CNL-14-063, the Tennessee Valley Authority Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report
| ML14126A843 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry, Watts Bar, Sequoyah  |
| Issue date: | 04/30/2014 |
| From: | James Shea Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| CNL-14-063 | |
| Download: ML14126A843 (11) | |
Text
L44 140430 005 Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402 CNL-14-063 April 30, 2014 10 CFR 50.4 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Browns Ferry Nuclear Plant, Units 1, 2, and 3 Facility Operating License Nos. DPR-33, DPR-52, and DPR-68 NRC Docket Nos. 50-259, 50-260, and 50-296 Sequoyah Nuclear Plant, Units 1 and 2 Facility Operating License Nos. DPR-77 and DPR-79 NRC Docket Nos. 50-327 and 50-328 Watts Bar Nuclear Plant, Unit 1 Facility Operating License No. NPF-90 NRC Docket No. 50-390
Subject:
The Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report
Reference:
- 1. TVA letter to NRC, Additional Information Regarding March 28, 2013, Public Meeting With NRC Regarding The Tennessee Valley Authoritys (TVA)
Commercial Grade Dedication Recovery Project, dated April 30, 2013 (ML13123A163)
- 2. TVA letter to NRC, The Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project Plan - July 2013 Status Report, dated July 31, 2013 (ML13220A102)
- 3. TVA letter to NRC, The Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - October 2013 Status Report, dated October 31, 2013 (ML13309A747)
- 4. TVA letter to NRC, The Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - January 2014 Status Report, dated January 31, 2014 (ML14038A139 )
Nuclear Regulatory Commission Page2 April 30, 2014 The purpose of this letter is to provide the Nuclear Regulatory Commission (NRC) staff with the April2014 Commercial Grade Dedication Recovery Project Quarterly Update. Previous updates were provided in References 2, 3, and 4.
In Enclosure 2 of the Reference 1 letter, TVA provided the NRC with a TVA Nuclear Power Group Commercial Grade Dedication Recovery Project Action Plan Summary that included Commercial Grade Dedication Recovery Project Milestones. In Milestone 4, TVA stated that quarterly updates would be provided to the NRC starting in July 2013 and that the updates would include any failures found in either the installed equipment review or warehouse inventory review along with an evaluation of safety significance of such failures for the installed items.
Based on progress made to date, the TVA Nuclear Power Group Commercial Grade Dedication Recovery Project is on track to meet the December 2014 commitment date. In addition, no issues have been identified that resulted in declaring plant equipment to be inoperable.
The enclosure to this letter provides the TVA Nuclear Power Group Commercial Grade Dedication Recovery Project- April2014 Status Report.
There are no new regulatory commitments contained in this letter. Should you have any questions, please contact John Laffrey, at (423) 751-3262.
J. . Shea Vice President, Nuclear Licensing
Enclosure:
Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project- April2014 Status Report cc:
NRC Regional Administrator- Region II NRC Senior Resident Inspector- Browns Ferry Nuclear Plant NRC Senior Resident Inspector- Sequoyah Nuclear Plant NRC Senior Resident Inspector- Watts Bar Nuclear Plant NRR Project Manager - Browns Ferry Nuclear Plant NRR Project Manager- Sequoyah Nuclear Plant NRR Project Manager- Watts Bar Nuclear Plant
ENCLOSURE Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report INTRODUCTION:
From April 2013 to October 2013, the Commercial Grade Dedication (CGD) Recovery Project Team identified 22,324 unique Catalog Identifiers (CATIDs) that have been generated for CGD items across the TVA Nuclear Power Group Fleet since September 1995, when significant changes were made to 10 CFR Part 21. Of this population, there were 13,175 unique CATIDs that were estimated to be either not purchased or not installed.
As of April 2014, TVA has identified 16 additional CATIDs, bringing the total population from 22,324 to 22,340. In addition, from the total population of 22,340 CATIDs, TVA has verified and documented that 17,343 were either not purchased or not installed. Therefore, the remaining 4,997 unique CATIDs have been either purchased or installed in a TVA nuclear plant and will require evaluation and disposition.
