ENS 44675

v t e ENS Event
19:08 Nov 21, 2008
Title	Offsite Notification and Media Briefing Due to Potential Discovery of Offshore Fault Near Plant
Event Description	As part of the ongoing seismic monitoring program, PG&E [Pacific Gas & Electric] in conjunction with the US Geological Survey (USGS) is studying a pattern of seismic activity in close proximity to the Diablo Canyon Power Plant (DCPP). The discovered pattern of seismic activity suggests a potential offshore fault near DCPP. PG&E and the USGS were previously unaware of this potential fault. Initial evaluation shows that the potential fault is closer to DCPP and much smaller than the Hosgri fault, which is the current bounding seismic feature for DCPP. Initial assessment indicates that the ground motion from this potential fault is expected to be bounded by the existing seismic design basis for DCPP. The possible impact of this potential fault, including potential ground deformation is the subject of an ongoing evaluation. Given the available data, PG&E and the USGS estimate that it will take up to a year to determine if a seismic fault exists. This issue was discussed with US NRC Region IV and Office of US NRC Nuclear Reactor Regulation on November 21, 2008. PG&E is planning a media briefing. The licensee has notified the NRC Resident Inspector.

ENS 44675 +/-
Where
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:+-5 h-0.208 days <br />-0.0298 weeks <br />-0.00685 months <br />)
Opened:	Murrell Evans 14:08 Nov 21, 2008
NRC Officer:	Howie Crouch
Last Updated:	Nov 21, 2008
44675 - NRC Website
v • d • e

v t e Emergency Notification System
Diablo Canyon with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release
WEEKMONTHYEAR2018-12-01T08:00:00 [Table view]
[ENS list for Diablo Canyon]

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