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| ' ##" A'8 (y 8 | | ' ##" A'8 (y 8 |
| > Atlanta, Georgia 30303 | | > Atlanta, Georgia 30303 |
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| ==Dear Mr. O'Reilly:== | | ==Dear Mr. O'Reilly:== |
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| j | | j |
| ' TVA has conducted an evaluation to determine if the laminations would significantly affect seepage or the structural integrity of the spray pond. | | ' TVA has conducted an evaluation to determine if the laminations would significantly affect seepage or the structural integrity of the spray pond. |
| j Five additional block samples have been taken in the vicinity of the earlier block samples which indicated laminations. The samples and the | | j Five additional block samples have been taken in the vicinity of the earlier block samples which indicated laminations. The samples and the j |
| ;
| | walls of the trenches excavated to obtain the samples were inspected for laminations. In general, no significant laminations, shear planes, cracks, l |
| j walls of the trenches excavated to obtain the samples were inspected for laminations. In general, no significant laminations, shear planes, cracks, l
| |
| or weak zones were observed in the samples or the trenches. Sample 5, which was taken from the bottom liner, contained a few minor and localized zones of laminations near the top surface of the block. In addition to the unconsolidated-undrained (Q) and consolidated-undrained (R) triaxial shear - | | or weak zones were observed in the samples or the trenches. Sample 5, which was taken from the bottom liner, contained a few minor and localized zones of laminations near the top surface of the block. In addition to the unconsolidated-undrained (Q) and consolidated-undrained (R) triaxial shear - |
| test, this sample was selected to conduct a vertical permeability test to simulate vertical seepage through the bottom liner of the pond. Sample 8, t | | test, this sample was selected to conduct a vertical permeability test to simulate vertical seepage through the bottom liner of the pond. Sample 8, t |
| which was taken in the slope of the pond liner contsined two minor | | which was taken in the slope of the pond liner contsined two minor localized laminations: one at the top and the other near the bottom of the block. |
| ;
| | i In addition to the normal Q and R shear strength testing, this sample was selected to conduct a horizontal permeability test to simulate lateral seepage through the slope liner. The test results of the i |
| ;
| |
| localized laminations: one at the top and the other near the bottom of the block. | |
| i In addition to the normal Q and R shear strength testing, this sample was selected to conduct a horizontal permeability test to simulate | |
| ;
| |
| lateral seepage through the slope liner. The test results of the i | |
| additional block samples are shown on the attached table. The horizontal and vertical permeabilities of block samples are lower than the design value impactindicating thatlosses on seepage there would throughbethe less seepage or at least n;o, adverse liner. | | additional block samples are shown on the attached table. The horizontal and vertical permeabilities of block samples are lower than the design value impactindicating thatlosses on seepage there would throughbethe less seepage or at least n;o, adverse liner. |
| m | | m |
|
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Category:DEFICIENCY REPORTS (PER 10CFR50.55E & PART 21)
MONTHYEARML20155A8131988-09-28028 September 1988 Supplemental Deficiency Rept CP-87-115 Re Modeling Error for Seismic Analysis of Svc Water Intake Structure.Initially Reported on 880201.Completion of Corrective Actions for Unit 1 Extended Until 881130 ML20076B4471983-08-10010 August 1983 Followup Part 21 Rept Re Emergency Diesel Generator 2B-B in Parsons-Peebles Electric Products Synchronous Generator S/N 14701228,supplied by Ge.Plants Supplied W/Generators Identified.Notification Ltr to GE Encl ML20077G6661983-07-27027 July 1983 Part 21 Rept Re Circuit Breakers Mfg Between Nov 1981 & Feb 1982.Breakers Should Be Inspected for Broken Puffer Linkage Studs.Stud Identified as Part Number 