The CGD Recovery Project is evaluating the unique CATIDs in groups where possible. In many cases, several CGD packages have been generated for the same unique CATID due to the number of years of plant operations under evaluation.
The status provided below documents the progress to date based on accounting for the applicable number of unique CATIDs. The CGD packages reviewed prior to April 2013, including those reported during the March 2013 NRC meeting, are captured in the number of unique CATIDs accounted for in this letter.
PROGRESS TO DATE:
As of April 4, 2014, the TVA CGD Recovery Project Weekly Report indicated that from the population of 17,343 CATIDs that were either not purchased or not installed, 17,343 CATIDs have been verified via an additional data search to not exist in inventory or in the operating units. The number of CATIDs verified to be either not purchased or not installed increased by 4,168 since the January 2014 Status Report. This completes the verification and documentation of CATIDs that were either not purchased or not installed.
As of April 4, 2014, the TVA CGD Recovery Project Weekly Report indicated that from the population of 4,997 CATIDs that were purchased and are either in inventory or installed, 3,713 CATIDs have been assessed against project plan review criteria, including the critical characteristics for acceptance (CCA), and were found to be acceptable.
In addition, there were 54 CATIDs that were assessed against project plan review criteria and found to be acceptable for applicable critical characteristics for acceptance with the exception of seismic CCA information. One of the 54 CATIDs, a General Electric HFA relay (CATID CFB485C), was removed from inventory and sent to a third party qualifier for seismic testing.
The relay failed testing criteria due to contact chatter. The failure is documented in PER 845971 and is described below under the Recently Identified Issues section.
The assessment of seismic CCA information for seismic sensitive CATIDs is ongoing.
Additional actions and additional resources will be applied to ensure the original project completion commitment date of December 31, 2014, is met.
From the population of CATIDs that were purchased and are either in inventory or installed, there were 665 CATIDs evaluated and dispositioned since the January 2014 Status Report.
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ENCLOSURE Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report Based on the progress made to date, there are 1,284 CATIDs remaining for evaluation and/or disposition. The TVA CGD Recovery Project is progressing as planned and scheduled.
UPDATE ON PREVIOUSLY IDENTIFIED ISSUES:
The status of previously identified testing failures is summarized in the table below.
Status Report SR/PER CATID Item Failure Disposition Status Date Number Description Description (Open/
Closed)
July 31, 2013 SR 755044 CAE345C Overload Failed current Purchased new heaters for Closed (PER Heaters carrying due to testing to revised criteria.
762570) incorrect test All items passed testing.
current July 31, 2013 SR 755092 BKG441M 1-1/4 Inch Failed dimensional Used three point Closed (PER Copper test - use of single measurement technique &
762593) Couplings measurement additional analyses to point accept Items.
October 31, 2013 PER 793398 BDH517E Fuses Failed current Open actions include final Open and 20A, 250V clearing testing evaluation for 826788 Time Delay consequences of failure.
Review for 10CFR21 reportability.
October 31, 2013 PER 794799 BXA282G Pressure Failed acceptance Defective pressure switch. Closed and 821184 Switch criteria for Scrap, repurchase and configuration, perform CGD.
operating response, repeatability, and weight October 31, 2013 PER 793399 CKA398K Brass Tubing Failed threading Installed fitting acceptable Closed and 821992 Tee Fittings testing based on completed conditional dedication.
October 31, 2013 PER CKJ806N Hydraulic Fluid Failed flash point Revised flash point criteria Closed 784385, test to lower value. Material 793529, acceptable for end use 828658 applications.
January 31, 2014 PER 827195 CRE543B Breather Caps Failed testing Open actions include Open criteria for material evaluation of test results type and re-perform designated inspections.
January 31, 2014 PER 827194 CRF195B Vent Caps Failed testing Open actions include Open criteria for material evaluation of test results and dimension and re-perform designated inspections.
January 31, 2014 PER BJV743J Overload Failed testing Failed criteria Closed 821151 Heaters criteria for inconsequential to overload resistance and heater operation. Pre-dimensions installation testing verifies proper operation.
January 31, 2014 PER 826067 BVT390J Cable Splices Failed testing Deficient parts would have Closed criteria for wire been self-revealing during size dimensions installation. Material will be scrapped.
