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MONTHYEARML0713005002007-05-15015 May 2007 (Songs 2 and 3) - Request for Additional Information on the Proposed Amendment to Revise Loss of Voltage Signal Relay Replacement Project stage: RAI ML0725502572007-09-24024 September 2007 Request for Additional Information on the Proposed Amendment to Revise Loss of Voltage Signal Relay Replacement (Tac Nos. MD5112 and MD5113) Project stage: RAI ML0731200832007-11-0505 November 2007 Calculation E4C-015, Revision 0, Tlu Calculation for Loss of Voltage Relays at Class 1E 4.16 Kv Switchgear Project stage: Other ML0731200822007-11-0505 November 2007 Supplement 1 and Response to Requests for Additional Information on the Proposed Amendment for Loss of Voltage Signal (Lovs) Relay Replacement, Proposed Change Number (PCN) 577 Project stage: Supplement ML0801605092008-01-15015 January 2008 Response to Request for Additional Information on the Proposed Amendment for Loss of Voltage Signal (Lovs) Relay Replacement, Proposed Change Number (PCN-577) Project stage: Response to RAI ML0805203642008-02-19019 February 2008 Response to Request for Additional Information on the Proposed Amendment for Loss of Voltage Signal (Lovs) Relay Replacement, Proposed Change Number (PCN) Project stage: Response to RAI ML0806001622008-03-25025 March 2008 Tech Spec Pages for Amendment Nos. 216 and 208, Revise Technical Specification Surveillance Requirements 3.3.7.3.a and 3.8.1 Degraded Voltage Function Values Project stage: Other ML0806001502008-03-25025 March 2008 Issuance of Amendment Nos. 217 and 209, Revise Technical Specification Surveillance Requirements 3.3.7.3.a and 3.8.1 Degraded Voltage Function Values Project stage: Approval 2007-09-24
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Category:Letter
MONTHYEARML24022A1492024-01-17017 January 2024 Independent Spent Fuel Storage Installation, Revision 4 to the Physical Security Plan IR 05000361/20230062023-11-29029 November 2023 NRC Inspection Report 05000361/2023-006 and 05000362/2023-006 ML23333A0682023-11-22022 November 2023 (SONGS) Units 1, 2, 3 and Independent Spent Fuel Storage Installation - Notification of Change in Nuclear Officer IR 05000361/20230052023-10-11011 October 2023 NRC Inspection Report 05000361/2023005 and 05000362/2023005 ML23276A5942023-09-28028 September 2023 and Independent Spent Fuel Storage Installation - Supplement to Decommissioning Funding Status Reports ML23268A0922023-09-20020 September 2023 Generation Station, Units 1, 2 and 3, and the Independent Spent Fuel Storage Facility (ISFSI) - Re-Registration of Dry Fuel Storage Casks for Amended Certificate of Compliance No. 1040 IR 05000361/20230012023-09-13013 September 2023 NRC Inspection Report 05000361 2023-001 and 05000362 2023-004 ML23240A5372023-08-18018 August 2023 Confirmatory Survey Activities Summary and Results for the Unit 2 and 3 Intake Structures at the San Onofre Nuclear Generating Station San Clemente CA ML23129A1802023-06-14014 June 2023 Cover Letter to State of CA on Draft EA Regarding San Onofre ISFSI Updated DFPs IR 05000361/20230032023-05-31031 May 2023 NRC Inspection Report 05000361/2023003 and 05000362/2023003 IR 05000361/20230022023-05-23023 May 2023 NRC Inspection Report 05000361/2023-002 and 05000362/2023-002 ML23137A1032023-05-11011 May 2023 (Songs), Units 1, 2 and 3, and Independent Spent Fuel Storage Installation - 2022 Annual Radiological Environmental Operating Report ML23123A0932023-04-28028 April 2023 (Songs), Units 1, 2 and 3, Submittal of Annual Radioactive Effluent Release Report - 2022 ML23230A0882023-04-10010 April 2023 Independent Spent Fuel Storage Installation - Decommissioning Quality Assurance Plan ML23094A1272023-03-29029 March 2023 Independent Spent Fuel Storage Installation - 10 CFR 50.82(a)(8)(v and VII) and 10 CFR 72.30(c) Decommissioning Funding Status Report 2021 ML23094A1332023-03-29029 March 2023 Nuclear Property Insurance ML23062A1172023-02-28028 February 2023 Generation Station Units 1, 2 and 3, Annual Radioactive Effluent Release Report for Independent Spent Fuel Storage Installation - 2022 