192247A.List of Circuit Breakers for Nuclear Plants Encl ML20069K6811983-04-18018 April 1983 First Interim Deficiency Rept Re Pipe Support Spacing Utilizing Alternate Criteria.Initially Reported on 830317. Investigation Postponed Until Design & Const Resumed ML20073J8051983-04-12012 April 1983 Third Interim Deficiency Rept Re Nonconservative Calculation Method for General Const Spec G-32 Violations.Initially Reported on 820528.Design Std Being Revised to Clarify Use of Factors of Safety in DS-C6.1 ML20072Q9571983-03-28028 March 1983 First Interim Deficiency Rept Re Failure of Util Div of Engineering Design to Provide Bolt Tightening Requirements to Div of Const.Initially Reported on 830228.Const Deferred. Rept to Be Submitted When Const Decision Made ML20083P6301983-01-28028 January 1983 Second Revised Final Deficiency Rept Re Welds on Component Cooling Water HX Mfg by Joseph Oat Corp.Initially Reported on 810306.Defects Removed by Grinding.Also Reported Per Part 21 ML20065R3701982-10-14014 October 1982 Interim Deficiency Rept Re Deferral of Const Activities. Initially Reported on 820623.Commitments Made in Rept,Audit Findings & Response to Violations Deferred Until Restart of Design & Const ML20065H8751982-09-27027 September 1982 First Interim Deficiency Rept Re Failure to Consider Seismic & Inertial Loadings on Ladders,Platforms & Walkways. Initially Reported on 820826.Const Activities Deferred Until Decision Re Const Completion Reached ML20063J9461982-08-27027 August 1982 Final Deficiency Rept Re Source Insp.Initially Reported 810120.Weld Inspectors Trained & Certified,Shop Surveillance Increased & Personnel Relocated to Provide More Intense Program of Source Insp.Full Compliance Achieved 820514 ML20054K1531982-06-23023 June 1982 Informs That Final Deficiency Repts for Listed Nonconformances Will Not Be Submitted Until Final Decision Is Made Re Const of Projects ML20054J9211982-06-22022 June 1982 Seventh Interim Deficiency Rept for Deficiencies 2,3,5 & 14 Re QA Audit M80-7,initially Reported 800923.Const Activities Deferred Until Sufficient Info Compiled ML20054G4161982-06-10010 June 1982 Final Deficiency Rept Re QA Deficiencies at Morgan Engineering,Inc,Initially Reported on 820512.Contract W/Morgan Engineering Canceled Due to Deferred Status of Const ML20052G5881982-04-27027 April 1982 Sixth Interim Deficiency Rept Re Source Insp,Initially Reported on 810120.Util Continuing Evaluation of Results of Insp of Equipment & Matl Purchased & of Generic Implications.Next Rept Due by 820827 ML20054A8591982-03-30030 March 1982 Fifth Interim Deficiency Rept Re Cooling Tower Makeup Control,Initially Reported on 810423.Const Activities Being Deferred to Minimize Expenditures & Effort,Pending Decision on Project Cancellation ML20050B0221982-03-19019 March 1982 Final Deficiency Rept 2 Re Failure of Transamerica Delaval to Correct Violations Identified During Audits 79V-38 & 80V-39 Promptly,Due to Improper QA Program Implementation, Initially Reported on 820114.Also Reported Per Part 21 ML20042A3131982-03-0909 March 1982 Final Deficiency Rept Re Const QA Program Procedural Control Deficiencies,Initially Reported 810731.Const Engineering Procedures Prepared & Revised for Configuration Control of drawings,site-originated Drawings & Field Change Requests ML20049J4391982-03-0303 March 1982 First Interim Deficiency Rept Re Check Valve Leak in Air Start Sys of Standing Diesel Generators,Initially Reported on 820209.Problem Under Investigation by Vendor.Next Rept Expected by 820528.Also Reported Per Part 21 ML20049J4991982-03-0101 March 1982 Final Deficiency Rept Re Fillet Weld Misspec,Initially Reported 801210.General Const Spec G-29C Revised to Clarify Const Requirements for Skewed T-joints.Info Emphasizing Aisc/Aws Requirements Will Be Issued by 820401 ML20069C1361982-02-22022 February 1982 Sixth Interim Deficiency Rept Re QA Audit M80-7 Deficiencies 2,3,5 & 14,initially Reported 800923. Deficiencies Still Being Reviewed.Next Rept to Be Submitted by 820624 ML20071H9341982-02-18018 February 1982 Fifth Interim Deficiency Rept Re Defective Welds Discovered During Visual Insps Between June & Dec 1980,initially Reported on 810120.Generic Implications of Source Insp Breakdown Will Be Evaluated.Next