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Category:CORRESPONDENCE-LETTERS
MONTHYEARNOC-AE-000675, Forwards Clarification on Items Included in 990531 Response to RAI Re Proposed License Amend Associated with Operator Action for Sbloca,As Requested1999-10-21021 October 1999 Forwards Clarification on Items Included in 990531 Response to RAI Re Proposed License Amend Associated with Operator Action for Sbloca,As Requested NOC-AE-000680, Forwards Rev 5 to 0PGP03-ZV-0001, Severe Weather Plan1999-10-20020 October 1999 Forwards Rev 5 to 0PGP03-ZV-0001, Severe Weather Plan NOC-AE-000683, Forwards 30-day Rept Concerning Significant Changes to Accepted Large Break Loss of Coolant Accident ECCS Evaluation Model for South Tx Project,Units 1 & 2,IAW 10CFR50.46(a)(3)(ii)1999-10-19019 October 1999 Forwards 30-day Rept Concerning Significant Changes to Accepted Large Break Loss of Coolant Accident ECCS Evaluation Model for South Tx Project,Units 1 & 2,IAW 10CFR50.46(a)(3)(ii) ML20217K9341999-10-15015 October 1999 Forwards SER Accepting Util 990609 Relief Request RR-ENG-2-4 for Relief from ASME Code,Section XI, Nondestructive Exam Requirements Applicable to Stp,Units 1 & 2,reactor Vessel Closure Head Nuts ML20217K9091999-10-15015 October 1999 Forwards SER Accepting Util 990609 Relief Request RR-ENG-2-3 from ASME Code,Section Xi,Nondestructive Exam Requirements Applicable to South Texas Project,Units 1 & 2, Pressurizer Support Attachment Welds 05000498/LER-1999-008, Forwards LER 99-008-00 Re Turbine Trip That Occurred While Performing Main Turbine Emergency Trip Test.Commitments Made by Licensee Are Listed in Corrective Actions Section of LER1999-10-12012 October 1999 Forwards LER 99-008-00 Re Turbine Trip That Occurred While Performing Main Turbine Emergency Trip Test.Commitments Made by Licensee Are Listed in Corrective Actions Section of LER NOC-AE-000674, Forwards Requested Estimates of Needs for Operator Licensing Exams,Per AL-99-03, Operator Licensing National Exam Schedule1999-10-12012 October 1999 Forwards Requested Estimates of Needs for Operator Licensing Exams,Per AL-99-03, Operator Licensing National Exam Schedule NOC-AE-000625, Requests Partial Relief from ASME Section XI Visual Exam Requirements of IWA-5242(a).Relief Request Is Based on Provisions of Draft ASME Section XI Code Case N-616,which Is Expected to Be Published in Near Future1999-10-0707 October 1999 Requests Partial Relief from ASME Section XI Visual Exam Requirements of IWA-5242(a).Relief Request Is Based on Provisions of Draft ASME Section XI Code Case N-616,which Is Expected to Be Published in Near Future NOC-AE-000610, Requests Relief from ASME Section XI Code Nondestructive Exam Requirements of IWA-5250(a)(2) for Second Inservice Insp Interval,Per Provisions of 10CFR50.55a(3)(i)1999-10-0707 October 1999 Requests Relief from ASME Section XI Code Nondestructive Exam Requirements of IWA-5250(a)(2) for Second Inservice Insp Interval,Per Provisions of 10CFR50.55a(3)(i) NOC-AE-000653, Requests Relief from ASME Section XI Code Requirements of Table IWE-2500-1 for VT-3 Visual Exam of Seals & Gaskets on Airlocks,Hatches & Other Devices Required to Assure Containment leak-tight Integrity,Per 10CFR50.55a(a)(3)(i)1999-10-0707 October 1999 Requests Relief from ASME Section XI Code Requirements of Table IWE-2500-1 for VT-3 Visual Exam of Seals & Gaskets on Airlocks,Hatches & Other Devices Required to Assure Containment leak-tight Integrity,Per 10CFR50.55a(a)(3)(i) ML20217C3221999-10-0707 October 1999 Forwards Insp Repts 50-498/99-16 & 50-499/99-16 on 990808-0918.No Violations Noted.Insp Generally Characterized by safety-conscious Operations,Sound Engineering & Maint Practices & Careful Radiological Work Controls 05000499/LER-1999-006, Forwards LER 99-006-00,re Entry Into TS 3.0.3.Licensee Commitments Listed in Corrective Actions Section of Attachment1999-09-30030 September 1999 Forwards LER 99-006-00,re Entry Into TS 3.0.3.Licensee Commitments Listed in Corrective Actions Section of Attachment ML20212L1651999-09-30030 September 1999 Responds to STP Nuclear Operating Co 981012 & s Which Provided Update to TS Bases Pages B 3/4 8-14 Through B 3/4 8-17.NRC Staff Found Change Consistent with TS 3/4.8.2 DC Sources. Staff Found & Deleted Typographical Error NOC-AE-000664, Forwards Rev 1 to STP Electric Generating Station Unit 1 Cycle 9 COLR & Rev 1 to STP Electric Generating Station Unit 2 Cycle 7 Colr1999-09-30030 September 1999 Forwards Rev 1 to STP Electric Generating Station Unit 1 Cycle 9 COLR & Rev 1 to STP Electric Generating Station Unit 2 Cycle 7 Colr ML20212J7141999-09-29029 September 1999 Forwards Insp Repts 50-498/99-15 & 50-499/99-15 on 990920-24 at South Texas Project Electric Generating Station.No Violations Noted.Insp Covered Requalification Training Program & Observation of Requalification Activities NOC-AE-000646, Informs NRC That STP Nuclear Operating Co Is Y2K Ready IAW Nei/Nusmg 97-07 Guidelines & Also Provides Response to NRC Ltr1999-09-28028 September 1999 Informs NRC That STP Nuclear Operating Co Is Y2K Ready IAW Nei/Nusmg 97-07 Guidelines & Also Provides Response to NRC Ltr ML20212J0651999-09-27027 September 1999 Discusses Licensee 980330 Response to GL 97-06, Degradation of SG Internals. Concludes That Response to GL Provides Reasonable Assurance That Condition of SG Internals in Compliance with Current Licensing Bases for Facility ML20212F1791999-09-24024 September 1999 Discusses 990923 Meeting Conducted in Region IV Ofc Re Status of Activities to Support Confirmatory Order, ,modifying OL & to Introduce New Director,Safety Quality Concerns Program.List of Attendees Encl ML20212E9091999-09-23023 September 1999 Discusses GL 98-01, Year 2000 Readiness of Computer Sys at Npps, Supplement 1 & STP Nuclear Operating Co Response for STP Dtd 990629.Understands That at Least One Sys or Component Listed May Have Potential to Cause Transient ML20212F2111999-09-22022 September 1999 Forwards Review of SG 90-day Rept, South Texas Unit-2 Cycle 7 Voltage-Based Repair Criteria Rept, Submitted by Util on 990119 NOC-AE-000633, Forwards Rev 3 to SG-99-04-005, STP 1RE08 Outage Condition Monitoring Rept & Final Operational Assessment. Rept Satisfies Reporting Requirements of NEI 97-06,dtd Dec 19971999-09-21021 September 1999 Forwards Rev 3 to SG-99-04-005, STP 1RE08 Outage Condition Monitoring Rept & Final Operational Assessment. Rept Satisfies Reporting Requirements of NEI 97-06,dtd Dec 1997 NOC-AE-000634, Forwards Addl Info Re GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Povs. MOV design-basis Review Checklist,Encl1999-09-21021 September 1999 Forwards Addl Info Re GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Povs. MOV design-basis Review Checklist,Encl NOC-AE-000649, Forwards Current Annual Financial Data for STP Electric Generating Station Per 10CFR50.71(b),acting on Behalf of Central Power & Light Co,City of Austin,Tx,City Public Svc Board of San Antonio & Hl&P1999-09-21021 September 1999 Forwards Current Annual Financial Data for STP Electric Generating Station Per 10CFR50.71(b),acting on Behalf of Central Power & Light Co,City of Austin,Tx,City