ML051710226
| ML051710226 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/29/2005 |
| From: | Donohew J NRC/NRR/DLPM/LPD4 |
| To: | |
| Donohew J N, NRR/DLPM,415-1307 | |
| Shared Package | |
| ML051710270 | List: |
| References | |
| TAC MC7189, TAC MC7190 | |
| Download: ML051710226 (9) | |
Text
June 29, 2005 LICENSEE: Southern California Edison (SCE, Licensee)
FACILITIES: San Onofre Nuclear Generating Station, Units 2 and 3 (SONGS)
SUBJECT:
MEETING WITH REPRESENTATIVES OF SOUTHERN CALIFORNIA EDISON FOR SAN ONOFRE NUCLEAR GENERATING STATION (TAC NOS. MC7189 AND MC7190)
A meeting was held on Friday, June 10, 2005, between the Nuclear Regulatory Commission (NRC) staff and the licensee for San Onofre Nuclear Generating Station, Units 2 and 3 (SONGS). The meeting was held at the request of the licensee for it to explain to the NRC staff its exigent license amendment request (LAR) submitted May 27, 2005 (ADAMS Accession No. ML051530034), in which the licensee included 7 calculations. The licensee proposes to lower the allowable values for dropout and pickup of the degraded voltage function in Surveillance Requirement (SR) 3.3.7.3.a, "Channel Calibration," of the SONGS Technical Specifications (TSs). The notice for the meeting was issued on May 26, 2005. is the list of attendees. Enclosure 2 is the material handed out by the licensee.
There was no handout from the NRC staff.
The agenda for the meeting is the following, which is the first page of Enclosure 2:
- Purpose of Meeting and Overview of May 27, 2005, Submittal
- General Design Approach of Revised Offsite Voltage Requirements
- Degraded Grid Relay Setting Calculation Overview
- Results of Steady State and Dynamic System Level Analysis
- Required Plant Modifications and Implementing Schedule The licensee stated that the SONGS minimum switchyard voltage for degraded grid voltage protection is 218 kV; however, the licensee has recently performed evaluations that indicate 222.2 kV is the voltage required for operability of the immediate access to offsite power.
Without access to offsite power, SONGS safety buses would be powered from the diesel generators, and, because offsite power, not the diesel generators, is the preferred source of power, the licensee stated that the LAR is to establish the 218 kV as the minimum switchyard voltage.
In discussing the sustained degraded voltage protection, the NRC staff questioned the licensee about the information provided on the sustained degraded voltage signal (SDVS) on the top of page 3 of Enclosure 2 to the licensee's application. The licensee agreed that item (1) on the SDVS with the safety injection actuation signal (SIAS) (i.e., the DGVSS) is confusing and can be deleted from the application.
After the licensee's presentation on the five bullets given above, the meeting broke into two separate meetings on (1) the details of the dropout and pickup voltage calculations that were attached to the licensee's application dated May 27, 2005, and (2) the methodology for determining the dropout and pickup voltage setpoints.
In the separate meetings numbered 1 and 2, the staff identified additional information that it needed for its review of the LAR. The questions for the additional information are given in .
The NRC staff completed its discussion of the licensee's application, and the meeting was closed.
