219/68-A re new info on stub tubes & in-core instrumentation thimbles obtained through 680122 & 23 telcons w/GE site representatives.Inquiry prompted by info obtained informally during Jan ACRS meeting. (6 page(s), 1/24/1968)
• ML20084C648 - Responds to M Shaw request to determine if problem similar to Oyster Creek re cracking of control rod stub tubes exists at Tarapur Atomic Power Station in Bombay,India since both are built by GE.No cracks detected at Tarapur plant. (3 page(s), 12/20/1967)
• ML20084C730 - Provides current info re cracks in plant control rod stub tubes addressed in 671107 ltr.Info still preliminary but certain addl facts ascertained from further investigation by Div of Compliance visits to site. (3 page(s), 11/24/1967)
• ML20084C761 - Clarifies participation at ANS Chicago,IL meeting.No employees or consultants registered nor attended any formal sessions sponsored by ANS or AIF.Not responsible for disclosure of info. (3 page(s), 11/16/1967)
• ML20084C794 - Describes current problem re detection of small leak from one of 137 control rod guide tubes.Problem may cause delay in const.Further exam of other stub tube welds revealed positive indications of addl surface cracking. (4 page(s), 11/7/1967)
• ML20084C823 - Discusses info obtained during 671025-26 site visit re leak in plant pressure vessel.Possible cause of cracking could be differential expansion & contraction of stub tube resulting from field weld of rod guide tube. (2 page(s), 10/27/1967)