Letter Sequence Approval |
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MONTHYEARML0728400492007-10-0202 October 2007
License Amendment Request 07-02, Revision to Technical Specification 3.5.4, Refueling Water Storage Tank
Project stage: Other
ML0735310952007-12-10010 December 2007
Request for Extension to Complete the Final Confirmatory Testing, Analysis and Validation of Containment Sump Strainers Associated with NRC Generic Letter 2004-02
Project stage: Request
ML0807105462008-02-29029 February 2008
Palo Verde Nuclear Generating Station (Pvngs), Units 1, 2, and 3, Supplemental Response to NRC Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactor
Project stage: Request
ML0810801162008-04-10010 April 2008
Request for Amendment to Technical Specification 3.5.5, Refueling Water Tank (RWT) to Increase the RWT Minimum Water Level Under Exigent Circumstances
Project stage: Request
ML0812804952008-04-30030 April 2008
Response to Request for Additional Information Regarding Request for Amendment to Technical Specification 3.5.5, Refueling Water Tank (Rwt), to Increase the RWT Minimum Water Level Under Exigent Circumstances
Project stage: Response to RAI
ML0812700792008-05-0606 May 2008
Safety Evaluation for License Amendment Request, Change in Refueling Water Tank Level Requirement
Project stage: Approval
ML0812703052008-05-0909 May 2008
Issuance of Exigent Amendment No. 169 Revised Minimum Water Level for Technical Specification 3.5.5, Refueling Water Tank
Project stage: Approval
2008-04-10
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Category:Memoranda
MONTHYEARML24297A6392024-10-30030 October 2024
Reassignment of U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch IV
ML22147A0932022-06-0606 June 2022
2021 Annual Assessment Public Meeting Summary
ML21140A3892021-05-24024 May 2021
Riv Column 1 EOC 2020 Public Meeting Summary
ML21061A3202021-03-10010 March 2021
Summary of February 25, 2021, Public Meeting with Nuclear Energy Institute to Further Discuss the Inclusion of TSTF-425 Under the Risk-Informed Process for Evaluations Initiative
ML21006A3242021-01-0707 January 2021
Approval of the Risk-Informed Process for Evaluations
ML19120A1972019-04-26026 April 2019
Memo to File Environmental Assessment and Finding of No Significant Impact for Arizona Public Service Company'S Decommissioning Funding Plan Submitted in Accordance with 10 CFR 73.30(b) and 10 CFR 72.30(c) for Palo Verde ISFSI
ML18173A0082018-06-20020 June 2018
Cancelling Numerous Inspection Report Numbers
ML17128A4522017-05-0808 May 2017
Lessons Learned from Modeling the Flex Steam Generator Feed Pump for Palo Verde Nuclear Generating Station
ML17082A4462017-03-28028 March 2017
PVNGS Units 1, 2, and 3 Transition to CE 16x16 Ngf - Draft RAIs Rev 3
ML17027A2842017-01-27027 January 2017
Charter for the NRC Special Inspection Team at Palo Verde Nuclear Generating Station-Review of Licensee Actions Related to the Failure of the Unit 3 Train B Emergency Diesel Generator
ML17018A1232017-01-17017 January 2017
Management Directive 8.3 Evaluation for Palo Verde Unit 3 Emergency Diesel Generator Failure
ML17003A0832017-01-0303 January 2017
Safety Evaluation Input Regarding Changes to Technical Specifications for One-Time Extension of Completion Time for Emergency Diesel Generator
ML17004A2092017-01-0303 January 2017
Safety Evaluation Input for Palo Verde Nuclear Generating Station, Unit 3, Llcense Amendment Request for a One-Time Extension of the 3B Emergency Diesel Generator Completion Time
ML17003A3892017-01-0303 January 2017
Safety Evaluation Input Regarding the Palo Verde Nuclear Generating Station Unit 3 Emergency Request to Extend Diesel Generator 3B Completion Time
ML16358A4152016-12-23023 December 2016
Technical Specifications for One-Time Extension of Completion Time for Emergency Diesel Generator
ML16088A2042016-03-28028 March 2016
Memo T Bowers from s Ruffin, Technical Assistance Requests - Review 2015 Tri-Annual Decommissioning Funding Plans for Multiple Independent Spent Fuel Storage Installations W/ Encl 2 (Template)
ML16088A2052016-03-28028 March 2016
