Letter Sequence Other |
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Results
Other: ML20083M935, ML20084H457, ML20084P594, ML20092D927, ML20094R400, ML20096C908, ML20106B579, ML20107K230, ML20112D736, ML20126C521, ML20127K137, ML20127N695, ML20128N286, ML20132G502, ML20154A542, ML20235N112
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MONTHYEARML20083M9351984-04-12012 April 1984
Discusses Problems W/Pcrv Prestressing Sys & Resultant Insp Test Results.Liftoff Tests Show Tendon Sys Operable.Nrc Permission to Return to Power Operation from Present Refueling Outage Requested by 840418
Project stage: Other
ML20084H4571984-04-25025 April 1984
Forwards Relaxation Curves for Prestressed Concrete Reactor Vessel Tendon Sys,In Response to 840419 Request.No Immediate Mechanism for Controlling Sleeve Atmosphere Provided.Areas W/Indicated Corrosion Regreased
Project stage: Other
ML20084P5941984-05-0707 May 1984
Forwards Pcrv Tendon Sys Relaxation Curves Containing Min Design Lines,Per H Polk 840503 Telcon Request
Project stage: Other
ML20092D9271984-06-15015 June 1984
Responds to Requesting Details of Proposed Tendon Surveillance Program.Program Consists of Load Cell Data & Visual Insps.Surveillance Started on 840601.Program Developed Using Reg Guide 1.35 as Ref
Project stage: Other
ML20093J1171984-07-20020 July 1984
Forwards Rev 2 to Updated FSAR for Fort St Vrain.Rev Includes Safety Evaluations Either in Support of License Amends or in Support of Conclusions That Changes Did Not Involve Unreviewed Safety Question
Project stage: Request
ML20094R4001984-08-0909 August 1984
Confirms 840806 Telcon on Tech Spec Change Request Re Tendon Corrosion & Anchor Assembly Surveillance.Tech Spec Change Request Will Be Submitted by 840930
Project stage: Other
ML20096C9081984-08-20020 August 1984
Responds to Re Possible Design Mods to Pcrv Tendons & Details of Evaluations & Schedule of Completion of Repts Detailing Results of Metallurgical Exams.Actions Necessary to Evaluate Design Mods for Pcrv Listed
Project stage: Other
ML20107K2301984-10-18018 October 1984
Updates Tendon Investigations & Corrosion Prevention Programs.Efforts Concentrated on Corrosion Prevention Methods Rather than Detailed Moisture Measurements
Project stage: Other
ML20112D7361984-12-14014 December 1984
Forwards Tendon Accessibility Info,Rationale for Tendon Surveillance & Info Re Corrosion Mechanism in Response to 840720 & 1029 Requests for Addl Info.Tendons Considered Acceptable If No Major Mods Necessary
Project stage: Other
ML20106B6131985-01-31031 January 1985
Discusses Visual Insp of Top Longitudinal Tendons,Per 850115 Meeting Request.Visual Insp of 30% of Longitudinal Tendons for Buttonheads Noted.Inconsistency Exists Between Last Mapping of Raised Buttonheads & Current Insp Results
Project stage: Meeting
ML20106B5791985-01-31031 January 1985
Submits Plans for Implementing Interim Tendon Surveillance Program,In Response to Concerns.Surveillance Program Will Be Based on Proposed Tech Spec SR 5.2.2,submitted in DW Warembourg
Project stage: Other
ML20132G5021985-03-12012 March 1985
Evaluation of CRD Mechanism & Reserve Shutdown Sys Failures & Pcrv Tendon Degradation Issues Prior to Fort St Vrain Restart
Project stage: Other
ML20128N2861985-05-20020 May 1985
Informs of Intent to Conduct Addl Insps of Random Sample of Pcrv Bottom Head Longitudinal Tendon Anchor Assemblies. Thirty-four Longitudinal Bottom End Caps Accessible.Ten End Caps Will Be Removed & Inspected
Project stage: Other
ML20126C5211985-05-23023 May 1985
Discusses Investigation of Methods to Control Tendon Corrosion Involving Establishment of Nitrogen Blanket on Pcrv Tendon Sys.Establishing & Maintaining Overall Nitrogen Blanket Sys for Tendons Highly Questionable
Project stage: Other
ML20127K1371985-06-0707 June 1985
Discusses Insp of 10 Bottom Longitudinal Tendon End Caps. Tendons Visually & Magnetic Particle Inspected for Evidence of Corrosion,Concavity,Water,Apparent Failures & Cracking.No Raised Buttonheads Found.All Tests Negative
Project stage: Other
ML20127N6951985-06-14014 June 1985
Elaborates on Util Commitments to Listed Plant Activities, Including CRD Mechanism Temp Recording,Requalification, Surveillance & Preventative Maint,Backup Reactor Shutdown Procedure,Tendons & Pcrv Integrity & Electrical Sys
Project stage: Other
ML20138A8071985-07-0202 July 1985
Forwards Updated Safety Evaluation Accepting Util Commitments Re Tendon Surveillance as Basis for Restart. Util Will Incorporate Modified Tendon Surveillance Program Into Tech Specs & Provide Results 6 Months After Restart
Project stage: Approval
ML20138A8551985-07-0202 July 1985
Safety Evaluation Accepting Util Tendon Surveillance Proposal.Proposal Will Lead to Maintaining Structural Integrity of Reactor Vessel.Plant Structurally Ready for Restart
Project stage: Approval
ML20132G4501985-07-0808 July 1985
Forwards Safety Evaluation Re Pcrv Prestressing Tendon Wire Corrosion Problems.Submittals & 0614 Acceptably Resolve Concerns.Lasl Evaluation Rept Encl
Project stage: Approval
ML20132G4761985-07-0808 July 1985
Safety Evaluation Re Pcrv Tendon Corrosion Investigation & Proposed Remedy.Tendon Surveillance Proposal Acceptable
