Yankee Rowe (USA)

Map of Yankee Rowe

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200 MW PWR; constructed by Westinghouse; shutdown 1992.

Facilities in Yankee Rowe

plantreactor typconstruction startoperation startshut down
Yankee RowePWR195719601992
1996-09-05

Furthermore a NRC inspection from April 1996 concluded in its last months' report that safety margins at the plant were small, that ananlyses to ensure the design of safety systems were either incorrect or incomplete, and that the defense in depth principles may be compromised.
The plant has been one of the more expensive NPPs with 29 mills/kWh in the 1993-95 period, while the industry average was 24,4 mills/kWh.
Several years ago the owner Northeast Utilities said it would shut the plant rather than spend US$150 million for new SGs. NU could now prematurely shut it down, if expensive repairs are required.

1996-03-18

Two environmental groups have appealed an NRC Atomic Safety & Licensing Board (ASLB) ruling that said they have standing, but lack admissible contentions to intervene in the decommissioning of Yankee Atomic Electric Co.'s (YAEC) Yankee Rowe nuclear plant.
If it stands, the ruling means there will be no formal public hearing on the ongoing decommissioning.
Diane Curran, lawyer for the Citizens Awareness Network (CAN) and the New England Coalition on Nuclear Pollution, filed the appeal March 18 asking the NRC commissioners to review the ASLB decision. The groups based their petition on five major contentions and are appealing the ASLB´s ruling on each.
Last year, the US First Circuit Court of Appeals ruled the commission had erred in not providing CAN the opportunity for a hearing, and the NRC ordered YAEC to halt further "major decommissioning activities" at Yankee. YAEC had already removed large components of the plant under a process that didn't require prior NRC review and approval.
YAEC is decommissioning the plant under a modified Decon method rather than the Safstor option its opponents say they favor, which would delay dismantling.
The environmental groups claimed that YAEC´s proposed decommissioning plan: fails to maintain occupational and public radiation doses as low as is reasonably achievable; fails to adequately describe planned decommissioning activities or controls and limits on procedures and equipment; and doesn't comply with NRC regulations funding requirements. The groups also charged that the NRC staff violated the National Environmental Policy Act (NEPA) by failing to prepare a supplemental environmental impact statement in connection with the approval of the decommissioning plan.

1995-04-20

Yankee will step up decommissioning activities if South Carolina extends the life of Barnwell LLW facility and reopens it to out of region generators.
RPV is scheduled to be removed in summer 1996 in a disposal cask and filled with concrete [8,4 x 3,3 m - 400 tons] The packaged vessel will be shipped in one piece just as the 4 SG have been a year ago under a large component removal program, which cost US$ 20 million. Systems already removed include the SIT, SG blowdown system, charging pumps. Purification system, shutdown cooling system and their piping are currently being dismantled. After completion of the large component removal program about 3200 m³ LLW will be remaining on the site: decommissioning cost were estimated to about 370 million US$ (in Nov.1994)

1991-10-01

Shutdown: this is the latest twist in a monthslong battle over whether the 31-year-old embrittled RPV is capable of withstanding a serious accident. New procedures to be used during a small-break LOCA would reduce by a factor of 20 the chances that the vessel would fail, said the company. Running 2 of the 4 main coolant pumps during a small-break LOCA would significantly reduce the chances the vessel would fail in a pressurized thermal shock, because the mixing of relatively warmer coolant with the cold safety injection water, would reduce the stress to the vessel wall. The Union of Concerned Scienists, which first raised the embrittlement issue, argues that the pumps are not qualified to work under accident conditions and cannot be powered from EDGs. NRC also found reasons for shutting the reactor: the calculations of the likelihood of vessel failure from PTS are not conservative.

1991-06-15

A lightning strike resulted in fire in a transformer. Loss off offsite -power, loss of vital buses and loss of comunication ... -> scram.

1991-02-26

Defective wiring crimps were found on all 3 EDGS. Could have prevented the EDGS from operating.

1991-01-02

A newly installed EDG failed to start. Failure resulted from an inadequately crimped butt splice. Cond. existed since the 1990 refueling outage.