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Category:CORRESPONDENCE-LETTERS
MONTHYEARML20217N5861999-10-22022 October 1999 Ack Receipt of Informing NRC of Steps Taken to Correct Violations Noted in Insp Rept 70-7002/99-09 Issued on 990827 ML20217H6911999-10-19019 October 1999 Ack Receipt of 990928 Application to Revise Technical Safety Requirements 2.2.3.15 & 2.7.3.14.Initial Administrative Review Finds Application Acceptable.Completion of Review Is Anticipated by 991215 ML20217N9141999-10-15015 October 1999 Forwards Rev 6 of NCS Cap,Providing Addl Details within Subtask 3.3,addl Ncsa/E Reviews & Establishes New Milestone to Conduct Addl Reviews IAW Procedure XP2=EG-NS1037, Review of Non-Priority 1 & 2 ML20217M2961999-10-15015 October 1999 Provides Addl Changes to Updated SAR Certificate Amend Request,Including Changes Made IAW Item 5 of Plan of Action Schedule for Compliance Plan Issue 2 & Changes That Resulted from Reevaluation of Autoclave head-to-shell O-ring ML20217G4671999-10-14014 October 1999 Forwards Proprietary Insp Rept 70-7002/99-207 on 990920-23. No Violations Noted.Under Provisions of Section 2.790(d), Repts Containing Info Related to Licensee MC&A Program, Exempt from Public Disclosure ML20217G1731999-10-14014 October 1999 Requests Addl Info Re Applications Dtd 990924,requesting Amends to Cocs for Paducah & Portsmouth GDPs for Revised QA Programs.Encl Identifies Specific Info Needed.Info Should Be Provided within 30 Days ML20217F5481999-10-0808 October 1999 Discusses Insp Rept 70-7002/99-12 on 990810-0920 at Ports- Mouth Gaseous Diffusion Plant.No Cited Violations of NRC Requirements Were Identified During Insp ML20217B6121999-10-0606 October 1999 Forwards Copy of Security Incident Log for Month of Sept 1999 ML20217A4781999-10-0404 October 1999 Forwards Revised Event Rept 99-17,for Event Resulting from Determination That Sprinkler Sys Not Capable of Meeting Operability Requirements.Caused by Mineral Deposits.Provided Following Completion of Root Cause Evaluation ML20212H5991999-09-27027 September 1999 Responds to Violations Noted in Insp Rept 70-7002/99-09. Corrective Actions:Engineering Evaluated Site Rail Track Insp Process for Improvement ML20216J7891999-09-27027 September 1999 Provides Required 30-day Event Rept 99-19 for Event That Resulted from Failure of Cascade Automatic Data Processing Data Processing Smoke Detection Sys at Portsmouth Gaseous Diffusion Plant.Encl 2 Is List of Commitments Made in Rept ML20212H1251999-09-24024 September 1999 Notifies NRC of Change in Regulatory Commitments Associated with Submittal Date for Update of Application SAR Chapter 3.Specifics of Commitment Changes of Listed ML20212H3801999-09-24024 September 1999 Responds to 990723 RAI Re 1999 Annual Update to Certification Applications ML20212G0551999-09-23023 September 1999 Provides Revised 30-day Event Rept 99-06 for Emergency Condition That Was Declared Alert at Portsmouth Gaseous Diffusion Plant ML20212G9401999-09-23023 September 1999 Responds to 990806 Reply to NOV in Ltr with Insp Rept 70-7002/99-04.Revised Reply Reviewed & Responses to Violations 1.B & 1.C Do Not Fully Address Needs as Clarified in 990715 Telcon.Resubmit Response within 30 Days of Ltr ML20212H3721999-09-22022 September 1999 Forwards NRC Form 790 Classification Record Documents for Paducah & Portsmouth GDPs That Were Generated During Month of Aug 1999.Without Encl ML20217J1211999-09-20020 September 1999 Submits Listed Comments on NRC Proposed Rule, Reporting Requirements for Nuclear Power Reactors ML20216E6911999-09-13013 September 1999 Forwards 30-day Written Rept Er 99-18,re Actuation of Cascade ADP Smokehead in X-333 Bldg Low Assay Withdrawal Station.Caused by UF6 Release from Law A/B Compressor Shaft Seal Area.Planned C/As Will Be Provided in Revised Rept ML20211Q7761999-09-10010 September 1999 Forwards Insp Rept 70-7002/99-205 on 