Similar Documents at Zion |
---|
Category:CORRESPONDENCE-LETTERS
MONTHYEARML20217H4661999-10-18018 October 1999 Forwards Changes to EPIPs IAW 10CFR50.54(q) & 10CFR50,App E, Section V.Details of Changes Encl ML20217J4411999-10-18018 October 1999 Forwards Exemption from Certain Requirements of 10CFR73.55 for Zion Nuclear Power Station,Units 1 & 2 in Response to Application Dtd 990730,to Allow Util to Discontinue Specific Aspects of Security Plan & SER ML20216J8241999-09-30030 September 1999 Notifies of Removal of NRC Headquarters & Region III Offices from Controlled Copy Distribution of Certain CE Documents. Specific Documents,Associated Controlled Copy Numbers & NRC Location Affected Are Shown on Attachment to Ltr ML20216G9541999-09-27027 September 1999 Forwards Environ Assessment & Finding of No Significant Impact Re 990730 Application for Exemption.Exemption Would Allow Zion Nuclear Power Station to Discontinue Specific Aspects of Security Plan A99025, Forwards Response to NRC 990820 RAI Re Proposed Defueled TS for Zion Station1999-09-15015 September 1999 Forwards Response to NRC 990820 RAI Re Proposed Defueled TS for Zion Station ML20211L1551999-09-0101 September 1999 Forwards Insp Repts 50-295/99-03 & 50-304/99-03 on 990608-0812 at Zion 1 & 2 Reactor Facilities.No Violations Noted.Activities in Areas of Facility Mgt & Control, Decommissioning Support,Sf & Radiological Safety Examined ML20211J9701999-08-31031 August 1999 Discusses Request for Approval of Defueled Station Emergency Plan & Exemption from Certain Requirements of 10CFR50.47, Emergency Plans, for Plant,Units 1 & 2.Exemption & Safety Evaluation Encl ML20211J0311999-08-30030 August 1999 Agrees with Content in NRC 990810 Memo Re Plant Spent Fuel Pool.Memo Contains Accurate Summation of Info That Util Communicated to NRC During 990713 Telcon ML20211G1221999-08-27027 August 1999 Forwards fitness-for-duty Program Performance Data for Each of Comm Ed Nuclear Power Stations & Corporate Support Employees within Scope of Rule for six-month Period Ending 990630,IAW 10CFR26.71(d) ML20211G8191999-08-26026 August 1999 Forwards Amend 6 to Fire Protection Rept for Zion Nuclear Power Station,Units 1 & 2, IAW 10CFR50.71(e).Attachment 1 Contains Summary of Changes ML20211F5971999-08-20020 August 1999 Submits Request for Addl Info Re Proposed Defueled TSs for Plant,Per NRC Bulletin 94-001, Potential Fuel Pool Draindown Caused by Inadequate Maint Practices at Dresden Unit 1 ML20211C7401999-08-19019 August 1999 Informs That NRC Plans to Stop Using Office Complex at Zion Nuclear Generating Station Which Commonwealth Edison Provided for NRC Resident Inspectors Under 10CFR50.70(b)(1). NRC-owned Equipment to Be Moved on or About 991001 ML20211J4421999-08-13013 August 1999 Forwards, EA & Finding of No Significant Impact Re Application for Exemption ,as Suppl by 990708 & 19 Ltrs.Proposed Exemption Would Modify Emergency Response Plan Requirements as Listed ML20210N5651999-08-0606 August 1999 Forwards Rev 8 to Nuclear Generating Stations Emergency Plan, for Plants.With Summary of Changes ML20210M9131999-08-0202 August 1999 Forwards Response to NRC AL 99-02, Operating Reactor Licensing Action Estimates, for Fys 2000 & 2001 for Comed ML20210J0861999-07-30030 July 1999 Requests NRC Approval of Exemption from Certain Requirements of 10CFR73, Physical Protection of Plants & Matls, by 990921.Exemption Is Needed to Support Scheduled 991001 Implementation of Plant Sf Ni.Encl Withheld,Per 10CFR73.21 ML20210C3641999-07-20020 July 1999 Discusses OI Rept 3-98-017 Completed on 980224 Re Contract Security Officer That Inadvertently Brought Personal Handgun Into Search Area at Plant & Forward NOV ML20210C4201999-07-20020 July 1999 Discusses Investigation Rept 3-98-017 Into Info Reported to Comed on 980224,informing NRC That N Everson Brought Personal Handgun Into Personnel Search Area at Plant.Nrc Determined That Violation Occurred.Nov Encl ML20210C2561999-07-19019 July 1999 Forwards Rev 1 to Calculation 22S-B-110X-0068, Determination of Heat Load for Assemblies F50D & Z33A, as Replacement Pages to Rev 0.Calculation Submitted Re Request for Approval of Proposed Plant Defueled Station EP ML20210B7071999-07-16016 July 1999 Responds to Requesting Review & Approval of Three Proposed Changes to Ceco QA TR,CE-1A Per 10CFR50.54(a)(3) & 10CFR50.4(b)(7) ML20209E7391999-07-0808 July 1999 