Public Svc Board of San Antonio & Hl&P 05000499/LER-1999-005, Forwards LER 99-005-00,re Esfa Following Loss of Power to Standby Transformer 2 Due to Electrical Fault.Licensee Commitments Are Listed in Corrective Actions Section of LER1999-09-20020 September 1999 Forwards LER 99-005-00,re Esfa Following Loss of Power to Standby Transformer 2 Due to Electrical Fault.Licensee Commitments Are Listed in Corrective Actions Section of LER ML20212D9171999-09-16016 September 1999 Informs That on 990818,NRC Completed Midcycle PPR of South Texas Project & Identified No Areas in Which Performance Warranted Insp Beyond Core Insp Program.Details of Insp Plan Through Mar 2000 & Historical Listing of Plant Issues,Encl ML20216F5471999-09-15015 September 1999 Discusses 990914 Meeting Conducted at Region Iv.Meeting Was Requested by Staff to Introduce New Management Organization to Region IV & to Discuss General Plant Performance & Mgt Challenges IR 05000498/19990121999-09-14014 September 1999 Forwards Insp Repts 50-498/99-12 & 50-499/99-12 on 990816-19.Three Violations Occurred & Being Treated as Ncvs. Areas Examined During Insp Included Portions of Access Authorization & Physical Security Programs 05000498/LER-1999-007, Forwards LER 99-007-00 Re Train 'B' CR Makeup & Cleanup Filtration Sys Being Inoperable for Greater than Aot.Util Intends to Append Addl Info Section of LER with Brief Description of Test Results,Rather than Submit Separate LER1999-09-13013 September 1999 Forwards LER 99-007-00 Re Train 'B' CR Makeup & Cleanup Filtration Sys Being Inoperable for Greater than Aot.Util Intends to Append Addl Info Section of LER with Brief Description of Test Results,Rather than Submit Separate LER ML20211P8201999-09-0909 September 1999 Forwards SE Authorizing 990224 Submittal of First 10-year Interval ISI Program Plan - Relief Request RR-ENG-24,from ASME Section XI Code,Table IWC-2500-1 NOC-AE-000638, Forwards License Renewal Applications & Certifications of Medical Exam for Seven Listed Licensed Operators at Stp,Per 10CFR55.57.Encl Withheld,Per 10CFR2.790(a)(6)1999-09-0909 September 1999 Forwards License Renewal Applications & Certifications of Medical Exam for Seven Listed Licensed Operators at Stp,Per 10CFR55.57.Encl Withheld,Per 10CFR2.790(a)(6) ML20211P7671999-09-0909 September 1999 Forwards SER Authorizing Licensee 990517 Alternative Proposed in Relief Request RR-ENG-2-8 to Code Case N-491-2 for Second 10-year Insp Interval of South Texas Project, Units 1 & 2,pursuant to 10CFR50.55a(a)(3)(i) ML20211P7871999-09-0909 September 1999 Forwards Safety Evaluation Re First 10-yr Interval Inservice Insp Program Plan Request for Relief RR-ENG-31 IR 05000498/19990141999-09-0303 September 1999 Forwards Insp Repts 50-498/99-14 & 50-499/99-14 on 990627-0807.Apparent Violations Identified & Being Treated as Noncited Violations Consistent with App C of Enforcement Policy NOC-AE-000562, Requests Relief from Contruction Code non-destructive Exam Requirements for Repair/Replacement Activities During Second Inservice Insp Interval of Units 1 & 2,IAW Provisions of 10CFR50.55a(a)(3)(i)1999-08-31031 August 1999 Requests Relief from Contruction Code non-destructive Exam Requirements for Repair/Replacement Activities During Second Inservice Insp Interval of Units 1 & 2,IAW Provisions of 10CFR50.55a(a)(3)(i) ML20212A4351999-08-27027 August 1999 Discusses Investigation Rept OI-4-1999-009 Re Activites at South Texas Project.Oi Investigation Initiated in Response to Alleged Employment Discrimination Complaint. Allegation Not Substantiated.No Further Action Planned NOC-AE-000617, Forwards semi-annual Fitness for Duty Program Performance Rept for 990101-990630,IAW 10CFR26.71(d)1999-08-26026 August 1999 Forwards semi-annual Fitness for Duty Program Performance Rept for 990101-990630,IAW 10CFR26.71(d) ML20211J2511999-08-26026 August 1999 Discusses Proposed TS Change on Replacement SG Water Level Trip Setpoint for Plant,Units 1 & 2 NOC-AE-000585, Provides Notification That South Texas Project Has Completed Integrity Evaluation of Units 1 & 2 Reactor Coolant Pump Casings Required by Paragraph (D) of Code Case N-4811999-08-25025 August 1999 Provides Notification That South Texas Project Has Completed Integrity Evaluation of Units 1 & 2 Reactor Coolant Pump Casings Required by Paragraph (D) of Code Case N-481 ML20211F4421999-08-24024 August 1999 Forwards SE Authorizing Licensee 990513 Request for Relief RR-ENG-2-13,seeking Relief from ASME B&PV Code Section Xi,Exam Vessel shell-to-flange Welds for Second ISI Intervals ML20211F5031999-08-23023 August 1999 Forwards SE Authorizing Licensee 990315 Request for Relief RR-ENG-30,seeking Relief from ASME B&PV Code,Section Xi,Nde Requirements Applicable to Stp,Unit 2 SG Welds ML20212A4391999-08-17017 August 1999 Discusses Investigation Rept OI-4-1999-023 Re Activities at South Texas Project.Oi Investigation Initiated in Response to Alleged Employment Discrimination for Initiating Condition Report to Document Unauthorized Work Practices ML20210U1271999-08-16016 August 1999 Forwards Insp Repts 50-498/99-08 & 50-499/99-08 on 990517-21 & 0607-10.No Violations Noted.Corrective Action Program Was Reviewed ML20211A9501999-08-12012 August 1999 Discusses 990720-21 Workshop Conducted in Region IV Ofc,Re Exchange of Info in Area of Use of Risk Insights in Regulatory Activities.List of Attendees,Summary of Topic & Issues,Agenda & Copies of Handouts Encl ML20211B7881999-08-10010 August 1999 Transmits Summary of Two Meetings with Risk-Informed TS Task Force in Rockville,Md on 990514 & 0714 ML20210L1461999-08-0303 August 1999 Informs That NRC Plans to Administer Gfes of Written Operator Licensing Exam on 991006.Requests Submittal of Ltr Identifying Individuals Taking Exam,Personnel Allowed Access to Exams & Mailing Address for Exams NOC-AE-000603, Informs of Addition of Restriction to SRO License 42658, for KM Espinoza,Effective 990721,per 10CFR50.74.Encl Info Withheld,Per 10CFR2.790(a)(6)1999-07-29029 July 1999 Informs of Addition of Restriction to SRO License 42658, for KM Espinoza,Effective 990721,per 10CFR50.74.Encl Info Withheld,Per 10CFR2.790(a)(6) NOC-AE-000470, Forwards Amend 12 to STP Fire Hazards Analysis Rept. Summary of Changes Made Under Provision of 10CFR50.59 Also Encl1999-07-28028 July 1999 Forwards Amend 12 to STP Fire Hazards Analysis Rept. Summary of Changes Made Under Provision of 10CFR50.59 Also Encl NOC-AE-000599, Forwards STP Unit 1,Cycle 9 Startup Testing Summary Rept. No New Licensing Commitments Contained in Ltr1999-07-28028 July 1999 Forwards STP Unit 1,Cycle 9 Startup Testing Summary Rept. No New Licensing Commitments Contained in Ltr NOC-AE-000589, Forwards Rev to 1RE08 ISI Summary Repts for Repairs & Replacements & for Sys Pressure Tests,Corecting Date of End of Insp Interval Provided in Item 9 of from NIS-1 from 09/24/99 to 09/24/20001999-07-26026 July 1999 Forwards Rev to 1RE08 ISI Summary Repts for Repairs & Replacements & for Sys Pressure Tests,Corecting Date of End of Insp Interval Provided in Item 9 of from NIS-1 from 09/24/99 to 09/24/2000 ML20210F3851999-07-26026 July 1999 Forwards Exam Repts 50-498/99-301 & 50-499/99-301 on 990706- 15.Exam Included Evaluation of 9 Applicants for SO Licenses & 8 Applicants for RO Licenses 1999-09-09