/RA/
Jack Donohew, Senior Project Manager, Section 2 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No(s).: 50-361 and 50-362
Enclosures:
- 1. List of Meeting Attendees
- 2. Licensee's Handout (ADAMS Accession No. Ml051640430)
- 3. Additional Information Needed by NRC Staff cc w/encls: See next page
Ml051640430)
- 3. Additional Information Needed by NRC Staff cc w/encls: See next page DISTRIBUTION:
PUBLIC PDIV-2 Reading RidsNrrDlpm(JZwolinski/TMarsh) RJenkins RidsNrrDlpmPdiv(CHolden) AHowe RidsNrrPMJDonohew OChopra RidsNrrSCSDembek APal RidsNrrLALFeizollahi SMazumdar RidsOgcRp TPruett, RIV RidsAcrsAcnwMailCenter PRebstock Notice: ML051460142 Agenda: ML051450585 ADAMS ACCESSION NO.: ML051710226 PKG.: ML051710270 NRC-001 OFFICE PDIV-2/PM PDIV-2/LA EEIB-A/SC EEIB-B/SC PDIV-2/SC NAME JDonohew:sp DBurnette AHowe RJenkins DCollins DATE 6/22/05 6/28/05 6/27/2005 6/23/05 6/29/05 DOCUMENT NAME: E:\Filenet\ML051710226.wpd LIST OF ATTENDEES AT MEETING OF JUNE 10, 2005 ON SOUTHERN CALIFORNIA EDISON APPLICATION SUBMITTED MAY 27, 2005 NAME AFFILIATION J. Donohew NRC/NRR/PDIV-2 A. Howe NRC/NRR/EEIB R. Jenkins NRC/NRR/EEIB O. Chopra NRC/NRR/EEIB A. Pal NRC/NRR/EEIB P. Rebstock NRC/NRR/EEIB S. Mazumdar NRC/NRR/EEIB J. Rainsberry SCE L. Conklin SCE J. King SCE M. Morgan SCE K. Hara SCE K. Johnson SCE J. Summy SCE Where: EEIB = Electrical and Instrumentation and Controls Branch NRC = Nuclear Regulatory Commission NRR = Office of Nuclear Reactor Regulation PDIV-2= Project Directorate IV-2 SCE = Southern California Edison ENCLOSURE 1
LICENSEE'S HANDOUT FOR JUNE 10, 2005, MEETING ADAMS ACCESSION NO. ML051640430 The licensee's handout contained the following:
- 1. The licensee's agenda for the meeting (1 page).
- 2. Tables on U2 Trains A and B, U3 Trains A and B, and Common (5 pages).
- 3. Degraded Grid Plan (14 pages).
- 4. Analysis Limits Voltage, Surveillance Voltage, and Technical Specification (Tech Spec)
Voltage for 230 kV Switchyard Voltage at 218 kV and 219 kV (2 pages).
ENCLOSURE 2
ADDITIONAL INFORMATION NEEDED BY NRC STAFF (13 Questions)
- 1. Provide 4160V and 480 V continuous (operating) voltage ranges (i.e. 4160 +/- 10%) and minimum rated starting voltage for motors. State that our analysis using ~215kv in the switchyard shows adequate voltages for starting and continuous operation. Provide a summary table of the results including where they came from:
Voltage Minimum Starting Analysis Where from Level Continuous Voltage Voltage Result Calculation 4160 480
- 2. Provide a summary of the ongoing evaluation of voltages at the 280V/120V levels and address how these loads will have adequate terminal voltages during all conditions.
- 3. Provide rated voltages for transformers that supply the 4KV buses (reserve auxiliary transformers), motors, and the diesel generator (DG), including the DG automatic voltage regulator setting
- 4. Discuss and provide the SDVS/DGVSS logic diagram from the design basis document (DBD), and also provide the schematic and elementary diagram for these relays.
- 5. Submit the applicable page of the Electrical Transient Analysis Program report for one 4KV and one 480V motor starting that shows the initial, starting and post-starting voltages.
- 6. Send a copy of the sequencing overlap calculation graph that demonstrates the imprecise (but within allowable value) sequence timer operation is acceptable.
- 7. State that there are no random loads that will come on at the 480VAC and 208V/120V levels during load sequencing or if there are some random loads, explain how they are accounted for in the calc.
- 8. Explain the 4.11 second timer setpoint in Technical Specification (TS) 3.3.7 and the basis for the 4.11 seconds in Calculation E4C-082. Also, describe how one timer opens the voltage check window with a SIAS present and another timer closes the voltage check window.