ML22361A1022023-02-24024 February 2023 Reactor Decommissioning Branch Project Management Changes for Some Decommissioning Facilities and Establishment of Backup Project Manager for All Decommissioning Facilities ML23059A2812023-02-22022 February 2023 (Songs), Units 1, 2 and 3, 2022 Annual Turtle Incidental Take Report ML23046A3792023-02-22022 February 2023 NRC Inspection Report 050-00361/2023-001 and 050-00362/2023-001 ML23045A2022023-02-0909 February 2023 Submittal of Annual Corporate Financial Reports for San Onofre Nuclear Generating Station (SONGS) Units 2 and 3 for Fy Ending June 30, 2022 ML22287A1352023-01-0505 January 2023 Issuance of Exemption from Title 10 of the Code of Federal Regulations Part 72.106(B), Independent Spent Fuel Storage Installation Controlled Area Boundary (L-2021-LLE-0056) ML22348A0622023-01-0404 January 2023 NRC to SCE, Transmittal of the National Marine Fisheries Service'S December 12, 2022, Letter of Concurrence for Decommissioning of San Onofre Nuclear Generating Statiion, Units 2 and 3 IR 05000206/20220062022-12-15015 December 2022 NRC Inspection Report 05000206/2022006, 05000361/2022-006, and 05000362/2022-006 ML22347A2122022-12-12012 December 2022 NMFS to NRC, Endangered Species Act Section 7(a)(2) Concurrence Letter for Decommissioning of the San Onofre Nuclear Generating Station ML22340A6652022-12-0505 December 2022 Letter from John Fassell, Chief; 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A. Edward Scherer r EDISON SOUTHERN CALIFORNIA Director Nuclear Regulatory Affairs An EDISON INTERNATIONAL Company January 15, 2008 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
Subject:
Docket Nos. 50-361 and 50-362 Response to Request for Additional Information on the Proposed Amendment for Loss of Voltage Signal (LOVS) Relay Replacement, Proposed Change Number (PCN) 577 (TAC Nos. MD5112 and MD5113)
San Onofre Nuclear Generating Station, Units 2 and 3
Reference:
March 30, 2007 letter from B. Katz (SCE) to Document Control Desk (NRC),
Subject:
San Onofre Nuclear Generating Station Units 2 and 3, Docket Nos. 50-361 and 50-362, Proposed Change Number (PCN)-577, LOVS Relay Replacement
Dear Sir or Madam:
By letter dated March 30, 2007 Southern California Edison (SCE) submitted the referenced Proposed Change Number (PCN)-577, LOVS Relay Replacement. In a telephone conversation on January 7, 2008, NRC staff requested'additional information regarding the submittal. The NRC staff question and the SCE response are contained in the enclosure.
This submittal contains no new regulatory commitments.
If you have any questions or require additional information, please contact Ms. Linda T.
Conklin at (949) 368-9443.
Sincerely, Enclosure cc: E. E. Collins, Regional Administrator, NRC Region IV N. Kalyanam, NRC Project Manager, San Onofre Units 2 and 3 C. C. Osterholtz, NRC Senior Resident Inspector, San Onofre Units 2 and 3 74bo I P.O. Box 128 San Clemente, CA 92674
ENCLOSURE NRC QUESTION In the LAR dated March 30, 2007, the licensee stated the following on Page 1 of : "The 115.5 V initial voltage (110% of the 105 V setpoint) to 57 V minimum voltage is selected based on the available manufacturer's relay curves which provided the specific time at 57 V when voltage is dropped from 115.5 V."
The Technical Specification change request also states for the requested time delay "(voltage change from 115.5 V to 57.0 V)".
Staff reviewers could not confirm the above from the manufacturer's catalog for the BEI-27 relay. The curves provided for the relay provide the operating time in terms of voltage difference from the pickup setting (nominal 105.0 V) and the time dial.
SCE RESPONSE Applicable inverse timing characteristic curves for the loss of voltage relay are shown in the manufacturer's enclosed Figure 3-2 using range 3. The horizontal scale of Figure 3-2 (range 3) shows voltage difference (0 to 48 volts) from the relay pickup setting. The manufacturer's catalog for the model BE1-27 relay describes that the inverse time curves were generated with prefault voltages at 10% higher than pickup for the model 27 relay curves (page 1-5, enclosed).
