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MONTHYEARML1127900622011-10-0505 October 2011 Request for Additional Information Email, License Amendment Request to Revise Licensing Basis to Discuss Conformance of Delayed Access Offsite Power Circuit to GDC 17 Project stage: RAI ML12354A5392012-12-20020 December 2012 1/24/2013 - Notice of Meeting with Pacific Gas and Electric to Discuss Diablo Canyon, Units 1 and 2 License Amendment Request to Revise FSAR Update Related to Delayed Access Offsite Power Circuit to Conform with GDC 17 Project stage: Meeting ML13024A4052013-01-24024 January 2013 Licensee Slides from 1/24/13 Meeting to Discuss Offsite Power Project stage: Request ML13028A1822013-02-0707 February 2013 1/24/2013 - Summary of Meeting with Pacific Gas and Electric to Discuss Diablo Canyon, Units 1 and 2 License Amendment Request to Revise FSAR Update Related to Delayed Access Offsite Power Circuit to Conform with GDC 17 Project stage: Meeting DCL-13-025, Withdrawal of License Amendment Request 09-07, Delayed Access Offsite Power Circuit Conformance with GDC 172013-03-14014 March 2013 Withdrawal of License Amendment Request 09-07, Delayed Access Offsite Power Circuit Conformance with GDC 17 Project stage: Withdrawal ML13122A3222013-05-13013 May 2013 FRN, Withdrawal of License Amendment Request to Revise Final Safety Analysis Report Update Related to Delayed Access Offsite Power Circuit to Conform with General Design Criteria 17 Project stage: Withdrawal ML13122A3202013-05-13013 May 2013 Letter, Withdrawal of License Amendment Request to Revise Final Safety Analysis Report Update Related to Delayed Access Offsite Power Circuit to Conform with General Design Criteria 17 Project stage: Withdrawal NRC-2013-0100, FRN, Withdrawal of License Amendment Request to Revise Final Safety Analysis Report Update Related to Delayed Access Offsite Power Circuit to Conform with General Design Criteria 17 (TAC Nos. ME3018 and ME3019)2013-05-13013 May 2013 FRN, Withdrawal of License Amendment Request to Revise Final Safety Analysis Report Update Related to Delayed Access Offsite Power Circuit to Conform with General Design Criteria 17 (TAC Nos. ME3018 and ME3019) Project stage: Withdrawal 2013-01-24
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Category:E-Mail
MONTHYEARML24250A0542024-09-0606 September 2024 LRA - Requests for Additional Information - Set 1 - Email from Brian Harris to Adam Peck ML24235A2032024-08-22022 August 2024 OEDO-24-00083 - 10 CFR 2.206 - Diablo Canyon Units 1 and 2 Seismic - Final Determination e-mail - EPID L-2024-CRS-0000 ML24205A0622024-07-23023 July 2024 NRR E-mail Capture - Acceptance Review - Diablo Canyon Request for Approval to Extend the Alternative for Use of Full Structural Weld Overlay ML24187A1382024-07-0202 July 2024 License Renewal Environmental Review: Summary of June 27 Clarification Call Regarding Pg&Es Response to RCI AQN-3 ML24184C0422024-07-0202 July 2024 NRR E-mail Capture - Request for Additional Information Diablo Canyon 50.69 risk-informed Categorization ML24149A0832024-05-28028 May 2024 Acceptance Review: Diablo Canyon Request for Alternative Security Measures and Exemption for the Early Warning System ML24145A0612024-05-22022 May 2024 Written Limited Appearance Statement of Doris Nassiry ML24136A1622024-05-15015 May 2024 OEDO-24-00083 (E-Mail) 10 CFR 2.206 - Diablo Canyon Power Plant, Unit Nos. 1 and 2 Seismic - Initial Assessment ML24134A1902024-05-10010 May 2024 Written Limited Appearance Statement of Shelley Hamilton ML24134A1872024-05-10010 May 2024 Written Limited Appearance Statement of Charlene M. Woodcock ML24122C6702024-04-29029 April 2024 Request from NRC Review of a Draft EA for an Exemption for the Limerick