990816-20.No Violations Noted.Insp Consisted of Selective Exams of Computer Systems, Representative Records & Interviews with Personnel ML20211P2091999-09-0909 September 1999 Provides Staff Written Clarification of NRC Reporting Expectations of When Double Contingency Losses Should Be Reported to NRC IAW Bulletin 91-001, Reporting Loss of Criticality Safety Controls, & Suppl ML20211Q8041999-09-0808 September 1999 Ack Receipt of Informing NRC of Steps Taken to Correct Violations Noted in Insp Rept 70-7002/99-05 ML20211Q7171999-09-0808 September 1999 Forwards Required 30-day Written Event Rept 99-14,rev 1,re 990628 Event Involving Actuation of Brake Sys on Liquid U Hexafluoride Handling Crane at Plant.Revised Rept Includes Corrective Actions.Commitments in Rept Also Encl ML20211N8951999-09-0707 September 1999 Forwards Required 30 Day Event Rept 99-17,for Event That Resulted from Determination That 13 Sprinkler Sys Associated with High Pressure Fire Water Sys in Process Buildings Were Not Capable of Meeting Operability Requirements ML20211P3831999-09-0303 September 1999 Forwards Coc GDP-1,amend 3 & Coc GDP-2,amend 4 for Paducah (Pgdp) & Portsmouth (Ports) Gdps,Respectively by Revising Pgdp & Ports QAPs in Vol 3 of Respective Certificate Applications ML20211M6401999-09-0303 September 1999 Forwards Security Incident Log for Month of Aug 1999,per Requirements of 10CFR95.57(b) ML20211M6941999-09-0202 September 1999 Forwards 30-day Written Event Rept 99-09,rev 1,for Event Involving Actuation of Brake Sys on Liquid U Hexafluoride Handling Crane at Plant.Revised Rept Includes Root Cause & Corrective Actions.List of Commitments,Included ML20211L4871999-09-0101 September 1999 Ack Receipt of Informing NRC of Steps Taken to Correct Violations Noted in Insp Rept 70-7002/99-07 Issued on 990709 ML20211K2081999-08-31031 August 1999 Discusses 990730 Revised Response to RAI Transmitted by NRC Re 990528 Response for Severity Level IV Violations Identified in Insp Rept 70-7002/99-06 ML20211K4041999-08-31031 August 1999 Forwards Responses to Remaining NRC Questions/Comments from 980601 & 0709 NRC RAIs Re SAR Update ML20211M7031999-08-30030 August 1999 Forwards Proprietary Rev 0 to Arming & Arrest Authority Security Plan for Paducah & Portsmouth Gaseous Diffusion Plants, for Review & Approval.Encl Withheld ML20211H2741999-08-27027 August 1999 Forwards Insp Rept 70-7002/99-09 on 990629-0809 & Notice of Violations Re Involving Inadequate Corrective Actions of Concern,Due to Staff Failure to Take Actions to Prevent Recent Derailment ML20211G9891999-08-26026 August 1999 Informs That on 990812,NRC Completed three-day Licensing Review of Activities Associated with Usec 990526,certificate Amend Request (CAR) to Reopen Compliance Plan Issues 8,9 & 23 at Portsmouth Plant ML20211D9311999-08-23023 August 1999 Forwards Required 30-day Written Event Rept 99-16 Re Event Involving Autoclave High Condensate Level Shutoff Actuation at Portsmouth Gaseous Diffusion Plant.List of Commitments, Included ML20211A7011999-08-17017 August 1999 Forwards Copy of Final Amend to 10CFR76 for Info of Subcommittee.Final Rule Is Being Transmitted to Fr for Publication.Final Rule Will Amend Regulations That Apply to Paducah & Portsmouth Gaseous Diffusion Plants ML20211C5951999-08-17017 August 1999 Submits Changes to Authorized Derivative Classifier List for Portsmouth Gdp.Changes Are Current as of 990806 ML20211D6341999-08-16016 August 1999 Forwards Proprietary Info Containing Process That Would Be Followed Once Deposit Identified That Could Cause Usec to Exceed NRC Possession Limit.Proprietary Encl Withheld ML20211D2351999-08-16016 August 1999 Replaces Ltr Forwarding Proprietary Followup to Submittal Re Holdup of U Enriched Greater than or Equal to 10 Weight Percent U-235 in Process Equipment ML20211D5771999-08-16016 August 1999 Submits Rev 1 to Event Rept 99-12,to Clarify That Only