Rept Expected by 820427 ML20041A4241982-02-10010 February 1982 Deficiency Rept Re Failure of Transamerica Delaval to Promptly Correct Deficiencies,Initially Reported 820114. Deficiency Sheet Discussed W/Delaval Mgt.Next Rept by 820320.Also Reported Per Part 21 ML20041A6241982-02-0505 February 1982 First Interim Deficiency Rept Re Unevaluated Missile Source,Initially Reported on 820108.Probability of Fly Wheel Failure Under Investigation.Deficiency Will Be Reviewed for Possible Generic Applications ML20069B8731982-01-22022 January 1982 Third Interim Rept Re Tornado Depressurization Design Deficiencies,Initially Reported 810402.Ventilation Opening Added in Exterior Door of Each Stairwell.Stairwell Doors to Main Bldg Will Be Pressure Doors.Next Rept by 821020 ML20039E1471981-12-29029 December 1981 First Supplemental Rept Re Deficient Welds on Component Cooling Water Heat Exchangers,Initially Reported 810306. Further Insp Determined Defects Advanced Beyond Superficial. NRC to Be Informed of Actions.Also Reported Per Part 21 ML20069B2891981-12-16016 December 1981 Third Interim Deficiency Rept Re QA Compliance W/Ansi N45.2.11,initially Reported 810731.Evaluation of Deficiency & Possible Corrective Action Continuing.Next Rept by 820310 ML20062N3041981-12-0808 December 1981 Fourth Interim Deficiency Rept Re Cooling Tower Makeup Control,Initially Reported 810423.Analysis of safety-related Requirements Imposed by Design Criteria Ongoing.Next Rept by 820318 ML20038C7381981-12-0707 December 1981 Fourth Interim Deficiency Rept Re Weld Defects Undiscovered by Source Insp,Initially Reported 810120.Schedule of Source Welding Insps Is Complete.Util Is Reviewing & Evaluating Insps.Next Rept Will Be Submitted by 820204 ML20038C9151981-12-0404 December 1981 Fourth Interim Deficiency Rept Re Fillet Weld Misspec, Initially Reported on 801210.Engineers & Designers Have Been Alerted to Aisc/Aws Requirements for Limiting Angles for Skewed Tee Joints.Next Rept Due 820302 ML20011A9881981-10-23023 October 1981 Final Deficiency Rept Re Engineer Failure to Verify Preliminary Seismic Analyses Prior to Final Design Completion Initially Reported 810212.Final Evaluations Reveal That No Design Changes Are Required ML20011A6341981-10-0707 October 1981 Second Interim Deficiency Rept Re QA Program Compliance W/ ANSI N45.2.11,initially Reported on 810731.Evaluation of Deficiency & Corrective Actions Ongoing.Next Rept Expected by 811223 ML20010G8191981-09-0909 September 1981 Final Deficiency Rept Re Unconservative Mass Load Ratings for Cantilever Supports Supplied by Bechtel,Initially Reported 810810.Also Reported Per Part 21.Bechtel Has Modified Computer Code Input & Sent Corrected Data to Util ML20010G9131981-09-0909 September 1981 Second Interim Deficiency Rept Re Tornado Depressurization Design,Initially Reported on 810402.Ventilation Analysis for Essential Raw Cooling Water Pumping Station Complete.Final Documentation in Progress.Next Rept Expected 820127 ML20010G2081981-09-0404 September 1981 Third Interim Deficiency Rept Re Weld Defects Discovered During Source Insp,Initially Reported on 810120.Util Scheduling Special Team of Quality Engineering Branch Employees to Survey Each Site.Next Rept by 811208 ML20010E9101981-08-31031 August 1981 First Interim Deficiency Rept Re QA Program Failure to Comply W/Ansi N45.2.11,initially Reported on 810731.Caused by Lack of Control Over Drawing Procedures.Next Rept to Be Submitted by 811015 ML20010D1871981-08-17017 August 1981 Revised Final Deficiency Rept Re Lamination of Soil in Emergency Raw Cooling Water Spray Pond,Initially Reported on 810204.Evaluation Conducted to Determine Effect of Laminations.Table Encl ML20010C4561981-08-12012 August 1981 Third Interim Deficiency Rept Re Fillet Weld Misspec Initially Reported 801210.Util Is Reviewing All TVA & Vendor Designs Governed by AISC Spec & Aws Structural Welding Code. Structural Integrity of Joints Not Impaired by Misspec ML20010C7031981-08-11011 August 1981 Final Deficiency Rept Re Lamination of Soil in Essential Raw Cooling Water Spray Pond,Initially Reported on 810204.No Significant Lamination to Cause Adverse Impact on Seepage or Structural Integrity of Liner ML20009H4311981-07-31031 July 1981 Final Deficiency Rept Re