Letter Sequence Other |
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Results
Other: A800039, Updates Re Status of Mark I Containment Program Mods.Installation of Torus Miter Joint Saddles,Mod of Torus Internal Structures & Mod of 45 Piping Supports on Discharge Lines Will Be Completed by Sept 1981, A800046, Submits Modified Completion Schedule Resulting from Discussions & Changes in Contractor Assistance to Effect Mod.Drywell & Torus Mods Will Be Completed Before 820430. Completion Date Five Months Sooner than Previous Schedule, A830023, Summarizes Completed Corrective Action on Mark I Mod Welds Installed by Unqualified Welders.Welds Examined & Modified If Needed, ML19276E697, ML19276E708, ML20024C089, ML20024C281, ML20032B076, ML20052C074, ML20063F922, ML20064J580, ML20077D120, ML20084L117
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MONTHYEARML20127A4681978-03-0101 March 1978
Summary of 771129 Meeting W/Mark I Owners Group & GE in San Franciso,Ca Re Listed Topics,Including Results & Bases for long-term Program Decision Point 3.List of Attendees & Viewgraphs Encl
Project stage: Meeting
ML19276E7081979-03-0101 March 1979
Directs Recipients to Send Encl Sample Ltrs to BWR Mark I Facilities Requesting Schedules & Commitments Re Expected Mod Completion Dates,Use of Safety Relief Valve Discharge Devices & Licensing Fees for long-term Program
Project stage: Other
ML19276E6971979-03-0101 March 1979
Forwards Proposed Staff Position for Mark I long-term Program Implementation Schedules
Project stage: Other
A800039, Updates Re Status of Mark I Containment Program Mods.Installation of Torus Miter Joint Saddles,Mod of Torus Internal Structures & Mod of 45 Piping Supports on Discharge Lines Will Be Completed by Sept 19811980-08-14014 August 1980
Updates Re Status of Mark I Containment Program Mods.Installation of Torus Miter Joint Saddles,Mod of Torus Internal Structures & Mod of 45 Piping Supports on Discharge Lines Will Be Completed by Sept 1981
Project stage: Other
A800046, Submits Modified Completion Schedule Resulting from Discussions & Changes in Contractor Assistance to Effect Mod.Drywell & Torus Mods Will Be Completed Before 820430. Completion Date Five Months Sooner than Previous Schedule1980-10-0606 October 1980
Submits Modified Completion Schedule Resulting from Discussions & Changes in Contractor Assistance to Effect Mod.Drywell & Torus Mods Will Be Completed Before 820430. Completion Date Five Months Sooner than Previous Schedule
Project stage: Other
ML19341B1831981-01-13013 January 1981
Order Granting Extension to Exemption from General Design Criterion 50 & Requiring Licensee to Reassess Containment Design for Suppression Pool Hydrodynamic Loading
Project stage: Approval
ML20032B0761981-10-26026 October 1981
Summarizes Key Decision at Variance w/NUREG-0661,App a Acceptance Criteria Re Mark I Containment Mod & Analysis Approach.Util Proposes to Address Issue by Installing Required Hardware Mods in Timely Fashion
Project stage: Other
ML20052C0701982-04-29029 April 1982
Forwards Plant Unique Analysis Rept:Mark I Containment Program. Planning & Procurement for Final Mods in Progress. Completion Expected by 820930.Formal Request for OL Change Will Follow May 1982 Refueling Outage
Project stage: Request
ML20052C0741982-04-30030 April 1982
Plant Unique Analysis Rept:Mark I Containment Program
Project stage: Other
ML20063F9221982-08-23023 August 1982
Requests That 820930 Order Date for Completion of Mark I Containment Program Mods Be Changed to Spring 1983 Refueling Outage to Complete Remaining Work on Torus Temp Monitoring Sys
Project stage: Other
ML20024C0891982-11-0505 November 1982
Submits Updated Progress Rept & Corrective Actions Re Mark 1 Mod Program Steel Plate Problem.Rework on 70 Supports Planned.Final Assessment of Matl Testing Will Be Completed & Reported in 821203 Progress Rept
Project stage: Other
ML20064J5801982-11-0808 November 1982
Part 21 Rept Re Matl That May Not Be in Compliance W/ 10CFR50,App B,Section Viii Requirements.Matl Supplied to Ne Public Power District & Omaha Public Power District.Qa Depts Contacted Re Resolution of Nonconformance Situation
Project stage: Other
ML20028B8991982-12-0101 December 1982
Responds to Franklin Research Ctr 821029 Request for Info Re Plant Unique Analysis Rept Concerning Mark I Containment Program.All Small & Large Bore Piping Associated W/Containment Sys Considered in Evaluations
Project stage: Request
ML20024C2811982-12-0303 December 1982
Submits Final Results & Corrective Actions Re Steel Plate Problem Involving Mark I Mod program.Macro-etching Results Completely Acceptable.Physical Properties Acceptable W/Three Exceptions.Test Results Resolve Concerns Re Traceability
Project stage: Other
ML20077D1201983-04-13013 April 1983
Informs That While Reviewing QA Documentation & Work Packages Provided by Dravo Util Constructors,Inc for Mark I, Penetration Welds Performed by Unqualified Welders.Ge NDT Personnel Will Examine Welds Beginning 830418
Project stage: Other
ML20023B4791983-04-29029 April 1983
Application to Amend License DPR-46,extending Mark I Program Completion Date for 90 Days for Weld Repair.Class II Amend Fee Forwarded
Project stage: Request
A830015, Forwards Responses to Apr 1983 Request for Info Re Mark I Containment long-term Program - plant-unique Analysis Rept Loads Evaluation (NEDE-24840)1983-06-0202 June 1983
