ENS 45178
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ENS Event | |
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22:13 Jun 30, 2009 | |
Title | Potential Media Interest Due to Forced Outage |
Event Description | On June 30, 2009, at 1513 PDT, Unit 2 commenced a ramp[-down] in accordance with the annunciator response guidance to enter Operating Procedure (OP) Abnormal Procedure AP-25 due to loss of forced cooling to main transformer bank (MTB) C-Phase transformer. At 1538, Unit 2 was separated from the grid in accordance with plant OP AP-25 initiation of a main generator unit trip. At 1554 PDT, the Reactor Trip Breakers (RTBs) were manually opened per OP AP-25 Step 24.j. [Reactor] power was being held in Mode 2 at about 3% reactor power per the procedure when the RTBs were opened.
The investigation into the cause is continuing. This event is being reported in accordance with 10 CFR 50.72(b)(2)(xi), Offsite Notification, as Pacific Gas and Electric plans to make a news release regarding the event that may raise media interest. The licensee notified the NRC Resident Inspector. |
Where | |
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Diablo Canyon California (NRC Region 4) | |
Reporting | |
10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
Time - Person (Reporting Time:+-0.4 h-0.0167 days <br />-0.00238 weeks <br />-5.4792e-4 months <br />) | |
Opened: | Anthony Chitwood 21:49 Jun 30, 2009 |
NRC Officer: | Vince Klco |
Last Updated: | Jun 30, 2009 |
45178 - NRC Website
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Unit 2 | |
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Reactor critical | Critical |
Scram | Yes, Manual Scram |
Before | Power Operation (100 %) |
After | Hot Standby (0 %) |
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