Failure to Implement Design Criteria,Initially Reported on 810401.C-E & Util Developed Recommended Design to Alleviate Deficiency in Design of Spent Fuel Rack Embedments ML20009G6561981-07-27027 July 1981 Final Deficiency Rept Re Rebar Left Out of Concrete Pour, Originally Reported on 810629.Caused by Craft,Engineer & QC-civil Field Inspector Error.Top Face Bars of Pour W-H6 Spliced W/Grouted Splice Bars.Checklist Procedure Improved ML20009G1261981-07-24024 July 1981 Second Revised Final Deficiency Rept Re Welds on Gas Stripper Module,Initially Reported 801008.Norwalk Fabricators Will Remove Nonconforming Piping.Work Will Be Completed by 820301.Part 21 Applicable to Deficiency ML20009F4761981-07-17017 July 1981 Second Interim Deficiency Rept,Initially Reported on 810212, Re Unverified Seismic Analysis for Final Design.Final Seismic Structural Analysis Has Been Checked & Verified.Next Rept Will Be Submitted by 811028 ML20009F5781981-07-0808 July 1981 Second Interim Deficiency Rept Re Cooling Tower Makeup Control,Initially Reported 810423.No Addl Info to Rept at Present.Next Rept Will Be Submitted by 810819 ML20005A4101981-06-23023 June 1981 Second Interim Deficiency Rept Re Source Insp,Initially Reported on 810120.Generic Implications Re Breakdown in Quality Sys at Source Insp Level Are Being Studied.Next Rept Will Be Submitted by 810904 ML19352A9801981-05-28028 May 1981 Revised Final Deficiency Rept,Originaly Reported on 800321, Re Improper Documentation & Utilization of Computer Program Inertia.Inertia & Bigdyna Properly Utilized & Only Seismic Analysis for Control Bldg Affected ML20004C0811981-05-26026 May 1981 First Interim Deficiency Rept Re Cooling Tower Makeup Control,Initially Submitted 810423.Analysis of safety-related Requirements Imposed by Design Criteria Is in Progress ML19350D8031981-05-14014 May 1981 Final Deficiency Rept,Initially Reported 810414,re Nonconforming Concrete,Rebar & Bolt Coupler Placement in Fuel Bldg.Caused by Personnel Error & Misinterpreting Drawings.Slab Will Be Repoured by 810529 ML20008F9841981-05-0404 May 1981 First Interim Deficiency Rept,Initially Reported 810402,re Tornado Depressurization Design Deficiencies.Ventilation Analysis for Intake & Essential Raw Cooling Water Pumping Stations Performed.Next Rept Will Be Submitted by 810909 ML20008F8531981-05-0101 May 1981 Part 21 Rept Re C-E Failure to Implement Design Criteria for Seal Welding to Anchor Bolt,Initially Reported 810401. Channel Will Be Machined Between Bolt Locations & Liner Seal Weld.Next Rept by 810804 ML20003G4941981-04-23023 April 1981 Final Rept Re Error in Tpipe Program,Initially Reported on 810327.Corrected Version of Tpipe Program Verified & Put Into Production.Poll Showed No Incorrect Design Info Issued from Using Error 1988-09-28
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20155A8131988-09-28028 September 1988 Supplemental Deficiency Rept CP-87-115 Re Modeling Error for Seismic Analysis of Svc Water Intake Structure.Initially Reported on 880201.Completion of Corrective Actions for Unit 1 Extended Until 881130 ML20153E5011988-08-29029 August 1988 NRC Staff Evaluation of Site Stabilization Plan for Withdrawal of CPPR-172 & CPPR-173 ML20076B4471983-08-10010 August 1983 Followup Part 21 Rept Re Emergency Diesel Generator 2B-B in Parsons-Peebles Electric Products Synchronous Generator S/N 14701228,supplied by Ge.Plants Supplied W/Generators Identified.Notification Ltr to GE Encl ML20077G6661983-07-27027 July 1983 Part 21 Rept Re Circuit Breakers Mfg Between Nov 1981 & Feb 1982.Breakers Should Be Inspected for Broken Puffer Linkage Studs.Stud Identified as Part Number 192247A.List of Circuit Breakers for Nuclear Plants Encl ML20069K6811983-04-18018 April 1983 First Interim Deficiency Rept Re Pipe Support Spacing Utilizing Alternate Criteria.Initially Reported on 830317. Investigation Postponed Until Design & Const Resumed ML20073J8051983-04-12012 April 1983 Third Interim Deficiency Rept Re Nonconservative Calculation Method for General Const Spec G-32 Violations.Initially Reported on 820528.Design Std Being Revised to Clarify Use of Factors of Safety in DS-C6.1 ML20072Q9571983-03-28028 March 1983 First Interim Deficiency Rept Re Failure of Util Div of Engineering