Forwards Proposed Revised Znps Defueled Station Emergency Plan & Supporting Calculations.Revs to Proposed Defueled Station Emergency Plan Have Been Reviewed & Approved IAW Comed QA Program ML20196J9131999-07-0101 July 1999 Submits Status of Nuclear Property Insurance Currently Maintained for Braidwood,Byron,Dresden,Lasalle County,Quad Cities & Zion Nuclear Power Stations,Per 10CFR50.54(w)(3) ML20196J9061999-07-0101 July 1999 Provides Evidence That Util Maintains Guarantee of Payment of Deferred Premiums in Amount of $10 Million for Each of Thirteen Reactors,Per 10CFR140.21 ML20209B8241999-06-30030 June 1999 Forwards Five 3.5 Inch Computer Diskettes Containing Revised Annual Dose Repts for 1994 Through 1998 for Individuals Receiving Neutron Dose Not Previously Included in Reported Total Effective Dose Equivalent Values.Without Diskettes ML20196D3301999-06-18018 June 1999 Forwards Insp Repts 50-295/99-02 & 50-304/99-02 on 990121-0608.No Violations or Deviations Were Identified. Weakness Noted in Self Assessment/Corrective Action Program in Which Series of Personnel Errors Not Recorded in PIF Sys ML20195H9391999-06-15015 June 1999 Forwards Revised Monthly Operating Rept for Apr 1999 for Zion Nuclear Power Station,Units 1 & 2.Data Was Revised to Reflect Change in Daylight Savings Time ML20207H6121999-06-10010 June 1999 Provides Synopsis of OI Rept 3-1998-012 & Summary of Relevant Facts Re Violation Involving Employment Discrimination Against SRO at Zion Station.Enforcement Conference Scheduled for 990707 ML20195E3451999-06-0707 June 1999 Forwards 3.5 Inch Computer Diskette Containing Revised File Format for Annual Dose Rept for 1998,per 990520 Telcon Request from Nrc.Each Station Data Is Preceded by Header Record,Which Provides Info Necessary to Identify Data ML20195D6351999-06-0404 June 1999 Notifies NRC of Actions That Has Been Taken in Accordance with 10CFR26, Fitness for Duty Programs A99018, Responds to NRC Re Violations Noted in IR 3-98- 017.Corrective Actions:Three Security Guards Unescorted Access to All Comm Ed Nuclear Stations Put on Temporary Hold1999-05-27027 May 1999 Responds to NRC Re Violations Noted in IR 3-98- 017.Corrective Actions:Three Security Guards Unescorted Access to All Comm Ed Nuclear Stations Put on Temporary Hold ML20195B2301999-05-19019 May 1999 Requests Approval of Proposed Changes to QA Topical Rept CE-1-A,rev 66a.Attachment a Describes Changes,Reason for Change & Basis for Concluding That Revised QAP Incorporating Proposed Changes Continues to Satisfy 10CFR50AppB ML20207B5991999-05-14014 May 1999 Informs That NRC Ofc of NRR Reorganized,Effective 990328.As Part of Reorganization,Div of Licensing Project Mgt Was Created.Reorganization Chart Encl ML20206F5381999-04-30030 April 1999 Forwards Magnetic Tape Containing Annual Dose Repts for 1998 for Braidwood,Byron,Dresden,Lasalle County,Quad Cities & Zion Nuclear Power Stations,Per 10CFR20.2206(c).Without Magnetic Tape ML20206D8041999-04-30030 April 1999 Forwards Zion Nuclear Power Station Annual Radiological Environ Operating Rept & Listing of Commitments ML20206B9371999-04-27027 April 1999 Discusses Investigation Rept 3-98-17 Re Info Reported by Licensee on 980224 That Firearm Detected During Routine Search of Contractor Employee & Failure to Rept Incident to Supervisor.Oi Rept Synopsis Encl ML20206B4051999-04-23023 April 1999 Ack Receipt of Encl FEMA Ltr,Transmitting FEMA Evaluation Rept for 980819 Annual Medical Drill for Zion Nuclear Power Station.No Deficiencies Noted.Two Areas Requiring Corrective Action Noted During Drill ML20206B2471999-04-20020 April 1999 Informs That SE Kuczynski Has Been Transferred to Position No Longer Requiring SRO License.Cancel License SOP-31030-1, Effective 990412 ML20205S5811999-04-16016 April 1999 Responds to Which Urged Full Public Hearing to Held on Concerns Raised by R Robarge & E Dienethal Re Zion Npp.Commission Issued 990302 Memo & Order Affirming ASLB Decision to Deny Petition to Intervene A99014, Provides Description of Actions Comed Has Taken to Reinforce Safety Conscious Work Environ at Zion Nuclear Power Station1999-04-15015 April 1999 Provides Description of Actions Comed Has Taken to Reinforce Safety Conscious Work Environ at Zion Nuclear Power Station ML20205Q9971999-04-13013 April 1999 Requests NRC Approval of Plant Defueled Station Emergency Plan in Accordance with 10CFR50.54(q).Ltrs