Generating Station ML24095A3172024-04-0404 April 2024 NRR E-mail Capture - Acceptance Review Diablo Canyon Request to Revise Technical Specification 5.6.6 for Pressure and Temperature Limits Report ML24088A2382024-03-28028 March 2024 10 CFR 2.206 - Diablo Canyon Units 1 and 2 OEDO-24-00083 - Screen-in e-mail L-2024-CRS-0000 ML24058A1032024-03-0808 March 2024 OEDO-23-00350-NRR - Initial Assessment - 10 CFR 2.206 Petition from Mothers for Peace and Friends of the Earth Regarding Diablo Canyon ML24071A1762024-03-0707 March 2024 Email - (External Sender) NRC Proceeding on Diablo Canyon 50-275 and 50-323 LR-2 ML24067A0902024-03-0505 March 2024 Email to Diane Curran from the Office of the Secretary, Assistant for Rulemaking and Adjudications, Russell Chazell ML24067A0892024-03-0505 March 2024 Email Response from Diane Curran to Office of the Secretary, Assistant for Rulemaking and Adjudications, Russell Chazell ML24067A0882024-03-0404 March 2024 Email Hearing Request from San Luis Obispo Mothers for Peace, Friends of the Earth, and Environmental Working Group ML24060A0022024-02-28028 February 2024 (External Sender) Pre-Sub Mittal EWS Participants List E-mail ML24045A1972024-02-0606 February 2024 Tribal Consultation Request ML24033A3062024-02-0101 February 2024 Dcisc 2-1-2024 Email: Comments by Mr. Bruce Severance at This Mornings Public Meeting Re Scope of Review for DCPP License Extension ML23334A0912023-11-30030 November 2023 NRR E-mail Capture - Diablo Canyon 1 and 2 - Audit Questions for License Amendment Associated with TSTF-505, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b ML23335A1012023-11-0606 November 2023 OEDO-23-00350-NRR - Screen-in Email - 10 CFR 2.206 Petition from Mother'S for Peace and Change.Org Regarding Diablo Canyon ML23306A0422023-11-0202 November 2023 NRR E-mail Capture - Acceptance Review Diablo Canyon Request to Adopt 10 CFR 50.69, risk-informed Categorization and Treatment of SSCs ML23230A0702023-08-18018 August 2023 NRR E-mail Capture - Acceptance Review - Diablo Canyon Request to Revise Technical Specifications to Adopt TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times RITSTF Initiative 4b ML23165A2702023-06-14014 June 2023 NRR E-mail Capture - Acceptance Review - Diablo Canyon Revision to the Unit 1 Reactor Vessel Material Surveillance Program Withdrawal Schedule ML23157A2392023-06-0505 June 2023 Limited Appearance Statement from Nina Babiarz in the Matter of the Diablo Canyon ISFSI License Renewal Application ML23096A1792023-04-0606 April 2023 NRR E-mail Capture - Request for Additional Information Diablo Canyon Exemption Request Regarding Senior Reactor Operator License Application ML23094A1032023-04-0404 April 2023 NRR E-mail Capture - Acceptance Review - Diablo Canyon Exemption Request Regarding Senior Reactor Operator License Application ML23076A0932023-03-16016 March 2023 16-2023 Email - Estimate of Spent Nuclear Fuel in Tons ML23067A0202023-03-0808 March 2023 NRR E-mail Capture - Diablo Canyon Nuclear Power Plant Evacuation Time Estimate Analysis Review ML23046A1042023-02-13013 February 2023 Transmittal Email, Diane Curran to Gibson, 2/13/23, Filing of Formal Opposition to PG&E Exemption Request ML23046A1132023-02-13013 February 2023 Transmittal Email, Paul Bessette to Gibson, 2/13/23, Filing of Formal Opposition to PG&E Exemption Request ML23052A2042023-01-10010 January 2023 E-mail from Paul Bessette Dated 01/10/2023 Regarding Diablo Canyon ML22326A1632022-11-21021 November 2022 Licensee Comment Email on Post-Shutdown Emergency Plan Amendment ML22266A0012022-09-22022 September 2022 (External Sender) E-Mail Diablo Canyon Power Plant, Unit Nos. 1 and 2 - Total Amount of Spent Nuclear Fuel Stored in Tons ML22241A1142022-08-29029 