One of 50 Ball Lock Pins on Packages Used in Shipment Was Unfastened When Shipment Was Received.Cause Has Not Been Determined.Usec Revised Procedure XP4-TE-UH2400 ML20211C3941999-08-13013 August 1999 Forwards Proprietary Followup to Submittal Re Holdup of U Enriched Greater than or Equal to 10 Weight Percent U-235 in Process Equipment.Encls Withheld ML20211C8031999-08-13013 August 1999 Forwards Proprietary Versions of Rev 33 Changes to Fundamental Nuclear Matls Control Plan & Transportation Security Plan.Proprietary Encl Withheld ML20210P6981999-08-10010 August 1999 Forwards Insp Rept 70-7002/99-11 on 990719-23.No Violations Noted.Insp Consisted of Selective Exam of Procedures & Representative Records,Interviews with Personnel & Observations of Activities in Progress ML20210Q6061999-08-0909 August 1999 Forwards NRC Form 790 Classification Record Documents for Paducah & Portsmouth Gdps,Per 10CFR95.57.Records Were Generated During Month of July 1999.Without Encl ML20210Q5291999-08-0909 August 1999 Responds to Violations Noted in Insp Rept 70-7002/99-07. Corrective Actions:On 990622,results of NDA Surveys for G-17 Valves Moved Outside Bldg X-744H Were Obtained ML20210N8511999-08-0606 August 1999 Forwards Copy of Security Incident Log for Month of July 1999 ML20210P1841999-08-0606 August 1999 Revised Response to NRC NOV Re Violations Noted in Insp Rept 70-7002/99-04.Corrective actions:DOI-832-99-03 Revised & Reissued on 990729,to Include Any Document Utilized to Support Safety Basis in Ncse ML20211A7901999-08-0404 August 1999 Forwards Info Requested During Briefing by NRC Staff on 990726 Re NRC Interactions with Usec ML20211N2031999-08-0404 August 1999 Forwards Proprietary Versions of Rev 32 Changes to Fundamental Nuclear Matls Control Plan (FNMCP) & Transportation Security Plan.Proprietary Info Withheld,Per 10CFR2.790 & 9.17(a)(4) ML20210L1751999-08-0202 August 1999 Forwards Required 30-day Event Rept 99-15 Re Event That Resulted from Declaration of Alert Emergency Classification at Portsmouth Gaseous Diffusion Plant.Encl 2 Contains List of Commitments Made by Licensee ML20210U8511999-07-30030 July 1999 Forwards Quarterly Status Rept for Portsmouth Nuclear Criticality Safety Program Corrective Action Plan for Period 990421-0716.No New Commitments Are Contained in Submittal ML20210K0291999-07-30030 July 1999 Responds to NRC Expressing Concerns with 990528 Reply to NOVs Re Insp Rept 70-7002/99-006.Revised Response Encl 1999-09-09
[Table view] Category:INCOMING CORRESPONDENCE
MONTHYEARML20217N9141999-10-15015 October 1999 Forwards Rev 6 of NCS Cap,Providing Addl Details within Subtask 3.3,addl Ncsa/E Reviews & Establishes New Milestone to Conduct Addl Reviews IAW Procedure XP2=EG-NS1037, Review of Non-Priority 1 & 2 ML20217M2961999-10-15015 October 1999 Provides Addl Changes to Updated SAR Certificate Amend Request,Including Changes Made IAW Item 5 of Plan of Action Schedule for Compliance Plan Issue 2 & Changes That Resulted from Reevaluation of Autoclave head-to-shell O-ring ML20217B6121999-10-0606 October 1999 Forwards Copy of Security Incident Log for Month of Sept 1999 ML20217A4781999-10-0404 October 1999 Forwards Revised Event Rept 99-17,for Event Resulting from Determination That Sprinkler Sys Not Capable of Meeting Operability Requirements.Caused by Mineral Deposits.Provided Following Completion of Root Cause Evaluation ML20212H5991999-09-27027 September 1999 Responds to Violations Noted in Insp Rept 70-7002/99-09. Corrective Actions:Engineering Evaluated Site Rail Track Insp Process for Improvement ML20216J7891999-09-27027 September 1999 Provides Required 30-day Event Rept 99-19 for Event That Resulted from Failure of Cascade Automatic Data Processing Data Processing Smoke Detection Sys at Portsmouth Gaseous Diffusion Plant.Encl 2 Is List of Commitments Made in Rept ML20212H1251999-09-24024 September 1999 Notifies NRC