of Agreement Between Util & Offsite Agencies Who Have Agreed to Provide Assistance to Plant Encl.Calculations Also Encl ML20205P2071999-04-0909 April 1999 Discusses Insp Repts 50-295/98-02,50-304/98-02 & OI Rept 3-98-015 Completed on 981112 & Forwards Nov.Violation Involves Zion Supervisor Who Willingly Failed to Protect Unattended SGI from Unauthorized Disclosure ML20205K5841999-03-31031 March 1999 Submits Rept on Status of Decommissioning Funding for Reactors Owned by Comm Ed.Attachment 1 Contains Amount of Decommissioning Funds Estimated to Be Required Pursuant to 10CFR50.75(b) & (C) ML20206B4331999-03-26026 March 1999 Forwards Rept for Annual Medical Drill Conducted for Zion Nuclear Power Station on 980819.Two Areas Requiring Corrective Action Identified During Drill ML20205B4241999-03-23023 March 1999 Provides Results of drive-in Drill Conducted on 990208,as Well as Augmentation Phone Drills Conducted Since 981015,as Committed to in Util A99011, Responds to NRC Re Violations Noted Insp Repts 50-295/98-02 & 50-304/98-02.Corrective Actions:Uncontrolled Safeguards Documents Were Immediately Taken Into Possession & Controlled by Plant Security Supervisor1999-03-18018 March 1999 Responds to NRC Re Violations Noted Insp Repts 50-295/98-02 & 50-304/98-02.Corrective Actions:Uncontrolled Safeguards Documents Were Immediately Taken Into Possession & Controlled by Plant Security Supervisor ML20207D6831999-03-0101 March 1999 Forwards fitness-for-duty Program Performance Data for Each Comed Nuclear Power Station & Corporate Support Employees for Six Month Period Ending 981231,per 10CFR26.71(d) A99009, Forwards Znps Annual Occupational Exposure Rept, for Exposures Occurring in 1998.Listing of Commitments Contained in Ltr Provided as Attachment B1999-03-0101 March 1999 Forwards Znps Annual Occupational Exposure Rept, for Exposures Occurring in 1998.Listing of Commitments Contained in Ltr Provided as Attachment B ML20202J4381999-02-0303 February 1999 Forwards Zion Fuel Evaluation Info,Per Discussion ML20203C7001999-02-0202 February 1999 Informs That Mhb Technical Associates No Longer Wishes to Receive Us Region III Docket Info Re Comed Nuclear Facilities.Please Remove Following Listing from Service List A99001, Forwards Zion 1998 Annual Rept of Revised Regulatory Commitments1999-01-19019 January 1999 Forwards Zion 1998 Annual Rept of Revised Regulatory Commitments 1999-09-30
[Table view] Category:INCOMING CORRESPONDENCE
MONTHYEARML20217H4661999-10-18018 October 1999 Forwards Changes to EPIPs IAW 10CFR50.54(q) & 10CFR50,App E, Section V.Details of Changes Encl ML20216J8241999-09-30030 September 1999 Notifies of Removal of NRC Headquarters & Region III Offices from Controlled Copy Distribution of Certain CE Documents. Specific Documents,Associated Controlled Copy Numbers & NRC Location Affected Are Shown on Attachment to Ltr A99025, Forwards Response to NRC 990820 RAI Re Proposed Defueled TS for Zion Station1999-09-15015 September 1999 Forwards Response to NRC 990820 RAI Re Proposed Defueled TS for Zion Station ML20211J0311999-08-30030 August 1999 Agrees with Content in NRC 990810 Memo Re Plant Spent Fuel Pool.Memo Contains Accurate Summation of Info That Util Communicated to NRC During 990713 Telcon ML20211G1221999-08-27027 August 1999 Forwards fitness-for-duty Program Performance Data for Each of Comm Ed Nuclear Power Stations & Corporate Support Employees within Scope of Rule for six-month Period Ending 990630,IAW 10CFR26.71(d) ML20211G8191999-08-26026 August 1999 Forwards Amend 6 to Fire Protection Rept for Zion Nuclear Power Station,Units 1 & 2, IAW 10CFR50.71(e).Attachment 1 Contains Summary of Changes ML20210N5651999-08-0606 August 1999 Forwards Rev 8 to Nuclear Generating Stations Emergency Plan, for Plants.With Summary of Changes ML20210M9131999-08-0202 August 1999 Forwards Response to NRC AL 99-02, Operating Reactor Licensing Action Estimates, for Fys 2000 & 2001 for Comed ML20210J0861999-07-30030 July 1999 Requests NRC Approval of Exemption from Certain Requirements of 10CFR73, Physical Protection of Plants & Matls, by 990921.Exemption Is Needed to Support Scheduled 991001 Implementation of Plant Sf Ni.Encl Withheld,Per 10CFR73.21 ML20210C2561999-07-19019 July 1999 Forwards Rev 1 to Calculation 22S-B-110X-0068, Determination of Heat Load for Assemblies F50D & Z33A, as Replacement Pages to Rev 