|
---|
Category:INTERNAL OR EXTERNAL MEMORANDUM
MONTHYEARML20211K8611999-09-0101 September 1999 Informs That There Has Been Some Confusion Re Recently Issued ODCM Generic Section Rev Which Needs to Be Clarified. Clarifications Are Listed ML20210P1361999-08-0404 August 1999 Notification of 990817 Meeting with Util in Rockville, Maryland to Discuss Status of Licensing Actions Submitted by Comm Ed & Plan for Proposed Licensing Workshop ML20210C7061999-07-16016 July 1999 Forwards Facility Submitted Outline & Initial Exam Submittal for Operator Licensing Exams Administered During Wk of 990607 ML20209H2231999-07-16016 July 1999 Forwards Operator Licensing Exam Repts 50-456/99-301(OL) & 50-457/99-301(OL) of Exam Administered During Wk of 990607 ML20206Q2751999-05-13013 May 1999 Forwards Official Case File for DPO-99-1,request of Review of Concerns Related to TS Setpoints & Allowable Value for Instrumentation Under Formal DPO Procedures,For Disposition in Accordance with Provisions of NRC MD 10.159 ML20206E9331999-05-0303 May 1999 Notification of 990524 Meeting with Commonwealth Edison,Co in Rockville,Md to Discuss Technical Issues Related to Proposed re-rack of SFPs at Braidwood Station & Byron Station ML20206Q3211999-02-19019 February 1999 Responds to e-mail Message Sent on 980202,re Status of Staff Actions on Recipient Dpv.With Regard to Dpv Concerning Dynamic Testing of Instrument Channels at Braidwood,Staff Pursuing Resolution of Issue with Licensee ML20206Q3391999-01-0505 January 1999 Provides Update on Status of Resolution of follow-up Actions from Resolution of Dpv on Dynamic Testing of Instrumentation at Braidwood Station ML20155E7361998-11-0202 November 1998 Forwards NRC Operator Licensing Exam Repts 50-456/98-305 & 50-457/98-305 for Tests Administered on 980914 ML20154G2361998-10-0707 October 1998 Responds to Memo Sent on 981002 Re Resolution of follow-up Actions for NRR Differing Professional View Panel on Dynamic Testing of Instrumentation at Plant ML20196D7921998-10-0202 October 1998 Forwards Comments Related to Staff Responses to follow-up Actions Re Dynamic Testing of Instrument Channels at Braidwood ML20196D7801998-09-21021 September 1998 Informs That Staff Completed Review of follow-up Actions Identified in Memo from Bw Sheron to Ba Boger, on Dymanic Testing of Instrumentation Channels at Braidwood ML20151V2951998-09-0202 September 1998 Informs That Braidwood Station Concurs with Encl Proposed 980904 Util Response to NRC Re IPEEE ML20197C8041998-09-0202 September 1998 Informs That Braidwood Station Concurs with Proposed Encl Response to NRC Re RPV Integrity at Braidwood & Byron Stations ML20197C8301998-09-0101 September 1998 Informs That Rev 2 to Calculation BYR98-109/BRW-98-339-E Has Been Reviewed & Found Acceptable for Transmittal to Nrc. Draft Util Ltr Re Thermo-Lag Ampacity Derating Factor Calculation,Encl ML20237D4331998-08-21021 August 1998 Notification of 980903 & 04 Meetings W/Util in Rockville,Md to Discuss Technical Issues Related to Byron & Braidwood Improved Std TSs Conversion,Including Section 3.3,beyond Scope Issues,Closeout Packages & Amends to Current TSs ML20196D7211998-08-0404 August 1998 Responds to 980720 Memo from Sj Collins to Lj Callan Re When & How Mesac Approved.Licensee Installed Mirco Electronic Surveillance & Calibration (Mesac) Sys Measurement & Test Equipment as Backup Sys to Normal M&TE ML20196D7711998-07-22022 July 1998 Discusses Staff Review of Braidwood Mesac System ML20249A2231998-06-12012 June 1998 Notification of 980625-26 Meeting W/Util in Rockville,Md to Discuss Technical Issues Re Byron & Braidwood Improved Std TSs Conversion ML20216B6731998-05-11011 May 1998 Discusses Closure of TAC M94439 for Braidwood,Unit 1,steam Generator Replacement ML20217P0131998-04-29029 April 1998 Forwards NRC Approved Operator Licensing Exam (Facility