[Table view] Category:INCOMING CORRESPONDENCE
MONTHYEARNOC-AE-000675, Forwards Clarification on Items Included in 990531 Response to RAI Re Proposed License Amend Associated with Operator Action for Sbloca,As Requested1999-10-21021 October 1999 Forwards Clarification on Items Included in 990531 Response to RAI Re Proposed License Amend Associated with Operator Action for Sbloca,As Requested NOC-AE-000680, Forwards Rev 5 to 0PGP03-ZV-0001, Severe Weather Plan1999-10-20020 October 1999 Forwards Rev 5 to 0PGP03-ZV-0001, Severe Weather Plan NOC-AE-000683, Forwards 30-day Rept Concerning Significant Changes to Accepted Large Break Loss of Coolant Accident ECCS Evaluation Model for South Tx Project,Units 1 & 2,IAW 10CFR50.46(a)(3)(ii)1999-10-19019 October 1999 Forwards 30-day Rept Concerning Significant Changes to Accepted Large Break Loss of Coolant Accident ECCS Evaluation Model for South Tx Project,Units 1 & 2,IAW 10CFR50.46(a)(3)(ii) NOC-AE-000674, Forwards Requested Estimates of Needs for Operator Licensing Exams,Per AL-99-03, Operator Licensing National Exam Schedule1999-10-12012 October 1999 Forwards Requested Estimates of Needs for Operator Licensing Exams,Per AL-99-03, Operator Licensing National Exam Schedule 05000498/LER-1999-008, Forwards LER 99-008-00 Re Turbine Trip That Occurred While Performing Main Turbine Emergency Trip Test.Commitments Made by Licensee Are Listed in Corrective Actions Section of LER1999-10-12012 October 1999 Forwards LER 99-008-00 Re Turbine Trip That Occurred While Performing Main Turbine Emergency Trip Test.Commitments Made by Licensee Are Listed in Corrective Actions Section of LER NOC-AE-000625, Requests Partial Relief from ASME Section XI Visual Exam Requirements of IWA-5242(a).Relief Request Is Based on Provisions of Draft ASME Section XI Code Case N-616,which Is Expected to Be Published in Near Future1999-10-0707 October 1999 Requests Partial Relief from ASME Section XI Visual Exam Requirements of IWA-5242(a).Relief Request Is Based on Provisions of Draft ASME Section XI Code Case N-616,which Is Expected to Be Published in Near Future NOC-AE-000610, Requests Relief from ASME Section XI Code Nondestructive Exam Requirements of IWA-5250(a)(2) for Second Inservice Insp Interval,Per Provisions of 10CFR50.55a(3)(i)1999-10-0707 October 1999 Requests Relief from ASME Section XI Code Nondestructive Exam Requirements of IWA-5250(a)(2) for Second Inservice Insp Interval,Per Provisions of 10CFR50.55a(3)(i) NOC-AE-000653, Requests Relief from ASME Section XI Code Requirements of Table IWE-2500-1 for VT-3 Visual Exam of Seals & Gaskets on Airlocks,Hatches & Other Devices Required to Assure Containment leak-tight Integrity,Per 10CFR50.55a(a)(3)(i)1999-10-0707 October 1999 Requests Relief from ASME Section XI Code Requirements of Table IWE-2500-1 for VT-3 Visual Exam of Seals & Gaskets on Airlocks,Hatches & Other Devices Required to Assure Containment leak-tight Integrity,Per 10CFR50.55a(a)(3)(i) 05000499/LER-1999-006, Forwards LER 99-006-00,re Entry Into TS 3.0.3.Licensee Commitments Listed in Corrective Actions Section of Attachment1999-09-30030 September 1999 Forwards LER 99-006-00,re Entry Into TS 3.0.3.Licensee Commitments Listed in Corrective Actions Section of Attachment NOC-AE-000664, Forwards Rev 1 to STP Electric Generating Station Unit 1 Cycle 9 COLR & Rev 1 to STP Electric Generating Station Unit 2 Cycle 7 Colr1999-09-30030 September 1999 Forwards Rev 1 to STP Electric Generating Station Unit 1 Cycle 9 COLR & Rev 1 to STP Electric Generating Station Unit 2 Cycle 7 Colr NOC-AE-000646, Informs NRC That STP Nuclear Operating Co Is Y2K Ready IAW Nei/Nusmg 97-07 Guidelines & Also Provides Response to NRC Ltr1999-09-28028 September 1999 Informs NRC That STP Nuclear Operating Co Is Y2K Ready IAW Nei/Nusmg 97-07 Guidelines & Also Provides Response to NRC Ltr NOC-AE-000633, Forwards Rev 3 to SG-99-04-005, STP 1RE08 Outage Condition Monitoring Rept & Final Operational Assessment. Rept Satisfies Reporting Requirements of NEI 97-06,dtd Dec 19971999-09-21021 September 1999 Forwards Rev 3 to SG-99-04-005, STP 1RE08 Outage Condition Monitoring Rept & Final Operational Assessment. Rept Satisfies Reporting Requirements of NEI 97-06,dtd Dec 1997 NOC-AE-000634, Forwards Addl Info Re GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Povs. MOV design-basis Review Checklist,Encl1999-09-21021 September 1999 Forwards Addl Info Re GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Povs. MOV design-basis Review Checklist,Encl NOC-AE-000649, Forwards Current Annual Financial Data for STP Electric Generating Station Per 10CFR50.71(b),acting on Behalf of Central Power & Light Co,City of Austin,Tx,City Public Svc Board of San Antonio & Hl&P1999-09-21021 September 1999 Forwards Current Annual Financial Data for STP Electric Generating Station Per 10CFR50.71(b),acting on Behalf of Central Power & Light Co,City of Austin,Tx,City Public Svc Board of San Antonio & Hl&P 05000499/LER-1999-005, Forwards LER 99-005-00,re Esfa Following Loss of Power to Standby Transformer 2 Due to Electrical Fault.Licensee Commitments Are Listed in Corrective Actions Section of LER1999-09-20020 September 1999 Forwards LER 99-005-00,re Esfa Following Loss of Power to Standby Transformer 2 Due to Electrical Fault.Licensee Commitments Are Listed in Corrective Actions Section of LER 05000498/LER-1999-007, Forwards LER 99-007-00 Re Train 'B' CR Makeup & Cleanup Filtration Sys Being Inoperable for Greater than Aot.Util Intends to Append Addl Info Section of LER with Brief Description of Test Results,Rather than Submit Separate LER1999-09-13013 September 1999 Forwards LER 99-007-00 Re Train 'B' CR Makeup & Cleanup Filtration Sys Being Inoperable for Greater than Aot.Util Intends to Append Addl Info Section of LER with Brief Description of Test Results,Rather than Submit Separate LER NOC-AE-000638, Forwards License Renewal Applications & Certifications of Medical Exam for Seven Listed Licensed Operators at Stp,Per 10CFR55.57.Encl Withheld,Per 10CFR2.790(a)(6)1999-09-0909 September 1999 Forwards License Renewal Applications & Certifications of Medical Exam for Seven Listed Licensed Operators at Stp,Per 10CFR55.57.Encl Withheld,Per 10CFR2.790(a)(6) NOC-AE-000562, Requests Relief from Contruction Code non-destructive Exam Requirements for Repair/Replacement Activities During Second Inservice Insp Interval of Units 1 & 2,IAW Provisions of 10CFR50.55a(a)(3)(i)1999-08-31031 August 1999 Requests Relief from Contruction Code non-destructive Exam Requirements for Repair/Replacement Activities During Second Inservice Insp Interval of Units 1 & 2,IAW Provisions of 10CFR50.55a(a)(3)(i) NOC-AE-000617, Forwards semi-annual Fitness for Duty Program Performance Rept for 990101-990630,IAW 10CFR26.71(d)1999-08-26026 August 1999 Forwards semi-annual Fitness for Duty Program Performance Rept for 990101-990630,IAW 10CFR26.71(d) NOC-AE-000585, Provides Notification That South Texas Project Has Completed Integrity Evaluation of