0.Calculation Submitted Re Request for Approval of Proposed Plant Defueled Station EP ML20209E7391999-07-0808 July 1999 Forwards Proposed Revised Znps Defueled Station Emergency Plan & Supporting Calculations.Revs to Proposed Defueled Station Emergency Plan Have Been Reviewed & Approved IAW Comed QA Program ML20196J9061999-07-0101 July 1999 Provides Evidence That Util Maintains Guarantee of Payment of Deferred Premiums in Amount of $10 Million for Each of Thirteen Reactors,Per 10CFR140.21 ML20196J9131999-07-0101 July 1999 Submits Status of Nuclear Property Insurance Currently Maintained for Braidwood,Byron,Dresden,Lasalle County,Quad Cities & Zion Nuclear Power Stations,Per 10CFR50.54(w)(3) ML20209B8241999-06-30030 June 1999 Forwards Five 3.5 Inch Computer Diskettes Containing Revised Annual Dose Repts for 1994 Through 1998 for Individuals Receiving Neutron Dose Not Previously Included in Reported Total Effective Dose Equivalent Values.Without Diskettes ML20195H9391999-06-15015 June 1999 Forwards Revised Monthly Operating Rept for Apr 1999 for Zion Nuclear Power Station,Units 1 & 2.Data Was Revised to Reflect Change in Daylight Savings Time ML20195E3451999-06-0707 June 1999 Forwards 3.5 Inch Computer Diskette Containing Revised File Format for Annual Dose Rept for 1998,per 990520 Telcon Request from Nrc.Each Station Data Is Preceded by Header Record,Which Provides Info Necessary to Identify Data ML20195D6351999-06-0404 June 1999 Notifies NRC of Actions That Has Been Taken in Accordance with 10CFR26, Fitness for Duty Programs A99018, Responds to NRC Re Violations Noted in IR 3-98- 017.Corrective Actions:Three Security Guards Unescorted Access to All Comm Ed Nuclear Stations Put on Temporary Hold1999-05-27027 May 1999 Responds to NRC Re Violations Noted in IR 3-98- 017.Corrective Actions:Three Security Guards Unescorted Access to All Comm Ed Nuclear Stations Put on Temporary Hold ML20195B2301999-05-19019 May 1999 Requests Approval of Proposed Changes to QA Topical Rept CE-1-A,rev 66a.Attachment a Describes Changes,Reason for Change & Basis for Concluding That Revised QAP Incorporating Proposed Changes Continues to Satisfy 10CFR50AppB ML20206D8041999-04-30030 April 1999 Forwards Zion Nuclear Power Station Annual Radiological Environ Operating Rept & Listing of Commitments ML20206F5381999-04-30030 April 1999 Forwards Magnetic Tape Containing Annual Dose Repts for 1998 for Braidwood,Byron,Dresden,Lasalle County,Quad Cities & Zion Nuclear Power Stations,Per 10CFR20.2206(c).Without Magnetic Tape ML20206B2471999-04-20020 April 1999 Informs That SE Kuczynski Has Been Transferred to Position No Longer Requiring SRO License.Cancel License SOP-31030-1, Effective 990412 A99014, Provides Description of Actions Comed Has Taken to Reinforce Safety Conscious Work Environ at Zion Nuclear Power Station1999-04-15015 April 1999 Provides Description of Actions Comed Has Taken to Reinforce Safety Conscious Work Environ at Zion Nuclear Power Station ML20205Q9971999-04-13013 April 1999 Requests NRC Approval of Plant Defueled Station Emergency Plan in Accordance with 10CFR50.54(q).Ltrs of Agreement Between Util & Offsite Agencies Who Have Agreed to Provide Assistance to Plant Encl.Calculations Also Encl ML20205K5841999-03-31031 March 1999 Submits Rept on Status of Decommissioning Funding for Reactors Owned by Comm Ed.Attachment 1 Contains Amount of Decommissioning Funds Estimated to Be Required Pursuant to 10CFR50.75(b) & (C) ML20206B4331999-03-26026 March 1999 Forwards Rept for Annual Medical Drill Conducted for Zion Nuclear Power Station on 980819.Two Areas Requiring Corrective Action Identified During Drill ML20205B4241999-03-23023 March 1999 Provides Results of drive-in Drill Conducted on 990208,as Well as Augmentation Phone Drills Conducted Since 981015,as Committed to in Util A99011, Responds to NRC Re Violations Noted Insp Repts 50-295/98-02 & 50-304/98-02.Corrective Actions:Uncontrolled Safeguards Documents Were Immediately Taken Into Possession & Controlled by Plant Security Supervisor1999-03-18018 March 1999 Responds to NRC Re Violations Noted Insp Repts 50-295/98-02 & 50-304/98-02.Corrective Actions:Uncontrolled Safeguards Documents Were Immediately Taken Into Possession & Controlled by Plant Security Supervisor A99009, Forwards Znps Annual Occupational Exposure Rept, for Exposures Occurring in 1998.Listing of