January 31, 2014 PER 826791 AWT096Y Fuses Failed testing Open actions include final Open 0.125A criteria for current evaluation for carrying capacity consequences of failure.
Evaluate CGD acceptance criteria.
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ENCLOSURE Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report Status Report SR/PER CATID Item Failure Disposition Status Date Number Description Description (Open/
Closed)
January 31, 2014 PER 828735 BAG502L Fuses Failed testing Open actions include Open 1.6A criteria for current reviewing purchases and clearing time test results, removing fuses from inventory.
January 31, 2014 PER 830725 BVC946R Terminal Lugs Failed testing Open actions include Open criteria for material testing additional material type with alternate techniques January 31, 2014 PER 830726 BYB188W Terminal Lugs Failed testing Open actions include Open criteria for material testing additional material type with alternate techniques January 31, 2014 PER 823813 BYM865Q Terminal Lugs Failed testing Revised material attributes Closed criteria for material for copper concentration.
type January 31, 2014 PER 825115 CFF597C Polyethylene Failed testing Retested tubing to proper Closed Tubing criteria for test pressure.
pressure integrity January 31, 2014 PER 826424 BYL296B Insulating Tape Failed testing Initial criteria not critical. Closed criteria for tensile Revised criteria and strength retested for tape thickness and di-electric strength.
January 31, 2014 PER 820855 CCA611R Pulley Failed testing Incorrect material specified Closed Bushings criteria for material based on current type manufacturing. Material acceptable to originally supplied material type.
January 31, 2014 PER 825131 BQX704E Mandrel Pop Failed testing Incorrect material specified Closed Rivets criteria for material for mandrel. Revised type material type and tested additional samples for acceptance..
January 31, 2014 PER 823816 CPV360D Cable Splices Failed testing Open actions include Open criteria for material evaluation of acceptable type copper concentration, revision of CGD package and retest of material.
January 31, 2014 PER 828659 CEH294T Pressure Failed testing Open actions include Open Switch criteria for weight revision of CGD package to include seismic criteria, issue test reports and acceptance evaluation.
January 31, 2014 PER 823818 BRN013X Resistors Failed testing Incorrect dimensional Closed criteria for tolerances applied.
dimensions Revised CGD package and amended dimensional test report for acceptance.
January 31, 2014 PER 824184 CFP436V Brass Tubing Failed testing Revised criteria to brass Closed Unions criteria for material alloy. A brass alloy plus type pressure testing supported acceptance.
January 31, 2014 PER 821083 CGX850P Brass Tubing Failed testing Revised criteria to brass Closed Unions criteria for material alloy. A brass alloy plus type pressure testing supported acceptance.
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ENCLOSURE Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report In addition to the previously identified testing failures, TVA provided an update on the QA Audit finding regarding conditional dedication checks that lacked sufficient information needed to ensure successful completion of the task in Reference 4. In the update, TVA indicated that an extent of condition evaluation resulted in 13 problem event reports (PERs) identifying potential incomplete documentation of conditional dedication. After further evaluation, there were four instances where the item was not installed and one instance where the required conditional dedication documentation was located in the work order. The remaining eight PERs were closed out based on a combination of: (1) performance of operability reviews, (2) review of surveillance testing to verify component and item performance, (3) identifying documentation of work order steps that fulfills the conditional dedication requirements, and/or (4) completion of actions to verify the adequacy of the installed item. No operability concerns were identified during PER review and closeout.
RECENTLY IDENTIFIED ISSUES:
The following testing failures were recently identified and entered into the corrective action program.
Problem Evaluation Report 845971 was initiated to identify and address contact chatter failure of HFA Relay (CATID CFB485C) that was seismically tested by a third party qualifier. The relay failed the test criteria of electrical contacts not to change state for a duration of more than 0.002 seconds (2 milliseconds (ms)). The longest identified chatter for Normally Closed (NC) contacts was 66.4 ms and longest identified chatter for Normally Open (NO) contacts was 10.0 ms. The failure was evaluated, identifying potential operability concerns since relays from this lot were installed in 18 locations across the site during a planned replacement effort. The installed relays were found operable, but non-conforming. The remaining material was designated to be downgraded from dedicated safety related material to quality related. This condition will be further evaluated, as described in the CGD Recovery Project Plan.