Enclosure 1 - (72.30 DFP Reviews to Be Completed 2015) - Memo T Bowers from s Ruffin, Technial Assistance Requests - Review 2015 Tri-Annual Decommissioning Funding Plans for Multiple Independent Spent Fuel Storage Installations
ML15205A3602015-07-24024 July 2015
Assessment of Cyber Security Program Draft Temporary Instruction (Ti) Performed at Palo Verde Nuclear Generating Station
ML15117A0422015-04-29029 April 2015
Memorandum to File Summarizing 4/24/15 Telephone Conference Granting Verbal Relief for Relief Request 53, Request for Approval of an Alternative to ASME Code, Section XI, Requirements for Flaw Removal
ML14115A0452014-06-25025 June 2014
Issuance of Amendment Nos. 193, 193, and 193, Adopt Technical Specification Task Force (TSTF)-500, Revision 2, DC Electrical Rewrite - Update to TSTF-360
ML13238A0352014-04-22022 April 2014
Memo from P. Lee to M. Markley Palo Verde RAI Memorandum
ML13330A5732013-12-0505 December 2013
Verbal Authorization of Relief Request 51, Alternative to ASME Code for Flaw Removal, Reactor Vessel Bottom-mounted Instrumentation Nozzle, Third 10-Year ISI Interval
ML13324A4942013-11-19019 November 2013
Deferral of Baseline Inspection Activities
ML13294A3732013-10-21021 October 2013
11/4/13 Notice of Meeting with Arizona Public Service Company to Discuss Non-destructive Examination Efforts, Repairs, and Progress on Root Cause Identified During Inspection of Bottom-Mounted Instrumentation Nozzles at Palo Verde, Unit 3
ML13281A2032013-10-0909 October 2013
11/5/2013 Notice of Preapplication Meeting to Discuss License Amendment Request to Incorporate Nuclear Energy Institute NEI-11-04 Quality Assurance Program at Palo Verde, Units 1, 2, and 3
ML13199A0082013-07-22022 July 2013
Meeting Notice with Arizona Public Service Company Low Pressure Safety Injection Pump Single Failure Analysis for Minimum Required Refueling Water Tank Transfer Volume at Palo Verde, Units 1, 2, and 3
ML13154A4832013-06-0404 June 2013
Rai'S Following Ifib Analysis of Ap'S 2013 Decommissioning Funding Status Report for Palo Verde Units 1, 2 and 3
ML13143A0892013-05-23023 May 2013
Meeting Notice with Arizona Public Service Company to Discuss the U.S. Nuclear Regulatory Commission (NRC) Staff'S Draft Request for Additional Information Relating to the February 28, 2013, Submittal
ML13105A0182013-05-16016 May 2013
Request for Additional Information Regarding APS Overall Integrated Plan in Response to Order EA-12-049
ML13127A2432013-05-0808 May 2013
5/29/13 Meeting Via Conference Call with Arizona Public Service Company to Discuss Palo Verde Request to Revise Technical Specifications; Eliminate Use of the Term Core Alteration Consistent w/TSTF-471 and NUREG-1432, Rev 3 (TAC ME8160-ME81
ML12227A8562012-08-17017 August 2012
Notice of Meeting with Arizona Public Service Company to Discuss Relief Request 48 - Alternative to ASME Section III, Phased Array Ultrasonic Examination Techniques for Palo Verde, Units 1, 2, and 3
ML12157A2722012-06-11011 June 2012
5/31/2012 Summary of Telephone Conference with Licensees Regarding Near Term Task Force Recommendation 2.1 Seismic Reevaluations - Diablo Canyon, 1 and 2, San Onofre, Units 2 and 3, Columbia Generating Station, and Palo Verde, Units 1, 2, a
ML1104604622011-02-15015 February 2011
Minutes Meeting of Palo Verde Nuclear Generating Station Units 1, 2, and 3 License Renewal Subcommittee, September 8, 2010, in Rockville, Maryland
ML1030105232010-11-16016 November 2010
Summary of Teleconference Held on Between the U.S. NRC and Arizona Public Service Company, Concerning Draft Follow-Up Request for Additional Information Pertaining to the Palo Verde Nuclear Generating Station, Units 1, 2 and 3, LRA
ML1029905302010-11-16016 November 2010
Summary of Telephone Conference Call Held on October 22, 2010, Btw the USNRC and Arizona Public Service Company, Concerning D-RAI Pertaining to the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, LRA
ML1030900182010-11-0505 November 2010
Notice of Meeting with Arizona Public Service Company to Discuss Palo Verde, Units 1, 2, and 3 License Amendment Request to Revise Technical Specification 3.7.4, Atmospheric Dump Valves.
