|
---|
Category:- No Document Type Applies
MONTHYEARML20253A0092020-09-0202 September 2020 NRC-2020-000291/000292 - Resp 1 - Final, Agency Records Subject to the Request Are Enclosed ML20162A0472020-06-0303 June 2020 NRC-2020-000181 - Resp 1 - Final. Agency Records Subject to the Request Are Enclosed ML19261A0962019-09-12012 September 2019 NRC-2019-000288 - Resp 1 - Final, Agency Records Subject to the Request Are Enclosed (Decommissioning Funding Status Reports & Related Information) ML19261A1172019-09-12012 September 2019 NRC-2019-000288 - Resp 1 - Final, Agency Records Subject to the Request Are Enclosed (Spot Check SONGS 2 and 3 - 2008) ML18192A3912018-07-11011 July 2018 Restated Articles of Incorporation Are Executed Pursuant to the Provisions of Section 32 of Chapter 64, Laws 1975, Being Section 51-26-7 N,M.S.A. 1953, as Amended ML18192A4032018-07-11011 July 2018 Study Case 1986 MX-S3 ML18192B8112018-07-11011 July 2018 Prospectus, Employee Stock Purchase Plan of Southern California Edison Company ML17207A1002017-07-26026 July 2017 FAQ 17-02: Palo Verde Unit 3 Scram (Final NRC Response) ML17030A3232017-01-30030 January 2017 LTR-17-0038-1-Ticket - Roy Mathew, E-mail 2.206 Petition on Palo Verde Nuclear Generating Station, Unit 3 - Issuance of Amendment Nos. 199 and 200 Revision to Technical Specification 3.8.1, AC Alternating Current Source-Operating ML17026A3122017-01-23023 January 2017 LTR-17-0038-Ticket Roy Mathew, E-mail 2.206 Petition on Palo Verde Nuclear Generating Station, Unit 3 - Issuance of Amendment Nos. 199 and 200 Revision to Technical Specification 3.8.1, AC Alternating Current Source-Operating ML16054A0072016-02-12012 February 2016 FOIA/PA-2015-0294 - Resp 2 - Final, Final Response #2, Records Already Publicly Available ML16054A0132016-02-12012 February 2016 FOIA/PA-2015-0294 - Resp 2 - Final, Agency Records Subject to the Request Are Enclosed. Part 5 of 8 ML16054A0122016-02-12012 February 2016 FOIA/PA-2015-0294 - Resp 2 - Final, Agency Records Subject to the Request Are Enclosed. Part 4 of 8 ML16054A0102016-02-12012 February 2016 FOIA/PA-2015-0294 - Resp 2 - Final, Agency Records Subject to the Request Are Enclosed. Part 2 of 8 ML16054A0092016-02-12012 February 2016 FOIA/PA-2015-0294 - Resp 2 - Final, Agency Records Subject to the Request Are Enclosed. Part 8 of 8 ML16054A0152016-02-12012 February 2016 FOIA/PA-2015-0294 - Resp 2 - Final, Agency Records Subject to the Request Are Enclosed. Part 7 of 8 ML16054A0082016-02-12012 February 2016 FOIA/PA-2015-0294 - Resp 2 - Final, Agency Records Subject to the Request Are Enclosed. Part 1 of 8 ML16054A0142016-02-12012 February 2016 FOIA/PA-2015-0294 - Resp 2 - Final, Agency Records Subject to the Request Are Enclosed. Part 6 of 8 ML16054A0112016-02-12012 February 2016 FOIA/PA-2015-0294 - Resp 2 - Final, Agency Records Subject to the Request Are Enclosed. Part 3 of 8 ML15252A1112015-09-11011 September 2015 Newspaper Notice, Exigent License Amendment Request to Amend Technical Specification Surveillance Requirement 3.1.5.3 for Control Element Assembly 88 for the Remainder of Cycle 19 ML15014A1602015-01-14014 January 2015 Attachment 2 - NRC Working Group Recommendations to Revise the Substantive Cross-Cutting Issue Process ML15014A1532015-01-14014 January 2015 Attachment 1- NEI Comments on NRC Working Group Recommendations to Revise the Substantive Cross-Cutting Issue Process ML15027A1232014-12-19019 December 2014 Technical Specification (TS) Bases Revision 61, Replacement Pages and Insertion Instructions ML13273A2282013-09-27027 September 2013 FOIA/PA-2013-0329 - Resp - 1 - Final. Group a, Records Already Publicly Available. ML13015A2562012-12-17017 December 2012 Draft Submittal February 2013 FLEX Integrated Plan - Palo Verde ML12056A0522012-03-12012 March 2012 Enclosure 6 - List of Power Reactor Licensees and Holders of Construction Permits in Active or Deferred Status ML1127100332011-09-28028 September 2011 ROP Tabletop Examples and Results ML1027102822010-09-27027 September 2010 Draft Supplemental Information Required ML1019304602010-03-25025 March 2010 List of Historical Leaks and Spills at Us Commercial Nuclear Power Plants ML0906500232009-03-0606 March 2009 Safety Culture Policy Statement (Safety & Security) Comments ML0814805442008-05-23023 May 2008 Comments on Draft IP95003, IMC0305 and Lesson Learned Recommendations ML0808000362008-03-13013 March 2008 List of Attendees, 03/13/2008 Summary of Meeting with Eight Operating Nuclear Power Plant Licensees to Discuss Emerging Metallurgical Issues Certain Welds in Reactor Coolant System for Pressurized-Water Reactors ML0811305312008-02-15015 February 2008 Post Reg. Conference Reference Material - Simulator Review of JPM EP009-CR-001. ML0732400242007-10-25025 October 2007 Examples of Max Thermal Power License Conditions ML0729205572007-10-17017 October 2007 EA-07-162, Arizona Public Service Company, Confirmatory Order Modifying License (Effective Immediately) Office of Investigations Report No. 4-2007-009, Consent and Hearing Waiver Form