Design to Provide Bolt Tightening Requirements to Div of Const.Initially Reported on 830228.Const Deferred. Rept to Be Submitted When Const Decision Made ML20083P6301983-01-28028 January 1983 Second Revised Final Deficiency Rept Re Welds on Component Cooling Water HX Mfg by Joseph Oat Corp.Initially Reported on 810306.Defects Removed by Grinding.Also Reported Per Part 21 ML20065R3701982-10-14014 October 1982 Interim Deficiency Rept Re Deferral of Const Activities. Initially Reported on 820623.Commitments Made in Rept,Audit Findings & Response to Violations Deferred Until Restart of Design & Const ML20065H8751982-09-27027 September 1982 First Interim Deficiency Rept Re Failure to Consider Seismic & Inertial Loadings on Ladders,Platforms & Walkways. Initially Reported on 820826.Const Activities Deferred Until Decision Re Const Completion Reached ML20063J9461982-08-27027 August 1982 Final Deficiency Rept Re Source Insp.Initially Reported 810120.Weld Inspectors Trained & Certified,Shop Surveillance Increased & Personnel Relocated to Provide More Intense Program of Source Insp.Full Compliance Achieved 820514 ML20054K1531982-06-23023 June 1982 Informs That Final Deficiency Repts for Listed Nonconformances Will Not Be Submitted Until Final Decision Is Made Re Const of Projects ML20054J9211982-06-22022 June 1982 Seventh Interim Deficiency Rept for Deficiencies 2,3,5 & 14 Re QA Audit M80-7,initially Reported 800923.Const Activities Deferred Until Sufficient Info Compiled ML20054G4161982-06-10010 June 1982 Final Deficiency Rept Re QA Deficiencies at Morgan Engineering,Inc,Initially Reported on 820512.Contract W/Morgan Engineering Canceled Due to Deferred Status of Const ML20052G5881982-04-27027 April 1982 Sixth Interim Deficiency Rept Re Source Insp,Initially Reported on 810120.Util Continuing Evaluation of Results of Insp of Equipment & Matl Purchased & of Generic Implications.Next Rept Due by 820827 ML20054A8591982-03-30030 March 1982 Fifth Interim Deficiency Rept Re Cooling Tower Makeup Control,Initially Reported on 810423.Const Activities Being Deferred to Minimize Expenditures & Effort,Pending Decision on Project Cancellation ML20050B0221982-03-19019 March 1982 Final Deficiency Rept 2 Re Failure of Transamerica Delaval to Correct Violations Identified During Audits 79V-38 & 80V-39 Promptly,Due to Improper QA Program Implementation, Initially Reported on 820114.Also Reported Per Part 21 ML20042A3131982-03-0909 March 1982 Final Deficiency Rept Re Const QA Program Procedural Control Deficiencies,Initially Reported 810731.Const Engineering Procedures Prepared & Revised for Configuration Control of drawings,site-originated Drawings & Field Change Requests ML20049J4391982-03-0303 March 1982 First Interim Deficiency Rept Re Check Valve Leak in Air Start Sys of Standing Diesel Generators,Initially Reported on 820209.Problem Under Investigation by Vendor.Next Rept Expected by 820528.Also Reported Per Part 21 ML20049J4991982-03-0101 March 1982 Final Deficiency Rept Re Fillet Weld Misspec,Initially Reported 801210.General Const Spec G-29C Revised to Clarify Const Requirements for Skewed T-joints.Info Emphasizing Aisc/Aws Requirements Will Be Issued by 820401 ML20069C1361982-02-22022 February 1982 Sixth Interim Deficiency Rept Re QA Audit M80-7 Deficiencies 2,3,5 & 14,initially Reported 800923. Deficiencies Still Being Reviewed.Next Rept to Be Submitted by 820624 ML20071H9341982-02-18018 February 1982 Fifth Interim Deficiency Rept Re Defective Welds Discovered During Visual Insps Between June & Dec 1980,initially Reported on 810120.Generic Implications of Source Insp Breakdown Will Be Evaluated.Next Rept Expected by 820427 ML20041A4241982-02-10010 February 1982 Deficiency Rept Re Failure of Transamerica Delaval to Promptly Correct Deficiencies,Initially Reported 820114. Deficiency Sheet Discussed W/Delaval Mgt.Next Rept by 820320.Also Reported Per Part 21 ML20041A6241982-02-0505 February 1982 First Interim Deficiency Rept Re Unevaluated Missile Source,Initially Reported on 820108.Probability of Fly Wheel Failure Under Investigation.Deficiency Will Be Reviewed for Possible Generic Applications ML20069B8731982-01-22022 January 1982 Third Interim Rept Re Tornado Depressurization Design