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| | issue date = 07/15/2010 | | | issue date = 07/15/2010 |
| | title = Request for Additional Information, Round 3, Amendment Request to Revise Technical Specification 3.8.7, Inverters - Operating, to Extend Completion Time for Restoration of an Inoperable Inverter (TAC ME2337-ME2339) | | | title = Request for Additional Information, Round 3, Amendment Request to Revise Technical Specification 3.8.7, Inverters - Operating, to Extend Completion Time for Restoration of an Inoperable Inverter (TAC ME2337-ME2339) |
| | author name = Hall J R | | | author name = Hall J |
| | author affiliation = NRC/NRR/DORL/LPLIV | | | author affiliation = NRC/NRR/DORL/LPLIV |
| | addressee name = Stroud R M | | | addressee name = Stroud R |
| | addressee affiliation = Arizona Public Service Co | | | addressee affiliation = Arizona Public Service Co |
| | docket = 05000528, 05000529, 05000530 | | | docket = 05000528, 05000529, 05000530 |
Revision as of 07:33, 11 July 2019
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MONTHYEARML0928102272009-09-28028 September 2009 Request to Amend Technical Specification (TS) 3.8.7, Inverters - Operating, to Extend Completion Time for Restoration of an Inoperable Inverter Project stage: Request ML1010308972010-04-13013 April 2010 Draft Request for Additional Information, License Amendment Request Technical Specification 3.8.7, Inverters Completion Times Project stage: Draft RAI ML1011004572010-04-20020 April 2010 Draft Request for Additional Information, LAR, Technical Specification 3.8.7 Inverter Completion Times Project stage: Draft RAI ML1018802632010-06-24024 June 2010 Request for Additional Information Response on Request to Amend Technical Specification 3.8.7, Inverters - Operating, to Extend Completion Time for Restoration of an Inoperable Inverter Project stage: Request ML1020004912010-07-15015 July 2010 Request for Additional Information, Round 3, Amendment Request to Revise Technical Specification 3.8.7, Inverters - Operating, to Extend Completion Time for Restoration of an Inoperable Inverter (TAC ME2337-ME2339) Project stage: RAI ML1025713982010-09-0303 September 2010 Response to Second Request for Additional Information Request to Amend Technical Specification (TS) 3.8.7, Inverters Operating, to Extend Completion Time for Restoration of an Inoperable Inverter Project stage: Request ML1027204812010-09-24024 September 2010 Response to Electrical Branch Request for Additional Information - Request to Amend Technical Specification 3.8.7, Inverters - Operating, to Extend Completion Time for Restoration of an Inoperable Inverter Project stage: Request 2010-06-24
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Category:Request for Additional Information (RAI)
MONTHYEARML24011A1002024-01-10010 January 2024 March 2024 Emergency Preparedness Program Inspection - Request for Information ML23334A1612023-11-30030 November 2023 NRR E-mail Capture - Palo Verde 1, 2, and 3 - RAIs Associated with License Renewal Commitment for Pressurizer Surge Line Welds Inspection Program to Manage Environmentally Assisted Fatigue ML23334A0072023-11-29029 November 2023 NRR E-mail Capture - Palo Verde 1, 2, and 3 - Official RAIs for LAR That Revises TSs 3.5.1, SITs - Operating; 3.5.2, SIT Shutdown; 3.6.5, Containment Air Temperature; and SRs for TS 3.5.1, SITs Operating ML23298A1232023-10-25025 October 2023 NRR E-mail Capture - Palo Verde, Unit 1 - RAIs for Relief Request 70, Proposed Alternatives for Pressurizer Lower Shell Temperature Nozzle ML23031A3392023-01-31031 January 2023 In-service Inspection Request for Information ML23013A0632023-01-13013 January 2023 NRR E-mail Capture - Palo Verde Unit 1 -Request for Additional Information - U1R23 Inspection Summary Report for Steam Generator Tubing ML22348A1672022-12-14014 