Problem Evaluation Report 842727 was initiated to identify and address failure of initial critical characteristics testing criteria for dimensions of Resistor (CATID BVT503M). The acceptance criteria and tolerance for resistor length and lead length values were selected based on incorrect application of the manufacturers data sheets. The dimensional test report identified the resistor length - 0.562 +/- 0.031 and lead length - 1.50 minimum. Acceptance criterion for resistor length was revised to - 0.687 maximum based on applying the maximum acceptable manufacturing deviation. The lead length was revised to 1.50 +/- 0.125, applying the correct tolerance. From an original inventory of 66 resistors, 24 were initially subjected to non-destructive testing and the remaining inventory remained on hold pending further evaluation. In accordance with the corrective action plan, an appropriate sample size (34 resistors from the original quantity of 66) was dimensionally checked to the revised criteria. All 34 resistors met the dimensional criteria and were recorded on an inspection report (Note: The CGD package revision designated 24 resistors for dimensional verification). Based on corrective actions, a material acceptance evaluation has been completed and the resistor (CATID BVT503M) has been released from Hold status.
Problem Evaluation Report 842713 was initiated to identify and address failure of initial critical characteristics testing criteria for current clearing time of 30 Amp Fuse (CATID BLA352D). The acceptance criteria is open > 10 seconds when five times (150 amps) the current rating is applied to the fuse. One fuse of four tested failed the 150 amp test, by opening at 9.86 E 4 of 9
ENCLOSURE Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report seconds. The acceptance criterion for current clearing time and associated tolerances are based on manufacturers time-current curves and UL test standards. From an original inventory of 26 fuses, four were initially subjected to the 150 amp destructive test. Four were also subjected to the 60 amp destructive test during the original testing and the remaining inventory remained on hold pending further evaluation. In accordance with the corrective action plan, an expanded sample of five additional fuses was tested at five times (150 amp) the current rating with an acceptance criteria of open > 10 seconds. All five of these fuses met the acceptance criteria with times recorded on a new test report. Based on acceptable expanded sampling testing, a material acceptance evaluation was completed. CATID BLA352D for fuses has been released from Hold status.
Problem Evaluation Report 842712 was initiated to identify and address failure of initial critical characteristics testing criteria for current clearing time of 200 Amp Fuse (CATID BLA345A).
The acceptance criteria is open > 10 seconds when five times (1000 amps) the current rating is applied to the fuse. One fuse of three failed the 1000 amp test, by opening at 8.72 seconds.
The acceptance criterion for current clearing time and associated tolerances are based on manufacturers time-current curves and UL test standards. From an original inventory of 14 fuses, three were initially subjected to the 1000 amp destructive test. Three were also subjected to the 400 amp destructive test and the remaining inventory remained on hold pending further evaluation. In accordance with the corrective action plan, an expanded sample of four additional fuses were tested at five times (1000 amp) the current rating with an acceptance criteria of open > 10 seconds. All four of these fuses met the acceptance criteria with times recorded on a new test report. Based on acceptable expanded sampling testing, a material acceptance evaluation was completed. CATID BLA345A for fuses has been released from Hold status.
Problem Evaluation Report 842728 was initiated to identify and address failure of initial critical characteristics testing criteria for current clearing time of 35 amp fuses (CATID CFD755Y). The current clearing time acceptance criteria was incorrectly selected based on the manufacturers time-current curve and UL 248 Standard, (apply 70 amps +10/-0%, open < 2 minutes), with fuse opening values between 2 minutes, 44.91 seconds and 3 minutes, 30.40 seconds. The failure was evaluated, identifying that the maximum clearing time was applied incorrectly. The CGD package was revised, which set current clearing time acceptance criteria to open < 6 minutes
(<360 seconds). In accordance with the corrective action plan, additional samples were destructively tested and a new lab report was provided with acceptable results reported. The material was evaluated as acceptable based on the initial results, additional testing and revision to the CGD documents. CATID CFD755Y for the fuses has been released from Hold status.