Commitments Contained in Ltr Provided as Attachment B1999-03-0101 March 1999 Forwards Znps Annual Occupational Exposure Rept, for Exposures Occurring in 1998.Listing of Commitments Contained in Ltr Provided as Attachment B ML20207D6831999-03-0101 March 1999 Forwards fitness-for-duty Program Performance Data for Each Comed Nuclear Power Station & Corporate Support Employees for Six Month Period Ending 981231,per 10CFR26.71(d) ML20202J4381999-02-0303 February 1999 Forwards Zion Fuel Evaluation Info,Per Discussion ML20203C7001999-02-0202 February 1999 Informs That Mhb Technical Associates No Longer Wishes to Receive Us Region III Docket Info Re Comed Nuclear Facilities.Please Remove Following Listing from Service List A99001, Forwards Zion 1998 Annual Rept of Revised Regulatory Commitments1999-01-19019 January 1999 Forwards Zion 1998 Annual Rept of Revised Regulatory Commitments A98056, Forwards List of Revised Various Commitments Originally Contained in Util to Nrc.Changes in Commitments Were Satisfactorily Evaluated Using NEI Commitment Change Methodology1998-12-11011 December 1998 Forwards List of Revised Various Commitments Originally Contained in Util to Nrc.Changes in Commitments Were Satisfactorily Evaluated Using NEI Commitment Change Methodology ML20198C2501998-12-11011 December 1998 Forwards Rev 45 to Zion Nuclear Power Station Security Plan, Per Requirements of 10CFR50.4(b)(4).Rev Includes Listed Changes.Licensee Has Concluded That Changes Do Not Decrease Safeguards Effectiveness of Plan.Encl Withheld ML20196B5871998-11-20020 November 1998 Requests That Svc List for All NRC Correspondence Re Any of Six Comed Nuclear Stations Be Modified Per Attached List.All Other Names Previously Listed Should Be Removed A98051, Forwards List of Revised Regulatory Commitments Which Were Evaluated as Satisfactory Using NEI Commitment Change Methodology1998-11-20020 November 1998 Forwards List of Revised Regulatory Commitments Which Were Evaluated as Satisfactory Using NEI Commitment Change Methodology A98055, Forwards List of Revised Regulatory Commitments Which Were Evaluated as Satisfactory Using NEC Commitment Change Methodology1998-11-20020 November 1998 Forwards List of Revised Regulatory Commitments Which Were Evaluated as Satisfactory Using NEC Commitment Change Methodology ML20195E6451998-11-12012 November 1998 Provides Results of drive-in Drill Conducted on 981007,as Well as Augmentation Phone Drill Conducted on 980917 A98059, Forwards Page Change Instruction for Aug 1998 DSAR for Zion Nuclear Power Station,Units 1 & 2.Instruction Was Omitted from 981110 DSAR Due to Administrative Error1998-11-11011 November 1998 Forwards Page Change Instruction for Aug 1998 DSAR for Zion Nuclear Power Station,Units 1 & 2.Instruction Was Omitted from 981110 DSAR Due to Administrative Error A98053, Forwards Change Instructions for Update to Zion UFSAR, Rewritten to Reflect Permanent Defueled Condition of Plant. & DSAR,1998-11-10010 November 1998 Forwards Change Instructions for Update to Zion UFSAR, Rewritten to Reflect Permanent Defueled Condition of Plant. & DSAR, ML20155D2701998-10-27027 October 1998 Forwards Changed Pages from 980423 Submittal Providing Addl Info Marked with Revision Bars & Revised Pages to QA Topical Rept Section 18,for Review ML20198C7401998-10-21021 October 1998 Informs That Encl Correspondence Was Received from Constituent,C Paxton Re Request for Investigation as to Documentation Also Encl.Without Encl ML20154J4951998-10-0707 October 1998 Forwards Revised Security Plans for CE Listed Nuclear Power Stations,Per 10CFR50.4(b)(4).Changes Do Not Decrease Effectiveness of Station Security Plans.Encl Withheld A98050, Forwards Zion Station Special Rept Number 30412398002SR.Rept for Reporting Period of Jan 1996-Dec 1997.Attachment B Provides Listing of Commitments Contained in Submittal1998-10-0505 October 1998 Forwards Zion Station Special Rept Number 30412398002SR.Rept for Reporting Period of Jan 1996-Dec 1997.Attachment B Provides Listing of Commitments Contained in Submittal ML20151Y5101998-09-11011 September 1998 Provides Results of drive-in-drill Conducted on 980804 & Augmentation Phone Drills Conducted Between 980601 & 0831 ML20238F7571998-08-28028 August 1998 Forwards fitness-for-duty Program Performance Data for Each of Util Nuclear Power Stations for Six Month Period Ending 980630 A98047, Forwards Revised Scope of One Commitment Contained in Response to NOV1998-08-28028 August 1998 Forwards Revised Scope of One Commitment Contained in Response to NOV ML20153F6811998-08-26026 August 1998 Informs of E Dienethal & R Robarge Concerns Re Safety of Areas in & Around City of Zion ML20237D9281998-08-24024 August 1998 Provides Description of Approach Being Taken by Comed to Develop Dsar.New Safety Classification Will Be Developed for Equipment Determined to Be Important to Defueled Condition 1999-09-30
