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U.S. Nuclear Reactors

San Onofre Unit 1

San Clemente, California
Local population: 105,010 (10-mile radius)


Pressurized Water Reactor


Licensed to operate from 03/27/67-11/30/92


Southern California Edison Company

Safety Issues:

Groundwater Leaks Reported, Year Plus Outages

San Onofre nuclear power plant
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Related Links & Documents

06/1981   Fission Stories #115 reported how workers found a key cooling water system for emergency equipment to be partially obstructed by gooseneck barnacles.

09/18/2006   UCS documented the factors leading to the year-plus reactor outage that began in February 1982 in this case study for our Walking a Nuclear Tightrope report.  See details | Download the pdf (1.5 kb)

02/27/1982   Fission Stories #4 explains how maintenance work on a seawater pump begun during low tide opened a hole that caused a whole lot of problems at high tide.