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==Dear Mr. Ray:==
==Dear Mr. Ray:==
On August 25, 2005, a loss of a major western transmission line occurred just as California power use was approaching its peak. This forced the California Independent System Operator (CAISO) to issue a Transmission Emergency Notice for Southern California and to request utilities in the Southern Region to reduce demand on the system by dropping 900 megawatts of firm load and 800 megawatts of voluntary, interruptible customers. The Nuclear Regulatory Commission staff is concerned that these conditions may have challenged the operability of the offsite power for San Onofre Nuclear Generating Station (SONGS), Units 2 and 3. While the problem was adequately resolved by the end of the day, we would appreciate your assessment of your communications with the CAISO as it relates to grid conditions and reliable offsite power for SONGS.
On August 25, 2005, a loss of a major western transmission line occurred just as California power use was approaching its peak. This forced the California Independent System Operator (CAISO) to issue a Transmission Emergency Notice for Southern California and to request utilities in the Southern Region to reduce demand on the system by dropping 900 megawatts of firm load and 800 megawatts of voluntary, interruptible customers. The Nuclear Regulatory Commission staff is concerned that these conditions may have challenged the operability of the offsite power for San Onofre Nuclear Generating Station (SONGS), Units 2 and 3. While the problem was adequately resolved by the end of the day, we would appreciate your assessment of your communications with the CAISO as it relates to grid conditions and reliable offsite power for SONGS.
We are making continued efforts to ensure appropriate communication between nuclear power plant operators and grid operators. The issuance of Temporary Instruction 2515/163, Operational Readiness of Offsite Power, is a recent effort to take a snapshot of relevant operational readiness at nuclear power plants. Any information that addresses the following questions would enable us to better understand the effectiveness of your efforts in this area.
We are making continued efforts to ensure appropriate communication between nuclear power plant operators and grid operators. The issuance of Temporary Instruction 2515/163, Operational Readiness of Offsite Power, is a recent effort to take a snapshot of relevant operational readiness at nuclear power plants. Any information that addresses the following questions would enable us to better understand the effectiveness of your efforts in this area.
: 1.       Did the CAISO issue any warnings on the abnormal conditions for August 25, 2005? If there were any warnings, what were those warnings and when were they issued?
1.
: 2.       What type of warnings were directly communicated to SONGS?
Did the CAISO issue any warnings on the abnormal conditions for August 25, 2005? If there were any warnings, what were those warnings and when were they issued?
: 3.       Was there any communication with SONGS from the transmission system operator (TSO)/CAISO before or after load shedding was ordered on the grid?
2.
: 4.       Did the communication with the grid operators/CAISO meet your expectations?
What type of warnings were directly communicated to SONGS?
: 5.       Recognizing the significance of the grid transient, what is your assessment regarding the adequacy of the interaction with the TSO/CAISO that you experienced during this event?
3.
Was there any communication with SONGS from the transmission system operator (TSO)/CAISO before or after load shedding was ordered on the grid?
4.
Did the communication with the grid operators/CAISO meet your expectations?
5.
Recognizing the significance of the grid transient, what is your assessment regarding the adequacy of the interaction with the TSO/CAISO that you experienced during this event?  


H. Ray                                         We would appreciate your comments by September 30, 2005. If you have any questions regarding the information in this letter, please contact Mr. Girija Shukla at 301-415-8439.
H. Ray We would appreciate your comments by September 30, 2005. If you have any questions regarding the information in this letter, please contact Mr. Girija Shukla at 301-415-8439.
Sincerely, Ledyard B. Marsh, Director /RA/
Sincerely, Ledyard B. Marsh, Director /RA/
Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-361 and 50-362 cc: See next page
Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-361 and 50-362 cc: See next page


