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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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Text
The Light c o mp a ny South Temas Prohct Dectric Generatlog P. O.Station Bom 289 Wadsworth, Temas 77483 llouston 1,Ighting & Power November 11, 1997 ST-HL-AE-5780 File No.: G03.08 10CFR50 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 South Texas Project Units I and 2 Docket Nos. STN 50-498 STN 50-499 Response to Request for Additional Information Regarding Generic Letter 96-06," Assurance of Equipment Operability and Containment intecrity Durine Desien-Basis Accident Conditions"
Reference:
Correspondence from Thomas W. Alexion, Nuclear Regulatory Commission, to William T. Cottle, Houston Lighting & Power Company, dated September 12,1997 Pursuant to the reona" for additional information referenced above, ti.e South Texas Project submits the attached responses to the Nuclear Regulatory Commission's questions regarding our response to Generic 1Aer 96-06, " Assurance of Equipment Operability and Containment Integrity During Design Basis Accident Conditions."
This letter provides the information requested by the Nuclear Regulatory Commission to complete the review of Generic Letter 96-06, and includes detailed information regarding the calculations which support the South Texas Project response to the Generic Letter.
This letter is not considered to contain any commitment beyond a description of how the calculations in question were performed.
If there are any questions, please contact either Mr. K. D. House at (512) 972-8922 or me at (512) 972-7162.
/n Cl_
S. E. Thomas 9711100194 971111 "
p)
DR ADOCK O 8 Manager j
~
Design Engineering PLW/
Attachments: 1) Response to Request for Additional Information Regarding Generic Letter 96-06
- 2) Condition Report Engineering Evaluation No. 96-12151-27
- 3) Cross-Reference Table
- 4) Drawings for Piping and Valves [\,l]{\]{\$[l)})\[\f!\ !!b!,k Project Manager on Behalf of the Participants in the South Temas Project
[($1y g gyj \ h@ \ ri {Tj [f] h! f( C*
llouston Lighting & Power Company South Texas Project Electric Generating Station ST-HL-AE-5780 File No.: G03.08 Page 2 c:
Ellis W. Merschoff Rufus S. Scott Regional Administrator, Region IV Associate General Counsel U. S. Nuclear Regulatory Commission IIouston Lighting & Power Company 611 Ryan Plaza Drive, Suite 400 P, O. Box 61067 Arlington, TX 76011-8064 Houston, TX 77208
- Thomas W. Alexion Institute of Nuclear Power Project Manager, Mail Code: 13H3 Operations - Records Center U. S. Nuclear Regulatory Commission 700 Galleria Parkway Washington, DC 20555-0001 Atlanta, GA 30339-5957 David P. Loveless Dr. Bertram Wolfe Sr. Resident inspector 15453 Via Vaquero c/o U. S. Nuclear Regulatory Comm. Monte Sereno, CA 95030 P. O. Box 910 Bay City, TX 77404-0910 Richard A. Ratliff Bureau of Radiation Control J. R. Newman, Esquire Texas Department of Health Morgan, Lewis & Bockius 1100 West 49th Street 1800 M Street, N.W. Austin, TX 78756-3189 Washington, DC 20036-5869 M. T. Hardt/W. C. Gunst J. R. Egan, Esquire City Public Service Egan & Associates, P.C.
P. O. Box 1771 2300 N Street, N.W.
San Antonio, TX 78296 Washington, D.C.
J. C. Lanier/M. B. Lee *U. S. Nuclear Regulatory Comm.
City of Austin Attn: Document Control Desk Electric Utility Department Washington, D.C. 20555-0001 721 Barton Springs Road Austin, TX 78704 Central 1 ower and Light Company ATTN: G. E. Vaughn./C. A. Johnson P. O. Box 289, Mail Code: N5012 Wadsworth, TX 77483
- Above copies distributed without Attachment 4, except as noted by asterisk.
J
+--b - a a sas-- n a a -r4-a as ,n--' a aL,-&--
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ATTACHMENT 1 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING GENERIC LETTER 96-06
- , . n.-
Attachment 1 ST-IIL-AE-5780 Page 1 of 12 South Texas Project Units 1 and 2 Resoonse to Request for Additional Information Recardine Generic Letter 96-06 OUESTION 1:
The January 28,1997, submittal, indicated that nine piping runs susceptible to thermally induced overpressure were determined to be acceptable based on the valve design. These piping runs contained either spring-loaded valves that form isolation barriers or valves that will self-relieve through leakage that form isolation barriers. In the submittal, it was stated that these valves would relieve water to preclude an overpressure condition.