Problem Evaluation Report 842703 was initiated to identify and address failure of initial critical characteristics testing criteria for leakage current and working voltage of 1.8 microfarad Capacitor (CATID BWA522W). Working voltage is dependent on acceptable leakage current to obtain acceptance results. The acceptance criteria of < 0.7 micro amps leakage current when working voltage 50 WVDC (Working Voltage DC) is applied to the capacitor as a non-destructive test. One capacitor of 32 tested failed the leakage current test, with a value of 150.0 micro amps at 50 WVDC. The original test criterion for leakage current and the associated tolerances are based on manufacturers published data sheets. The remaining inventory, from an initial 949 quantity, remained on hold pending further evaluation. In accordance with the corrective action plan, an expanded sample of 33 additional capacitors were tested for leakage current and working voltage with the same acceptance criteria (< 0.7 micro amps). All 33 capacitors of the expanded sample met the acceptance criteria with leakage current values E 5 of 9
ENCLOSURE Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report recorded on a new test report. Based on acceptable expanded sampling testing, a material acceptance evaluation was completed and the capacitors (CATID BWA522W) have been released from Hold status.
Problem Evaluation Report 853916 was initiated to identify and address failure of initial critical characteristics testing criteria for lead length dimensions of resistors (CATID CAC064M). The dimensional tolerance acceptance criterion was incorrectly specified based on decimal placement error. The lead length tolerance was specified as +/- 0.0125 and should have been
+/- 0.125. As a result, all 27 resistors inspected from the inventory population of 161 failed the lead length measurement. The failure was evaluated, identifying the decimal error. The CGD package was revised, which set lead length tolerance acceptance criteria to +/- 0.125. In accordance with the corrective action plan, the test report was amended with acceptable results reported, with all 27 resistors originally inspected passing the lead length acceptance criteria.
The material was evaluated as acceptable based on the initial dimensional results and revision to the CGD documents and the resistors (CATID CAC064M) can be released from Hold status.
Problem Evaluation Report 842702 was initiated to identify and address failure of initial critical characteristics testing criteria for length dimensions of 1/4 inch brass air conditioning service access valve (CATID APD135T). The dimensional tolerance acceptance criteria were applied based on a supplier provided drawing without considering the end use of the component. The length dimension and tolerance was specified as 3.062 +/- 0.003 where a minimum dimension was adequate. The access valve is used during maintenance activities where a precise length measurement is not critical for connection of Freon evacuation equipment. As a result, all four access valves inspected from the inventory population of 11 failed the length measurement acceptance criteria. The CGD package was revised, which set length acceptance criteria to 2.75 minimum. In accordance with the corrective action plan, the remaining inventory was inspected to the revised dimensional acceptance criteria and a test inspection report issued with acceptable results reported, with all five (5) available access valves passing the length criteria.
The material was evaluated as acceptable based on dimensional results and revision to the CGD documents. The valves (CATID APD135T) have been released from Hold status.
Problem Evaluation Report 860042 was initiated to identify and address failure of initial critical characteristics testing criteria for current clearing time of 35 Amp Fuses (CATID ADM954A).
The acceptance criteria is to open > 10 seconds when five times (175 amps) the current rating is applied to the fuse. Four fuses of four failed the 175 amp test, by opening between 5.75 to 8.77 seconds. The acceptance criteria for current clearing time and associated tolerances are based on manufacturers time-current curves and UL test standards. From an original inventory of 40 fuses, eight were subjected to the destructive testing. Four were also subjected to the 70 amp destructive test, which passed, and the remaining inventory remained on hold pending further evaluation. None of the fuses were installed in safety related applications; therefore, this issue does not pose an operability concern. In accordance with the corrective action plan, the material was designated to be scrapped to prevent use in the plant.
Problem Evaluation Report 845579 was initiated to identify and address failure of initial critical characteristics testing criteria for wire size dimension of splice (CATID BLN398N). The dimensional wire size acceptance criteria were specified as #22 AWG to #14 AWG. One splice of 49 sample pieces failed to meet the acceptance criteria by measuring #14 AWG to #14 AWG.