Units 1 & 2 Reactor Coolant Pump Casings Required by Paragraph (D) of Code Case N-4811999-08-25025 August 1999 Provides Notification That South Texas Project Has Completed Integrity Evaluation of Units 1 & 2 Reactor Coolant Pump Casings Required by Paragraph (D) of Code Case N-481 NOC-AE-000603, Informs of Addition of Restriction to SRO License 42658, for KM Espinoza,Effective 990721,per 10CFR50.74.Encl Info Withheld,Per 10CFR2.790(a)(6)1999-07-29029 July 1999 Informs of Addition of Restriction to SRO License 42658, for KM Espinoza,Effective 990721,per 10CFR50.74.Encl Info Withheld,Per 10CFR2.790(a)(6) NOC-AE-000599, Forwards STP Unit 1,Cycle 9 Startup Testing Summary Rept. No New Licensing Commitments Contained in Ltr1999-07-28028 July 1999 Forwards STP Unit 1,Cycle 9 Startup Testing Summary Rept. No New Licensing Commitments Contained in Ltr NOC-AE-000470, Forwards Amend 12 to STP Fire Hazards Analysis Rept. Summary of Changes Made Under Provision of 10CFR50.59 Also Encl1999-07-28028 July 1999 Forwards Amend 12 to STP Fire Hazards Analysis Rept. Summary of Changes Made Under Provision of 10CFR50.59 Also Encl 05000498/LER-1999-006, Forwards LER 99-006-00 Re Automatic Reactor Trip Due to over-temp delta-temp Actuation.Licensee Commitments Are Listed in Corrective Actions Section of LER1999-07-26026 July 1999 Forwards LER 99-006-00 Re Automatic Reactor Trip Due to over-temp delta-temp Actuation.Licensee Commitments Are Listed in Corrective Actions Section of LER NOC-AE-000589, Forwards Rev to 1RE08 ISI Summary Repts for Repairs & Replacements & for Sys Pressure Tests,Corecting Date of End of Insp Interval Provided in Item 9 of from NIS-1 from 09/24/99 to 09/24/20001999-07-26026 July 1999 Forwards Rev to 1RE08 ISI Summary Repts for Repairs & Replacements & for Sys Pressure Tests,Corecting Date of End of Insp Interval Provided in Item 9 of from NIS-1 from 09/24/99 to 09/24/2000 NOC-AE-000582, Forwards 1RE08 ISI Summary Rept for Welds & Component Supports of STP Electric Generating Station,Unit 1. Summary Rept Satisfies Reporting Requirements of IWA-6000 of Section XI for Welds & Component Supports1999-07-26026 July 1999 Forwards 1RE08 ISI Summary Rept for Welds & Component Supports of STP Electric Generating Station,Unit 1. Summary Rept Satisfies Reporting Requirements of IWA-6000 of Section XI for Welds & Component Supports NOC-AE-000597, Forwards voltage-based Criteria 90-day Rept for SG Tube Exam Performed Under NRC GL 95-05 During Refueling Outage 1RE08. Rept Contains Info Required by Section 6.b of Attachment 2 to GL 95-051999-07-23023 July 1999 Forwards voltage-based Criteria 90-day Rept for SG Tube Exam Performed Under NRC GL 95-05 During Refueling Outage 1RE08. Rept Contains Info Required by Section 6.b of Attachment 2 to GL 95-05 NOC-AE-000598, Forwards Four Copies of 1RE08 Refueling Outage ISI Summary Rept for Steam Generator Tubing1999-07-23023 July 1999 Forwards Four Copies of 1RE08 Refueling Outage ISI Summary Rept for Steam Generator Tubing NOC-AE-00586, Forwards Results of Control Rod Testing,In Response to NRC Bulletin 96-01, Control Rod Insertion Problems, Dtd 960308.Core Map Provided to Assist in Understanding Test Data1999-07-21021 July 1999 Forwards Results of Control Rod Testing,In Response to NRC Bulletin 96-01, Control Rod Insertion Problems, Dtd 960308.Core Map Provided to Assist in Understanding Test Data NOC-AE-000595, Forwards Chapters 1.0 & 16.0 to Operations QA Plan for South Texas Project.Rev Is Strictly Administrative & All Content Was Previously Submitted to NRC on 990503 & 9906151999-07-21021 July 1999 Forwards Chapters 1.0 & 16.0 to Operations QA Plan for South Texas Project.Rev Is Strictly Administrative & All Content Was Previously Submitted to NRC on 990503 & 990615 NOC-AE-000518, Requests Exemption from Various Special Treatment Requirements of 10CFR50,as Described in Encls to Ltr.Stp Believes That Pilot Application Will Assist NRC in Development & Implementation of risk-informed 10CFR501999-07-13013 July 1999 Requests Exemption from Various Special Treatment Requirements of 10CFR50,as Described in Encls to Ltr.Stp Believes That Pilot Application Will Assist NRC in Development & Implementation of risk-informed 10CFR50 NOC-AE-000536, Submits Request for Exemption from Requirements of 10CFR50.34(b)(11),10CFR50,App A,Gdc 2 & 10CFR100,App a, Section VI(a)(3) Re Maint of Seismic Instrumentation.Revised Page to Procedure OERP01-ZV-IN01 Included1999-07-13013 July 1999 Submits Request for Exemption from Requirements of 10CFR50.34(b)(11),10CFR50,App A,Gdc 2 & 10CFR100,App a, Section VI(a)(3) Re Maint of Seismic Instrumentation.Revised Page to Procedure OERP01-ZV-IN01 Included NOC-AE-000580, Forwards Response to NRC 990415 RAI Re Implementation of Commitments Related to GL 89-10, Safety-Related MOV Testing & Surveillance & GL 96-05, Periodic Verification of Design Basis Capability of Safety-Related Movs1999-07-13013 July 1999 Forwards Response to NRC 990415 RAI Re Implementation of Commitments Related to GL 89-10, Safety-Related MOV Testing & Surveillance & GL 96-05, Periodic Verification of Design Basis Capability of Safety-Related Movs NOC-AE-000574, Forwards ISI Summary Repts for Repairs & Replacements & for Sys Pressure Tests Performed Between 971004 & Completion of Eighth RO on 9904281999-07-0606 July 1999 Forwards ISI Summary Repts for Repairs & Replacements & for Sys Pressure Tests Performed Between 971004 & Completion of Eighth RO on 990428 NOC-AE-000557, Requests Relief from ASME Section XI Code Nondestructive Exam Requirements of App III,III-3410 for Second ISI Interval.Proposed Alternatives for Ultrasonic Exam of Piping Sys Welds,Attached1999-07-0606 July 1999 Requests Relief from ASME Section XI Code Nondestructive Exam Requirements of App III,III-3410 for Second ISI Interval.Proposed Alternatives for Ultrasonic Exam of Piping Sys Welds,Attached NOC-AE-000498, Requests Relief from ASME Section XI Code Nondestructive Exam Requirements Applicable to SG Main Steam Nozzle inside- Radius Sections.Attachment Includes Discussion of Basis & Justification for Request & Implementation Schedule1999-07-0606 July 1999 Requests Relief from ASME Section XI Code Nondestructive Exam Requirements Applicable to SG Main Steam Nozzle inside- Radius Sections.Attachment Includes Discussion of Basis & Justification for Request & Implementation Schedule NOC-AE-000573, Requests Relief from Requirements of ASME Section XI Code Case N-498,exempting Isolated Class 1 Reactor Vessel Head Vent Atmospheric Vent Piping & Valve from Being Tested at Full RCS Pressure1999-07-0606 July 1999 Requests Relief from Requirements of ASME Section XI Code Case N-498,exempting Isolated Class 1 Reactor Vessel Head Vent Atmospheric Vent Piping & Valve from Being Tested at Full RCS Pressure NOC-AE-000541, Submits Response to GL 98-01,Suppl 1, Y2K Readiness of Computer Systems at Npps. Readiness Disclosure for STP, Encl1999-06-29029 June 1999 Submits Response to GL 98-01,Suppl 1, Y2K Readiness of Computer Systems at Npps. Readiness Disclosure for STP, Encl NOC-AE-000571, Forwards Final Operating Exam Matls for STP Exam Scheduled