[PDF] - FAR OUTSIDE THE NORM: The San Onofre Nuclear Plants Steam Generator PDF Document

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FAR OUTSIDE THE NORM: The San Onofre Nuclear Plant’s Steam Generator Problems in the Context of the National Experience with Replacement Steam Generators

by

Daniel Hirsch and Dorah Shuey with a Foreword by Dale Bridenbaugh

September 12, 2012

http://www.committeetobridgethegap.org

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FOREWORD

SAN ONOFRE NUCLEAR GENERATING STATION REPLACEMENT STEAM GENERATOR PROBLEMS by

DALE BRIDENBAUGH NUCLEAR ENGINEER, RETIRED

As a retired professional nuclear engineer and long time citizen of California, I have followed the recent experience of the San Onofre Nuclear Generating Station with great interest. I am particularly troubled by the extent and causes of the early failures of tubes in the replacement steam generators at both of the San Onofre units (Units 2 and 3) that have not yet been thoroughly explained and reported. As this report makes clear, the conflicting failure data thus far made available by the San Onofre operating utility and the Nuclear Regulatory Commission, along with the lack of specificity detailing the mode(s) of failure, lend little credibility to Southern California Edison’s claims that the large number of damaged steam generator tubes and indications of wear on the tubes are in fact completely understood. The data assembled in this report call into question assertions that the San Onofre damage is due primarily to normal “settling in” found commonly in other new replacement steam generators and that no immediate corrective action is needed before the restart of Unit 2. As dramatically shown in Figures 3, 4, and 5 of this report, the San Onofre experience after only two or less years of operation with replacement steam generators lies far outside the bounds of normality when compared to the experience of other nuclear units with such replaced

components. Steam generators, and more specifically the tube boundaries, play a critical role in

assuring plant safety and the containment of possible radioactive releases. In spite of Edison’s attempt to assert a different level of risk between Units 2 and 3, it seems clear that similar design and failure challenges are present in both units and that future operation of either unit has not been technically justified. It is my opinion that measures necessary for the future safe operation

f either of these unit have not been adequately put forth at this time, and that operation with or

without reduced power of Unit 2 should not be authorized. ii

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DANIEL HIRSCH is President of the Committee to Bridge the Gap and has been associated with it since 1970. He is also a Lecturer at the University of California, Santa Cruz, where he teaches courses on Nuclear Policy and Environment Policy. He is the former Director of the Adlai E. Stevenson Program on Nuclear Policy at UCSC. DORAH ROSEN is a Research Associate with the Committee to Bridge the Gap. She had primary responsibility for acquiring and compiling the steam generator tube data from licensee ISI reports and related documentation. DALE BRIDENBAUGH is a retired Nuclear Engineer with forty years experience with the commercial nuclear industry. He was a nuclear engineer and manager for General Electric’s Nuclear Division, spending twenty years with GE. In 1976, he and two colleagues resigned from GE and testified before Congress regarding their concerns that safety issues with the GE Mark I containment structures were being ignored. The subsequent Fukushima nuclear accident tragically proved them correct. After their resignation from GE, the three nuclear engineers formed MHB Associates, which for more than twenty years performed studies on the operation, safety and costs of nuclear plants for state agencies and foreign countries. THE COMMITTEE TO BRIDGE THE GAP is a forty-two-year-old non-profit public policy

rganization focused on issues of nuclear safety, proliferation, waste disposal, and terrorism.

www.committeetobridgethegap.org (831) 336-8003 D-1