Deficiencies,Initially Reported 810402.Ventilation Opening Added in Exterior Door of Each Stairwell.Stairwell Doors to Main Bldg Will Be Pressure Doors.Next Rept by 821020 ML20039B5681981-12-30030 December 1981 Yellow Creek Nuclear Plant Socioeconomic Monitoring & Mitigation Rept. ML20039E1471981-12-29029 December 1981 First Supplemental Rept Re Deficient Welds on Component Cooling Water Heat Exchangers,Initially Reported 810306. Further Insp Determined Defects Advanced Beyond Superficial. NRC to Be Informed of Actions.Also Reported Per Part 21 ML20069B2891981-12-16016 December 1981 Third Interim Deficiency Rept Re QA Compliance W/Ansi N45.2.11,initially Reported 810731.Evaluation of Deficiency & Possible Corrective Action Continuing.Next Rept by 820310 ML20062N3041981-12-0808 December 1981 Fourth Interim Deficiency Rept Re Cooling Tower Makeup Control,Initially Reported 810423.Analysis of safety-related Requirements Imposed by Design Criteria Ongoing.Next Rept by 820318 ML20038C7381981-12-0707 December 1981 Fourth Interim Deficiency Rept Re Weld Defects Undiscovered by Source Insp,Initially Reported 810120.Schedule of Source Welding Insps Is Complete.Util Is Reviewing & Evaluating Insps.Next Rept Will Be Submitted by 820204 ML20038C9151981-12-0404 December 1981 Fourth Interim Deficiency Rept Re Fillet Weld Misspec, Initially Reported on 801210.Engineers & Designers Have Been Alerted to Aisc/Aws Requirements for Limiting Angles for Skewed Tee Joints.Next Rept Due 820302 ML20011A9881981-10-23023 October 1981 Final Deficiency Rept Re Engineer Failure to Verify Preliminary Seismic Analyses Prior to Final Design Completion Initially Reported 810212.Final Evaluations Reveal That No Design Changes Are Required ML20011A6341981-10-0707 October 1981 Second Interim Deficiency Rept Re QA Program Compliance W/ ANSI N45.2.11,initially Reported on 810731.Evaluation of Deficiency & Corrective Actions Ongoing.Next Rept Expected by 811223 ML20010G8191981-09-0909 September 1981 Final Deficiency Rept Re Unconservative Mass Load Ratings for Cantilever Supports Supplied by Bechtel,Initially Reported 810810.Also Reported Per Part 21.Bechtel Has Modified Computer Code Input & Sent Corrected Data to Util ML20010G9131981-09-0909 September 1981 Second Interim Deficiency Rept Re Tornado Depressurization Design,Initially Reported on 810402.Ventilation Analysis for Essential Raw Cooling Water Pumping Station Complete.Final Documentation in Progress.Next Rept Expected 820127 ML20010G2081981-09-0404 September 1981 Third Interim Deficiency Rept Re Weld Defects Discovered During Source Insp,Initially Reported on 810120.Util Scheduling Special Team of Quality Engineering Branch Employees to Survey Each Site.Next Rept by 811208 ML20010E9101981-08-31031 August 1981 First Interim Deficiency Rept Re QA Program Failure to Comply W/Ansi N45.2.11,initially Reported on 810731.Caused by Lack of Control Over Drawing Procedures.Next Rept to Be Submitted by 811015 ML20010D1871981-08-17017 August 1981 Revised Final Deficiency Rept Re Lamination of Soil in Emergency Raw Cooling Water Spray Pond,Initially Reported on 810204.Evaluation Conducted to Determine Effect of Laminations.Table Encl ML20010C4561981-08-12012 August 1981 Third Interim Deficiency Rept Re Fillet Weld Misspec Initially Reported 801210.Util Is Reviewing All TVA & Vendor Designs Governed by AISC Spec & Aws Structural Welding Code. Structural Integrity of Joints Not Impaired by Misspec ML20010C7031981-08-11011 August 1981 Final Deficiency Rept Re Lamination of Soil in Essential Raw Cooling Water Spray Pond,Initially Reported on 810204.No Significant Lamination to Cause Adverse Impact on Seepage or Structural Integrity of Liner ML20009H4311981-07-31031 July 1981 Final Deficiency Rept Re Failure to Implement Design Criteria,Initially Reported on 810401.C-E & Util Developed Recommended Design to Alleviate Deficiency in Design of Spent Fuel Rack Embedments ML20009G6561981-07-27027 July 1981 Final Deficiency Rept Re Rebar Left Out of Concrete Pour, Originally Reported on 810629.Caused by Craft,Engineer & QC-civil Field Inspector Error.Top Face Bars of Pour W-H6 Spliced W/Grouted Splice Bars.Checklist Procedure Improved ML20009G1261981-07-24024 July 1981 Second Revised Final