for 990705.Revised Operating Exam Outline & post-validation Change Summary Has Been Included.Without Encls1999-06-24024 June 1999 Forwards Final Operating Exam Matls for STP Exam Scheduled for 990705.Revised Operating Exam Outline & post-validation Change Summary Has Been Included.Without Encls NOC-AE-000512, Responds to NRC 981201 Telcon Re Jco 93-0004,per Revised MSLB Analysis1999-06-23023 June 1999 Responds to NRC 981201 Telcon Re Jco 93-0004,per Revised MSLB Analysis NOC-AE-000560, Forwards LER 99-S02-00,re Failure to Maintain Positive Control of Vital Area Security Key.Licensee Commitments Are Found in Corrective Action Section of LER1999-06-23023 June 1999 Forwards LER 99-S02-00,re Failure to Maintain Positive Control of Vital Area Security Key.Licensee Commitments Are Found in Corrective Action Section of LER 05000498/LER-1999-005, Forwards LER 99-005-00,re Failure to Meet Requirements of TS Surveillance 3.7.1.2 Action B for Auxiliary FW Sys.Only Commitments Contained in Ltr Are Located in Corrective Action Section of LER1999-06-17017 June 1999 Forwards LER 99-005-00,re Failure to Meet Requirements of TS Surveillance 3.7.1.2 Action B for Auxiliary FW Sys.Only Commitments Contained in Ltr Are Located in Corrective Action Section of LER NOC-AE-000565, Forwards Amended Pages for Insertion Into South Texas Project Nuclear Operating Co Previously Submitted Response to NRC Rai.New Pages Include Expanded Answer to Question 4.b1999-06-16016 June 1999 Forwards Amended Pages for Insertion Into South Texas Project Nuclear Operating Co Previously Submitted Response to NRC Rai.New Pages Include Expanded Answer to Question 4.b NOC-AE-000548, Forwards Response to RAI Re Proposed Amends on Replacement SG Water Level Trip Setpoint Differences for Stp,Units 1 & 2.Nothing Contained in Response Should Be Considered Commitment Unless So Specified in Separate Correspondence1999-06-16016 June 1999 Forwards Response to RAI Re Proposed Amends on Replacement SG Water Level Trip Setpoint Differences for Stp,Units 1 & 2.Nothing Contained in Response Should Be Considered Commitment Unless So Specified in Separate Correspondence NOC-AE-000561, Forwards Change QA-042 to Operations QAP, Rev 13, Reflecting Current Organizational Alignment for STP & Culminating Organizational Realigment That Has Been Taking Place During Past Several Months1999-06-15015 June 1999 Forwards Change QA-042 to Operations QAP, Rev 13, Reflecting Current Organizational Alignment for STP & Culminating Organizational Realigment That Has Been Taking Place During Past Several Months NOC-AE-0559, Forwards STP Commitment Change Summary Rept for Period 981209-990610.Rept Lists Each Commitment for Which Change Was Made During Reporting Period & Provides Basis for Each Change1999-06-15015 June 1999 Forwards STP Commitment Change Summary Rept for Period 981209-990610.Rept Lists Each Commitment for Which Change Was Made During Reporting Period & Provides Basis for Each Change NOC-AE-000499, Forwards Relief Request RR-ENG-2-3,proposing to Perform Alternative Ultrasonic Examination from Outside Surface of Skirt Attachment Weld as Described in Encl,In Lieu of Surface Examination from Inside Pressurizer Skirt1999-06-0909 June 1999 Forwards Relief Request RR-ENG-2-3,proposing to Perform Alternative Ultrasonic Examination from Outside Surface of Skirt Attachment Weld as Described in Encl,In Lieu of Surface Examination from Inside Pressurizer Skirt NOC-AE-000502, Forwards Relief Request RR-ENG-2-6,proposing That Boroscopic VT-1 Visual Examination Be Allowed as Alternative to Section XI Surface Examination of Pump Casing Welds,Or Portions of Welds within Pits1999-06-0909 June 1999 Forwards Relief Request RR-ENG-2-6,proposing That Boroscopic VT-1 Visual Examination Be Allowed as Alternative to Section XI Surface Examination of Pump Casing Welds,Or Portions of Welds within Pits NOC-AE-000500, Forwards Relief Request RR-ENG-2-4,proposing to Perform Alternative Ultrasonic Examination from Outside & End Surfaces of Reactor Vessel Closure Head Nuts,As Described in Encl in Lieu of Surface Examination of Threaded Region1999-06-0909 June 1999 Forwards Relief Request RR-ENG-2-4,proposing to Perform Alternative Ultrasonic Examination from Outside & End Surfaces of Reactor Vessel Closure Head Nuts,As Described in Encl in Lieu of Surface Examination of Threaded Region NOC-AE-000545, Forwards Response to NRC 990416 RAI Re Util Proposed Amend on Operator Action for Small Break Loca, .Draft EOP Re Small Break Loca,Encl to Aid Discussion of Proposed Amend1999-05-31031 May 1999 Forwards Response to NRC 990416 RAI Re Util Proposed Amend on Operator Action for Small Break Loca, .Draft EOP Re Small Break Loca,Encl to Aid Discussion of Proposed Amend 1999-09-09
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Jum 16,1999 NOC-AE-000565 File No.: G20.02.01 G21.02.01 10CFR50.90 U. S. Nuclear Regulatory Commission Attention: Document ControlDesk Washington,DC 20555 South Texas Project Units 1 and 2 Docket Nos. STN 50-498 and STN 50-499 Amended Pages for Response to Request for AdditionalInformation on Proposed Amendment to Technical Specifications to Reflect Replacement Steam Generator Reactor Coolant Flow Differences
References:
- 1) Letter from S. E. Thomas to U.S. Nuclear Regulatory Commission dated May 20,1999, (NOC-AE-000540) " Response to Request for Additional Information on Proposed Amendment to Technical Specifications to Reflect Replacement Steam Generator Reactor Coolant Flow Differences" Attached are amended pages for insertion into South Texas Project Nuclear Operating Company's previously submitted response (Ref 1) to the U. S. Nuclear Regulatory Commission Request for AdditionalInformation. The new pages include an expanded answer to question 4.b.
(
Please replace pages 1 of 11 through 11 of 11 in NOC-AE-000540 with the attached pages 1 of 12 through 12 of 12. All text pages are replaced because of changes in page numbers and page mugins to accommodate the added detail. No other significant changes were made.
If there are questions, please contact Mr. M. E. Kanavos (512) 972-7181, or me (512) 972-7162.
/
') 9 i 4 S. E. Thomas Manager 'JD/
Design Engineering sw SET /MEK/MTVN oMk98 PDR STI: 30897184 J
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NOC-AE-000540 L
May 20,1999
- l. .cc:
. Ellis W. Merschoff Jon C. Wood Regional Admmistrator, Region IV . Matthews & Branscomb U. S. Nuclear Regulatory Commission One Alamo Center 611 Ryan Plaza Drive, Suite 400 106 S. St. Mary's Street, Suite 700
, Arlington, TX 76011-8064 San Antonio, TX 78205-3692 1'
, Thomas W. Alexion Institute of Nuclear Power
' Project Manager, MailCode 13H3 Operations - Records Center U. S. Nuclear Regulatory Commission 700 Galleria Parkway Washington, DC 20555-0001 Atlanta, GA 30339-5957 Cornelius F. O'Keefe Richard A. Ratliff Sr. Resident Inspector Bureau of Radiation Control c/o U. S. Nuclear Regulatory Commission Texas Department of Health i P. O. Box 910 1100 West 49th Street Bay City, TX 77404-0910 Austin,TX 78756-3189 J. R., Newman, Esquire D. G. Tees /R. L. Balcom Morgan,I2wis & Bockius Houston Lighting & Power Co.