August 2022 NRR E-mail Capture - Acceptance Review - Diablo Canyon Application to Revise Technical Specifications to Adopt TSTF-569, Revision of Response Time Testing Definitions ML22194A8872022-07-11011 July 2022 September 2022 Emergency Preparedness Exercise Inspection - Request for Information Email ML22187A2652022-07-0606 July 2022 NRR E-mail Capture - Request for Additional Information: Diablo Canyon Exemption Request for Part 73 force-on-force Training Due to COVID-19 ML22105A0702022-04-15015 April 2022 NRR E-mail Capture - Acceptance Review - Diablo Canyon Request to Revise Technical Specifications to Adopt TSTF 577, Revised Frequencies for Steam Generator Tube Inspections ML22090A0832022-03-31031 March 2022 NRR E-mail Capture - Acceptance Review - Diablo Canyon Request for Approval of a Certified Fuel Handler Training and Retraining Program ML22089A1672022-03-29029 March 2022 Email - Acknowledgement of NRC Receipt of Diablo Canyon ISFSI Renewal Application ML22087A0412022-03-25025 March 2022 NRR E-mail Capture - Acceptance Review - Diablo Canyon Request for Approval of Alternative Security Measures for Early Warning System ML22061A2192022-03-0202 March 2022 NRR E-mail Capture - Request for Additional Information - Diablo Canyon Proposed Changes to Emergency Plan for post-shutdown and Permanently Defueled Condition ML21323A0652021-11-19019 November 2021 NRR E-mail Capture - Acceptance Review - Diablo Canyon Revision of Emergency Plan for post-shutdown Condition ML21264A6722021-09-21021 September 2021 NRR E-mail Capture - Revised Schedule: Diablo Canyon Request to Revise Technical Specification to Reflect the Permanent Cessation of Reactor Operation ML21215A3432021-08-0303 August 2021 NRR E-mail Capture - Request for Additional Information - Diablo Canyon Request to Revise Technical Specification 3.8.1, AC Sources - Operating to Support Diesel Fuel Oil Transfer System Component Planned Maintenance ML21188A0382021-07-0707 July 2021 (External_Sender) DCPP Draft Emergency LAR - Asw ML21189A0662021-07-0707 July 2021 NRR E-mail Capture - Additional Draft Request for Additional Information - Diablo Canyon Emergency Amendment Request to Revise Technical Specification 3.7.8, Auxiliary Saltwater (Asw) System DCL-21-046, Email for Emergency LAR for TS 3.7.8, Auxiliary Saltwater (Asw) System2021-07-0707 July 2021 Email for Emergency LAR for TS 3.7.8, Auxiliary Saltwater (Asw) System 2024-09-06
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Text
From: Wang, Alan Sent: Wednesday, October 05, 2011 3:54 PM To: Baldwin, Thomas (DCPP); Soenen, Philippe R Cc: Polickoski, James; Lent, Susan; Burkhardt, Janet
Subject:
Diablo Canyon Power Plant License Amendment Request Regarding GDC-17 (ME3018 And ME3019)
Philippe and Tom, By application dated December 29, 2009 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML100040087), Pacific Gas and Electric company (PG&E, the licensee), requested an amendment to Facility Operating Licenses (Docket Nos. 50-275, and 50-323) for the Diablo Canyon Power Plant, Units 1 and 2 (DCPP). The proposed amendments would revise the DCPP licensing bases that discusses the conformance of the plants delayed access source to 10 CFR Part 50, General Design Criteria 17. The NRC staff has determined that the following additional information is needed for the NRC staff to complete our review of the license amendment request (LAR). This request was discussed with Mr. Philippe Soenen of your staff on October 5, 2011, and it was agreed that a response would be provided by November 11, 2011. If circumstances result in the need to revise the requested response date, please contact James Polickosiki at (301) 415-5430 or via e-mail at James.Polickoski@nrc.gov.