Deficiency Rept Re Welds on Gas Stripper Module,Initially Reported 801008.Norwalk Fabricators Will Remove Nonconforming Piping.Work Will Be Completed by 820301.Part 21 Applicable to Deficiency ML20009F4761981-07-17017 July 1981 Second Interim Deficiency Rept,Initially Reported on 810212, Re Unverified Seismic Analysis for Final Design.Final Seismic Structural Analysis Has Been Checked & Verified.Next Rept Will Be Submitted by 811028 ML20009F5781981-07-0808 July 1981 Second Interim Deficiency Rept Re Cooling Tower Makeup Control,Initially Reported 810423.No Addl Info to Rept at Present.Next Rept Will Be Submitted by 810819 ML20005A4101981-06-23023 June 1981 Second Interim Deficiency Rept Re Source Insp,Initially Reported on 810120.Generic Implications Re Breakdown in Quality Sys at Source Insp Level Are Being Studied.Next Rept Will Be Submitted by 810904 ML19346A3441981-06-18018 June 1981 Amend 59 to PSAR ML20003G9221981-05-31031 May 1981 Amend 57 to PSAR ML19352A9801981-05-28028 May 1981 Revised Final Deficiency Rept,Originaly Reported on 800321, Re Improper Documentation & Utilization of Computer Program Inertia.Inertia & Bigdyna Properly Utilized & Only Seismic Analysis for Control Bldg Affected ML20004C0811981-05-26026 May 1981 First Interim Deficiency Rept Re Cooling Tower Makeup Control,Initially Submitted 810423.Analysis of safety-related Requirements Imposed by Design Criteria Is in Progress 1988-09-28
[Table view] |
Text
.__ __ __ .- _ _ _ _ _ _ _ _ .. . .
4 .. e TENNESSEE VALLEY AUTHORITY CHATTANOOGA, TENNESSEE 374ollilC C E~
400 Chestnut Street Tower IIi,?- ' :-
August 17, 1981
- } f o r 19 Alk
- 00 l YCRD-50-566/81-03 r G s!.~
Mr. James P. O'Reilly, Director 2 f
3 Office of Inspection and Enforcement r ,gt
- U.S. Nuclear Regulatory Commission J, 2.1 }$8] h h um ana, o,,,,
Region II - Suite 3100 101 Marietta Street
' ##" A'8 (y 8
> Atlanta, Georgia 30303
Dear Mr. O'Reilly:
WI i YELLOW CREEK NUCLEAR PLANT UNIT 1 - LAMINATION OF SOIL IN ERCW SPRAY POND - ,
- YCRD-50-566/81 REVISED FINAL REPORT I
i The subject deficiency was initially reported to NRC-0IE Inspector R. W.
l Wright on February 4, 1981, in accordance with 10 CFR 50.55(e) as NCR YC-144. This was followed by our first interim report dated March 5,1981 ,
and our final report dated Augttst 11, 1981. As discussed with Don Quick by '
telephone on August 13, 1981, enclosed is our revised final report. The reason for the revision is to submit the table referenced in the final report.
If you have any questions concerning this matter, please get in touch with
- D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY R <
- L. M. Mill's, Ma ager
)
Nuclear Regulation and Safety i'
Enclosures
! cc: Mr. Victor Stello, Jr., Director (Enclosures)
! Offist of Inspection and Enforcement j U.S. Nuclear Regulatory Commission Washington, DC 20555 p) ~
/ /
i a
i g8 6 7 An Equal Opportunity Employer S i
a b i
t -
ENCLOSURE YELLOW CREEK NUCLEAR PLANT UNIT 1 LAMINATION OF S0IL IN E3CW SPRAY POND YCRD-50-566/81-03 REVISED FINAL REPORT
] DESCRIPTION OF DEFICIENCY
- ' As part of TVA's construction control testing, earthfill block (undisturbed) samples are required to be taken from Category I earthfill placement. Laminations have been observed in several block sample's taken from the earthfill liner in the unit 1 ERCW spray pond. Most j;fh^~ ,
laminations occurred at a depth of 1 to 3 inches from the top of the block samples. This deficiency was deemed reportable since the presence of laminations could adversely affect the seepage or structural integrity of the spray pond.
A Laminations in the earthfill liner, were possibly caused by overcompaction, excessive speed of hauling equipment, or failing to scarify the top surface of any previously placed layer of fill.
SAFETY IPPLICATIONS ,
The spray pond liners are designed taking into account permeability and shear strength of earthfill among other factors. Laminations may have some effect on the seepage and the shear strength of the liner. If the laminations are significant and remain uncorrected, this could cause an increase in permeability and could reduce the shear strength. This would result in additional seepage losses and reduced safety factors for the 4
spray pond slope stability.
