Reactor Decommissioning History
San Onofre Unit 1 (SONGS-1)
revised 8/15/05

Overview

SONGS-1 was a commercial PWR power reactor. It had a generating capacity of 450 MWe and 1347 MWt. It operated from January 1968 to November 1992. It was decommissioned while Units 2 and 3 were operating. Decommissioning began 1999 and is expected to last until 2008.

Reactor Decommissioning Specifics

Internals Removal
All work was performed underwater. Abrasive Water Jet (AWJ) and Metal Disintegration Machining (MDM) were primarily used. Some long handle tools were also used for mechanical work such as unbolting and manipulating. The AWJ was used to remove larger components (such as the Baffle Plates) and to size reduce them for packaging. Several MDM tools were used to help remove components (such as removing bolt heads). All work on the internals was done remotely. All work on the internals was done by PCI Energy Services.

Reactor Vessel Removal
The reactor pressure vessel was removed whole with a cover where the head had been. This assembly was shipped off-site inside a custom made canister. The reactor head was shipped separately. It is not known which company cut the piping to free the reactor vessel. Bigge Power Constructors provided the rigging services.

Segmentation and Packaging Plan (S&P Plan)
Pre-site: PCI Energy Services; Fred Frank, Jim Jesko, George Knetl, Steve Larson.
At site: PCI Energy Services?

Key People
Jim Jesko was the on-site Project Manager for PCI Energy Services.

Contractors
Bechtel.
Bigge Power Constructors.
PCI Energy Services.
WMG.

Comments
This was one of three underwater internals segmentations done in the USA using Abrasive Water Jet as the primary cutting tool. PCI had done Abrasive Water Jet cutting of the Connecticut Yankee (Haddam Neck) reactor internals previous to this.

Related Publications and Documents
No published technical papers have been found relating to the decommissioning of this reactor or segmentation of the reactor internals.

References
NRC's "Fact Sheet on Decommissioning Nuclear Power Plants" (web page 8/15/05).
Southern California Edison's web page as of 8/12/05.
Bigge Power Constructors' web page as of 8/12/05.
PCI Energy Services' web page 8/12/05.
Steve Larson interview 8/12/05.

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