Outline & Initial Exam Submittal & as-given Operating Exam) for Tests Administered During Wk of 980413 ML20217P0731998-04-29029 April 1998 Forwards NRC Operator Licensing Exam Repts 50-456/98-304(OL) & 50-457/98-304(OL) (Including Completed & Graded Tests) for Tests Administered on 980413-15 ML20217E3881998-04-23023 April 1998 Notification of 980506 & 07 Meetings W/Util in Rockville,Md to Discuss Technical Issues Re Plants Improved STS Conversion ML20216H3401998-03-17017 March 1998 Notification of 980331-0402 Meeting W/Util in Rockville,Md to Discuss Reviewer Comments on Byron & Braidwood Improved Std TS Submittal ML20216H6971998-03-17017 March 1998 Notification of 980326 Meeting W/Commonwealth Edison Co in Lisle,Il to Discuss Comed Request to Consolidate near-site Emergency Operations Facility Into Single Central EOF ML20203G8551998-02-23023 February 1998 Notification of 980305 Meeting W/Util in Rockville,Md to Discuss Status of Byron & Braidwood Licensing Issues ML20198G4921998-01-0707 January 1998 Forwards Facility Submitted Outline,Initial Exam Submittal & as Given Operating Exam for Test Administered During Wk of 971006 at Plant ML20198J6881998-01-0707 January 1998 Forwards NRC Operator Licensing Exam Rept w/as-given Written Exam for Tests Administered During Wk of 971006 at Plant ML20202E5831997-11-25025 November 1997 Notification of 971215 Meeting W/Commonwealth Edison Co in Rockville,Md to Review Schedule for Listed Plants Improved Std TS Conversion & Supplemental Submittals ML20203C3621997-11-25025 November 1997 Revised Notification W/New Starting Time of Meeting W/Ceco on 971215 in Rockville,Maryland to Discuss Review Schedule Byron & Braidwood Improved TS Conversion & Supplemental Submittals ML20202D2221997-11-25025 November 1997 Notification of Meeting W/Ceco on 971211 in Rockville,Md to Discuss Proposed Mod to Methodology for Estimating SG Tube Leakage Attributable to Outer Diameter Stress Corrosion Crack Indications Restricted from Burst for Plant SGs ML20236N5111997-10-22022 October 1997 Fowards Staff Response to 960912 TIA Re Containment Spray Additive Sys Conformance W/Design Basis & Tss.Analysis Concluded That 2,400-2,600 Ppm in RWST Acceptable ML20217K8271997-10-16016 October 1997 Notification of 971024 Meeting W/Util to Discuss Results of Comed Investigation Into Sensitivity of Proposed voltage- Dependent Growth Rates to Binning Strategy for ODSCC Indicators ML20212A1501997-10-15015 October 1997 Forwards Response for NRC RAI Re SG Interim Plugging Criteria 90 Day Rept for Braidwood,Unit 1 Sixth Refuel Outage (A1R06).Station Concurs W/Response as Proposed for CE ML20217D4261997-09-30030 September 1997 Informs of Scheduled Visits W/Nuclear Services at Gpu on Nov 14th & Visit at Commonwealth Edison on Dec 3rd & Would Like to Receive Any Info Available.Supporting Documentation Encl ML20217B3901997-09-23023 September 1997 Forwards Questions Re Ceco Submittal of Revised SG Tube Rupture Analysis for Byron,Unit 1 & Braidwood,Unit 1 ML20149L1901997-07-22022 July 1997 Notification of 970723 Meeting W/Commonwealth Edison Co in Rockville,Md to Discuss Results of Spring 1997,Braidwood,1 SG Tube Eddy Current Insp.Time of Meeting Rescheduled ML20149F2731997-07-0303 July 1997 Notification of 970723 Meeting W/Util in Rockville,Md to Discuss Results of Spring 1997 Plant,Unit 1 SG Tube Eddy Current Insp Including Determination of Impact of Data ML20138D2781997-04-28028 April 1997 Notification of 970430 Meeting W/Util in Rockville,Md to Discuss Results of EC Insps of Plant SGs Conducted During Present Refueling Outage IA-97-178, Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission1997-04-18018 April 1997 Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission ML20217D5461997-04-18018 April 1997 Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission ML20147J2391997-04-0909 April 1997 Notification of Meeting on 970416 W/Util in Rockville,Md to Discuss Overall Response & Present Addl Details Re Performance Indicators Used to Monitor Performance Stations ML20236N0071997-04-0707 April 1997 Responds to Request for TS Interpretation on Containment Vent & Drain Valves at Braidwood ML20138J7671997-02-0505 February 1997 Informs That NRC Plans to Administer Generic Fundamentals Exam Section of Written Operator Licenseing Exam on 970409. Ltr W/Copy to Chief,Operator Licensing Branch Must Be Submitted to Listed Address in Order to Register Personnel ML20149M6901997-01-19019 January 1997 Notification of 970128 Meeting W/Commonwealth Edison Co to Discuss Licensee Proposed Program for Use of Mixed Oxide Fuel ML20133J5811997-01-15015 January 1997 Notification of 970122 Meeting W/Util in Rockville,Md to Discuss Licensee Status of Program for Replacement & Operation of New SG at Byron 1 & Braidwood 1 ML20133J4821997-01-15015 January 1997 Notification of 970123 Meeting W/Licensees in Rockville,Md to Discuss Contents of Plants TS Conversion Submittal, Provide Staff Comments Based on Initial Screening Review & Discuss Review Schedule ML20196D8881997-01-0202 January 1997 Provides Results of Review of Dpv That Was Expressed in 961017 Memo Re Dynamic Testing of Instrumentation Channels at Braidwood ML20196D8011997-01-0202 January 1997 Forwards NRR Ad Hoc Dpv Review of Recipient Differing Professional View Re Dynamic Testing of Instrumentation Channels at Braidwood,Per 961017 Memo ML20196D8671997-01-0202 January 1997 Submits Review of Ad Hoc NRR Dpv Review Panel Re 961017 Memo Dpv on Dynamic Testing of Instrumentation Channels at Braidwood 1999-09-01
[Table view] Category:MEMORANDUMS-CORRESPONDENCE
MONTHYEARML20211K8611999-09-0101 September 1999 Informs That There Has Been Some Confusion Re Recently Issued ODCM Generic Section Rev Which Needs to Be Clarified. Clarifications Are Listed ML20210P1361999-08-0404 August 1999 Notification of 990817 Meeting with Util in Rockville, Maryland to Discuss Status of Licensing Actions Submitted by Comm Ed & Plan for Proposed Licensing Workshop ML20209H2231999-07-16016 July 1999 Forwards Operator Licensing Exam Repts 50-456/99-301(OL) & 50-457/99-301(OL) of Exam Administered During Wk of 990607 ML20210C7061999-07-16016 July 1999 Forwards Facility Submitted Outline & Initial Exam Submittal for Operator Licensing Exams Administered During Wk of 990607 ML20206Q2751999-05-13013 May 1999 Forwards Official Case File for DPO-99-1,request of Review of Concerns Related to TS Setpoints & Allowable Value for Instrumentation Under Formal DPO Procedures,For Disposition in Accordance with Provisions of NRC MD 10.159 ML20206E9331999-05-0303 May 1999 Notification of 990524 Meeting with Commonwealth Edison,Co in Rockville,Md to Discuss Technical Issues Related to Proposed re-rack of SFPs at Braidwood Station & Byron Station ML20206Q3211999-02-19019 February 1999 Responds to e-mail Message Sent on 980202,re Status of Staff Actions on Recipient Dpv.With Regard to Dpv Concerning Dynamic Testing of Instrument Channels at Braidwood,Staff Pursuing Resolution of Issue with Licensee ML20206Q3391999-01-0505 January 1999 Provides Update on Status of Resolution of follow-up Actions from Resolution of Dpv on Dynamic Testing of Instrumentation at Braidwood Station ML20155E7361998-11-0202 November 1998 Forwards NRC Operator Licensing Exam Repts 50-456/98-305 & 50-457/98-305 for Tests Administered on 980914 ML20154G2361998-10-0707 October 1998 Responds to Memo Sent on 981002 Re Resolution of follow-up Actions for NRR Differing Professional View Panel on Dynamic Testing of Instrumentation at Plant ML20196D7921998-10-0202 October 1998 Forwards Comments Related to Staff Responses to follow-up Actions Re Dynamic Testing of Instrument Channels at