ML0729205382007-10-16016 October 2007 IA-07-039, Mr. Mark Sharp, Confirmatory Order, NRC Office of Investigation Report No. 4-2007-009, Consent and Hearing Waiver Form ML0726303192007-09-14014 September 2007 P. Paquin Ltr Amendment to Certificate of Compliance No. 6574 for the Model No. 3-82B Package (TAC L24116)/ Register User List ML0726301142007-09-14014 September 2007 / P. Paquin Ltr Amendment to Certificate of Compliance No. 9208 for the Model No. 10-142B Package (TAC L24117)/S121170 ML0634705992006-12-14014 December 2006 Plant Service List ML0627201202006-09-29029 September 2006 Management Directive 8.3 Evaluation for Palo Verde Nuclear Generating Station (PV 06-19) ML0626503122006-09-0101 September 2006 Liquid Radiation Release Lessons Learned Task Force Final Report (Enclosure) ML0532204562005-11-15015 November 2005 Table Titled Palo Verde Unit 2 - June 14, 2004 Loss of Offsite Power Event - June 24, 2004 (8:04am) ML0532504172005-11-15015 November 2005 Preliminary Issue List, with Handwritten Notes ML0532504152005-11-15015 November 2005 Preliminary Issue List ML0532501252005-11-15015 November 2005 AIT Status ML0532204572005-11-15015 November 2005 Table Titled Palo Verde Unit 2 - June 14, 2004 Loss of Offsite Power Event - June 25, 2004 (9:49) ML0531300702005-11-0202 November 2005 Fault Description Document ML0531300792005-11-0202 November 2005 Loop Risk Assessment ML0613105192005-08-0101 August 2005 PV-08-2005-Outline Comments ML1015400272005-04-27027 April 2005 APS 2005a Palo Verde Nuclear Generating Station 2004 Air Emissions Inventory. PVNGS (1-1-PV-241) 2020-09-02
[Table view] |
Text
Palo Verde Offsite Power Supply Compliance with GDC 17.
The loss of offsite power event that occurred at Palo Verde on June 14, 2004 is classified as an "anticipated operational occurrence" as defined in I OCFR50 Appendix A: "...those conditions of normal operation which are expected to occur one or more times during the life of the nuclear power unit and include... loss of all offsite power." This is an analyzed design basis event as discussed in UFSAR section 15.2.6: LOSS OF NONEMERGENCY AC POWER-TO THE STATION AUXILIARIES. A frequency of five loss of offsite power events inthe life' of a unit was assumed in the Palo Verde design (UFSAR Table 3.9-1 .I.F.3.a).
General Design Criterion 17 discusses three elements of the power system: the transmission network, the offsite electric power system, and the onsite electric power system. These can be depicted as follows:
Transmission * , Ll Network Offsite sA Electric Power System Onsite Electric Power System The offsite electric power system delivers power from the transmission network to the onsite electric power system. GDC 17 imposes certain design conditions on the offsite electric power supply as follows:
Electric power from the transmission network to the onsite electric distribution system shall be supplied by two physically independent circuits (not necessarily on separate rights of way) designed and located so as to minimize to the extent practical the likelihood of their simultaneous failure under operating and postulated accident and environmental conditions.
The design of Palo Verde's offsite electric power system conforms to these conditions as discussed in UFSAR section 8.2.1.3.1. These design conditions specifically apply to the "two physically independent circuits" that deliver power from the transmission network to the onsite electric power system, and not to the transmission network, itself. Palo
. 11
. I Verde concurs with the NRC staff interpretation that there is no "requirement for meeting single failure, and in the absolute sense single failure cannot be met because there is only one power source, the grid."
There are many possible initiators for loss of offsite power events besides those that are prevented by proper design of the "two physically independent circuits". Certain other initiators are addressed in the Standard Review Plan (NUREG 0800). These are discussed in UFSAR section 8.2.2. This involves verification that:
..the system can withstand the following disturbances without loss of system stability or loss of load:
A. A permanent 3-phase fault on the switchyard 525 kV bus with subsequent loss of the critical 525 kV line.
B. Asudden loss of one of the three PVNGS units with no underfrequency load shedding measures in effect.
C. The sudden loss of the largest single load on the Arizona-New Mexico-California-Southern Nevada system.
Implicit in this review is the recognition that there are other disturbances not discussed in NUREG 0800 that are more severe (but less likely) that could cause a loss of system stability resulting in a loss of offsite power event. One such disturbance, among many others, is a major fault in combination with failure of an electrical protective device to actuate as occurred on June 14.
Palo Verde recognizes the importance of minimizing the frequency of loss of offsite power events and is tak ng steps to eliminate the vulnerabilities disclosed by the June 14 event.
2