ENS 49143: Difference between revisions

v t e ENS Event
04:20 Jun 24, 2013
Title	Loss of 230 Kv Offsite Power Results in the Automatic Start of Emergency Diesel Generators
Event Description	At 2120 PDT, Diablo Canyon Power Plant experienced a loss of the offsite 230 kV startup power source due to an offsite transmission system relay actuation, resulting in valid anticipatory starts of Units 1 and 2 three emergency diesel generators on each unit. All diesels successfully started but were not loaded. All systems operated as designed with no problems observed. The 230 kV startup power source is the only offsite power system designed to be immediately available following an accident. However, the safety related onsite emergency diesel system would have provided power to mitigate the consequences of an accident while the 230 kV was unavailable. Restoration of the 230 kV offsite power system is in progress." The licensee will notify the NRC Resident Inspector. * * UPDATE FROM MICHAEL KENNEDY TO HOWIE CROUCH AT 1618 EDT ON 8/21/13 * * * 230 kV was restored to Operable on 06/24/13 at 0200 PDT. Normal 500 kV Offsite Power remained operable and was unaffected by this event. Following further review, Diablo Canyon Power Plant (DCPP) has determined that the loss of the 230 kV system was not a condition that could have prevented fulfillment of the safety function of a system credited to mitigate the consequences of an accident. This power source is not considered to be a safety-related system that is credited to mitigate any accident as described in the DCPP UFSAR, Chapters 6 and 15 accident analyses. PG&E concludes that the emergency diesel generators are the only power source needed to fulfill the accident mitigation function, and they did not become inoperable as a result of this event. The licensee will be notifying the NRC Resident Inspector. Notified R4DO (Werner).

ENS 49143 +/-
Where
Diablo Canyon California (NRC Region 4)
Reporting

10 CFR 50.72(b)(3)(iv)(A), System Actuation
Time - Person (Reporting Time:+0.25 h0.0104 days <br />0.00149 weeks <br />3.4245e-4 months <br />)
Opened:	Adam Peck 04:35 Jun 24, 2013
NRC Officer:	Vince Klco
Last Updated:	Aug 21, 2013
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v • d • e

v t e Emergency Notification System
Diablo Canyon with 10 CFR 50.72(b)(3)(iv)(A), System Actuation
WEEKMONTHYEAR2023-10-01T03:14:00 [Table view]
[ENS list for Diablo Canyon]

@@ Line 16: / Line 16: @@
 | event date = 06/23/2013 21:20 PDT
 | last update date = 08/21/2013
-| title = Loss Of 230 Kv Offsite Power Results In The Automatic Start Of Emergency Diesel Generators
+| title = Loss of 230 Kv Offsite Power Results in the Automatic Start of Emergency Diesel Generators
 | event text = At 2120 PDT, Diablo Canyon Power Plant experienced a loss of the offsite 230 kV startup power source due to an offsite transmission system relay actuation, resulting in valid anticipatory starts of Units 1 and 2 three emergency diesel generators on each unit.  All diesels successfully started but were not loaded.  All systems operated as designed with no problems observed.
 The 230 kV startup power source is the only offsite power system designed to be immediately available following an accident.  However, the safety related onsite emergency diesel system would have provided power to mitigate the consequences of an accident while the 230 kV was unavailable.

v t e Unit 1
W-4-LP
Reactor critical	Critical
Scram	No
Before	Power Operation (100 %)
After	Power Operation (100 %)

v t e Unit 2
W-4-LP
Reactor critical	Critical
Scram	No
Before	Power Operation (100 %)
After	Power Operation (100 %)

ENS 49143: Difference between revisions

Latest revision as of 21:00, 1 March 2018

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ENS 49143: Difference between revisions

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