Provide the following information for each piping run evaluated in this manner:
OUESTION la:
Describe the applicable design criteria for the piping and the valves. Include the required load combinations.
RESPONSE
The piping and valves were evaluated in accordance with the pressure and stress criteria for faulted conditions (Level D service limits) as specified in ASME B&PV Code, Section 111 Subsection NC,1974 Edition through Winter 1975 Addenda. Other addenda used are: Subsections NC-3611.2 and NC-3500, Table NC-3521-1 of Winter 1976 Addenda.
The following load comnination was used:
Pressure + Dead Weight + Occasional loads (faulted)
OUESTION lh; Provi<ie a drawing of the valve. Provide the pressure at which the valve was determined to hi. off its seat or leak and describe the method used to estimate this pressure. Discuss any sources of uncertainty associated with the lift off pressure.
RESPONSE
Drawings of the valves are provided in Attachment 4. For cross-reference purposes, a table is provided in Attachment 3 identifying the valve numbers and the associated drawing numbers for each case evaluated.
For spring-loaded air-operated valves that were credited for overpressure protection, the pressure at which the valve was determined to lift offits seat was calculated based on its actuator benchset pressure, actuator diaphragm effective area, and valve plug cross-section area. The actuator benchset pressure is the field measured value at which the
Attachment i ST.HL-AE-5780 l Page 2 of 12 l valve starts to move off its seat against the spring and packing forces as air pressure is i applied to the valve diaphragm. The benchset pressures are documented in the South i Texas Project Valve Scaling Sheets and are included in Attachment 3. j In most cases, a pressure value higher than the actual benchset pressure was conservatively used in the evaluation in order to account for uncertainty. In the remaining case (Case #5, Attachment 3),16 psig is used f'r both the actual benchset pressure and the benchset pressure used. This is acceptable because the uncenainty associated with the benchset pressure is expected to be negligible due to these air-operated valves being small sampling valves that are operated frequently, Additional calculations are expected to be performed to determine if a design basis accident will result in pressures less than the actual benchset pressure, Credit for overpressurization protection provided by the spring-loaded air-operated valves may not be necessary pending the results of the final calculation.
Additional details are provided in Condition Repon Engineering Evaluation No. 96-12151-27 (Attachment 2).
OUESTION le:
Provide the maximum-calculated stress in the piping run based on th< 1 'imated lift off or leakage pressure.
RESPONSE
The maximum calculated stresses for all ten cases evaluated in Condition Report Engineering Evaluation No. 96-12151-27 (Attachment 2) are summarized as follows:
CASE NO, I,INE NO. MAXIMUM AI,1,0WAHLE STRESS , PSI STRESS , PSI GROUP 1: (FAULTED) 1 3/4"-SI-1321-BB2 31,856 36,720 2 1"-PS-1005-BB2 23,234 37,680 3 1"-PS.1002-BB2 _ 30,686 37,680 4 1"-PS-1003-UB2 37,038 37,680 5 '" PS-10N-UB2
- 35,194 37,680 6 . -ED-ll24-SB2 9,870 37,680 GROUP 2:
7 8"-RH-1204-KB2 26,762 37,680 8 8"-RH-1304 KB2 26,762 37,680 9 1"-PS-1016-BB2 30,204 37,680 10 3"-WL- 1009-RB2 14,839 37,680 l
l
Attachment 1 ST Hi-AB 5780 Page 3 of 12 The-maximum stress values were conservatively calculated by adding the new stress values to the existing stress values previously computed in the design calculations.
Additional margins are available because the highest stress value taken from the most limiting data point in the boundary of the design calculation was conservatively used.
The actual stress values of the data points located between the containment isolation valves are much lower.
OUESTION 2:
The January 28,1997, submittal, indicated that the reactor coolant pump drain tank line was insulated in order to maintain piping stresses within the allowable limits. Provide the following information for this piping run:
OUESTION 2a:
Provide the applicable design criteria for the piping and the valves. Include the required load combinations.
RESPONSE
The piping and valves were evaluated in accordance with the pressure and stress criteria for faulted conditions (12 vel D service limits) as specified in ASME B&PV Code,Section III Subsection NC,1974 Edition through Winter 1975 Addenda. Other addenda used are Subsections NC-3611.2 and NC-3500, Table NC-3521-1 of Winter 1976 Addenda.
