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On May 29, 2008, at about 1136 PDT, the of … On May 29, 2008, at about 1136 PDT, the offsite power grid connected to San Onofre Nuclear Generating Station (SONGS) experienced a momentary disturbance. Control Room indicators alerted Operators that grid frequency dipped below 59.7 Hz, to about 59.6 Hz. Southern California Edison (SCE) reported this event in accordance with 10CFR50.72(b)(3)(v)(D) (NRC Log No. 44247). The frequency dip at SONGS lasted approximately 10 seconds and was caused by a disturbance on the Pacific DC Intertie line in California.</br></br>SCE is submitting this follow-up written report in accordance with 10CFR50.73(a)(2)(v)(D).</br></br>During the occurrence, Unit 2 was operating at about 99 percent power; Unit 3 was operating at about 80 percent power.</br></br>During this occurrence, all trains of Emergency Diesel Generation (EDG) (EK) on both Units 2 and 3 were available. The size and duration of the frequency dip was small. Consequently, there was little to no safety significance to the event. There are no corrective actions required at SONGS due to this event.</br></br>events.</br></br>NRC FORM 366 U.S. NUCLEAR REGULATORY I APPROVED BY OMB: NO. 3150-0104 EXPIRES: 08/31/2010 (9-2007) COMMISSION Estimated burden per response to comply with this mandatory information collection request: 50 hours.</br></br>Reported lessons learned are incorporated into the licensing process and fed back to industry. Send comments regarding burden estimate to the Records Management Branch (T-6 E6), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to bjs@nrc.gov, andLICENSEE EVENT REPORT (LER) to the Desk Officer, Office of Information and Regulatory Affairs, NEOB-10202 (3150-0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose information collection(See reverse for required number of does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and adigits/characters for each block) person is not required to respond to, the information collection.to respond to, the information collection.
May 29, 2008 +
On May 29, 2008, at about 1136 PDT, the of … On May 29, 2008, at about 1136 PDT, the offsite power grid connected to San Onofre Nuclear Generating Station (SONGS) experienced a momentary disturbance. Control Room indicators alerted Operators that grid frequency dipped below 59.7 Hz, to about 59.6 Hz. Southern California Edison (SCE) reported this event in accordance with 10CFR50.72(b)(3)(v)(D) (NRC Log No. 44247). The frequency dip at SONGS lasted approximately 10 seconds and was caused by a disturbance on the Pacific DC Intertie line in California.</br></br>SCE is submitting this follow-up written report in accordance with 10CFR50.73(a)(2)(v)(D).</br></br>During the occurrence, Unit 2 was operating at about 99 percent power; Unit 3 was operating at about 80 percent power.</br></br>During this occurrence, all trains of Emergency Diesel Generation (EDG) (EK) on both Units 2 and 3 were available. The size and duration of the frequency dip was small. Consequently, there was little to no safety significance to the event. There are no corrective actions required at SONGS due to this event.</br></br>events.</br></br>NRC FORM 366 U.S. NUCLEAR REGULATORY I APPROVED BY OMB: NO. 3150-0104 EXPIRES: 08/31/2010 (9-2007) COMMISSION Estimated burden per response to comply with this mandatory information collection request: 50 hours.</br></br>Reported lessons learned are incorporated into the licensing process and fed back to industry. Send comments regarding burden estimate to the Records Management Branch (T-6 E6), U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to bjs@nrc.gov, andLICENSEE EVENT REPORT (LER) to the Desk Officer, Office of Information and Regulatory Affairs, NEOB-10202 (3150-0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose information collection(See reverse for required number of does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and adigits/characters for each block) person is not required to respond to, the information collection.to respond to, the information collection.
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15:03:25, 27 November 2017 +
June 6, 2008 +
May 29, 2008 +
Disturbance on the Pacific DC Intertie cause offsite power frequency to dip below operability limits +
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