December 2022 March 2023 Emergency Preparedness Exercise Inspection - Request for Information ML22339A2372022-12-0505 December 2022 NRR E-mail Capture - Palo Verde Unit 1 Request for Additional Information - U1R23 Inspection Summary Report for Steam Generator Tubing ML22272A3252022-09-29029 September 2022 Licensed Operator Positive Fitness-For-Duty Test Request for Additional Information ML22209A1752022-07-28028 July 2022 Inservice Inspection Request for Information ML22187A2632022-07-0606 July 2022 Notification of Inspection (NRC IR 05000528/2022004, 05000529/2022004 and 05000530/2022004) and Request for Information ML22067A2292022-03-0202 March 2022 Inservice Inspection Inspection PWR Request for Information ML22055A5842022-02-24024 February 2022 NRR E-mail Capture - Palo Verde, Unit 3 - Final RAIs for 22nd Refueling Outage (Spring 2021) Steam Generator Tube Inservice Inspection Report ML22035A3302022-02-10010 February 2022 Requests for Confirmation of Information for Exemption to Delete Diverse Auxiliary Feedwater Actuation System Based on Risk-Informed Process for Evaluations ML22025A4012022-01-0303 January 2022 March 2022 Emergency Preparedness Program Inspection - Request for Information ML21245A2222021-09-0101 September 2021 Request for Information ML21200A2392021-07-20020 July 2021 Docs Request AC - AA August 2021 ML21154A0082021-05-26026 May 2021 NRR E-mail Capture - Palo Verde 1, 2 and 3 - Official RAIs for LAR Associated with Permanent Extension of Containment ILRT Frequency to 15 Years (Type a) and CIV Leak Rate Test Frequency to 75 Months (Type C) ML21064A2372021-03-0303 March 2021 ISI Request for Information Rls ML21042B9692021-02-18018 February 2021 Notification of NRC Design Bases Assurance Inspection and Initial Request for Information ML21043A1462021-02-11011 February 2021 NRR E-mail Capture - Palo Verde 1, 2, and 3 - Official RAI for an Order Associated with Indirect License Transfer from Public Service Company of New Mexico to Avangrid, Inc ML21023A0212021-01-13013 January 2021 PVNGS PI&R Request for Information RA ML21011A1972021-01-12012 January 2021 Unit 2, and Unit 3 - Notification of an NRC Fire Protection Baseline Inspection (NRC Inspection Report 05000528/2021012, 05000529/2021012 and 05000530/2021012) and Request for Information ML20227A0992020-08-14014 August 2020 Licensed Operator Positive Fitness-For-Duty Test Request for Additional Information ML20118D1362020-04-28028 April 2020 Licensed Operator Positive Fitness-For-Duty Test Request for Additional Information ML20049A0992020-02-14014 February 2020 Notification of Cyber Security Inspection (NRC Inspection Report 05000528/2020401; 05000529/2020401; and 05000530/2020401) and Request for Information ML20049A0252020-02-12012 February 2020 NRR E-mail Capture - Palo Verde Nuclear Generating Station, Unit 1 - Official RAIs for License Amendment Request Associated with Changes to Emergency Plan Staffing Requirements ML20021A3172020-01-21021 January 2020 NRR E-mail Capture - Palo Verde Nuclear Generating Station, Unit 1 - Official RAIs for Relief Request 64, Impractical Examinations for the Third 10-Year ISI Interval ML19317D0782019-11-13013 November 2019 NRR E-mail Capture - Palo Verde 1 - Requests for Additional Information on Unit 1 21st Refueling Outage Steam Generator Tube Inspection Report ML19234A3202019-08-29029 August 2019 Redacted - Request for Additional Information for Amendment and Exemption Request to Support the Implementation of Framatome High Thermal Performance Fuel (EPID L-2018-LLA-0194; EPID L-2018-LLE-0010) ML19155A1842019-05-30030 May 2019 NRR E-mail Capture - Palo Verde Nuclear Generating Station, Unit 3 - Mvib Official RAIs for RR-63, Impractical Examinations for the Third 10-Year ISI Interval ML19095A6552019-04-0404 April 2019 NRR E-mail Capture - Palo Verde Nuclear