The following load combination was used:
Pressure + Dead Weight + Occasional loads (faulted)
OUESTION 2h:
Provide a drawing of the piping run between the isolation valves. Include the lengths and thicknesses of the piping segments and the type and thickness of the insulation.
RESPONSfg Drawings of the piping runs and information concerning the piping and insulation are provided in Attachments 3 and 4. Refer to Case # 10 of Attachment 3 for information relating to the reactor coolant drain tank line.
00ESTION 2c:
Provide the maximum-calculated temperature and pressux for the pipe run. Describe, in detail, the method used to calculate these pressure and temperature values. This should
Attachment 1 ST HL-AE-5780 Page 4 of 12 include a discussion on the heat transfer model used in the analysis and the basis for the heat transfer coefficients used in the analysis.
RESf0NSE1 2.c.a Maximum calculated temperature and pressure for the pipe run:
An evaluation of the maximum pipe temperature and pressure has been performed using the following initial conditions:
Tpgani, = 75 'F Pppanii = 150 psig Tconi = Temperature profile calculated in the LOCA analysis of record hconi = Condensing heat transfer coefficient calculated in the LOCA analysis of record Based on these initial conditions, the maximum temperature and pressure were determined to be:
T ino = 128 *F.
P nu i
= 2690 psig.
The calculations performed to determine these values are being incorporated into the South Texas Project design basis.
2.c.h Method used to calculate these pressure and temperature values:
2.c.h.1 Methodology The methodology implemented by the South Texas Project to address pipe pressurization in isolated lines due to the heating of trapped fluid following a design basis accident is based on the methodology presented in Reference 1. Specifically, the calculations are based on Equation 19 of Reference 1 (reproduced below as Equation 1) and the assumption that mass is conserved in the isolated volume. Equation I presents the derivative of the pipe volume as a function of the change in pipe internal pressure and temperature with respect to time.
~ ~ '
dV
-=
5n IW dp + -
3nctLD' dT dt E,quation I
_16Et _ di _
4 _
di Where V is the initial pipe volume, t is time, L is the pipe length, D is the pipe inner diameter, t is the thickness of the pipe, E is the modulus of elasticity of the pipe material, p is the trapped fluid pressure, a is the coefficient of thermal expansion of the pipe material, and T is the pipe temperature.
Attachment 1 ST.HL-AE-5780 Page 5 of 12 Assuming that the changes in pipe dimensions are negligible when compared to the changes in temperature and pressure, Equation 1 may be written as:
JV
-=V
' 5D ' dp + 3a dT' Equation 2 dt u 4Er. dt dt ,
Where V = nD2 U4 Integrating Equation 2 with respect to time and rearranging the terms yields:
dV S D dp + 3adT
-= Equation 3 V 4rE Assuming dV to be much smaller than V, Equation 3 becomes:
AV 5 D Ap + 3aAT
= Equation 4 V 4t E Therefore, a given increase in temperature and pressure results in a final piping volume that is independent of the order of pressurization and heating. Consequently, the expansion process can be treated in two independent steps: an expansion due to heating, and an expansion due to pressurization. Additionally, the volume of the fluid trapped inside the pipe section is assumed to be equal to the volume of the pipe section.
2.c.h.2 Expansion Due to Pipe Heating The isolated pipe section under consideration is assumed to begin inside containment, pass through the containment wall, and run for some distance outside containment. Th..
results in three distinct piping sections to be considered in the heat-up and pressurization analysis:
- 1. The section inside reactor containment (IRC).
- 2. The containment penetration, and
- 3. The sectiori outside reactor containment (ORC).
Assuming the occurrence of a design basis accident, the IRC pipe section is exposed to elevated temperatures, resulting in heat transfer from the containment atmosphere to the IRC pipe section. Ileat is conducted from the IRC pipe section through the containment penetration to the ORC pipe section. In order to determine thermal expansion of the pipe, heat tnmsfer from containment to the IRC pipe section must be determined followed by determining the heat transfer from the IRC pipe section to the ORC pipe section.
The following assumptions form the basis for the application of Equation 4 with respect to the heat transfer calculations being performed:
- a. The instantaneous heat transfer rau from the containment atmosphere to the trapped fluid in the IRC pipe section can be approximated by the steady state heat transfer rate through the pipe and insulation, if present.
Attachment i ST-HL-AIM 780 Page 6 of 12
- b. The convective heat transfer coefficient describing heat transfer from the inner surface of the pipe to the fluid within the pipe is assumed to be constant. The heat .
transfer coefficient can be approximated using an equation for natural convection from the outer surface of a horizontal cylinder.