1800 M. Street, N.W. - P. O. Box 1700 L Washington, DC 20036-5869 Houston,TX 77251 M. T. Hardt/W. C. Gunst Central Power and Light Company City Public Service ATTN: G. E. Vaughn/C. A. Johnson
- P.'O. Box 1771 P. O. Box 289, Mail Code: N5012 San Antonio,TX 78296 Wadsworth,TX 77483
- A. Ramirez/C. M. Canady U. S. Nuclear Regulatory Commission
- City of Austin Attention: Document Control Desk-:
Electric Utility Department Washington, D.C. 20555-0001 721 Barton Springs Road Austin,TX 78704 l
l 5
S11:30897184
NOC-AE-000540 May 20,1999 l Page1of12 Request for Additional Information Regarding Technical Soecifications to Reflect !
Replacement Steam Generator Reactor Coolant Flow Differences South Texas Pro _iect. Units 1 and 2 1.
Page 2 refers to two changes made to reduce vertical uplVtforces on the reactor core: (1) removal of the reactor vessel headflow nouleplugs (T-cold conversion), and (2) removing thimbleplugging devices on thefuelassemblies. Pleaseprovide or reference drawings showing each of these modifications.
(See annotated drawings in Attachment 1)
- 2. Discuss orprovide references to the methods that were used in determining the OTAT '
and OPAT trip setpoints. Justify that the safety limits and[OTAT and OPAT trip] \
setpoints are adequate to providefor DNBR protection. I As discussed in WCAP-8745-P-A (Ref.1), reactor core safety limits are comprised of vessel exit boiling limits and DNB core thermal limits (DNB limit lines). The core safety limits presented in the South Texas Project (STP) Technical Specifications (TS) are defined in terms of reactor coolant system Tivo as a function of power level. Because increased vessel
{
flow rate causes a downward shift in T Avo for a given Vessel inlet temperature, TS Safety '
Limits had to be revised. WCAP-8745-P-A (Ref.1) methodology was applied to STP Replacement Steam Generators and results showed that existing OPAT and OTAT setpoint equations protect core safety limits. Therefore, OTAT and OPAT setpoints provide adequate protection of core thermallimits.
3.
Page 6 states that a specified number of the reactor vessel upper headflow noule plugs will be removed to increase coolingflow to the upper head region so that the vesselinlet temperature (T-cold) will be achieved in this region. Discuss andjustify how this number willbe determined.
A thermal-hydraulic reactor internals vessel evaluation was performed to predict upper-head region fluid temperature by modeling the STP pressurized water reactor vessel and internals system. This approach to analysis has been justified by comparing calculated results with !
empirical data from various plants. Excellent agreement between calculated results and actual measurements confirms that the methodology yields reliable information.
An iterative solution technique was used to establish the reactor internals modification design for directing flow from the downcomer region into the upper head region. This design process also considered uncertainties on the pressure loss coefficients in order to ensure that the vessel inlet temperature (T-cold) will be achieved in the upper head region at 100%
steady state full power STI: 30897184 s
. NOC-AE-000540 May 20,1999 l Page 2 of 12 4a. 4 What specific events were reanalyzed, what specific events were not reanalyzed, and providejustificationfor not reanalyzing the other events. l 15.1.1 Feedwater System Malfunctions Causing a Reduction in Feedwater Temperature l
Event evaluated.
1 South Texas UFSAR (Section 15.1.1) discusses increased thermal load due to opening of the high pressure feedwater heater bypass valve, or closing of steam extraction valves to the high pressure feedwater heater. These would result in a transient very similar to the excessive load increase event (UFSAR 15.1.3), but one of reduced magnitude. This remains a valid conclusion with the A94 replacement steam generators (RSG). This feedwater temperature reduction event is also bounded by the feedwater malfunction event reanalyzed for the RSG program that causes an increase in feedwater flow (UFSAR 15.1.2).
15.1.2 Feedwater System Malfunctions Causing an Increase in Feedwater Flow e Full Power Conditions -
Event reanalyzed e Hot Zero Power Conditions - Event Evaluated With Model E cteam generators, results of the hot zero power (HZP) feedwater j
malfunction (FWM) analysis are non-limiting, i.e., no voids were predicted, thus there is no DNB. Compared to results of the HZP steamline break (SLB) analysis with Model E steam generators, results of the HZP FWM analysis are much less limiting. Based on changes expected with A94 replacement steam generators, e.g., reactor coolant flow differences, the HZP MSLB analysis j results bound results of HZP FWM analysis.
{
15.1.5 Spectrum of Steam System Piping Failures Inside and Outside Containment l
Hot Zero Power Conditions - Event reanalyzed Results of HZP MSLB - Core Response analysis for the replacement using {
Model A94 steam generators (RETRAN) are much less limiting than results i obtained in analysis with the Model E steam generators (LOFTRAN).
Event reanalyzed j
Although results of the full power MSLB analysis are not discussed in the South Texas Project UFSAR, a cycle-specific DNB evaluation is performed for every STPNOC core reload design.
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'* NOC-AE-000540 May 20,1999 Page 3 of 12 15.2.2 Loss of External Electrical Load -
Event evuluated As discussed in the South Texas UFSAR, a loss of external load event results in a Nuclear Steam Supply System (NSSS) transient that is less severe than a turbine trip event. Thus, a detailed transient analysis is not performed for this event because it is bounded by the reanalyzed turbine trip event.
15.23 Turbine Trip -
Event reanalyzed 4b.
Provide values for the partial derivatives used in the RETRAN DNBR model andjustify that these values are conservativefor the DNBR analysis ofSouth Texas.
Figure 1 shows two sets of core thermal limit lines in terms of core inlet temperature as a function of core power for the South Texas Project (STP). The limit lines identified as
" Actual" were developed based on a reference power shape, using the methodology described in WCAP-11397-P-A (" Revised Thermal Design Procedure") and were used to generate Technical Specification Figure 2.1-2 and to revise Updated Final Safety Analysis Report (UFSAR) Figure 15.0-1. These " Actual" limit lines are part of the reactor core safety limits which, as discussed in the response to question 2 of this request for additional information (RAI), were shown to be protected by the existing OPAT and OTAT setpoint equations. Note that the limit lines of Figure 1 are presented with core powers ranging from 80% of nominal up to 120% of nominal, although departure from nucleate boiling (DNB) is not the limiting condition tnroughout this range. Depending on the pressure, there is a power level below which hot leg saturation becomes the limiting condition, and at some paint, the main steam safety valves will actuate to preclude additional primary-side heatup. The OTAT reactor protection function is designed to prevent the occurrence of saturated conditions within the hot legs, and to preclude DNB conditions within the core for power levels not protected by the OPAT trip. The OPAT reactor protection function prevents operation above 118% of rated thermal power (RTP).
The " Adjusted" core thermal limits of Figure I were developed from the " Actual" limits and account for variations in the core axial power shape. During the development of the OTAT setpoint equation for South Texas, the value for the K1 gain (see WCAP-8745-P-A) was reduced to allow widening the f(edeadband. The deadband was widened to permit normal j plant operation without operating in the f(e penalty region. The DNB core thermal limits j were reduced to address the effects of the wider range of power shapes that can occur with the expanded fa dead-band. These reduced limits still represent the limiting DNBR of 1.38.
The partial derivatives used in the RETRAN DNB ratio (DNBR) model are based on the
" Adjusted" core limits and it has been verified that the OTAT setpoint equation protects these " Adjusted" core limits.