Figure 3-2 therefore shows that a relay with a voltage tap setting of 105 V will operate as follows:
- 1) When the system voltage drops from a prefault voltage of 115.5 V (110% of relay pickup voltagel05 V) to 105 V (0 V difference from the relay pickup setting), the relay will take more than 4 seconds to operate ifthe time dial is set at #7, or more than 10 seconds for time dial setting at #20.
- 2) When the system voltage drops from a prefault voltage of 115.5 V (110% of relay pickup voltagel 05 V) to 57 V (57 V = 105 V -48 V), the relay will operate within 0.4 seconds if time dial is set at #7 or more than 1.0 second for time dial setting at
- 20.
Figure 3-2 does not give relay operating times when the system voltage drops from 110% of the relay pickup setting to zero volts. The manufacturer does not provide relay operating times for this case because they do not have official test data.
Therefore, it was determined that the allowable time delay in the proposed Technical Specification (0.69 to 1.0 second, inclusive) should be measured when the voltage changes from 115.5 V (prefault voltage = 110% of LOV relay pickup setting) to 57 V (105 V- 48 V), which is the lowest voltage shown in the Figure 3-2.
Page 1 of 3
Inverse Time Inverse curve types are defined by the Style Chart and are represented by the curves shown in Section 3, Functional Description. Inverse time is adjustable from 01 to 99 in increments of 01. Incrementing the time dial varies the inverse curve along the Y axis. A setting of,00 designates instantaneous timing.
Inverse Time Accuracy Within +/-5% or 50 ms (whichever is greater) of the indicated time for any combination of time dial setting and pickup setting and is repeatable within +/-2% or 50 ms (whichever is greater) for any combination of time dial and tap setting. Curves were generated .
with prefault voltages at 10% greater than pickup for the 27 curves and 10% less than pickup for the 59 curves. For prefault voltages that are greater in difference from the pickup setting, the timing accuracy is +/-10% or 100 ms (whichever is greater).
UL Recognition UL Recognized per Standard 508, UL File No. E97033. Note:
Output contacts are not UL Recognized for voltages greater than 250 V.
Isolation Meets IEC 255-5 and exceeds ANSI/IEEE C37.90 one minute dielectric test as follows:
All Circuits to Ground: 2,828 Vdc (excludes communication ports).
Communication Ports to Ground: 500 Vdc.
Input Circuits to Output Circuits: 2;000 Vac or 2,828 Vdc.
Surge Withstand Capability: Qualified to IEEE C37.90.1-1989 StandardSurge Withstand Oscillatory Capability(SWC) Tests for Protective Relays and Relay Systems (excluding communication ports).
Fast Transient Qualified to IEEE C37.90.1-1989 Standard Surge Withstand Capability(SWC) Tests for Protective Relays and Relay Systems.
(Excluding communication ports).
Electrostatic Discharge (ESD) Four kilovolts contact discharges and 8 kilovolts air discharges CE Certified applied in accordance with Qualification EN61000-4-2.
Radio Frequency Interference Qualified to IEEE C37.90.2-1995 Standardfor Withstand Capability Of Relay Systems to Radiated ElectromagneticInterference from Transceivers.
Impulse Test Qualified to IEC 255-5.
Shock 15 g in each of three mutually perpendicular axes.
Vibration .2 g in each of three mutually perpendicular axes swept over the range of 10 to 500 Hz for a total of si x sweeps, 15 minutes each sweep.
Temperature:
Operating -400 C (-400 F) to +70' C (+158' F)
Storage -650 C (-850 F) to +1000 C (+2120 F)
Weight 14 pounds maximum.
Case Size All units supplied in an Sl size case.
Page 2 of 3 BEl-27/59 General Information 1-5
100 10 lo1
-1.0 0.1 C 48 44 40 36 a,? 28 24 20 16 12 8 4 *,*0 Ranqe3 96 88 80 72 64 56 48 40 32 24 16 8 '0 Range 4 02867-23 Voltage Difference From Pickup 0 Figure 3-2. Undervoltage, Short Inverse Timing CharacteristicCurve .. ..10 TV 1000 100 O0 10 en CL 1.
1.0 1 i i - i i0.1 48 44 40 36 32 : 28 24 20 16 12 8 4 0 Range 3 96 88 80 72 64 56 48 40 32 24 16 8 0 Range 4 D2857-24 Voltage Difference From Pickup 06-09-03 Figure 3-3. Undervoltage Medium Inverse Timing CharacteristicCurve P'age 3 of 3 BE127/59 Functional Description 3-3