ENS 43047: Difference between revisions

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| event date = 12/12/2006 13:22 PST
| event date = 12/12/2006 13:22 PST
| last update date = 12/12/2006
| last update date = 12/12/2006
| title = Circulating Water Pump Failure Causes Explosion In Intake Structure
| title = Circulating Water Pump Failure Causes Explosion in Intake Structure
| event text = On December 12, 2006, at 1322 PST, while conducting power ascension operations with Unit 2 at approximately 25 percent power, an electrical failure occurred in the Unit 2 circulating water pump motor enclosure (CWP) 2-1. A loud bang and explosion was reported to the Unit 2 control room. At 1322 PST, an electrical transient was experienced on Unit 2 12-Kv non-vital bus 'D' which in turn caused reactor coolant pump (RCP) 2-2 and RCP 2-4 motor breakers to trip on 12kV non-vital bus 'D' undervoltage, initiating an automatic reactor trip. The reactor trip signal was initiated when 2 out of 4 RCP motor breakers opened. All control rods fully inserted in response to the reactor trip and all plant systems functioned as required. The auxiliary feedwater system for Unit 2 was manually actuated per plant procedures, before an auto-start signal for this system was generated. At 1356 PST, DCPP Fire Department first responders reported that the fire was out.  
| event text = On December 12, 2006, at 1322 PST, while conducting power ascension operations with Unit 2 at approximately 25 percent power, an electrical failure occurred in the Unit 2 circulating water pump motor enclosure (CWP) 2-1. A loud bang and explosion was reported to the Unit 2 control room. At 1322 PST, an electrical transient was experienced on Unit 2 12-Kv non-vital bus 'D' which in turn caused reactor coolant pump (RCP) 2-2 and RCP 2-4 motor breakers to trip on 12kV non-vital bus 'D' undervoltage, initiating an automatic reactor trip. The reactor trip signal was initiated when 2 out of 4 RCP motor breakers opened. All control rods fully inserted in response to the reactor trip and all plant systems functioned as required. The auxiliary feedwater system for Unit 2 was manually actuated per plant procedures, before an auto-start signal for this system was generated. At 1356 PST, DCPP Fire Department first responders reported that the fire was out.  
At 1340 the licensee declared a Notice of Unusual Event (NUE), number 23, 'Confirmed Explosion Onsite'.
At 1340 the licensee declared a Notice of Unusual Event (NUE), number 23, 'Confirmed Explosion Onsite'.

Latest revision as of 21:17, 1 March 2018

ENS 43047 +/-
Where
Diablo Canyon Pacific Gas & Electric icon.png
California (NRC Region 4)
Reporting
Emergency class: Unusual Event
10 CFR 50.72(a) (1) (i), Emergency Class Declaration

10 CFR 50.72(b)(2)(iv)(B), RPS Actuation

10 CFR 50.72(b)(3)(iv)(A), System Actuation
LER: 05000323/LER-2006-004
Time - Person (Reporting Time:+-4.38 h-0.183 days <br />-0.0261 weeks <br />-0.006 months <br />)
Opened: Tony Chitwood
16:59 Dec 12, 2006
NRC Officer: Pete Snyder
Last Updated: Dec 12, 2006
43047 - NRC Website
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