H. Ray                                         We would appreciate your comments by September 30, 2005. If you have any questions regarding the information in this letter, please contact Mr. Girija Shukla at 301-415-8439.
H. Ray We would appreciate your comments by September 30, 2005. If you have any questions regarding the information in this letter, please contact Mr. Girija Shukla at 301-415-8439.
Sincerely, Ledyard B. Marsh, Director /RA/
Sincerely, Ledyard B. Marsh, Director /RA/
Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-361 and 50-362 cc: See next page DISTRIBUTION:
Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-361 and 50-362 cc: See next page DISTRIBUTION:
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RidsOgcRp TKoshy RJenkins JCalvo RidsNrrDE ACCESSION NO.: ML052450470 NRR-106 OFFICE PDIV-2/PM PDIV-2/LA PDIV/PD DLPM/D NAME GShukla DClarke HBerkow LMarsh DATE 9/2/05 9/2/05 9/2/05 9/2/05 OFFICIAL RECORD COPY


San Onofre Nuclear Generating Station Units 2 and 3 cc:
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)
Mr. Daniel P. Breig, Plant Manager Nuclear Generation Southern California Edison Company San Onofre Nuclear Generating Station P. O. Box 128 San Clemente, CA 92674-0128 Mr. Douglas K. Porter Southern California Edison Company 2244 Walnut Grove Avenue Rosemead, CA 91770 Mr. David Spath, Chief Division of Drinking Water and Environmental Management P. O. Box 942732 Sacramento, CA 94234-7320 Chairman, Board of Supervisors County of San Diego 1600 Pacific Highway, Room 335 San Diego, CA 92101 Eileen M. Teichert, Esq.
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. James T. Reilly 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)
Supervising Deputy City Attorney City of Riverside 3900 Main Street Riverside, CA 92522 Mr. Gary L. Nolff Power Projects/Contracts Manager Riverside Public Utilities 2911 Adams Street Riverside, CA 92504 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Mr. Michael Olson San Diego Gas & Electric Company P.O. Box 1831 San Diego, CA 92112-4150 Mr. Ed Bailey, Chief Radiologic Health Branch State Department of Health Services Post Office Box 997414 (MS7610)
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.
Sacramento, CA 95899-7414 Resident Inspector/San Onofre NPS c/o U.S. Nuclear Regulatory Commission Post Office Box 4329 San Clemente, CA 92674 Mayor City of San Clemente 100 Avenida Presidio San Clemente, CA 92672 Mr. James T. Reilly Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 Mr. James D. Boyd, Commissioner California Energy Commission 1516 Ninth Street (MS 31)
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                                Mr. Steve Hsu San Diego Gas & Electric Company                Department of Health Services P.O. Box 1831                                    Radiologic Health Branch San Diego, CA 92112-4150                        MS 7610, P.O. Box 997414 Sacramento, CA 95899}}
Sacramento, CA 95814 Mr. Ray Waldo, Vice President Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92764-0128 Mr. Brian Katz Vice President, Nuclear Oversight and Regulatory Affairs.
San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92764-0128 Mr. Steve Hsu Department of Health Services Radiologic Health Branch MS 7610, P.O. Box 997414 Sacramento, CA 95899}}

Latest revision as of 15:39, 15 January 2025

California Independent System Operator (Caiso) Communications with Southern California Edison Company During the Power Line Outage on August 25, 2005
ML052450470
Person / Time
Site: San Onofre  Southern California Edison icon.png
Issue date: 09/02/2005
From: Marsh L
NRC/NRR/DLPM
To: Ray H
Southern California Edison Co
SHUKLA G , NRR/DLPM/PD4, 415-8420
References
Download: ML052450470 (4)
v • d • e


Text

September 2, 2005 Mr. Harold B. Ray Executive Vice President Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128

SUBJECT:

CALIFORNIA INDEPENDENT SYSTEM OPERATOR (CAISO)

COMMUNICATIONS WITH SOUTHERN CALIFORNIA EDISON COMPANY DURING THE POWER LINE OUTAGE ON AUGUST 25, 2005

Dear Mr. Ray:

On August 25, 2005, a loss of a major western transmission line occurred just as California power use was approaching its peak. This forced the California Independent System Operator (CAISO) to issue a Transmission Emergency Notice for Southern California and to request utilities in the Southern Region to reduce demand on the system by dropping 900 megawatts of firm load and 800 megawatts of voluntary, interruptible customers. The Nuclear Regulatory Commission staff is concerned that these conditions may have challenged the operability of the offsite power for San Onofre Nuclear Generating Station (SONGS), Units 2 and 3. While the problem was adequately resolved by the end of the day, we would appreciate your assessment of your communications with the CAISO as it relates to grid conditions and reliable offsite power for SONGS.

