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] |
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- S Nebraska Public Power District December 3,1982 Mr. John T. Collins Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza, Suite 1000 Arlington, Texas 76011
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 (3)
J. M. Pilant to John T. Collins, dated November 5,1982 By the referenced letters, NPPD has identified and reported on a steel plate problem involving the Mark I Modification Program.
The investigations and testing programs for the evaluation of this problem have been completed.
The purpose of this letter is to identify the final results and corrective actions.
I.
INTRODUCTION References (2) and (3) defined the scope of the problem and reported on the various stages of the evaluation process.
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.
Evaluations indicated there was no short-term concern for plant safety resulting from this problem.
Plans were outlined for resolving the problem and identifying necessary corrective actions.
II.
CURRENT STATUS There are a total of 45 different items on the subject TAP purchase orders from PVS.
A material test program, described in Reference (3) involving all available TAP support items (30 different specimens), has been completed.
The test program consisted of performing chemical, physical, and macro-etching tests.
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Mr. 'Jchn T.. Collins Page 2 December 3,1982 The test results showed all chemical properties were within the specification limits.
The macro-etching - results were all completely acceptable.
The physical properties (yield strength, ultimate strength, clongation and reduction-in-area) were acceptable with the exception of the following minor deviations.
1.
One specimen of 1/4" plate had an ultimate strength 2.5% below the specification minimum.
2.
One specimen of 2" plate had a yield - strength 11% below the specification minimum.
'3.
One specimen of 1/2" plate had an ultimate strength 2% above the specification maximum.
The 'first and third items are being generically justified.
The ultimate strength does enter into the support allowable stress values except for level D loads.
The. worst case support for level D loads is 'being identified and qualified.
The slight exceedance of the maximum ultimate is a negligible variation since the elongation was acceptable and showed the material to be ductile.
The second item only affects two supports.
These supports are being requalified based on the actual as-built material strengths.
The test program results, with above evaluations, is considered to resolve all concerns regarding the traceability problems on TAP material identified in the audit of PVS.
Regarding the laminated plate concerns, the rework defined in Reference (3) to correct the supports containing plate with suspected laminations is in progress. The current schedule is to complete this rework in late December or early-January,1983.
Completion of the rework and the documentation of the various structural reevaluations for as-built material properties represent the final actions considered necessary.
Therefore, this report'is the final NPPD submittal to the NRC on this subject.
A complete, auditable report documenting the evaluations, results, and corrective actions for this problem will be on file at NPPD after February 1,1983.
Should you have any further questions or comments, please contact me.
S Sincerely, r
J.
. Pilant Division Manager of Licensing a. Quality Assurance JMP/teh:sn2/1
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