- 9. Submit the assumption sections from the base calculations for Calculations E4C-082 and -090.
- 10. Explain, column by column, what is on Calculation E4C-090 CCN 117 page 8, as well the last column on page 37 of the same calculation.
ENCLOSURE 3
- 11. Submit general criteria to determine new settings of the degraded voltage protection relay (dropout and pickup values).
- 12. Since it takes approximately 6.6 seconds (i.e., 4.44 seconds delay plus the 2.17 seconds relay time) for the degraded grid relays to disconnect from the offsite power source when the SIAS signal is present, discuss what happens to those loads that are already sequenced on the safety buses assuming concurrent SIAS and degraded grid conditions. In addition, discuss the operation of the loads if SIAS occurs first in the above scenario. Discuss if there may be any problem in re-starting those loads on the DG.
- 13. It was stated in the meeting that on a sustained degraded grid condition, the SDVS will separate safety buses from the offsite power system if the degraded grid conditions are not improved within 130 seconds. Discuss if the plant is tripped under these conditions and indicate, if the plant is tripped, what signal trips the reactor in this scenario. If not, what actions are taken to prevent sequencing of safe shutdown loads on the safety bus when supplied by DG.
San Onofre Nuclear Generating Station Units 2 and 3 cc:
Mr. Daniel P. Breig, Plant Manager Mr. Ed Bailey, Chief Nuclear Generation Radiologic Health Branch Southern California Edison Company State Department of Health Services San Onofre Nuclear Generating Station Post Office Box 997414 (MS7610)
P. O. Box 128 Sacramento, CA 95899-7414 San Clemente, CA 92674-0128 Resident Inspector/San Onofre NPS Mr. Douglas K. Porter c/o U.S. Nuclear Regulatory Commission Southern California Edison Company Post Office Box 4329 2244 Walnut Grove Avenue San Clemente, CA 92674 Rosemead, CA 91770 Mayor Mr. David Spath, Chief City of San Clemente Division of Drinking Water and 100 Avenida Presidio Environmental Management San Clemente, CA 92672 P. O. Box 942732 Sacramento, CA 94234-7320 Mr. Dwight E. Nunn, Vice President Southern California Edison Company Chairman, Board of Supervisors San Onofre Nuclear Generating Station County of San Diego P.O. Box 128 1600 Pacific Highway, Room 335 San Clemente, CA 92674-0128 San Diego, CA 92101 Mr. James D. Boyd, Commissioner Eileen M. Teichert, Esq. California Energy Commission Supervising Deputy City Attorney 1516 Ninth Street (MS 31)
City of Riverside Sacramento, CA 95814 3900 Main Street Riverside, CA 92522 Mr. Ray Waldo, Vice President Southern California Edison Company Mr. Gary L. Nolff San Onofre Nuclear Generating Station Power Projects/Contracts Manager P.O. Box 128 Riverside Public Utilities San Clemente, CA 92764-0128 2911 Adams Street Riverside, CA 92504 Mr. Brian Katz Vice President, Nuclear Oversight and Regional Administrator, Region IV Regulatory Affairs.
U.S. Nuclear Regulatory Commission San Onofre Nuclear Generating Station 611 Ryan Plaza Drive, Suite 400 P.O. Box 128 Arlington, TX 76011-8064 San Clemente, CA 92764-0128 Mr. Michael Olson San Diego Gas & Electric Company P.O. Box 1831 San Diego, CA 92112-4150 April 2005
San Onofre Nuclear Generating Station Units 2 and 3 cc:
Mr. Steve Hsu Department of Health Services Radiologic Health Branch MS 7610, P.O. Box 997414 Sacramento, CA 95899 Adolfo Bailon Field Representative United States Senator Barbara Boxer 312 N. Spring St. Suite 1748 Los Angeles, CA. 90012 Mr. Harold B. Ray Executive Vice President Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128, Mail Stop: D-3-F San Clemente, CA 92674-0128