Figure 2 shows a comparison of the " Adjusted" core limits presented in Figure I and the conditions that correspond to the DNBR limit (1.38) as predicted by the RETRAN DNBR model. This model used the partial derivative coefficients presented in Table 1. Note that the plots of Figure 2 are presented in terms of reactor coolant system T VOA as a funClion of core power rather than core inlet temperature as a function of core power. The RETRAN ST!: 30897184
NOC-AB-CC0540 May 20,1999 Page 4 of 12 DNBR modelis applicable at or above full power conditions for all pressures between the low pressurizer pressure reactor trip setpoint (1845 psia) and the high pressurizer pressure reactor trip setpoint (2435 psia) assumed in the safety analysis. This comparison shows that the RETRAN DNBR model closely predicts the limiting DNBR at pressures equal to or greater than the nominal (2250 psia) pressure. At pressures below nominal pressure, the RETRAN DNBR model conservatively predicts the limiting DNBR to occur at temperatures that are less than the core limit values. With this, it is concluded that the partial derivative coefficients used in the RETRAN DNBR model are conservative for DNBR evaluations of applicable transients postulated for STP.
Table 1 RETRAN DNBR Calculation inputs N703849 l
l 703851 703852 l
Word 5 (CGAIN)
Word 5 (CGAIN) _l l -0.0524 0.005631 l
l l Word 6 (CPI) l 0.07428 l l 703853 l Word 5 (CGAIN) l 122.0 l l 703854 l 703858 l Word 6 (CPI) [ -619.27 l l Word 5 (CGAIN) l -0.027674 .l l 703897 l ,j Word 6 (CPI) 1.38 l STI: 30897184
NOC-AE-000540
' May 20,1999 Page 5 of 12 Figure 1 South Texas DNB Limit Lines (Actual vs. Adjusted) 640
. P = 2450 psia 630 -
g P = 2400 pela [A \
620-N*
t, ,
610- g% l P = 2000 psia qY g s 4 % N N*N'Ni e
P = 1775 psia GY\
. s. *%,
\ *
4 % % \ %%
S 5' ' N g N =
Ng
N *
\
s
\ b * "k
% 4 \
670 - \ g h g %
h \ \
660 - *
~
Adjusted g \
550 Adual
\
640-
\ %
l 530 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 Power (fraction of nominal)
STI: 30897184
NOC-AE-000540 May 20,1999 l Page 6 of 12 )
Figure 2 South Texas Core Umits (x,*8teted vs. RETRAN") ,
655 RETRAN P = 2450 pala*-'%, " "
P = 2400 pala* ,% Adjusted g, %,,
t P = 2250 pala*
% =
.'*** re #,, %,
F* .
'w I s,%,
615- 1 l { %g
(; P = 2000 psla*
-e f l l
w,'*-
, j,, ,
' )
b 595 - P = 1830 pela*
I I
, 'i ' =,,
==.. .
is i ,
I
" ", * * = d: e m
,7%
h
.* =
t .
- %==*- m,* = '
I I I 4
- : =* e i . . I I
- 1 i : :
I 1 1 555 ' ' ' ' '
O.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 Power (Fraction of Nominal) var P e 1830,2000, and 2250 paw the - --- Imes iderely the power traction below whch the Ernamg condson transfers from DNB to hot leg saturden, For P = 2400 and 2450 peu, the - - - anos identfy the power tracten below whch the Man Stearn Safsty Valves actude.
"'The RETRAN DNBA niodel coefficierts are appleable d power levels aquel to or greater than 100% of nommaL 4c. For MSLB:
Discuss how skewedflux shapes were evaluated.
For the HZP MSLB, the statepoint condition, with cold, non-uniform inlet temperatures and ARI, minus the worst stuck rod, is modeled in 3D each cycle. Similarly, for the full-power j MSLB statepoint condition, a 3D analysis is performed each cycle. Therefore, skewed flux shapes are explicitly modeled on a cycle-specific basis.
Discuss how initial core fuel and cladding temperatures were determined for input to RETRAN.
The revised thermal safety model described in WCAP-10851-P-A (Ref. 7) was used to calculate fuel and cladding temperatures using the PAD fuel performance code. This is the same method applied in evaluating fuel temperatures for recent South Texas Project core reload designs.
STI: 30897184
NOC-AE-000540 May 20,1999 Page 7 of 12 What minimum DNBR was determinedfor the MSLB andfor what break size, power level, and singlefailure assumptions.
Hot Zero Power Conditions Due to the asymmetric nature of this event, core power distribution has a significant impact on DNBR. A minimum DNBR was not explicitly calculated for the RETRAN hot zero power MSLB event. However it has been shown that the RETRAN MSLB (double-ended rupture) analysis results are significantly less limiting than the LOFTRAN i MSLB analysis results. Technical reasons for this are discussed in WCAP-14882 (Ref. 4). The peak heat flux fraction calculated in the RETRAN analysis was 5.4%.
compared to 11.8% calculated in the LOFfRAN analysis. The limiting single failure assumed in these analyses is the loss of one train of safety injection.
Full Power Conditions A spectrum of break sizes representing line and header breaks was examined in the full power MSLB analysis. The limiting break size was determined to be 1.09 ft 2 . The 4
DNBR results are 1.629 for the thimble cell and 1.666 for the typical cell. The corresponding DNBR Safety Analysis Limits are 1.38 (thimble) and 1.43 (typical), and the limiting single failure assumed is failure of one protection train.
t 4d.
If continuous operation with a feedwater heater out of service is planned, was the single failure of a secondfeedwater heater evaluated as part of the DNBR evaluations? What would be the effect on DNBRfrom failure of the secondfeedwater heater?
The single failure of a second feedwater heater was not explicitly examined. To account for the rare occasion when a high pressure feedwater heater is not available, a feedwater temperature range of 390 F to 440 F was covered in the analyses that support the A94 RSG Program. In the event of a second feedwater heater should fail, resulting in a feedwater temperature of approximately 378 F, sufficient DNB margin would continue to exist.
5.
Page 16 provides a table of minimum measuredflow and thermal design flow including the expected core bypassfor the two steam generator types. Describe how theflow rates
\
are determined. '
First a background discussion is provided defining the terms Best Estimate Flow (BEF).
Thermal Design Flow (TDF), and Minimum Measured Flow (MMF). A discussion of Core !
Bypass methodologyis then presented. This is followed by a discussion of the differences between core bypass flows presented in the table. Finally, the specific answer to the question will be provided.
1 STI:30897184
[ ,
NOC-AE-000540 May 20,1999 Page 8 of 12 BACKGROUND DISCUSSION BEF is calculated by a Westinghouse computer model of the Reactor Coolant System (RCS) that includes STP plant-specific design parameters. These parameters account for vessel and fuel hydraulic design characteristics, system losses, RC pump hydraulic performance, and the hydraulic characteristics of the RCS. BEF represents an expected RCS flow value in a normally functioning plant at full power and nominal design conditions, and can be used as a point of reference for establishing minimum design flow values. The A94 replacement steam generators have more steam generator tubes than the Model E that they replace, which lowers the pressure drop across the primary side. This results in an increased BEF.
TDF is an assumed RCS flow value. It is chosen to be greater than the mmimum required )
flow to prevent DNB, but less than the minimum expected flow when considering conditions that might diminish RCS flow during plant life (increases in steam generator plugging levels, pump impeller smoothing, anticipated fuel changes, etc). The TDF is used in the safety analysis where a low RCS flow is conservative.
MMF is TDF increased by flow measurement uncertainty (MMF = TDF*[1+ uncertainty]). l The plant uses MMF as the minimum RCS flow Technical Specification (TS) surveillance value.
CORE BYPASS METHODOLOGY' Calculation of core bypass flow is performed to determine the amount of flow through each flow path not considered effective for cooling of the nuclear fuel. These flow paths include:
- 1. Flow through spray nozzles into upper head for head cooling purposes.
- 2. Flow through fuel assembly rod cluster control guide thimbles for cooling control rods.
- 3. Leakage flow from the vessel inlet nozzle, directly to the vessel outlet nozzle, through the gap between the vessel and the barrel.
- 4. Baffle and core barrel cooling flow that is not considered available for core cooling.