ML1020305002010-10-15015 October 2010
Summary of Tele Conf Call Held on 7/21/10, Btw the USNRC and Arizona Public Service Company, Concerning Draft Request for Additional Information Pertaining to the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal App
ML1019401422010-10-15015 October 2010
July 8, 2010, Summary of Telephone Conference Call Held Between USNRC and Arizona Public Service Company Concerning D-RAI Pertaining to the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application
ML1027801622010-10-13013 October 2010
9/15/10 Summary of Public Meeting to Discuss the Draft Supplemental Environmental Impact Statement for Palo Verde Nuclear Generating Station
ML1028003402010-10-13013 October 2010
Final Response to Task Interface Agreement - Requirements for Degraded Voltage Relay Setpoints at Palo Verde Nuclear Generating Station (TIA 2010-005
ML1024303382010-10-0505 October 2010
Letter Summary of Telephone Conference Call Held on 8/31/10 Btw the USNRC and Arizona Public Service Company, Concerning Draft Request for Additional Information Pertaining to the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, Lr
ML1023102542010-08-24024 August 2010
Forthcoming Meeting to Discuss the Draft Supplemental Environmental Impact Statement (Dseis) for Palo Verde Nuclear Generating Station
ML1021606502010-08-0909 August 2010
Transmittal Letter Advisory Committee on Reactor Safeguards Review of the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application - Safety Evaluation Report
ML1017600272010-07-19019 July 2010
Summary of Telecon Calls Held on May 5, May 19, and June 16, 2010 Between the USNRC and Arizona Public Service Company, Concerning D-RAI Pertaining to the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application
ML1013407042010-06-0202 June 2010
License Renewal, May 14, 2010 Conference Call Summary
ML1013302522010-06-0202 June 2010
4-13-2010, Telecon Summary Re Draft Request for Additional Information Pertaining to the License Renewal Application
ML1013302862010-06-0202 June 2010
04/23/10 Summary of Telepone Conference Call Held Between NRC and Arizona Public Service Co., Concerning Palo Verde, Units 1, 2 & 3 License Renewal Application
ML1013406662010-06-0202 June 2010
Summary of Tele Conf Call Held on 4/12/10, Btw the USNRC and APS, Concerning the PVNGS, Units 1, 2, and 3, License Renewal Application
ML1013407882010-06-0202 June 2010
Summary of Tele Conf Call Held on 4/14/10, Btw USNRC and APS, Concerning D-RAI Pertaining to the PVNGS, Units 1,2 and 3, License Renewal Application
ML1010606402010-04-27027 April 2010
Summary of Tele Conference Call Held on 4/9/10, Btw the USNRC and Arizona Public Service Company, Concerning Draft Requests for Additional Information Pertaining to the Palo Verde Nuclear Generating Station, Units 1,2, and 3, License Renewa
2024-10-30
[Table view] |
Text
May 6, 2008 MEMORANDUM TO: Thomas G. Hiltz, Chief Plant Licensing Branch IV Division of Operating Reactor Licensing FROM: Gregory Cranston, Chief /RA/ for Samuel Miranda Reactor Systems Branch Division of Systems Safety
SUBJECT:
SAFETY EVALUATION FOR LICENSE AMENDMENT REQUEST, CHANGE IN REFUELING WATER TANK LEVEL REQUIREMENT Plant Name: Palo Verde Nuclear Generating Station (PVNGS)
Utility: Arizona Public Service Company (APS)
TAC Nos: MD8496 Docket Nos: 50-529 License Nos: NPF-51 Plant Licensing Branch: IV Project Manager: Michael T. Markley Review Branch: DSS/SRXB Review Status: Complete By application dated April 10, 2008, the licensee, Arizona Public Service Company, requested changes to the Facility Operating Licenses and Technical Specifications (TSs) for the Palo Verde Nuclear Generating Station, Unit 2, that would modify TS 3.5.5 to increase the minimum required Refueling Water Tank (RWT) water volumes, in TS Figure 3.5.5-1, by 3%. The additional water volume, available in the RWT and subsequently in the containment sumps, would provide assurance that the engineered safety feature pumps and the containment recirculation sump strainers will meet their intended design functions during loss of coolant accidents (LOCAs).