[Table view] |
Text
., Commonweahh Illien Company I400 Opus Place Downers Grove, II. G)515-570 I January 30,1997 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attn: Document Control Desk
Subject:
Additional Information Pertaining to Zion Unit 2 Steam Generator Inspection Zion Nuclear Power Station Unit 2 NRC Docket Number: 50-304
Reference:
Commonwealth Edison Company / Nuclear Regulatory Commission Meeting dated November 15,1996 At the November l$th meeting, the Commonwealth Edison Company (Comed) and t .e Nuclear Regulatory Commission (NRC) discussed the Zion Unit 2 steam generators inspection results. During that meeting the preliminary results of the structural assessment of Tube R01C72, Steam Generator 3 were discussed. Subsequent to that meeting, the finalized calculation was completed which confirmed the preliminary results that the burst pressure would be in excess of the difTerential pressure load associated with a margin of three against burst during normal operating conditions. As you requested this finalized i evaluation which has been reviewed and approved by Comed is provided in Attachment A. Also, provided in Attachment B is the summary of the Zion 2 U-bend history along with Comed's conclusion that the history reflects expected primary water stress corrosion cracking (PWSCC) with imFored Plus -
Point Probe sensitivity.
If you have any questions concerning this correspondence, please contact Denise Saccomando, Senior PWR Licensing Administrator at (630) 663-7283.
Sincerely, ahw John B. Hosmer Engineering Vice President i
Attachments l
cc: C. Shiraki, Zion Project Manager-NRR A. Vegel, Senior Resident inspector-Zion A. B. Beach, Regional Administrator-Rill Office of Nuclear Safety-IDNS I
(h '
ho D 4 K:nla\ zion \ubend A I!nicom Company I
Attachment A
" Evaluation of Steam Generator 3, R01C72 U-Bend Indication" l
l I
i K:nla\ zion \ubend
l i
NSD-RFK-96-040, Rev. I
- From
- Steam Generator Design & Analysis WIN: 224 - 5086 Date: January 27,1997
Subject:
Evaluation of Zion 2, SG 3, RIC72 U-Bend Indication 4 To: J. Pierce ec: T. Pitterle J. Houtman j G. Whiteman W. Cullen D. Malinowski J. Bingaman R Sdth Note: Revision 1 corrects two typographical errors contained in the original release. In Section 2 "or rectangular" was corrected to "of rectangular,"
and " Alloy 600 steam" was changed to " Alloy 600 and 690 steam."
The attached evaluation was performed in response to a request from Mike Sears and Keith Moser, both of Commonwealth Edison, to estimate the structural integri-ty of the subject tube. The conclusion of the evaluation is that the burst pressure would be expected to be in excess of the differential pressure load associated with a i margin to 3 against burst during normal operation conditions and 1.43 during postulated accident conditions, as indicated by the guidelines in draft Regulatory ;
Guide 1.121. Please transmit the evaluation information to John Blomgren of Commonwealth Edison at Downer's Grove, and to Keith Moser at the Zion station.
If you have any questions regarding this letter, please address them to me at the above WIN number.
Sincerely,
&_ o&
Robert F. Keating, Advisory ngineer SG Design & Analysis
[
Zion 2, SG 3, R01C72 Indication Evaluation of a U-Bend Indication in
, Tube R01C72, SG 3, at Zion Unit 2 1.0 Introduction During the most recent inspection of the steam generator (SG) tubes at the Zion 2 nuclear power plant, axially oriented indications were reponed for which demonstration of tube integrity !
i relative to the guidelines of draft Regulatory Guide (RG) 1.121 was deemed appropriate. One of the tubes, SG 3, RIC13, was in situ pressure tested to 5000 psi at ambient temperature, Reference 0. The normal operating (NOp) differential pressure, AP, during the last operating cycle was 1530 psi at temperature. Thus, the test pressure was 3.3 times the NOp AP.