The failure was evaluated, identifying the potential for a mixed bin of materials. A discrepancy of this type is expected to be identified prior to installation by the technician based on E 6 of 9
ENCLOSURE Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report qualification, visual appearance (non-insulated splice) and proper crimping tools required. Of the original 420 splices in inventory, the test batch and remaining stock remain on hold pending further evaluation. This condition will be further evaluated, as described in the CGD Recovery Project Plan, to determine CGD item acceptability.
Problem Evaluation Report 842128 was initiated to identify and address failure of initial critical characteristics testing criteria for volumetric flow rate of exhaust valves (CATID CVD369R). The volumetric flow rate acceptance criteria were specified as > 300 SCFM @ 85 psig. Of four valves in inventory, three valves non-destructively tested failed to meet the acceptance criteria with failure values at 249, 239 and 248 SCFM. A review of previously issued inventory was performed, identifying a valve issued and installed in a safety related application. The installed location has been evaluated and does not present an operability concern. This condition will be further evaluated , as described in the CGD Recovery Project Plan, to determine CGD item acceptability.
Problem Evaluation Report 862599 was initiated to identify and address failure of initial critical characteristics testing criteria for diameter and length dimension of sleeve fitting (CATID CFM395R). The dimensional acceptance criteria were specified as diameter = 0.38 +/- 0.005 and length = 0.41 +/- 0.005. Four of six sample pieces failed to meet the acceptance criteria by measuring diameter = 0.37and 0.38 and length = 0.39 to 0.42. The failure was evaluated, identifying that the dimensional tolerances were specified incorrectly and dimensions in the inspection report were recorded to incorrect significant digits. Of the original nine sleeves in inventory, the test batch and remaining stock remain on hold pending further evaluation. The CGD package was revised with actions assigned to perform additional dimensional inspection of the remaining lot, as described in the corrective action plan, to determine CGD item acceptability.
Problem Evaluation Report 844628 was initiated to identify and address failure of initial critical characteristics testing criteria for contact resistance of overload relay (CATID CAA979N). The contact resistance acceptance criteria were specified as < 1 Ohm. One overload relay of nine sample pieces failed to meet the acceptance criteria indicating an Open circuit on the overload contact. The failure was evaluated, identifying that the described failure would be considered Self Revealing due to failure being an open circuit on the overload contact. This contact would be tested in both positions (Open and Closed) prior to placing the component in service. One overload relay was found to be installed in a safety related application. Testing was performed to verify a similar open contact does not exist for the installed component. No operability concern was identified in the PER. A discrepancy of this type is expected to be identified during installation based on testing designated for safety related equipment. Of the original 19 overload relays in inventory, the test batch and remaining stock remain on hold pending further evaluation. This condition will be further evaluated, as described in the CGD Recovery Project Plan, to determine CGD item acceptability.
Problem Evaluation Report 841713 was initiated to identify and address failure of initial critical characteristics testing criteria for resistor length and lead length dimension of resistor (CATID CGJ609B). The dimensional acceptance criteria were specified as resistor length = 1.000 +/-
0.063 and lead length = 1.50 +/- 0.125. All seven of seven sample pieces failed to meet the acceptance criteria by measuring resistor length = 1.094 to 1.119 and lead length = 1.751 to 1.801. The failure was evaluated, identifying that the dimensional requirements were specified correctly. Of the original 25 resistors in inventory, the test batch and remaining stock remain on hold pending further evaluation. The 25 resistors represent the entire purchase quantity; E 7 of 9
ENCLOSURE Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report therefore, none were installed in the plant. This condition will be further evaluated, as described in the CGD Recovery Project Plan, to determine CGD item acceptability.
Problem Evaluation Report 848255 was initiated to identify and address failure of initial critical characteristics testing criteria for length dimension of fuse (CATID BYL400P). The dimensional acceptance criteria were specified as fuse length = 1.25 +/- 0.01. Sixteen of 27 sample pieces failed to meet the acceptance criteria by measuring between 1.228 and 1.264. The failure was evaluated, identifying that the dimensional requirements were specified correctly. Of the original 95 fuses in inventory, the test batch and remaining stock remain on hold pending further evaluation. All fuses tested passed testing for electrical criteria. To date, no material from CATID BYL400P has been identified as installed in safety related applications. This condition will be further evaluated, as described in the CGD Recovery Project Plan, to determine CGD item acceptability.