We are making continued efforts to ensure appropriate communication between nuclear power plant operators and grid operators. The issuance of Temporary Instruction 2515/163, Operational Readiness of Offsite Power, is a recent effort to take a snapshot of relevant operational readiness at nuclear power plants. Any information that addresses the following questions would enable us to better understand the effectiveness of your efforts in this area.

1.

Did the CAISO issue any warnings on the abnormal conditions for August 25, 2005? If there were any warnings, what were those warnings and when were they issued?

2.

What type of warnings were directly communicated to SONGS?

3.

Was there any communication with SONGS from the transmission system operator (TSO)/CAISO before or after load shedding was ordered on the grid?

4.

Did the communication with the grid operators/CAISO meet your expectations?

5.

Recognizing the significance of the grid transient, what is your assessment regarding the adequacy of the interaction with the TSO/CAISO that you experienced during this event?

H. Ray We would appreciate your comments by September 30, 2005. If you have any questions regarding the information in this letter, please contact Mr. Girija Shukla at 301-415-8439.

Sincerely, Ledyard B. Marsh, Director /RA/

Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-361 and 50-362 cc: See next page

H. Ray We would appreciate your comments by September 30, 2005. If you have any questions regarding the information in this letter, please contact Mr. Girija Shukla at 301-415-8439.

Sincerely, Ledyard B. Marsh, Director /RA/

Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-361 and 50-362 cc: See next page DISTRIBUTION:

PUBLIC PDIV-2 Reading RidsNrrDlpmPdiv (HBerkow)

RidsNrrPMGShukla RidsNrrLALFeizollahi RidsNrrDlpmPdiv2 (DCollins)

RidsAcrsAcnwMailCenter RidsNrrDLPM RidsRegion4MailCenter (BJones)

RidsOgcRp TKoshy RJenkins JCalvo RidsNrrDE ACCESSION NO.: ML052450470 NRR-106 OFFICE PDIV-2/PM PDIV-2/LA PDIV/PD DLPM/D NAME GShukla DClarke HBerkow LMarsh DATE 9/2/05 9/2/05 9/2/05 9/2/05 OFFICIAL RECORD COPY

San Onofre Nuclear Generating Station Units 2 and 3 cc:

Mr. Daniel P. Breig, Plant Manager Nuclear Generation Southern California Edison Company San Onofre Nuclear Generating Station P. O. Box 128 San Clemente, CA 92674-0128 Mr. Douglas K. Porter Southern California Edison Company 2244 Walnut Grove Avenue Rosemead, CA 91770 Mr. David Spath, Chief Division of Drinking Water and Environmental Management P. O. Box 942732 Sacramento, CA 94234-7320 Chairman, Board of Supervisors County of San Diego 1600 Pacific Highway, Room 335 San Diego, CA 92101 Eileen M. Teichert, Esq.

Supervising Deputy City Attorney City of Riverside 3900 Main Street Riverside, CA 92522 Mr. Gary L. Nolff Power Projects/Contracts Manager Riverside Public Utilities 2911 Adams Street Riverside, CA 92504 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Mr. Michael Olson San Diego Gas & Electric Company P.O. Box 1831 San Diego, CA 92112-4150 Mr. Ed Bailey, Chief Radiologic Health Branch State Department of Health Services Post Office Box 997414 (MS7610)

Sacramento, CA 95899-7414 Resident Inspector/San Onofre NPS c/o U.S. Nuclear Regulatory Commission Post Office Box 4329 San Clemente, CA 92674 Mayor City of San Clemente 100 Avenida Presidio San Clemente, CA 92672 Mr. James T. Reilly Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 Mr. James D. Boyd, Commissioner California Energy Commission 1516 Ninth Street (MS 31)

Sacramento, CA 95814 Mr. Ray Waldo, Vice President Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92764-0128 Mr. Brian Katz Vice President, Nuclear Oversight and Regulatory Affairs.

San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92764-0128 Mr. Steve Hsu Department of Health Services Radiologic Health Branch MS 7610, P.O. Box 997414 Sacramento, CA 95899

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