The SRXB staff has reviewed the information submitted on April 10, 2008, and found that it is sufficient to justify the proposed changes to the PVNGS2 TSs. The details of the review, and results are discussed in the attached safety evaluation.
Enclosure:
As stated CONTACT: Samuel Miranda, SXRB/DSS (301) 415-2303
May 6, 2008 MEMORANDUM TO: Thomas G. Hiltz, Chief Plant Licensing Branch IV Division of Operating Reactor Licensing FROM: Gregory Cranston, Chief /RA/ for Samuel Miranda Reactor Systems Branch Division of Systems Safety
SUBJECT:
SAFETY EVALUATION FOR LICENSE AMENDMENT REQUEST, CHANGE IN REFUELING WATER TANK LEVEL REQUIREMENT Plant Name: Palo Verde Nuclear Generating Station (PVNGS)
Utility: Arizona Public Service Company (APS)
TAC Nos: MD8496 Docket Nos: 50-529 License Nos: NPF-51 Plant Licensing Branch: IV Project Manager: Michael T. Markley Review Branch: DSS/SRXB Review Status: Complete By application dated April 10, 2008, the licensee, Arizona Public Service Company, requested changes to the Facility Operating Licenses and Technical Specifications (TSs) for the Palo Verde Nuclear Generating Station, Unit 2, that would modify TS 3.5.5 to increase the minimum required Refueling Water Tank (RWT) water volumes, in TS Figure 3.5.5-1, by 3%. The additional water volume, available in the RWT and subsequently in the containment sumps, would provide assurance that the engineered safety feature pumps and the containment recirculation sump strainers will meet their intended design functions during loss of coolant accidents (LOCAs).
The SRXB staff has reviewed the information submitted on April 10, 2008, and found that it is sufficient to justify the proposed changes to the PVNGS2 TSs. The details of the review, and results are discussed in the attached safety evaluation.
Enclosure:
As stated CONTACT: Samuel Miranda, SXRB/DSS (301) 415-2303 DISTRIBUTION: NRR/DSS ADAMS: ML081270066 OFFICE SXRB/DSS SXRB/DSS NAME S Miranda G Cranston /RA/ for Samuel Miranda DATE 5/6/08 5/6/08 OFFICIAL RECORD COPY
SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO FACILITY OPERATING LICENSE No. NPF-51 ARIZONA PUBLIC SERVICE COMPANY PALO VERDE NUCLEAR GENERATING STATION, UNIT 2 CHANGE IN REFUELING WATER TANK LEVEL REQUIREMENT DOCKET NO. 50-529
1.0 INTRODUCTION
By application dated April 10, 2008 [1], the licensee, Arizona Public Service Company (APS),
requested changes to the Facility Operating Licenses and Technical Specifications (TSs) for the Palo Verde Nuclear Generating Station, Unit 2 (PVNGS2), that would modify TS 3.5.5 to increase the minimum required Refueling Water Tank (RWT) water volumes, in TS Figure 3.5.5-1, by 3%. The additional water volume, available in the RWT and subsequently in the containment sumps, would provide assurance that the engineered safety feature (ESF) pumps and the containment recirculation sump strainers will meet their intended design functions during loss of coolant accidents (LOCAs).
The proposed change stems from APS reevaluation of PVNGS2's containment flooding calculations, which were performed to respond to a generic letter [2] from the NRC staff. APS identified a more limiting LOCA scenario that was not considered when the current TS minimum RWT levels, depicted in TS Figure 3.5.5-1, were determined. In this LOCA scenario, the strainers would not necessarily be fully submerged, post-LOCA, at the time the recirculation actuation signal (RAS) is generated. Therefore, APS has proposed to raise the RWT minimum level, in PVNGS2, to 3% above the current TS Figure 3.5.5-1 levels.