Problem Evaluation Report 845243 was initiated to identify and address failure of initial critical characteristics testing criteria for power rating of resistor (CATID CBB278A). The power rating acceptance criteria were specified as 12.5 watts applied for 15 minutes, resistance remains in tolerance of 200 Ohms +/- 10%, and with no physical damage. Six resistors of 23 sample pieces failed to meet the acceptance criteria by showing visible cracking after the test. Multiple resistors were identified to be installed in a safety related applications. Preventative maintenance tasks routinely inspect the resistors for cracking. Of the original 79 overload relays in inventory, the test batch and remaining stock remain on hold pending further disposition. This condition will be further evaluated, as described in the CGD Recovery Project Plan, to determine CGD item acceptability.
Problem Evaluation Report 867205 was initiated to identify and address failure of initial critical characteristics testing criteria for current clearing time of 7.5 Amp Fuses (CATID BVA247Y).
The acceptance criteria of open between 12 to 240 seconds when two times (15 amps) the current rating was applied to the fuse. Two fuses, from a sample size of eight, failed the 15 amp test by opening at 11.42 and 9.23 seconds. The acceptance criteria for current clearing time and associated tolerances are based on manufacturers time-current curves and UL test standards. From an original inventory of 78 fuses, eight were subjected to the destructive testing. Six fuses passed the 15 amp destructive test and the remaining inventory remained on hold pending further evaluation. Initial evaluation of the failure recommends testing an expanded sample of nine additional fuses. This condition will be further evaluated, as described in the CGD Recovery Project Plan, to determine CGD item acceptability.
Problem Evaluation Report 867221 was initiated to identify and address failure of initial critical characteristics testing criteria for current clearing time of 700 Amp Fuse (CATID BDL448P).
The original acceptance criteria, of open between 1.2 and 11 seconds when two times (1400 amps) the current rating is applied to the fuse, was based on a manufacturers time-current curve. One fuse, from a sample size of one, failed the 1400 amp test, by opening at 229 seconds. New acceptance criteria was developed using the UL 248-1 standard. From an original inventory of five fuses, one was subjected to destructive testing. The remaining inventory remained on hold pending further evaluation. Initial evaluation of the failure recommends testing an expanded sample of two additional fuses to the revised current clearing criteria. This condition will be further evaluated, as described in the CGD Recovery Project Plan, to determine CGD item acceptability.
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ENCLOSURE Tennessee Valley Authority (TVA) Nuclear Power Group Commercial Grade Dedication Recovery Project - April 2014 Status Report Problem Evaluation Report 867220 was initiated to identify and address failure of initial critical characteristics testing criteria for current clearing time of 15 Amp Fuses (CATID BYF689H).
The acceptance criteria were to open between 12 and 120 seconds when two times (15 amps) the current rating was applied to the fuse. One fuse of two failed the 30 amp test, by opening at 10.72 seconds. The acceptance criteria for current clearing time and associated tolerances are based on manufacturers time-current curves and UL test standards. From an original inventory of 13 fuses, two were subjected to the destructive testing. One fuse passed the 30 amp destructive test and the remaining inventory remained on hold pending further evaluation. Initial evaluation of the failure recommends testing an expanded sample of three additional fuses.
This condition will be further evaluated, as described in the CGD Recovery Project Plan, to determine CGD item acceptability.
Problem Evaluation Report 863778 was initiated to identify and address failure of initial critical characteristics testing criteria for current clearing time of 0.5 Amp Fuses (CATID BYV699G).
The acceptance criteria were to open < 120 seconds when two times (1 amp) the current rating was applied to the fuse. Four fuses out of an inventory of 30 were tested, and all four failed the 1 amp test, by opening > 240 seconds. The acceptance criteria for current clearing time and associated tolerances are based on manufacturers time-current curves and UL test standards.
The remaining inventory remained on hold pending further evaluation. Based on initial review, no operability concerns were identified. This condition will be further evaluated, as described in the CGD Recovery Project Plan, to determine CGD item acceptability.
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