- 5. Flow in gaps between fuel assemblies on the core periphery and the adjacent baffle wall.
The Revised Thermal Design Procedure (RTDP) method uses the nominal manufacturing values in the calculation of this bypass flow. The Standard Design Procedure (STDP) uses the nominal manufacturing values with uncertainties in the conservative direction. 'Ihis accounts for the different core bypass values for the same model of steam generator when the different methodologies are used.
l DIFFERENCES BETWEEN CORE BYPASS FLOWS Mode E and A94 steam generators core bypass differences shown on the table are:
Increased flow to the upper head: To mitigate the impact of temperature on INCONEL
' 600 welds in the reactor vessel upper head, STP elected to reduce the upper head STI: 30897184
- NOC-AE-CD0340 May 20,1999 Page 9 of 12 temperature to the temperature of RCS cold leg. This required an increase in core bypass flow to the upper head.
Remove the rod cluster control guide thimble plugs from the fuel: The rod cluster control guide thimble plugs are being removed to reduced uplift forces on the fuel due to the higher RCS flow rate. This eliminates the need for stronger fuel assembly hold-down springs and reduces the potential for rod bowing experienced at STP.
ANSWER TO THE QUESTION To reduce the cost of replacement steam generators, STP elected to choose a TDF that would not require a re-analysis of the DNB events. To accomplish this goal, a TDF of 392,000 GPM was selected. This value ensures that the limiting DNB events which are modeled with the RTDP methodology would remain bounding because of a 0,4% increase in reactor core flow. DNB events modeled with STDP were shown to have sufficient margin to accommodate a 1.6% decrease in reactor core flow.
Based on the TDF determined above, the MMF was selected based on 2.8% measurement uncertainty. The MMF value is adequate to ensure that MMF can be maintained as steam generator tubes are plugged and anticipated plant conditions occur.
- 6. Of the non LOCA transients and accidents that were reanalyzed in NOC-AE-0080, for which event was the minimum DNBR calculated? What was the change in DNBR from \
this eventfor the steam generator replacement and how does the new value compare to the DNBR limitsforSouth Texas Project?
A summary of the minunum DNBR results for each DNB-limiting event reanalyzed is provided below.
Limiting Full Power Feedwater Malfunction (with Manual Rod Control): ;
MDNBR(Model A94) = 1.604 (RETRAN-predicted)
MDNBR(Model E) = 1.777 (LOFFRAN-predicted) !
MDNBR(Limit) = 1.38 Turbine Trip with Minimum Reactivity Feedback and Automatic Pressurizer Pressure Control:
MDNBR(Model A94) = 1.559 (RETRAN-predicted)
MDNBR(Model E) = 1.670 (LOFTRAN-predicted)
MDNBR(Limit) = 1.38 2
IIot Zero Power MSLB (1.4 ft double-ended rupture) at End of Cycle Conditions:
MDNBR(Model A94) = Not calculated (bounded by Model E)
MDNBR(Model E) =
2.43 - Thimble Cell (THINC-calculated)*
= 2.70 - Typical Cell (THINC-calculated)*
MDNBR(Limit) = 1.45 (w/o flow anomaly penalty)
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- NOC-AE-0CD540 May 20,1999 Page 10 of 12 2 2 Full Power MSLB (1.09 ft for Model A94 and 1.06 ft for Model E) at End of Cycle Conditions:
MDNBR(Model A94) =
1.629 - Thimble Cell (THINC calculated)
= 1.666 - Typical Cell (THINC-calculated)
MDNBR(Model E) = 1.85 -
Thimble Cell (THINC-calculated)* l
= 1.89 -
Typical Cell (THINC-calculated)*
MDNBR(Limit) = 1.38 (Thimble Cell)
= 1.43 (Typical Cell)
- Cycle dependent; indicated values are for STP Unit 1 Cycle 9.
i For which event was the maximum reactor coolant system pressure calculated? What was the change in calculated reactor coolant system pressure for the steam generator replacement and how does the new pressure compare to the maximum allowable reactor coolant system pressurefor South Texas Project?
The turbine trip event with minimum reactivity feedback and no automatic pressurizer pressure control was most limiting with respect to the peak reactor coolant systera (RCS) pressure. The maximum calculated RCS pressure with the Model A94 steam generators (RETRAN) was 2743.5 psia. This pressure is 1.5 psiless than the maximum calculated RCS pressure with the Model E steam generators (LOFFRAN) and 5 psi less than the maximum allowable RCS pressure.
7.
Address each of the three conditions listed in the conclusions section of the NRC staff SERfor WCAP-14882.
The NRC staff concludes in the SERfor WCAP-14882 (Ref. 5) that the "use ofRETRAN as described in WCAP-14882 is acceptablefor licensing calculations and RETRAN may be used to replace the LOFTRAN computer code in Westinghouse reload methodology provided that thefollowing conditions are met:
- 1. The transients and accidents that Westinghouse proposes to analyze with RETRAN are listed in this SER (Table 1) and the NRC staff review of RETRAN usage by Westinghouse was limited to this set. Use of this codefor other analyticalpurposes willrequire additionaljustification.
2.
WCAP-14882 describes modeling of Westinghouse designed 4., 3, and 2 loop plants of the type that are currently operating. Use of the code to analyze other designs, including the Westinghouse AP600, willrequire additionaljustification.
3 l Conservative safety analyses using RETRAN are dependent on the selection of \
conservative input. Acceptable methodology for developing plant-specific input is l discussed in WCAP-14882 and in Reference 6. Licensing applications using \
RETRAN should include the source of andjustificationfor the input data used in the i
analysis."
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NOC-AE-000540
,- ~* . May 20,1999 Page 11 of 12 i
l Each of these conditions are addressed below, as they relate to the South Texas Project Model A94 Replacement Steam Generator Program.
1.
The non-LOCA transients explicitly analyzed with RETRAN for this program include the
{
following: feedwater system malfunctions, steam system piping failures, turbine trip, loss I of offsite power, loss of normal feedwater flow, and feedwater system pipe break. All of these events are listed in Table 1 of the SER; therefore, no additional justification is required.
2.
The South Texas Project nuclear units are 4-loop, Westinghouse-designed, pressurized water reactors that are currently in commercial operation. Therefore, no additional justification is required.
- 3. The non-LOCA RETRAN analyses were performed in accordance with the methodologies discussed in WCAP-14882 (Ref. 4) and WCAP-9272-P-A (Ref. 6).
I 1
I I
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- ' NOC-AE-000540 May 20,1999 Page 12 of 12 References 1.
WCAP-8745 P-A, " Design Bases for the Thermal Overpower AT and Thermal Overtemperature AT Trip Functions," Ellenberger, S. L., et al., September 1986.
2.
WCAP-7907-P-A, "LOFTRAN Code Description," Burnett, T. W., et al., April 1984.
3.
Letter NSD-NRC-98-5765, H. A. Sepp, (Westinghouse) to T. E. Collins (NRC), " Responses to Request for AdditionalInformation on WCAP-14882, "RETRAN-02 Modeling and Qualification for Westinghouse Pressurized Water Reactor Non-LOCA Safety Analyses" [ Proprietary], August 26,1998.
4.
WCAP-14882 Revision 0, "RETRAN-02 Modeling and Qualification for Westinghouse Pressurized Water Reactor Non-LOCA Safety Analyses," Huegel, D. S., et al., June 1997.
5.
USNRC Letter, " Acceptance for Referencing of Licensing Topical Report WCAP-14882,
'RETRAN-02 Modeling and Qualification for Westinghouse Pressurized Water Reactor Non-LOCA Safety Analysis' (TAC NO. M99107)," Akstulewicz, F. (USNRC) to Sepp, H. (W),
February 11,1999.
6.
WCAP-9272-P-A, " Westinghouse Reload Safety Evaluation Methodology," Bordelon, F. M., et
. al., Approved July 1985.
7.
WCAP-10851-P-A, " Improved Fuel Performance Models for Westinghouse Fuel Rod Design and Safety Evaluations," Weiner, R. A., et al., Approved August 1988.
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