2.0 REGULATORY EVALUATION
The TS minimum RWT levels, depicted in TS Figure 3.5.5-1, the ESF pumps, and the containment recirculation sump strainers, operating in accordance with the RAS, deliver to the reactor vessel, in order to cool the core, in postulated LOCA scenarios. They act as, a structure, system, or component that is part of the primary success path and which functions or actuates to mitigate a design basis accident or transient that either assumes the failure of or presents a challenge to the integrity of a fission product barrier. Thus, they satisfy Criterion 3 of 10 CFR 50.36(c)(2)(ii)(C).
3.0 TECHNICAL EVALUATION
APS containment flooding calculation validation efforts, conducted in response to Generic Letter 2004-02 [2], revealed a LOCA break scenario that requires more water, in the RWT, than that shown in the current TS minimum RWT levels of TS Figure 3.5.5-1, to assure that the strainers become fully submerged, post-LOCA, at the time the RAS is generated. This LOCA scenario postulates a small break at the top of the pressurizer. This break size and location ENCLOSURE
results in less spillage to the containment floor, since the reactor coolant system (RCS) pressure does not drop to a level that permits water from the safety injection tanks (SITs) to enter the RCS. In this LOCA scenario, water from the SITs does not flow into the RCS, and eventually into the containment sump. Water from the SITs cannot help to flood the strainers.
According to the PVNGS UFSAR [3], about 7,656 ft3 (or 57,300 gallons) of water would remain in the SITs.
The licensee has determined that the minimum flood level requires the transfer of 543,200 gallons of water from the RWT to the RCS (and eventually to the containment sump) prior to receipt of the RAS. The licensee has also that, in order to make this amount of water available, the RWT level would have to indicate 83% of scale, an increase of 3% ove rthe current value.
The proposed increase amounts to about 24,000 gallons of water, a significant portion of the SIT inventory that does not become available during a small break LOCA.
The SRXB staff concludes that the licensee has demonstrated that their proposal, to increase the minimum required RWT water volumes, in TS Figure 3.5.5-1, by 3%, would continue to satisfy the analysis acceptance criteria for the affected licensing basis events (e.g., the LOCA events). Therefore, the licensees proposal is consistent with their no significant hazards consideration, and in accordance with the terms of 10 CFR 50.92 (c).
4.0 STATE CONSULTATION
The PM is responsible for contacting the state official and verifying that this statement is correct.
In accordance with the Commissions regulations, the [Name of State] State official was notified of the proposed issuance of the amendment. The State official had [no] comments. [If comments were provided, they should be addressed here].
5.0 ENVIRONMENTAL CONSIDERATION
Caution: The environmental consideration discussed below is written for a categorical exclusion based on 10 CFR 51.22(c)(9). The PM/LA are responsible to ensure that this is accurate for the specific amendment being issued.
The amendments change a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20. The NRC staff has determined that the amendments involve no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant increase in individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that the amendments involve no significant hazards consideration, and there has been no public comment on such finding (XX FR XXXX). Accordingly, the amendments meet the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9). Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendments.
6.0 CONCLUSION
The Commission has concluded, based on the considerations discussed above, that: (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commissions regulations, and (3) the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor: S. Miranda Date: May 5, 2008
7.0 REFERENCES
[1] 102-05844-DCM/GAM, Request for Amendment to Technical Specification 3.5.5, Refueling Water Tank (RWT), to Increase the RWT Minimum Water Level for Unit 2 Under Exigent Circumstances, Arizona Public service Company, April 10, 2008
[2] NRC Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents At Pressurized-Water Reactors, September 13, 2004 and Palo Verde Nuclear Generating Station letter to NRC, Response to NRC Request for Additional Information Related to Generic Letter 2004 -02 , Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors, dated February 29, 2008 (ADAMS Accession No. ML080710546)
[3] Table 6.2.1-6A, Updated Final Safety Analysis Report for Palo Verde Nuclear Generating Station, Rev 14 Principal Contributor: S. Miranda, Date: May 8, 2008