of Change in Regulatory Commitments Associated with Submittal Date for Update of Application SAR Chapter 3.Specifics of Commitment Changes of Listed ML20212H3801999-09-24024 September 1999 Responds to 990723 RAI Re 1999 Annual Update to Certification Applications ML20212G0551999-09-23023 September 1999 Provides Revised 30-day Event Rept 99-06 for Emergency Condition That Was Declared Alert at Portsmouth Gaseous Diffusion Plant ML20212H3721999-09-22022 September 1999 Forwards NRC Form 790 Classification Record Documents for Paducah & Portsmouth GDPs That Were Generated During Month of Aug 1999.Without Encl ML20217J1211999-09-20020 September 1999 Submits Listed Comments on NRC Proposed Rule, Reporting Requirements for Nuclear Power Reactors ML20216E6911999-09-13013 September 1999 Forwards 30-day Written Rept Er 99-18,re Actuation of Cascade ADP Smokehead in X-333 Bldg Low Assay Withdrawal Station.Caused by UF6 Release from Law A/B Compressor Shaft Seal Area.Planned C/As Will Be Provided in Revised Rept ML20211Q7171999-09-0808 September 1999 Forwards Required 30-day Written Event Rept 99-14,rev 1,re 990628 Event Involving Actuation of Brake Sys on Liquid U Hexafluoride Handling Crane at Plant.Revised Rept Includes Corrective Actions.Commitments in Rept Also Encl ML20211N8951999-09-0707 September 1999 Forwards Required 30 Day Event Rept 99-17,for Event That Resulted from Determination That 13 Sprinkler Sys Associated with High Pressure Fire Water Sys in Process Buildings Were Not Capable of Meeting Operability Requirements ML20211M6401999-09-0303 September 1999 Forwards Security Incident Log for Month of Aug 1999,per Requirements of 10CFR95.57(b) ML20211M6941999-09-0202 September 1999 Forwards 30-day Written Event Rept 99-09,rev 1,for Event Involving Actuation of Brake Sys on Liquid U Hexafluoride Handling Crane at Plant.Revised Rept Includes Root Cause & Corrective Actions.List of Commitments,Included ML20211K4041999-08-31031 August 1999 Forwards Responses to Remaining NRC Questions/Comments from 980601 & 0709 NRC RAIs Re SAR Update ML20211D9311999-08-23023 August 1999 Forwards Required 30-day Written Event Rept 99-16 Re Event Involving Autoclave High Condensate Level Shutoff Actuation at Portsmouth Gaseous Diffusion Plant.List of Commitments, Included ML20211C5951999-08-17017 August 1999 Submits Changes to Authorized Derivative Classifier List for Portsmouth Gdp.Changes Are Current as of 990806 ML20211D5771999-08-16016 August 1999 Submits Rev 1 to Event Rept 99-12,to Clarify That Only One of 50 Ball Lock Pins on Packages Used in Shipment Was Unfastened When Shipment Was Received.Cause Has Not Been Determined.Usec Revised Procedure XP4-TE-UH2400 ML20211D2351999-08-16016 August 1999 Replaces Ltr Forwarding Proprietary Followup to Submittal Re Holdup of U Enriched Greater than or Equal to 10 Weight Percent U-235 in Process Equipment ML20211C3941999-08-13013 August 1999 Forwards Proprietary Followup to Submittal Re Holdup of U Enriched Greater than or Equal to 10 Weight Percent U-235 in Process Equipment.Encls Withheld ML20211C8031999-08-13013 August 1999 Forwards Proprietary Versions of Rev 33 Changes to Fundamental Nuclear Matls Control Plan & Transportation Security Plan.Proprietary Encl Withheld ML20210Q5291999-08-0909 August 1999 Responds to Violations Noted in Insp Rept 70-7002/99-07. Corrective Actions:On 990622,results of NDA Surveys for G-17 Valves Moved Outside Bldg X-744H Were Obtained ML20210Q6061999-08-0909 August 1999 Forwards NRC Form 790 Classification Record Documents for Paducah & Portsmouth Gdps,Per 10CFR95.57.Records Were Generated During Month of July 1999.Without Encl ML20210P1841999-08-0606 August 1999 Revised Response to NRC NOV Re Violations Noted in Insp Rept 70-7002/99-04.Corrective actions:DOI-832-99-03 Revised & Reissued on 990729,to Include Any Document Utilized to Support Safety Basis in Ncse