Braidwood ML20196D7801998-09-21021 September 1998 Informs That Staff Completed Review of follow-up Actions Identified in Memo from Bw Sheron to Ba Boger, on Dymanic Testing of Instrumentation Channels at Braidwood ML20197C8041998-09-0202 September 1998 Informs That Braidwood Station Concurs with Proposed Encl Response to NRC Re RPV Integrity at Braidwood & Byron Stations ML20151V2951998-09-0202 September 1998 Informs That Braidwood Station Concurs with Encl Proposed 980904 Util Response to NRC Re IPEEE ML20197C8301998-09-0101 September 1998 Informs That Rev 2 to Calculation BYR98-109/BRW-98-339-E Has Been Reviewed & Found Acceptable for Transmittal to Nrc. Draft Util Ltr Re Thermo-Lag Ampacity Derating Factor Calculation,Encl ML20237D4331998-08-21021 August 1998 Notification of 980903 & 04 Meetings W/Util in Rockville,Md to Discuss Technical Issues Related to Byron & Braidwood Improved Std TSs Conversion,Including Section 3.3,beyond Scope Issues,Closeout Packages & Amends to Current TSs ML20196D7211998-08-0404 August 1998 Responds to 980720 Memo from Sj Collins to Lj Callan Re When & How Mesac Approved.Licensee Installed Mirco Electronic Surveillance & Calibration (Mesac) Sys Measurement & Test Equipment as Backup Sys to Normal M&TE ML20196D7711998-07-22022 July 1998 Discusses Staff Review of Braidwood Mesac System ML20249A2231998-06-12012 June 1998 Notification of 980625-26 Meeting W/Util in Rockville,Md to Discuss Technical Issues Re Byron & Braidwood Improved Std TSs Conversion ML20216B6731998-05-11011 May 1998 Discusses Closure of TAC M94439 for Braidwood,Unit 1,steam Generator Replacement ML20217P0731998-04-29029 April 1998 Forwards NRC Operator Licensing Exam Repts 50-456/98-304(OL) & 50-457/98-304(OL) (Including Completed & Graded Tests) for Tests Administered on 980413-15 ML20217P0131998-04-29029 April 1998 Forwards NRC Approved Operator Licensing Exam (Facility Outline & Initial Exam Submittal & as-given Operating Exam) for Tests Administered During Wk of 980413 ML20217E3881998-04-23023 April 1998 Notification of 980506 & 07 Meetings W/Util in Rockville,Md to Discuss Technical Issues Re Plants Improved STS Conversion ML20216H3401998-03-17017 March 1998 Notification of 980331-0402 Meeting W/Util in Rockville,Md to Discuss Reviewer Comments on Byron & Braidwood Improved Std TS Submittal ML20216H6971998-03-17017 March 1998 Notification of 980326 Meeting W/Commonwealth Edison Co in Lisle,Il to Discuss Comed Request to Consolidate near-site Emergency Operations Facility Into Single Central EOF ML20203G8551998-02-23023 February 1998 Notification of 980305 Meeting W/Util in Rockville,Md to Discuss Status of Byron & Braidwood Licensing Issues ML20198J6881998-01-0707 January 1998 Forwards NRC Operator Licensing Exam Rept w/as-given Written Exam for Tests Administered During Wk of 971006 at Plant ML20198G4921998-01-0707 January 1998 Forwards Facility Submitted Outline,Initial Exam Submittal & as Given Operating Exam for Test Administered During Wk of 971006 at Plant ML20202D2221997-11-25025 November 1997 Notification of Meeting W/Ceco on 971211 in Rockville,Md to Discuss Proposed Mod to Methodology for Estimating SG Tube Leakage Attributable to Outer Diameter Stress Corrosion Crack Indications Restricted from Burst for Plant SGs ML20202E5831997-11-25025 November 1997 Notification of 971215 Meeting W/Commonwealth Edison Co in Rockville,Md to Review Schedule for Listed Plants Improved Std TS Conversion & Supplemental Submittals ML20203C3621997-11-25025 November 1997 Revised Notification W/New Starting Time of Meeting W/Ceco on 971215 in Rockville,Maryland to Discuss Review Schedule Byron & Braidwood Improved TS Conversion & Supplemental Submittals ML20236N5111997-10-22022 October 1997 Fowards Staff Response to 960912 TIA Re Containment Spray Additive Sys Conformance W/Design Basis & Tss.Analysis Concluded That 2,400-2,600 Ppm in RWST Acceptable ML20217K8271997-10-16016 October 1997 Notification of 971024 Meeting W/Util to Discuss Results of Comed Investigation Into Sensitivity of Proposed voltage- Dependent Growth Rates to Binning Strategy for ODSCC Indicators ML20212A1501997-10-15015 October 1997 Forwards Response for NRC RAI Re SG Interim Plugging Criteria 90 Day Rept for Braidwood,Unit 1 Sixth Refuel Outage (A1R06).Station Concurs W/Response as Proposed for CE ML20217D4261997-09-30030 September 1997 Informs of Scheduled Visits W/Nuclear Services at Gpu on Nov 14th & Visit at Commonwealth Edison on Dec 3rd & Would Like to Receive Any Info Available.Supporting Documentation Encl ML20217B3901997-09-23023 September 1997 Forwards Questions Re Ceco Submittal of Revised SG Tube Rupture Analysis for Byron,Unit 1 & Braidwood,Unit 1 ML20149L1901997-07-22022 July 1997 Notification of 970723 Meeting W/Commonwealth Edison Co in Rockville,Md to Discuss Results of Spring 1997,Braidwood,1 SG Tube Eddy Current Insp.Time of Meeting Rescheduled ML20149F2731997-07-0303 July 1997 Notification of 970723 Meeting W/Util in Rockville,Md to Discuss Results of Spring 1997 Plant,Unit 1 SG Tube Eddy Current Insp Including Determination of Impact of Data ML20138D2781997-04-28028 April 1997 Notification of 970430 Meeting W/Util in Rockville,Md to Discuss Results of EC Insps of Plant SGs Conducted During Present Refueling Outage ML20217D5461997-04-18018 April 1997 Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission IA-97-178, Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission1997-04-18018 April 1997 Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission ML20147J2391997-04-0909 April 1997 Notification of Meeting on 970416 W/Util in Rockville,Md to Discuss Overall Response & Present Addl Details Re Performance Indicators Used to Monitor Performance Stations ML20236N0071997-04-0707 April 1997 Responds to Request for TS Interpretation on Containment Vent & Drain Valves at Braidwood ML20138J7671997-02-0505 February 1997 Informs That NRC Plans to Administer Generic Fundamentals Exam Section of Written Operator Licenseing Exam on 970409. Ltr W/Copy to Chief,Operator Licensing Branch Must Be Submitted to Listed Address in Order to Register Personnel ML20149M6901997-01-19019 January 1997 Notification of 970128 Meeting W/Commonwealth Edison Co to Discuss Licensee Proposed Program for Use of Mixed Oxide Fuel ML20133J4821997-01-15015 January 1997 Notification of 970123 Meeting W/Licensees in Rockville,Md to Discuss Contents of Plants TS Conversion Submittal, Provide Staff Comments Based on Initial Screening Review & Discuss Review Schedule ML20133J5811997-01-15015 January 1997 Notification of 970122 Meeting W/Util in Rockville,Md to Discuss Licensee Status of Program for Replacement & Operation of New SG at Byron 1 & Braidwood 1 ML20196D8671997-01-0202 January 1997 Submits Review of Ad Hoc NRR Dpv Review Panel Re 961017 Memo Dpv on Dynamic Testing of Instrumentation Channels at Braidwood ML20196D8011997-01-0202 January 1997 Forwards NRR Ad Hoc Dpv Review of Recipient Differing Professional View Re Dynamic Testing of Instrumentation Channels at Braidwood,Per 961017 Memo ML20196D8881997-01-0202 January 1997 Provides Results of Review of Dpv That Was Expressed in 961017 Memo Re Dynamic Testing of Instrumentation Channels at Braidwood 1999-09-01
[Table view] |
Text
- __ _ _ _ _ _
/ h MAR 2 0 1986 MEMORANDUM FOR: Gary G. Zech, Chief, Vendor Program Branch FROM: W. S. Little, Director, Braidwood Project
SUBJECT:
BRAIDWOOD CONSTRUCTION DEFICIENCY REPORT REGARDING DEFECTIVE SPOT WELDS ON SYSTEMS CONTROL CORPORATION CABLE TRAY HANGERS Enclosed is an interim 10'CFR 50.55(e) report received from Commonwealth Edison Company. This information is provided for your review and followup.