In Section 2.0 of the LAR, the licensee states that the proposed change would revise Final Safety Analysis Report Update (FSARU) Section 8.2.1.2, "500-kV System," to add the following: "Plant procedures contain actions for operators to complete the 500-kV backfeed, isolation of RCP seal cooling, and restoration of RCS makeup flow within approximately 54 minutes upon loss of 230-kV and all onsite ac power.
Appendix A to 10 CFR 50, General Design Criterion 17, Electric power systems, states, in part, An onsite electric power system and an offsite electric power system shall be provided to permit functioning of structures, systems, and components important to safety. The safety function for each system (assuming the other system is not functioning) shall be to provide sufficient capacity and capability to assure that (1) specified acceptable fuel design limits and design conditions of the reactor coolant pressure boundary are not exceeded as a result of anticipated operational occurrences and (2) the core is cooled and containment integrity and other vital functions are maintained in the event of postulated accidents. ------. Electric power from the transmission network to the onsite electric distribution system shall be supplied by two physically independent circuits..Each of these circuits shall be designed to be available in sufficient time following a loss of all onsite alternating current power supplies and the other offsite electric power circuit, to assure that specified acceptable fuel design limits and design conditions of the reactor coolant pressure boundary are not exceeded. One of these circuits shall be designed to be available within a few seconds following a loss-of-coolant accident to assure that core cooling, containment integrity, and other vital safety functions are maintained.
Regulatory Guide 1.93, Availability of Electric Power Sources, states, in part, in Section A that the Limiting Condition of Operation with respect to available electric power sources is an electric power system that satisfies GDC 17 consists of the following electric power sources: (1) two physically independent circuits from the offsite transmission network, each of which is either continuously available or can be made available within a few seconds following a loss-of-coolant
accident (LOCA), (2) redundant onsite a.c. power supplies, and (3) redundant onsite d.c. power supplies.
NRC Standard Review Plan Section 8.2, Sub Section III, (e) states Each of the circuits from the offsite system to the onsite distribution buses should have the capacity and capability to supply the loads assigned to the bus or buses it is connected to during normal or abnormal operating conditions, accident conditions, or plant shutdown conditions. Therefore, the loads to be supplied during these conditions should be determined from information obtained in coordination with other branches. The capacity and electrical characteristics of transformers, breakers, buses, transmission lines, and the preferred power source for each path should be evaluated to assure that there is adequate capability to supply the maximum connected load during all plant conditions. The design should also be examined to assure that during transfer from one power source to another the design limits of equipment are not exceeded.
The NRC staff notes that the original licensing basis for the second offsite source (delayed) 500 kV power source for DCCP is approximately 30 seconds, as described in NRC Safety Evaluation Report, Safety Evaluation By The Directorate of Licensing U.S. Atomic Energy Commission In The Matter of Pacific Gas And Electric Company Diablo Canyon Nuclear Power Station, Units 1 And 2 San Luis Obispo County, California Docket Nos. 50-275 And 50-323.
Provide the technical and regulatory bases for the proposed time delay of approximately 54 minutes for the second offsite source. Explain how this proposed time delay is an acceptable for the delayed offsite circuit (500 kV source) to provide adequate capacity and capability to assure that (1) specified acceptable fuel design limits and design conditions of the reactor coolant pressure boundary are not exceeded as a result of anticipated operational occurrences and (2) the core is cooled and containment integrity and other vital functions are maintained in the event of postulated accidents. If the delayed offsite power source cannot meet the above requirement, explain how you plan to meet the above requirement.
Alan Wang Project Manager (DCPP)
Nuclear Regulatory Commission Division of Operating Reactor Licensing