ML20210N8511999-08-0606 August 1999 Forwards Copy of Security Incident Log for Month of July 1999 ML20211N2031999-08-0404 August 1999 Forwards Proprietary Versions of Rev 32 Changes to Fundamental Nuclear Matls Control Plan (FNMCP) & Transportation Security Plan.Proprietary Info Withheld,Per 10CFR2.790 & 9.17(a)(4) ML20210L1751999-08-0202 August 1999 Forwards Required 30-day Event Rept 99-15 Re Event That Resulted from Declaration of Alert Emergency Classification at Portsmouth Gaseous Diffusion Plant.Encl 2 Contains List of Commitments Made by Licensee ML20210K0291999-07-30030 July 1999 Responds to NRC Expressing Concerns with 990528 Reply to NOVs Re Insp Rept 70-7002/99-006.Revised Response Encl ML20210U8511999-07-30030 July 1999 Forwards Quarterly Status Rept for Portsmouth Nuclear Criticality Safety Program Corrective Action Plan for Period 990421-0716.No New Commitments Are Contained in Submittal ML20210G3391999-07-28028 July 1999 Forwards Required 30-day Event Rept 99-14 Re Actuation of Brake Sys on UF6 Handling Crane at Portsmouth Gaseous Diffusion Plant.Investigation Activities Continuing to Determine Appropriate Corrective Actions ML20210F2111999-07-27027 July 1999 Responds to NRC Re Violations Noted in Insp Rept 70-7002/99-06.Corrective Actions:Expectations for Activating EOC Were Reinforced & Lessons Learned Re Need to Activate EOC Was Issued ML20210J7921999-07-27027 July 1999 Forwards Proprietary NRC Form 327, Special Nuclear Matl (SNM) & Source Matl (SM) Physical Inventory Summary Rept, for Paducah & Portsmouth Gdps.Rept Covers Period Ending 990528.Proprietary Info Withheld,Per 10CFR2.790(d) ML20210H6001999-07-26026 July 1999 Forwards NRC Form 790 Classification Record Documents for Paducah & Portsmouth Gaseous Diffusion Plants That Were Generated During Month of June 1999.Without Encl ML20210H6151999-07-26026 July 1999 Submits Listed Changes to Adc List for Portsmouth Gaseous Diffusion Plant.Changes Current as of 990708 ML20216D7101999-07-23023 July 1999 Responds to Violations Noted in Insp Rept 70-7002/99-05. Corrective Actions:Portsmouth GDP Conducted site-wide Stand Down Re Adverse Trend in Human Performance ML20210J8641999-07-23023 July 1999 Forwards Info Detailing Basis for NCS CAP Schedule,As Requested at Conclusion of 990714 Meeting ML20210H2471999-07-22022 July 1999 Provides Addl Changes to Sarup Certificate Amend Request ,comprising Third Set of Sarup Technical Safety Requirements Changes,Changes to Sarup Section 3.8 & Sarup Chapter 14 Discussed in Usec to NRC ML20210B2061999-07-15015 July 1999 Forwards Original Standby Trust Agreement Ack Form.Facsimile of Ack Form Was Submitted in for Usec ML20210B9701999-07-15015 July 1999 Forwards Proprietary & non-proprietary Info Re Implementation Status of Compliance Plan.Info Covers Period of 990102-0630.Proprietary Info Withheld,Per 10CFR2.790 ML20209F7381999-07-12012 July 1999 Forwards Rev to 30-day Event Rept Er 98-17,re Event Which Resulted from Fire Causing Damage to Cascade Equipment Containing Radioactive Matl in X-326 Bldg Side Purge Area. Briefing Was Initiated for X-326 Operations Personnel ML20209D2171999-07-0202 July 1999 Requests Temporary Enforcement Discretion to Allow Continued Plant Operations While Completing Corrections to Criticality Accident Alarm Sys Cluster Setpoints to Be in Compliance with Technical Safety Requirements SRs ML20209D2561999-07-0101 July 1999 Forwards Security Incident Log & Associated Info for Period June 1999,per 10CFR95.57(b) ML20209B4541999-07-0101 July 1999 Responds to GL 98-03, NMSS Licensees & Certificate Holders Y2K Readiness Programs, Under Oath & Affirmation for Paducah & Portsmouth GDPs ML20209B8721999-06-30030 June 1999 Submits Listed Changes to Adc List for Portsmouth Gaseous Diffusion Plant,Which Are Current as of 990625 ML20209B9341999-06-28028 June 1999 Forwards Required 30 Day Event Rept 99-13 for 990528 