Accounting for the reduction in the Dow stress of the tube material with temperatum, 8.8% per Reference 0, the test pressure was at an equivalent margin of 3.0 relative to normal operation.
The indication in the second tube developed a leak and testing was terminated at a pressure cormsponding to main steam line break (SLB) conditions. Since a pressure of 5000 psi could not be achieved by the test equipment, a structural analysis of the tube based on the eddy
.~urrent inspection reponed profile of the indication was requested by Commonwealth Edison.
2.0 Evaluation The basis for the analysis of the burst pressure was the burst correlation information presented in Reference 0 for throughwall axial cracks in straight tubing. Since the indication is not everywhere throughwall, the correlation result is adjusted to account for the strength of the ligament material. In essence, the indication or crack is analyzed as being of rectangular profile with a linear interpolation being made between the nondegraded and throughwall burst pressures i using the ratio of the indication depth to the thickness of the tube. For depths greater than l about 75 %, the interpolation is nonlinear to account for the fact that thin ligaments have a j smaller critical crack tip opening displacement (CTOD) than thick ligaments. The analysis is programmed in a Excel
- spreadsheet and actually calculates the burst pressure for every possible sub-crack of the main crack. The lowest burst pressure calculated is the value assumed for the tube _being analyzed. The cenified mill test repon propenies for the RIC72 tube, Reference 0, were used for the analysis.
The analysis summary sheet is attached. The indication profile as a function of length was adjusted to account for the look-ahead and look-behind characteristics,'i.e., end effects (EE), of the eddy current test (ECT) analysis signals. This is most apparent in the figure on the attachment where the depth given by the dashed line appears to increase at the right end of the indication. Using the actual material propenies, the estimated burst pressure for the indication D:\P!ANTsiCOM96\UBEND-AX.WP5 01/31/97 1
Zion 2, SG 3, R01C72 Indication 4 :
- , is 4145 psi at normal operating conditions if the indication existed in the straight length of the tubing. References 0 and 0, present the results of burst tests conducted on fabricated straight-leg and U-bend indications in Alloy 600 and 690 steam generator tubes with nominal diameters
! of 7/8" and 3/4" and wall thicknesses of 0.050" and 0.043" respectively. The test msults
] demonstrate that a 39% increase in the burst resistance of a 1/2" long throughwall indication
- located on the extrados of a 7/8" diameter tube which has been bent into the U-bend shape for a row 1 tube. Hence, the expected burst pressure for the indication in service would be about
- 5720 psi. This is a factor of 3.74 times the NOp AP or about 125% of the margin of 3
- specified in RG 1.121 for normal operating conditions. This would be expected to be quite i sufficient to accommodate any potential ECT uncertainties. Moreover, an analysis of the
! profile with end effects led to a burst pressure prediction of almost 4800 psi or about 3.13 times j the NOp AP.
! It is noted that the guideline for margin during postulated accident conditions leads to a critical l applied pressure of 3657 psi. Since this is less than 4590 psi, 3AP, the normal operation j guideline govems. In addition, prior tests have demonstrated that the burst pressure of tubes
{ with axial cracks is not significantly affected by bending loads such as could be developed during earthquake conditions or by flow during other conditions.
3.0 Conclusions The burst pressure of the indication at normal opemting conditions is estimated to be greater than 5700 psi, or 3.74 times the normal operating pressure differential. This is about 1100 psi greater than, or 125 % of, the draft RG guideline regarding a margin of three relative to burst during normal opemtion. In summary, the guidelines of RG 1.121 were met at the end of the current cycle of operation with sufficient margin to accomodate significant ECT error.
I The average of three tests on extrados throughwall indications with the range of factors being 1.37 to 1.42.
DnPLANT5\COM96\UBEND-AX.WP5 01/31/97 2 l
Zion 2, SG 3, R01C72 Indication 4.0 References
- 1. Personal communication with M. Sears (Commonwealth Edison) on November 7,1996.
- 2. .WCAP-12522, "Inconel Alloy 600 Tubing - Material Burst and Strength Propenies,"
Westinghouse Electric Corporation (January,1990). 1
- 3. SG-95-03-010 (EPRI Licensable), " Burst Pressure Correlation for Steam Generator Tubes with Throughwall Axial Cracks," R. Keating, et al., Westinghouse Electric Corporation (February,1995).
- 4. Personal communication with K. Moser (Commonwealth Edison) on November 12,1996.
- 5. MT-SGMCE-144, " Burst Tests of Small Diameter U-Bends," A. Klein to C. Hirst, ;
Westinghouse Electric Corporation (June 16, 1982).