4 CORRECTIVE ACTION i
j
' TVA has conducted an evaluation to determine if the laminations would significantly affect seepage or the structural integrity of the spray pond.
j Five additional block samples have been taken in the vicinity of the earlier block samples which indicated laminations. The samples and the j
walls of the trenches excavated to obtain the samples were inspected for laminations. In general, no significant laminations, shear planes, cracks, l
or weak zones were observed in the samples or the trenches. Sample 5, which was taken from the bottom liner, contained a few minor and localized zones of laminations near the top surface of the block. In addition to the unconsolidated-undrained (Q) and consolidated-undrained (R) triaxial shear -
test, this sample was selected to conduct a vertical permeability test to simulate vertical seepage through the bottom liner of the pond. Sample 8, t
which was taken in the slope of the pond liner contsined two minor localized laminations: one at the top and the other near the bottom of the block.
i In addition to the normal Q and R shear strength testing, this sample was selected to conduct a horizontal permeability test to simulate lateral seepage through the slope liner. The test results of the i
additional block samples are shown on the attached table. The horizontal and vertical permeabilities of block samples are lower than the design value impactindicating thatlosses on seepage there would throughbethe less seepage or at least n;o, adverse liner.
m
_ _ _ __ - ~ ~ -
s
. ~ ,
The apparent shear strength values for R tests are higher than the design value and therefore should not have an adverse impact on the slope stability of the pond.
The effective friction angle values for both block samples are relatively higher than the design value. Sample 5 indicated slightly lower cohesion than the design value, but this should not have a significant effect on the long-term slope stability.
The Q-test friction angles are higher than the design value. Although the Q-test cohesion values are relatively lower, no significant impact on the stability is anticipated since there is an ample safety factor (= 7.45) for during construction and end of conatruction cases. Moreover, the liner construction is almost complete, and there is no sign of sliding or stabi,lity problems to date.
Based upon the field observations and the laboratory test results, it is concluded that there is no significant lamination to cause any adverse impact on the seepage or the structural integrity of the unit 1 spray pond liner. Therefore, no corrective action is required on the inplace earthfill. To lessen the probability of laminations occurring in the future, TVA has included a table with recommended compaction guidelines for earthfill in T7A construction specification N8C-882. This table lists the rollers which have been tested, the corresponding loose-lift thickness, and the number of roller passes which should be used in compacting the earthfill to meet the required compaction criteria.
If the surface of any previously placed layer of earthfill is too smooth, TVA also requires the surface to be scarified to create a rough contact before placing subsequent earthrill layers. This has been incorporated into TVA construction specification N8C-882.
This problem has not been found at other TVA nuclear plants.
_ TABLE YrLLC11 CR!tX K';CL?Nt PLANT T1RTWFIL* FC2 ERCU SPR,W 70CS DLCC's SA>T *S ,
Coefficient Atterbere Lirits_ og rfaxisI'R 31cck Seil Moistute Dry _ Particle Stra Ar'** /cis Liquid Plasticity _W ieriet 0 _ ?ar -e:bility; No. Ceordiistes Elevstion Sy-hel Content _ rensity_*C, ravel S t.,d Silt Olav Linit In3ex 4 e i e }_,, E Kh Iv deg tst ' t.c 3 tst crfsec caj2c:
% FCf % % % % % I tst des 2 CD+15.9 54+92 SCD,1 50 15.4 114.1 1 57 11, 31 39 17 -- -- -- - -- - - -
5 EO+51.1 57+99.2 498.0 SC 18.4 105.6 1 65 12 22 34 19 18.9 0.62 11.9 1,29 32.5 C.06 -- 6.4x 20-8 3 cl+52 59+50 513.5, SO 10.7 104.9 2 65 13 23 31 11 17.7 0.51 22.2 0.45 30.3 0.21 .7.4x10-5 ,,
~
9 VC+5G SA+41 5C6.6 50 16.0 - 106.8 1 58 11 30 36 14 - -- ~ - - - . .
10 W3+43.5 55+!1 515.4 50 20.0 101.7 4 57 10 29 $ al 18 - -- -- -- -- -- --- --
ADOPTED DESIGN VALUES ,
Coefficient of -
Triaxial Q Triaxial R Pernenbility -
6 C_ _
6 C l. C K deg _tof deg tsf deg tsf cm/sec-
~0 13 0.8 14 0.2 30 0.1 50x10 I
9 g f "
i j e
M e
e e