Event Involving Liquid UF6 Handling Crane in X-330 Process Bldg Tails Withdrawal Area.Investigation Activities Continuing to Determine Root Cause & Corrective Actions for Event ML20209B4971999-06-25025 June 1999 Submits Event Rept Er 99-12 Re 980923 Shipment Received,From Licensee by Siemens Power Corp,With Ball Lock Pins Disengaged.Cause Undetermined.Licensee Revised Procedure XP4-TE-UH2400 to Improve Reliability ML20209D0721999-06-25025 June 1999 Informs That Licensee Intends to Maintain Compliance Plan Issue 2 in Open Status Until NRC Approves Update to Application SAR ML20196F0421999-06-21021 June 1999 Forwards Response to Violations Noted in Insp Rept 70-7002/99-04.Corrective Actions:On 990510,preliminary XP4-EG-NS1001,was Revised & Implemented to Include Definition of Unlikely Events & Provided Instructions 1999-09-08
[Table view] |
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USEC d A Global Energy Company September 2,1999 GDP 99-2046 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001 Portsmouth Gaseous Diffusion Plant (PORTS)
Docket No. 70-7002 Event Report 99-09, Revision 1 Pursuant to the Safety Analysis Report, Section 6.9, Table 6.9-1, J(2), Enclosure 1 provides the required 30-day written Event Report for an event involving an actuation of the brake system on a liquid uranium hexafluoride handling crane at the Portsmouth Gaseous Diffusion Plant. The revised event report includes the root cause and corrective actions. Enclosure 2 is a list of commitments contained in this report. Changes from the previous report are marked with a vertical dashed line in the right margin.
Should you require additional information regarding this event, please contact Scott Scholl at (740) 897-2373.
Sincerely,
. Morris Brown.
General Manager Portsmouth Gaseous Diffusion Plant W
Enclosures:
As Stated f
' cc:
NRC Region III Office NRC Resident Inspectors - PORTS 9909090179 990902 PDR ADOCK 07007002 C
PDR United States Enrichment Corporation Portsmouth Gaseous Diffusion Plant P.O. Ilox 628, Piketon, OH 45661 l
r-GDP 99-2046 Page 1 of 4 Event Report 99-09 Revision 1 Description of Event On May 4,1999, at approximately 1350 hours0.0156 days <br />0.375 hours <br />0.00223 weeks <br />5.13675e-4 months <br />, an operator was removing a 14 ton liquid uranium hexafluoride (UF.) tails cylinder f om X-343, autoclave (AC) #5, when the north crane brake actuated in response to a loss of power. The loss of power caused the cylinder to be suspended approximately one foot above AC #5 for approximately 45 minutes. Personnel investigating the loss of power determined that the hoist motor breaker had tripped. In accordance with plant procedures, the hoist breaker was reset and the cylinder was moved to the X-343 liquid uranium cool down area.
Prior to the event, the cylinder was being heated to perform required sampling. As a result of a false cylinder high temperature safety system actuation, the cylinder heating was stopped before the sampling could be performed. The cylinder was being removed from the autoclave at the time of the event to allow maintenance personnel to investigate the cause of the actuation.
The uncontrolled dropping of a liquid cylinder could result in the rupture of a cylinder and potential release of up to 28,000 pounds of UF.. As a result, liquid UF. handling overhead cranes are "Q" quality class items. The crane braking system is designed to prevent an uncontrolled drop upon loss of power. An actuation of the crane brake is reportable in accordance with the Safety Analysis Report (SAR), Table 6.9-1, J(2).
Cause of Event The direct cause for the actuation of the brakes on the north crane was power to the hoist motor was interrupted when the 40 amp hoist breaker tripped. The hoist breaker tripped as a result of high cunent being drawn by the hoist motor due to improper static stepless control system alignment.