- 6. STD-7.2.4-7180, "PWS 4.802 Final Repon," B. Gowda to E. McDonough, Westinghouse Electric Colporation (December 21,1987). :
i l
l D:\PIANT3\COM96\UBEND-AX.WP5 01/31/97 3
Attichmtnt to NSD-RFK-96-040
- Zion Unit 2 - U-Bend Crack, SG 3, R01C72 - 1996 01/27/97 i I l OD t Rm Sf.LTL Sf. Nom Sf RT20P Sf. cert-RT Sf. cert-OT I O.875 0 050 0.4125 63.12 68.78 91.1 % 78.50 71.54 Pbar2Pb P0 P pn P.sec dP.nop dP. sib 3 dP.nop 1.4 dP. stb 15.301 9.147 2.250 0.720 1.530 2.560 4.590 3.657 l 1 I l
MRPC, Final Adjusted, Final I Axial Crack Extrados Crack Extrados Weak Link Function Using )
Location Depths Lengths Depths Lengths BKH2 Model l 9.41 0% 0.000 0% X. min 0.000 9.44 39 % 0.036 0% X. max 0.594 l 9.47 75 % 0.071 0% Length 0.594 9.50 88 % 0.107 88 % 0.000 Depth 93.6 %
9.53 96 % 0.143 96 % 0.036 Pb/Sf 0.058 9.56 97% 0.178 97 % 0.071 Pb. Nom 3.985 9.59 98 % 0.214 98 % 0.107 Pb.LTL 3.657 9.62 97% 0.250 97 % 0.143 Pb. Cert 4.145 9.65 98% 0.285 98 % 0.178 Ph.Thru 4.013 9.68 97 % 0.321 97 % 0.214 U-Bend location: Extrados 9.71 97 % 0.357 97 % 0.250 U-Bend strength factor 1.38 I 9.74 98% 0.392 98 % 0.285 l Pb. nom 5.500 )
9.77 99 % 0.428 99% 0.321 1 Pb.LTL 5.047 i 9.80 98% 0.464 98 % 0.357 l Pb. cert 5.721 9.83 98% 0.499 98 % 0.392 Pb. cert / dP.nop 3.74 1 9.86 99 % 0.535 99 % 0.428 iEstimated burst pressure j 9.89 99 % 0.571 99 % 0.464 ifor U-bend axial i 9.91 97 % 0.594 97 % 0.487 indication.
l 9.94 92 % 0.630 92 % 0.523 Extrados Length Adj 9.97 87 % 0.666 87 % 0.559 OD 0.8750 10.00 85% 0.701 0% 0.594 t 0.0500 10.03 90 % 0.737 0% Rm 0.4125 10.06 92 % 0.773 0% R. min 2.1875 ,
10.09 0% 0.808 0% Ex. Factor 118 9% j D. avg 87.5 % D. avg 93.6 % Heat 1733 j L 0.808 L 0.594 _. Sy 55 j Pb.600 3.299 Pb.600 4.145 Su 102 I Ratio Psib 1.3 Ratio Psib 1.6 _
Sf 78.5 l l Zion Unit 2 - U-Bend Crack; SG 3i R01C72 - 1996 l 100%
w__o --o---o o-w ~--w i 90 %
/ Ni **
7 N. . .-
80 % ,l
.I xu 70 %
1
!I I I ! ',
h 60% - j ,
{
z w% i ,
\ '.
m
Q yy . I i \
l -o-MRPC w/o EE ' I 20% ,I i k MRPC Raw Data I
10%
f )
l 0% d-o-- d w-o-- E I 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 l Length from End of Crack (in.)
4 RFK 1I31/97.915 AM
(-ME2o2F XLS} R01C72
t t
i l
Attachment B Zion 2 U-Bend Information l
1 l
)
l l
l l
l l
l
)
i j
i K:nla\ zion \ubend
r Zion 2 E-Bend Indications Row I U-Bend Indications 3/84 2 - 9/85. I Bobbin Coil Inspections 6/87 3 - 11/88 2 Bobbin CoilInspections 1/89 6 -4/90 28 U-Bend MRPC Inspections 12/92 36 - 2/95 35 U-Bend MRPC Inspections 9/96 64 + Point RPC Inspections Prior to To Fall 1996
- MRPC:
100% Row 1Each SG 25 Tubes Row 2 Each SG Fall 1996 Inspection (Z2R14)
- Plus Point 100% Row I & 2 Each SG
- 64 Tubes Plugged Due to U-Bend Indications 3 Indications Identifiable In Spring 1995 Data Review
- All Remaining Row 1 Tubes Preventatively Plugged All Zion Unit 1 Row 1 Tubes Were Preventatively Plugged in 1982
Conclusion:
Expected PWSCC Degradation With Improved Plus Point Sensitivity
_ _ _ _ _ - _ - _ . - - _ _ _ - _ _ . - - _ _ _ _ - _ _ _ _ _ _ _ _ - _ - _ _ _ - _ - _