- c. Buoyancy induced flow between the IRC and ORC pipe sections does not result in a change in water mass in these sections. IIeat transfer associated with the convective heat transfer that would occur due to buoyancy-induced flow is considered based on Reference 3. See Section 2.c.b.2.2.
2.c.b.2.1 IIcat Transhr from Containment to the IRC Volume lleat transfer from the containment atmosphere to the trapped fluid in the IRC pipe section is approximated by the steady state heat transfer rate as follows:
Tcm - Trac 4 " r 9,8 r 9, + 2 e g,,,
in In I < Di > q D. > I C_,
- As Where c/,,c is the heat transfer rate from containment to the IRC volume, Tcom is the containment temperature, Tinc is the initial IRC volume bulk fluid temperature, Cw is a multiplier applied to the external heat transfer coefficient and is based on NUREG-0588 (IWr nce 5),
ho is the external heat trarm r coefficient, Ao is either:
- a. the outer surface area of the insulation, for the insulated pipe case, or
- b. the outer pipe surface area for the un-insulated case, Do is the outside diameter of the pipe, Da is the inside diameter of the pipe, knre is the thermal conductivity of the pipe material, L is the length of the IRC portion of the pipe, t.
i is the innlation thickness,
- k. i is the thermal conductivity of the insulation material, h, is the pipe inner surface heat transfer coefficient, and Ai is the inner piping surface area of the IRC volume.
A multiplier of 4.0 is applied to the external heat transfer coefficient based on the guidance provided in Reference 5. The external heat transfer coefficient used in the pipe pressurization analysis is based on the condensing heat transfer coefficient calculated by the containment pressure / temperature analysis code for the LOCA analysis of record.
Based on Reference 2, the convective heat transfer coefficient inside the pipe (h,) is calculated for natural convection around a horizontal cylinder. The heat transfer coefficient is calcalated as follows:
Attachment 1 ST-HL-AE-5780 Page 7 of 12 h=k Nu I
Where k is the thermal conductivity of water, 1 is the inner diameter of the pipe, and Nu is the Nusselt number.
The Nusselt number is given for natural convection outside a horizontal cylinder on page 177 of Reference 2 as a function of the Grashof number and Prandtl number.
- Nu = dGr Pr)*
Where c is a constant given as 0.53, Gr is the Grashof number, Pr is the Prandtl number, and n is given as 1/4.
From Reference 2, the Grashof number is calculated as follows:
Gr= Op'fATg ,
Y Where L is the inner diameter of the pipe, p is the density of water, p is the isopiestic coefficient of thermal expansion water at the maximum expected temperature, AT is the maximum temperature difference between the fluid and the pipe wall, g is the gravitational constant (32.2 ft/sec 2), and is the viscosity of water.
Reference 2 also gives the Prandtl number as follows:
Pr =
k Where p is the viscosity of water, Cpis the specific heat of water, and k is the thermal conductivity of water.
2.c.b.2.2 IIcat Transfer from the IRC Volume to the ORC Volume Analysis of heat transfer from the IRC pipe section to the ORC pipe section is accomplished by defining a thermal conductor representing the containment penetration.
Consequently, heat transfer from the IRC to ORC pipe section can be evaluated using the following steady state heat transfer equation:
qonc= Tac- Toac
- 7A ,a Where c/ one is the heat transfer rate between the IRC and ORC volumes, Tine is the initial IRC volume bulk fluid temperature,
Attachment i ST.ll!-AE5780 Page B of 12 Toac is the initial ORC volume bulk Guid temperature, Lry in the IRC/ ORC conductor equivalent length (contain.nent penetration length),
kn.ia is the overall thermal conductivity of the equivalent penetration conductor, and Anna is the sum of the pipe and liquid cross sectional areas.
The thermal propedies of the equivalent penetration conductor are set to allow the conductor to simulate both the conduction through the pipe and '.he convective heat transfer in the water associated whh buoyancy-driven counter current nows in the penetration. Development of the thermal conductivity value for the equivalent conductor is based on Reference 3 and the simplifying assumption that the temperature gradients through the steel and liquid are similar.
Therefore, the overall thermal conauctivity of the conductor can be defined as:
kua = l>Aw a *()/(1/k,qA,) + 1/(1/koA ))
Where ktna is the overall thermal conductivity of the equivalent penetration conductor, L is the length of the penetration, Ana is the sum of the pipe and liquid cross sectional areas, k,y is the equivalent thermal conductivity of the water associated with buoyancy driven f;ows through the penetration, A, is the cross sectional area of the water in the pipe, ko is the thermal conductivity of the pipe material, and Ao is the cross sectional area of the pipe material.