The three cranes in X-343 are different than other liquid UF handling cranes because they utilize the P&ll static stepless hoist drive control system. This system is designed to control the speed / torque characteristics of 3-phase AC, wound-rotor induction motors. In this system, braking is provided by a mechanical brake. A Magnetorque load brake provides speed control.
l The root cause for the event was that the procedure for performing static stepless control system 1
alignments provided conflicting guidance and was written in a confusing format. Procedure l
XP4-TE-EM6450, "X-343 Crane Static Stepless Alignment" refers to the Ilarnischfeger P&ll l
2 Mainter.ance Manual, Static Stepless Control Bulletin 562/563, for the actual performance of the I
static stepless alignment. The manual provides step by step instructions on how to adjust settings l
to obtain the correct alignment. The last step of the instructions states that the alignment is complete l
at that point, but instructs personnel to observe crane operation with a load applied and make l
n GDP 99-2046 Page 2 of 4 Event Report 99-09 Revision 1 additional adjustments ifneeded. The additional adjustments, however, can invalidate the alignment.
l A note appears after the last step of the instructions that states certain adjustments will require the l
alignment to be re-performed. The normal procedure famiat used at PORTS would require the note l
to precede the action step. Since the note was located after the last step, maintenance personnel did l
not recognize that the note applied to the final adjustments they were making. The lack of l recognition of the information contained in the note was consistent among the various maintenance l
personnel who perfonn X-343 crane alignments. The troubleshooting section of the P & H manual l
is also confusing because it da., not provide step by step instructions on how to perform I
troubleshooting. All other crane maintenance procedures have been reviewed and do not require the l
use of a vendor manual in order to perform maintenance.
l A contributing cause for the event was a lack of acceptance criteria in procedure XP4-TE-EM6450.
l The procedure requires that as-found and as-left data on crane settings be recorded but does not l
specify the acceptance criteria for each parameter. The procedure indicates that acceptance criteria j
are found in Section 11 of the P & 11 maintenance manual, but this section of the manual does not l
include acceptance criteria for all parameters. In addition, the acceptance criteria that are included l
are not readily identifiable.
l Another contributing cause for the event was that the installed crane configuration did not match the l
vendor manual. The installed configuration consists of a 25 hp,1800 rpm motor with a Magnetorque l
105. The vendor drawing specifies that a Magnetorque 83 should be used with a 25 hp,1800 rpm l
motor. The static stepless alignment settings specified in the P & H Maintenance Manual are based l
on the configurations listed in the vendor manual and are not correct for the installed configuration.
l This resulted in the alignment being perfomied with incorrect settings and caused the Magnetorque l
to apply greater torque to the hoist motor resulting in increased motor current. The incorrect settings I
also resulted in the hoist motor surging while lifting a load. As a result, adjustments to the crane following performance of the static stepless alignment were required to correct the surging condition.
l As described above, maintenance personnel did not understand that the adjustments they were l
making to correct motor surging invalidated the static stepless alignment.
l The difference between the vendor manual and the installed configuration also caused the cathode l
transformer connections on the X-343 cranes to be wired on 120V taps instead of the required 240V l
taps. A 120V tap would be correct for a Magnetorque 83, but a Magnetorque 105 requires a 240V l
power supply. When this problem was discovered and corrected on the north crane, a review of the l
middle and south cranes was also conducted. The middle crane was also wired incorrectly, but has l
been out of service since approximately October 1987. The south crane was fbund to be wired l
l correctly. Further investigation revealed that incorrect wiring of the south crane had been previously l
discovered in 1996, and corrected at that time. A search of the problem report database indicated l
Fp.
i Enclosure i GDP 99-2046 Page 3 of 4 Event Report 99-09 Revision I that this problem was not reported and was not investigated to determine the cause. As a result, an l
opportunity to detect the crane configuration problem was missed. The investigation was not able l
to determine why this problem was not reported. Ilowever, the problem reporting system was l
relatively new at that time and problems were not as rigorously documented and investigated as they j
are now.
l j
i The crane purchase specificatioris originally required a 30 hp motor. The vendor drawings would l
have required that a Magnetorque 105 be matched to the 30 hp motor. These specifications would l
have matched vendor drawings and the correct settings would have been used. The motors were l
changed to 25 hp,1800 rpm motors before they were installed by an outside contractor around 1979, l
but the Magnetorque size was not changed. The reason for why the motors were changed could not I
be determined. Ilowever, the motor substitution occurred at a time when configuration controls were l
less rigorous than the controls that are in place today. Current configuration controls would require l
substitutions to be formally evaluated and documented.