Generating Station, Unit 3 - Mphb Official RAIs for RR-63, Impractical Examinations for the Third 10-Year ISI Interval ML19044A7342019-02-13013 February 2019 NRR E-mail Capture - Palo Verde1, 2, and 3 - Official Requests for Additional Information for RR 62, Third and Fourth 10-Year ISI Intervals, Proposed Alternative - Pressurizer Heat Sleeve Repairs ML19008A3612019-01-0808 January 2019 NRR E-mail Capture - Palo Verde 1, 2, and 3 - Official RAIs for LAR Associated with Response Time Testing of Pressure Transmitters ML18341A0252018-12-0303 December 2018 Notification of NRC Design Bases Assurance Inspection (Teams)(05000528/2019011, 05000529/2019011, and 05000530/2019011) and Initial Request for Information ML18271A0392018-10-0202 October 2018 Non Proprietary - Supplemental Information Needed for Acceptance of Requested License Amendments and Exemptions Implementation of Framatome High Thermal Performance Fuel (Epids L-2018-LLA-0194 and L-2018-LLE-0010) ML18221A5102018-08-23023 August 2018 Request for Additional Information License Amendment Request to Adopt Risk-Informed Completion Times (CAC Nos. MF6576, MF6577, and MF6578; EPID: L-2015-LLA-0001) ML18229A3132018-08-17017 August 2018 NRR E-mail Capture - Request for Additional Information Relief Request 58: Impractical Examinations for the Third 10-Year Inservice Inspection Interval Arizona Public Service Company Palo Verde Nuclear Generation Station, Unit 2 - Second Se ML18227A8672018-08-15015 August 2018 NRR E-mail Capture - Request for Additional Information Relief Request 58: Impractical Examinations for the Third 10-Year Inservice Inspection Interval Arizona Public Service Company Palo Verde Nuclear Generation Station, Unit 2 ML18124A0112018-05-0303 May 2018 NRR E-mail Capture - Palo Verde 1, 2, and 3 - Official Eeob RAIs for TSTF-505 (4b) LAR (CAC Nos. MF6576, MF6577, and MF6578; EPID L-2015-LLA-0001) ML18099A0072018-04-0606 April 2018 NRR E-mail Capture - Palo Verde 1, 2, and 3 - Official RAIs for 10 CFR 50.69 LAR (CAC Nos. MF9971, MF9972, and MF9973; EPID L-2017-LLA-0276) ML18094B1122018-04-0404 April 2018 NRR E-mail Capture - Palo Verde 1, 2, and 3 - Final RAIs for TSTF-505 (Initiative 4b) LAR (CAC Nos. MF6576, MF6577, and MF6578: EPID L-2015-LLA-0001) ML18066A7032018-03-0707 March 2018 Notification of Nrc Design Bases Assurance Inspection (Programs) 05000528/2018011, 05000529/2018011, and 05000530/2018011 Initial Request for Information ML17248A0162017-08-31031 August 2017 NRR E-mail Capture - Palo Verde 1, 2, and 3 - Final RAI for RRs PRR-03, PRR-04 and PRR-05, Pump Testing ML17107A0052017-04-14014 April 2017 NRR E-mail Capture - Palo Verde 1, 2, and 3 - Ngf LAR and Exemption RAIs (CAC Nos. MF8076 to MF8081) ML17082A4462017-03-28028 March 2017 PVNGS Units 1, 2, and 3 Transition to CE 16x16 Ngf - Draft RAIs Rev 3 ML17003A0182017-01-0202 January 2017 NRR E-mail Capture - Palo Verde, Unit 3 - Draft RAIs for the Second Emergency LAR Associated with EDG 3B Failure ML16258A0312016-09-14014 September 2016 PVNGS Units 1-3 - Notif of NRC Insp of the Implementation of Mitigation Strategies and Spent Fuel Pool Instr. Orders and Emer. Prep. Comm./Staffing/Multi-Unit Dose Assessment Plns(05000528/ 2016009;05000529/2016009;and 05000530/2016009) and ML16111B3312016-04-20020 April 2016 Notification of NRC Component Design Bases Inspection (05000528/2016007; 05000529/2016007; 05000530/2016007) and Initial Request for Information ML16083A2502016-03-23023 March 2016 NRR E-mail Capture - Palo Verde Nuclear Generating Station, Units 1, 2, and 3 - Official RAIs for EAL LAR 2024-01-10