If your staff has any questions please contact me.
W. S. Little, Director Braidwood Project
Enclosure:
As stated 8603250085 860320 PDR ADOCK 05000456 S PDR i
R RI J, ggf PeLke/jp Gardner Litt e G m ,,-
3/12/86 pgl 1l
i CommonweJth Edison One First National Plaza. Chicago. Ithnois Address Reply to Post Othee Box 767 Chicago. Ilknois 60690 March 6, 1986 Mr. James G. Keppler Regional Administrator Directorate of Inspection and Enforcement - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
SUBJECT:
Braidwood Station Units 1 and 2 10 CFR50.55(e) No. 86-03 30-Day Interim Report Defective Spot Welds on Cable Tray Hangers NRC Docket Nos. 50-456 and 50-457
Dear Mr. Keppler:
On January 21, 1986, Commonwealth Edison Company notified Mr. R. Gardner of your office of a deficiency reportable pursuant to 10 CFR 50.55(e) regarding defective spot welds on cable tray hanger strut material at the Braidwood Station. An extension in submitting this response was discussed with W.S. Little of your office. This letter provides information to fulfill the thirty-day reporting requirement and is considered an interim report.
Description of Deficiency During the installation of cable tray in Unit 2 containment, the Unit 2 electrical contractor G. K. Newberg identified installed cable tray hangers which had discrepant spot welds. G. K. Newberg initiated NCR 331-00001 and NCR 331-00002 which together identified thirty (30) cable tray hangers with discrepant spot welds. The cable tray hangers in question were prefabricated by Systems Control Corporation (SCC) utilizing PlOO4A Unistrut material. The P1004A is a spaced back to back channel fabricated out of two P1000 single channels held together by side plates which are spot welded to the channel at 3" on center. Some of the spot welds on the cable tray hangers which join the side plates to the channel as identified by G. K. Newberg appear to be improperly fused. G. K. Newberg submitted the.two NCR's to , _ ,
Commonwealth Edison Company for their evaluation.
l ibbHOIb/7'C)$'6 $[gp f MAR 7 1985 1
o 1
1 I
- , Upon review of the G. K. Newberg NCR's 331-00001 and '
331-00002 CECO initiated NCR 793. In performing the 50.55e reportability review of NCR 793, CECO determined that the identified l problem was reportable. In addition, CECO notified Unistrut Corporation of the problem. Unistrut made a visit to the Braidwood site and confirmed the P1004A material in question was their product and would review their records to help identify the source of the problem.
Analysis of Safety Implications The safety significance of the discrepant spot weld has not been fully assessed. Scoping analysis to date for cable tray hangers with significant discrepant spot welds in heavily loaded applications indicates that there is no safety significance. This preliminary conclusion will be verified as a result of the engineering evaluation.
Corrective Action Taken In order to determine the scope of this problem CECO decided to perform a walkdown of the installed cable tray hangers comprised of P1004A Unistrut members in Braidwood Units 1 & 2 .
Sargent & Lundy developed an inspection criteria to be used on the walkdown. Each of the members were inspected for spot weld fusion by observing for gaps between the side plate and base channel and then attempting to pass thin mylar through the welded area. Welds were considered discrepant if the thin mylar could be passed through the welded area.
The hangers in which discrepant welds have been observed were mapped indicating the location of each discrepant weld. The base channel control numbers were recorded for all hangers inspected.
The base channel control number indicates the year it was rolled, the operator of the rolling machine and the steel coil number. Furthermore, Unistrut Q.C. documentation references the control number. The results of this walkdown are summarized in the attached table.
The number of hanger members in which discrepant welds were found and the total number of hanger members inspected are shown for each control number identified with discrepant welds. This information was passed along to Unistrut for their review. A review of the control numbers of the discrepant material shows that the majority of the material was manufactured in the 1978 time frame. -
Unistrut concentrated their efforts on reviewing production and quality control records.
l
t t
Based on this records review Unistrut Corporation has
- established that 580 feet of rejected P1004A material was inadvertently shipped to SCC and used to supply cable tray hangers for the Byron /Braidwood project which was primarily used for Braidwood Unit 2. This shipment (1,000') was received by SCC in August 1979. This material consisted of rejected 20 foot pieces of P1004A material that were accumulated for rework during 1979. This material was partially reworked in July of 1979. The control numbers shown in the attached table with an 8 prefix would be considered suspect since they were produced in this time period.