l A possible contributing cause was the use of a type of grease that was not recommended by the l
vendor. The P & 11 Maintenance Manual specifies the type of grease that should be used in a l
Magnetorque 105, but this information was not incorporated into the applicable preventive I
maintenance procedure. The P & 11 Maintenance Manual indicates that use of the wrong grease in l
the Magnetorque has the potential to increase motor current.
l The investigation also determined that XP4-TE-EM6450 and the P & 11 Maintenance Manual does j
not require hoist motor amperage readings to be taken following alignment activities. Iloist motor i
amperage readings are useful because they can provide a method of verifying if static stepless l
alignments have been perfbrmed correctly. A post maintenance test has been developed to ensure l
the hoist motor amperage is checked prior to returning an X-343 crane to service following an l
alignment.
l Corrective Actions A.
Completed Corrective Actions l
1.
On May 15,1999, re-wiring of the north crane voltage taps was completed. The middle l
crane will remain out of service.
l 2
On June 3,1999, a new post maintenance test was developed to ensure the motor hoist l
amperage was checked prior to returning an X-343 crane to service following an alignment.
S
. 4 k
GDP 99-2046
~
Page 4 of 4 Event Report 99-09 Revision 1 3.
On August 3,1999, procedure XP4-TE-EM6450 was placed on hold to prohibit static l
stepless alignments from being performed until the procedure can be revised.
l 4.
On A.ugust 3,1999, the Magnetorque brake lubricant on the south crane was changed and l
replaced with the vendor recommended lubricant.
]
5.
On August 6,1999, the Magnetorque brake on the north crane was replaced with a new brake l
containing the vendor recommended iubricant.
l B.
Planned Corrective Actions l
6.
By October 15,1999, selected maintenance procedures will be reviewed to determine if l acceptance criteria are correctly listed in procedures. If the selected reviews determine that l
this event was not an isolated case, additional corrective actions will be initiated.
j 7.
By October 15, 1999, procedure XP4-TE-EM6451 " Preventive Maintenance of P & 11 l
Overhead Crane in X-343" will be revised to require that the vendor recommended lubricants l
be used in the Magnetorque brake assembly.
l 8.
By November 19,1999, procedure XP4-TE-EM6450 will be revised so that the procedure l
will be independent of the P & H Maintenance Manual and in the correct procedure format.
l The procedure revision will include: acceptance criteria for Magnetorque, reactor and hoist l
motor amperage values, crossover current will be changed so that it is 2 amps or less, and a l
step-by-step section for troubleshooting will be added.
l Extent of Exposure of Individuals to Radiation or Radioactive Materials There were no exposures to individuals from this incident to radiation or radioactive materials.
l l
Lessons Learned i
The lack of clear acceptance criteria allowed the crane configuration problems to go undetected. If l the appropriate acceptance criteria had been specified in the procedure, maintenance personnel would l
have discovered that the procedure could not be completed successfully with the specified settings.
l The crane configuration problems would likely have been detected and corrected earlier.
l
s.
GDP 99-2046 Page1of1 Event Report 99-09 Revision 1 List of Commitments 1.
By October 15,1999, selected maintenance procedures will be reviewed to determine if l acceptance criteria are correctly listed in procedures. If the selected reviews determine that i
this event was not an isolated case, additional corrective actions will be initiated.
l 2.
Ily October 15, 1999, procedure XP4-TE-EM6451 " Preventive Maintenance of P & 11 l
Overhead Crane in X-343" will be revised to require that the vendor recommended lubricants l
be used in the Magnetorque brake assembly.
l 3.
By November 19,1999, procedure XP4-TE-EM6450 will be revised so that the procedure l
will be independent of the P & 11 maintenance manual and in the correct procedure format.
l The procedure revision will include: acceptance criteria for Magnetorque, reactor and hoist l
motor amperage values, crossover current will be changed so that it is 2 amps or less, and a j
step-by-step section for troubleshooting will be added.
l
- Regulatory commitments contained in this document are listed here. Other actions listed in this submittal are not considered regulatory commitments in that they are either statements or actions completed, or they are considered enhancements to USEC's investigation, procedures, or operations.
i