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ADDITIONAL NRC STAFF QUESTIONS AND COMMENTS PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 TAC NOS. ME2337, ME2338, AND ME2339 By letter dated September 28, 2009, Arizona Public Service Company (APS) submitted a license amendment request (LAR) for the Palo Verde Nuclear Generating Station (PVNGS), Units 1, 2, and 3. The proposed amendment would revise Required Action A.1 of Technical Specification 3.8.7, "Inverters - Operating," for PVNGS by extending the Completion Time for restoration of an inoperable vital alternating current inverter from 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to 7 days. The U.S.
Nuclear Regulatory Commission (NRC) staff reviewed the LAR and issued a draft Request for Additional Information (RAI), communicated to you via e-mail on April 13, 2010 (as corrected April 20, 2010). APS responded to the RAI by letter dated June 24, 2010. The staff has reviewed that response and needs further clarification on a couple of issues to complete its evaluation. The additional clarifying questions and comments based on the June 24, 2010, APS response are provided below.
PRA RAI 3c (spurious component operations in the fire PRA model)
The response to this question states that potential spurious operation of components was analyzed, but does not provide any further details as to the scope of this review, criteria applied, results, etc. (It was instead stated that spurious operations are not significant to plants with hot standby end states - the staff does not agree). The staff needs to understand more specifically how this aspect of the PVNGS fire PRA modeling was addressed. The licensee needs to provide additional information on how it identified and evaluated spurious operations for its PRA analyses supporting this application, and what spurious operations have been included in the fire PRA model.
PRA RAI 14 (tier 2 requirements in the TS Bases)
In the license amendment request section 3.4.5 for evaluation of tier 2 requirements, it is stated that "there is reasonable assurance that risk-significant plant equipment configurations will not occur-This conclusion is based on implementation of specific compensatory measures-". The staff interprets these statements to mean that if these compensatory measures on equipment availability are not implemented, then a risk-significant configuration could occur.
The response to question 14 includes the statement: "the Technical Specification Bases statements describe prudent administrative controls, which do not restrict application of Technical Specification 3.8.7, Action A.1." If the statements in the TS Bases have no impact on the application of the proposed extended CT, then it is unclear to the staff how the tier 2 restrictions, identified by the licensee as required to reach the conclusion that "there is reasonable assurance that risk-significant plant equipment configurations will not occur-",
achieve their intended purpose.
It is also not clear to the staff why planned outages of diesel generators and instrumentation channels must be prohibited in order to avoid a risk-significant configuration, but unplanned outages need not be prohibited.
The licensee needs to clarify whether a risk-significant configuration can occur due to simultaneous unavailability of an inverter with either a diesel generator or instrumentation channel, and if so, to propose a tier 2 control which does assure the TS action is not applied under those conditions for either planned or unplanned unavailabilities. Further, if the control is not to be a note in the TS required action (this is the staff's preferred implementation method), then the licensee will need to justify why the restriction should not be in the TS action, include a specific regulatory commitment on the docket, and identify how the restrictions on equipment operability are implemented. For a permanent TS change, if it is essential to restrict unavailability of other TS components, then including such requirements in the TS Bases is not considered acceptable.