|Nuclear Experts Agree, San Onofre’s Replacement Steam Generators Are Unsafe|
Summation: Based upon our ongoing review of evaluations, engineering analyses, inspections, technical and operational assessment reports prepared by the NRC’s Augmented Inspection Team, MHI, SCE, Westinghouse, AREVA, Professor Daniel Hirsch, industry experts and knowledgeable whistle blowers, along with the recent affidavits prepared by Arnie Gundersen and John Large, we reaffirm the following statements which have been previously substantiated in numerous DAB Safety Team Documents
1. The DAB Safety Team has been saying for months for a long time that SCE and MHI Engineers did a very poor job in their review of Academic Research Papers and Industry Comparisons about how to prevent the adverse effects of fluid elastic instability in the design of San Onofre's replacement steam generators because the original Combustion Engineering designed steam generators did not experience the adverse effects of fluid elastic instability. Nuclear Expert, John Large statesA, “I have little confidence in the outcome of AREVA’s projection of the time period through which the U2 nuclear plant could be reliably expected to operate without incurring a tube failure or running at a greater risk of a tube failure occurring. ... In my opinion, simply sweeping the fluid elastic instability issue under the carpet on the basis ... it will not reoccur at 70% power is not only disingenuous but foolhardy.” TheNRC chairman has publicly stated, “SCE is responsible for the work of its vendor and its contractor.” DAB Safety Team alleges that SCE actions are in violation of the Federal Regulations, its CPUC Charter, the NRC Chairman Standards and even its own advertised charter of “Overriding Obligations to Shareholders and Public Safety.”
2. Accidents involving steam generator depressurization (main steam line break), station blackout and other anticipated transient events causing steam generators over-pressurization can occur at any time over the full range of normal operating conditions up to Reactor Thermal Power (3438 MWs). Therefore BY DESIGN, these replacement steam generators are NOT capable of protecting their already worn and cracked tubes from radioactive leakages and/or ruptures caused by the above.
3. In Unit 2, these already fatigued, cracked, and heavily degraded tubes can snap, leak and/or rupture at the tube sheet, tube support plate or the unsupported anti-vibration bars mid and free spans during these postulated adverse accident conditions. John Large statesA, “For the MSLB event very high, two-phase fluid cross-flow velocities would be expected to instantaneously develop in the U-bend region, triggering vigorous FEI that could, particularly if the AVB restraints are ineffective, promote violent tube to tube clashing and the potential for a multiple tube failure event.”
4. It is ABSOLUTELY CLEAR, that San Onofre Unit 2 replacement steam generators will likely experience single to multiple tube-to-tube failures (e.g., San Onofre Unit 3, Mihama Unit 2, North Anna, Indian Point 2 and Craus, France, etc.) during these postulated adverse licensed conditions at any power level up to 100% Power (Licensed Reactor Thermal Power of 3438 MWTs).
5. The proposed Defense-in-Depth instrumentation, along with unreliable and unproven operator actions to detect multiple tube leaks/ruptures and/or to re-pressurize the steam generators during these postulated adverse licensed conditions as claimed by Edison are not practical to stop a major nuclear accident from progressing and causing a Unit 2 meltdown.
6. There are conflicting, contradicting, ambiguous and confusing findings between the experts in the Unit 2 Operational Assessments: Such conflicting disagreements over the cause of Tube To Tube Wear reflects poorly on the depth of understanding of this crucially important FEI issue by SCE, each of these SCE consultants and the designer/manufacturer of the Replacement steam generators. The DAB Safety Team’s findings contradict the SCE and all the three NEI qualified, “US Nuclear Plant Designers” findings about Unit 2 FEI (See, Overview – Consequences of a Main Steam Line Break
7. The DAB Safety Team Comments about SCE 10 CFR 50.59 Safety Evaluation for RSGs: The Big Number 1 Attachment Notes
shows the comparison between San Onofre and Palo Verde's Replacement Steam Generator design parameters. Palo Verde has the largest CE RSGs in the world (~ 800 Tons each) and SONGS Replacement Steam Generators are the second largest CE Replacement Steam Generators in the world (~ 620 Tons each). John Large statesA, “In my opinion, the changes, tests and experiments (CTE) inherent in the SCE proposal to restart Unit 2: (a) involve a significant increase in the probability or consequences of an accident previously evaluated; (b) create the possibility of a new or different kind of accident previously evaluated; and (c) involve a significant reduction in a margin of safety. Arnie Gundersen statesB, “It is my professional opinion that Edison should have applied for the 50.59 process so that the FSAR license amendment evaluation and public hearings would have occurred six years ago, prior to creating an accident scenario and facing losses that by the end of this process will easily total more than $1 Billion.” Therefore, the DAB Safety Team concludes that SCE claims as stated are not factual. SCE did not meet the 10CFR50, Appendix B, Quality assurance Standards and has violated the NRC 10 CFR 50.90 Regulations.
8. The Public expects that the Offices of Nuclear Reactor Regulation (NRR) comply with President Barack Obama, Senator Barbara Boxer and NRC Chairman’s Open Government Initiative. Under no circumstances should the NRR permit SCE to restart unit 2 without replacing the defective replacement steam generators, a full NRC 50.90 Licensing Amendment and transparent trial-like public hearings.
Full Media Alert 13-01-15 Allegation - SCE Violated Federal Reg's And The Public Trust
is posted on the web at this link: DAB SafetyTeam Documents
The DAB Safety Team: Don, Ace and a BATTERY of safety-conscious San Onofre insiders plus industry experts from around the world who wish to remain anonymous. These volunteers assist the DAB Safety Team by sharing knowledge, opinions and insight but are not responsible for the contents of the DAB Safety Team's reports. We continue to work together as a Safety Team to prepare additional: DAB Safety Team Documents, which explain in detail why a SONGS restart is unsafe at any power level without a Full/Thorough/Transparent NRC 50.90 License Amendment and Evidentiary Public Hearings. For more information from The DAB Safety Team, please visit the link above.
Our Mission: To prevent a Trillion Dollar Eco-Disaster like Fukushima, from happening in the USA.
Copyright January 14, 2013 by The DAB Safety Team. All rights reserved. This material may not be published, broadcast or redistributed without crediting the DAB Safety Team. The contents cannot be altered without the Written Permission of the DAB Safety Team Leader and/or the DAB Safety Team’s Attorney