. However, a significant number of adjacent discrepant spot welds have been observed only on control numbers 8E7806, 8E7829 and 8N7791. It appears that the suspect material was utilized primarily for Braidwood Unit 2 cable tray hangers. This is supported by.the results of the walkdown. In addition, Braidwood Unit 2 were the last hangers fabricated by SCC. Prior to the 1,000 foot shipment received in August of 1979, SCC had received P1004A shipments totaling 2,000 feet (1,500' - 1977, 500' - March 1979). This 2,000 i feet of nonsuspect material would be consumed by the earlier j scheduled units (Braidwood 1, Byron 1 & 2) before the suspect material was received by SCC in the August 1979 shipment.
i
- A comprehensive review of records by Unistrut indicates 1 that the inadvertent shipment of 580 feet of discrepant material was i an isolated occurrence. Quality Control (QC) records are maintained j for all material produced by Unistrut. All material which is
- rejected by QC is tagged and held for disposition. The 580 feet of suspect material was accumulated during 1979, tagged as rejected, and held for rework. The walkdown shows that some of the material was partially reworked. The disposition for this reject tag was never completed by Unistrut QC. The material was apparently shipped prior to completion of the rework and final QC acceptance. Unistrut i QC records show this to be the only case of a material reject tag with incomplete QC disposition, and therefore, considers it'to be an isolated case.
Based on construction schedule considerations, it was determined to replace the Unit 2 Containment hangers which contained ,
discrepant welds. The Unit 1 hangers will either be repaired or replaced. An engineering evaluation will be completed to assess the remaining hangers without discrepant welds but fabricated of the suspect control numbers. An evaluation will also be done to assess the adequacy of adjacent intact spot welds.
It is apparent that, in addition to the 580' of suspect material, there exist occasional discrepant spot welds. Unistrut expec.s that occasional discrepant spots may not be detected by theit Quality Assurance program. An engineering evaluation will be completed to assess this condition on a generic basis.
i
i L
In order to confirm our conclusion that this problem is isolated to cable tray hangers supplied by SCC, a walkdown was also completed for all installed conduit hangers in Units 1 & 2 which utilize Unistrut P1004A. There are 1275 conduit hangers utilizing P1004A of which discrepant welds were observed on only five hangers. Due to this low frequency of occurrence these discrepant welds are considered isolated cases. These hangers will be repaired or replaced. Conduit and junctiva box hangers have been fabricated in a later time period as compared to cable tray hangers. They have also been fabricated by a different contractor, Mechanical, Inc.
For these reasons, it has been concluded that the scope of the P1004A issue is isolated to cable tray hangers received from SCC.
Therefore no further action is planned for conduit and junction box hangers.
In summary, results of the Unistrut P1004A demonstrate that:
- 1. The scope of the issue is 580 feet of discrepant material which was inadvertently shipped to SCC and used to fabricate cable tray hangers. Walkdown data, supplemented by vendor information, leads to the conclusion that these cable tray hangers are primarily in Unit 2.
- 2. Occasional discrepant spot welds are expected by Unistrut for nonsuspect material. An engineering evaluation will be performed which should accept this condition on a generic basis.
- 3. An engineering evaluation will be performed for all cable tray hangers remaining with suspect control numbers. The control numbers shown in the attached table with an 8 prefix are considered suspect.
Please address any questions that you or your staff may have concerning this matter to this office.
Very truly yours H^^ hl u Anthony D. Miosi Nuclear Licensing Administrator ADM/ pay att.
cc: NRC Resident Inspector - Byron NRC Resident Inspector - Braidwood Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 ;
1387K l
L b
e I
ATTACHMENT l l
UNISTRUT P1004A WALKDOWN BRAIDWOOD 1 & 2 CABLE TRAY SUPPORTS CONTROL NUMBER HANGER MEMBERS NUMBERS DISCREPANT TOTAL INSPECTED UNIT 1 &
COMMON UNIT 2 7P3167 1 0 79 7P3351 2 0 16 8E7806 0 35 53
_ 8N7830 2 0 9 8E7829 1 10 22 8N7791 1 1 40 8N7792 1 0 30 OTHERS 0 0 146 TOTAL 8 46 395
, . _ .