Reference 3 identifies a heat transfer correlation that can be used to estimate the effect of buoyancy induced flows through the penetration based on natural circulation in horizontal piping. Ilased on the Reference 3 correlation, the Nusselt number for fully developed natural circulation in a horizontal piping section with differently heated ends and a Rayleigh number greater than or equal to 3.0x 10' is calculated as follows:
Nu = 0.32*(llri)Ra"25 Where Nu is the Nusselt number for the flow, L is the length of the pipe, ri is the pipe inner radias, and Ra is the Rayleigh number which is defined as:
Ra = (g[lr/AT)/(ap) where g is the acceleration of gravity,
Attachment i ST ill AIM 780 l' age 9 of 12 p is the coefficient of volumetric expansion of water, re is the inner radius of the pipe.
AT is the difference in the end temperatures, u is the thermal diffusivity of water, and is the Kinematic viscosity of water.
Given ths the heat transfu rate through the water portion of the equivalent conductor must be equal to the convective heat transfer rate through both ends of the pipe, the equivalent water thermal conductivity of the equivalent conductor can be determined as follows:
hAAT = ky AAT/L and h=Nu k./L, or Nu k. AAT/L = kmAAT/L Where h is the convectivt heat transfer coefficient associated with the water, kmis the equivaler.t thennal conductivity of the water associated with buoyancy.
driven flows thnwgh the penetration, Nu is the Nusselt Num',er, k, is the thermal conduct!vity of water, A is the cross sectional area of the penetration, AT is the difference in the temperature in the IRC and ORC pipe sections, and L is the totallength of the pipe.
Solving for the equivalent thernal conductivity of the water through the penetration estimating buoyancy-induced flows yields:
ky = Nu
2.c.h.2.3 IRC Pipe Section Temperature Change The evaluation of the temperature change in the IRC pipe section is based on the assumption that the liquid and pipe are at the same temperature. Therefore, the following equation is used to evaluate the temperature change for the liquid in the IRC pipe section:
- r. . 3
- Al Ginc~(}UnC ATinc = Equation 5 (m.
- c,.. .),,c Where [pnc is the heat transfer rate from containment to the IRC volume, c/ onc is the heat transfer rate between the IRC and ORC volumes, At is the time step size, m, is the IRC volume water mass, and cp it the 4RC volume fluid specific heat.
The following equation is used to calculate the temperature in the IRC pipe section at the end of the time period being examined:
Tinc.r = Tinc + ATinc
+
l Attachment i ST.llL. AIM 780 Page 100f 12 Where Times is the final IRC volume bulk Duld temperature, ,
Tinc is the initial IRC volume bulk fluid temperature, and ATine is the IRC volume bulk Hulo temperature change. ;
2.c.h.2.4 ONC Pipe Section Temperature Change The evaluation of the temperature increase of the ORC ponion of the penetration is based on the assumption that the liquid and pipe are considered to be at the same temperature.
The following equation is used to evaluate the temperature increase for the liquid in the i ORC portion of the penetration:
4 onc
- ~ (m.
- cr.n) y, c Where Il onc is the heat transfer rate between the IRC and ORC volumes, At is the time step size,
- m. is tLe ORC volume water mass, cp,, is the ORC volume Guld specific heat, .
m, is the ORC piping steel mass, and c p.a is the ORC piping steel specific heat.
The following equation is used to calculate the temperature in the IRC pipe section at the end of the time period being examined:
Tosc.r = Tonc+ ATosc Where Toucy is the Anal ORC volume bulk fluid temperature, Touc != d e initial ORC volume bulk Duid temperature, and ATonc is the ORC volume bulk Guld temperature change.
2.c.h.2.5 IRC Volume Change Due to Thermal Expansion The volume of the IRC pipe section following the expansion due to a temperature change is calculated based on the temperature change calculated in Equation 5 and the temperature dependent portion of Equation 4 as follows:
l'(T)inc . l'inc * (1 + 3
- ATiac) Equation 7 Where V(T)inc is the final IRC pip. volume following thermal expansion, V ine is the initial IRC pipe volume, u is the piping material coefficient of thermal expansion, and ATine is the IRC volume bulk fluid temperature change.