Project stage: Approval
ML20235N1121987-07-0909 July 1987
Forwards Lasl Technical Evaluation Rept, Technical Assistance for Fort St Vrain Task Ii:Pcrv & Pcrv Tendon Evaluation, Final Rept
Project stage: Other
ML20154A5421988-08-30030 August 1988
Requests Addl Info Re Rev 7 to Schedule Commitment Items on Pcrv Tendon Surveillance Involving Provision of Schedule for Conducting Evaluation within 45 Days for Pcrv Tendon Degradation
Project stage: Other
1985-01-31
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Text
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public Service Company o1' 0cIlmrsde v
16805 WCR 19 1/2, Platteville, Colorado 80651 January 31, 1985 Fort St. Vrain Unit #1 P-85039 Regional Administrator Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011 Attn:
Mr. E. H. Johnson
SUBJECT:
Interim Fort St. Vrain Tendon Surveillance Program
REFERENCES:
PSC Letter, D. W. Warembourg to E. H. Johnson 12/14/84(P-84523)
Dear Mr. Johnson:
In response to the cor.cerns expressed by the NRC we are submitting for your evaluation our plans for implementing an interim tendon surveillance program.
The surveillance program will be based on proposed Technical Specification SR 5.2.2 as submitted in Reference 1 and will include those tendons considered accessible in Reference 1.
PSC plans to implement the surveillance program based on information gathered in our original assessment effort and your expressed concerns for determining the present overall level of corrosion and the current rate of corrosion.
The majority of this program has already been started as a continuing effort following completion of tendon testing we had previously committed to perform.
The entire program will be implemented by March 1, 1985 and will be based on an eighteen month cycle, as cited in the submitted SRs.
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1.
Tendon Surveillance Specification SR 5.2.2 includes five (5)' sections i
which PSC plans to treat as follows during this interim period.
1.
SAMPLE WIRES INSERTED INTO TENDONS WITH AREAS OF KNOWN CORROSION No action will be initiated during the interim period.
The sample wires currently in the tendens are not necessarily in tendons with areas of known corrosion. The tendons with areas of corrosion are currently being identified and supplias of sample wires are currently being investigated.
2.
ATMOSPHERIC SAMPLES OF TENDON TUBES No action will be initiated during the interim period.
Tendon caps have been removed on 'most tendons for examinations and air, therefore, was introduced into the tubes. The corrosion prevention system has not been finalized as of this date and sampling of the tubes atmosphere would provide no useful information.
During the original corrosion determination investigation the atmospheres in 97 wobes were sampled and tested.
The results of these tests have been supplied to the NRC.
3.
VISUAL EXAMINATION OF ACCESSIBLE TENDONS During the interim period PSC will perform this section as 4
it was submitted to the NRC. A visual examination of at least 5% of the accessible ancher assemblies for the top crosshead and circumferential tendons shall be performed.
A visual examination of at least 33% of the accessible ancher assemblies for the longitudinal and bottom-crosshead tendons shall be performed. This will include re-examination of tendons with areas of known corrosion to obtain information on the current rate of corrosion'.
In addition to the required percentage of tendons, an additional two repeat tendons will be_ examined to. provide
.for continuous monitoring of corrosion rate.
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TENDON LIST OFF TEST During the interim period PSC will perform this section as it was submitted to the NRC.
Lift off test of at least 5%
of the accessible top crosshead tendons and circumferential tendons shall be performed.
Lift off test of at least 15% of the accessible longitudinal tendons and bottom croschead tendons shall be performed.
In addition to the required percentage of tendons, an additional two repeat tendons will be tested to provide for continuous monitoring of corrosion rate.
5.
REPORT OF TENDON EXAMINATION RESULTS
,e At the end of the interim period a report will be prepared covering the testing done during the interim period. This special report will be submitted to the NRC at that time.
If specification SR5.2.2 is formally approved prior to the end of the eighteen month interim period, the special-report will be prepared indicating the status at that time.
Please be aware that the Specification SR 5.2.2 submitted in Reference I was a preliminary Technical Specification submittal, only for the purpose of presenting our rational for a tendon surveillance program.
We trust this provides the requested commitment to begin an interim tendon surveillance program and satisfies your concerns.
If there are any further questions concerning the PCRV tendons please contact me or Mr. Chuck Fuller at (303) 785-2223.
Sincerely, J. W. Gahm Manager, Nuclear Production Fort St. Vrain Nuclear Generating Station JWG:AR/djc