Forwards Responses to Apr 1983 Request for Info Re Mark I Containment long-term Program - plant-unique Analysis Rept Loads Evaluation (NEDE-24840)
Project stage: Request
ML20080C1471983-08-17017 August 1983
Audit for Mark I Containment Long-Term Program Structural Analysis for Operating Reactors, Supplementary Technical Evaluation Rept
Project stage: Supplement
A830023, Summarizes Completed Corrective Action on Mark I Mod Welds Installed by Unqualified Welders.Welds Examined & Modified If Needed1983-10-0707 October 1983
Summarizes Completed Corrective Action on Mark I Mod Welds Installed by Unqualified Welders.Welds Examined & Modified If Needed
Project stage: Other
NLS8400137, Application to Amend License DPR-46,consisting of Proposed Change 13,revising Tech Specs to Incorporate Mark I Containment Mods,Per NRC 840120 Request.Class III Amend Fee Encl1984-05-0707 May 1984
Application to Amend License DPR-46,consisting of Proposed Change 13,revising Tech Specs to Incorporate Mark I Containment Mods,Per NRC 840120 Request.Class III Amend Fee Encl
Project stage: Request
ML20084L1171984-05-0707 May 1984
Proposed Tech Specs,Incorporating Mark I Containment Mods
Project stage: Other
ML20212A8241986-07-24024 July 1986
Structural Evaluation of Vacuum Breakers (Mark I Containment Program),Cooper Nuclear Station, Supplementary Technical Evaluation Rept
Project stage: Supplement
1982-12-03
[Table View] |
Text
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Nebraska Public Power District
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November 5,1982 Mr. John T. Collins gg g] g ];
Regional Administrator
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U.S. Nuclear Regulatory Commission is t y
Region IV g
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i 611 Ryan Plaza, Suite 1000 Arlington, Texas 76011 L
Dear Mr. Collins:
Subject:
Mark I Modification Steel Problem Investigation Progress Report Cooper Nuclear Station NRC Docket No. 50-298, DPR-46
Reference:
(1)
J. M. Pilant to John T. Collins, LQA8200192, dated October 11, 1982 (2)
J. M. Pilant to John T. Collins, LQA8200199, dated October 20, 1982 By the referenced letters, NPPD has identified and reported on a steel plate problem concerning the Mark I Modification Program.
The investigation is still in progress and the purpose of this letter is to provide an updated progress report and indicate the corrective actions planned to date.
I. INTRODUCTION Reference (2) was the initial status report on the steel plate problem.
The problem was determined to be the use of certain plate material in the Torus Attached Piping (TAP) supports which did not meet the specifications for A-36 steel. In addition, it was identified that the steel vendor, Paxton and Vierling Steel Company (PVS) had not maintained the required material traceability. The initial review indicated there was j
no short-term concern for plant safety resulting from the use of the material. Plans were outlined for further assessment of the situation and for identifying necessary corrective actions.
II. CURRENT STATUS l
In order to resolve the questions raised by the lack of material trace-l ability by the steel vendor, Reference (2) indicated that samples of available material would be tested to determine their properties for comparison with the A-36 requirements.
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',. Mr. John T. Collins
. - Page 2 November _5,1982 Review of the A-36 and accompanying A-6 testing requirements indicated that chemical, physical, and macro-etching tests would be necessary to demonstrate acceptability of the material.
Samples of 30 plate and shaped items were sent for laboratory testing.
Preliminary reports received to date on physical and chemical tests show the ~ properties meet the requirements of A-36 steel. Pending receipt of the final report on all tests (including macro-etching) it can be con-cluded that the material is acceptable for installation in the plant.
The question of the use of the laminated plate in 85 pipe supports has been under evaluation since the first status report. The initial review of the application of this material and results of special tests to determine the load capabilities of the laminated plate indicated that the material could possibly be justified for installation.
However, the decision has been made to replace all structural members fabricated from 1/2" plate with the PVS identifier P-5637.
Structural reevaluations are presently being documented in the calculation files to justify that any nonload bearing material left in the supports does not adversely impact the support.
There are 75 supports to be reworked to remove the laminated material and 10 supports justified as is.
III. FUTURE ACTIVITIES Rework on 70 of the supports mentioned above is currently scheduled to be started during the week of November 8,1982.
Completion of this effort is anticipated during December 1982.
The remaining 5 support packages are installed in the torus; these items will be reanalyzed.
The final assessment of the material testing will be completed and reported in the next progress report to be submitted on December 3, 1982.
Should you have any further questions or comments, please contact me.
l Sincerely, l
Mr Jay
. Pilant Division Manager of Licensing and Quality Assurance JMP/rdb:rjd5/8 l
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