2.c.h.2.5.1 ORC Volume Change Due to Thermal Expansion The volume of the ORC pipe section following the expansion due to a temperature change is calculated based on the temperature change calculated in Equation 6 and the temperature dependent ponion of Equation 4 as follows:
l'(T)onc a l'onc * (1 + 3
Attachment 1 STill-AE5780 Pye 11 of 12 Where V(Tkmc is the final ORC pipe volume following thermal expansion, i Vonc is the initial ORC pipe volume, u is the piping material coefficient of thermal expansion, and ;
ATouc is the ORC volume bulk fluid temnerature change. ;
2.c.h.3 Expansion Due to Pressure Changes ;
The expansion of the IRC and ORC pipe sections due to changes in pipe pressure are also ;
based on Equatinn 4. The change in pipe volume due to expansion from a pressure !
change is combined with the volume change due to thermal expansion to determine the total volume of the system at the end of the time period being analyzed. The pressure in the system is determined iteratively based on conservation of mass by calculating the system mass following the volume changes. The AP used in Equations 9 and 10 is a ;
guessed value that is us;d to perform an iteration in the determina' ion of the total system mass as given by Equation 11. The iteration on pressure is performed until the total system mass for the time period being analyzed is essentially equal to the mass calculated for the previous time period.
2.c.h.3.1 IRC Volume Due to Thermal and Pressure Expansioit The total volume of the IRC section following the expansion o. the pipe due to the changes in pressure and temperature is calculated based on the volume calculated in Equation 7 and the pressure dependent portion of Equation 4 as follows:
V(P.T)inc = V(T)inc
s 4 r 6s Where V(P, T)me is the IRC volume following the expansion due temperature and pressure increases, V(Thuc is the final IRC pipe volume following thennal expansion, Do is the pipe outside diameter, t is the pipe wall thickness, AP is the pressure change from beginning to end of the time step, and E is the piping material modulus of elasticity.
I 2.c.h.3.2 OMC Volume Following Thermal ami Pressure Expansion Simihtrly, the volume of the ORC pipe section is determined due to expansion from changes in both temperature (Equation 8) and pressure (Equation 4) utilizing the following equation:
V(P.T)onc = V(T)onc
- Equation 10 4 r E, When: V(P. T)one is the ORC volume following the expansion due temperature and pressure increases, V(T)onc is the final ORC pipe volume following thermal expansion, D. is the outside pipe diameter, t is the pipe wall thickness,
, ,.~,m , ,_ .-. - , - - - . - -
Attachment i ST IIL AIM 780 l' age 12 of 12 AP is the pressure change from beginning to end of the time step, and E is the piping material modulus of elasticity.
2.e.h.3.3 Mass Comparison in calculating the total system mass, the IRC and ORC fluid specific volumes are determined using the 1967 IFC formulation for ordinary water substanceH1 based on the temperature and estimated pressure at the end of the time period being analyzed. The total Guld mass in the pipe section is determined based on the IRC and ORC volumes calculated by Equations 9 and 10 as follows:
M = V(P T)inc + V{ P.T)onc Equation 11 thnc tunc Where M is the Guld mass in the isolated pipe, V(P.T)inc is the IRC volume following the expansion due temperature and pressure increases, 1)inc is the IRC Duid specific volume at the final temperature and pressure, V(P, T)one is the ORC volume following the expansion due temperature and pressure increases, and tk>nc is the ORC Duid specine volume at the final temperature and pressure.
The total system mass for the time step being analyzed is then compared to the total system mass from the previous time step. The final system pressure is determined by iterating through Equations 9,10, and 11 for pressure until the system mass at the end of the time step is essentially equal to the mass of Guid in the pipe section at the beginning of the time step.
2.c.h.4 References
- 1. " Analysis of Over-pressure Conditions in an isolated Piping Section," C. J. Foley, Journal of Pressure Vessel Technology, pp. 253-257, May 1977.
- 2. "lleat Transmission," Third Edition, W.11. McAdams,1954.
- 3. "lligh Rayleigh Number lleat Transfer in a llorizontal Cylinder v.ith Adiabatic Wall," G.11. Schiroky and F. Rosenburger, International Journal of Ileat and Mass Transfer, Vol. 27, No. 4, pp. 630-633,1984.
- 4. "A Formulation of the Thermodynamic Properties of Ordinary Water Substance,"
International Formulation Committee (IFC), February 1967.
- 5. NUREG-0588," Interim Staff Position on Environmental Qualification of Safety-Releted Electrical Equipment," Revision 1