Industrialized Cyclist Notepad


Four reactors shut down on East Coast

Constellation Nuclear Energy Group’s 630-megawatt Nine Mile Point 1 nuclear reactor in New York automatically shut on Tuesday due to high neutron flux — meaning neutrons are not equally spread around the reactor core. Power traders guessed it could have been a faulty sensor and the unit could be back soon.

Constellation Nuclear is a venture between French power company Electricite de France SA (EDF) and Chicago power company Exelon Corp.

A unit at Exelon’s Limerick nuclear plant in Pennsylvania shut early Wednesday, according to power traders. Officials at the company and the U.S. Nuclear Regulatory Commission could not confirm the Limerick shutdown.

Constellation Nuclear 855-MW took the Unit 1 at the Calvert Cliffs nuclear plant in Maryland offline by early Wednesday due to a small leak in an instrument line. The company said it had already fixed the plant and was ramping up the unit.

North Carolina-based Duke Energy’s 846-MW Unit 1 at the Oconee nuclear plant in South Carolina also shut by early Wednesday. Details about the Oconee shutdown were not immediately available to comment.

via Four U.S. power reactors shut & NYC sweats during heat wave – CNBC.



Leak found at Davis Besse Nuclear Power Plant last week

While we’re on the subject of super old and leaky nuke plants. This plant’s near Toledo, and is also up for a controversial license renewal.

During the performance of MODE 3 engineering walkdown inspections in accordance with procedure DB-PF-03010 (ASME Section III, Class 1 and 2), with the RCS at Normal Operating Temperature and Pressure, a pressure boundary leak was identified on the Reactor Coolant Pump (RCP) 1-2 1st seal cavity vent line upstream weld of 3/4 inch small bore pipe socketweld at a 90 degree elbow between the RCP pump and valve RC-407 (1st Seal Cavity Vent Isolation). The plant was in MODE 3 at Normal Operating Pressure and Normal Operating Temperature (NOP/NOT) for the inspections.

“The plant entered Technical Specification (TS) Limiting Condition for Operation (LCO) 3.4.13, ‘RCS Operational Leakage,’ Condition B and procedure DB-OP-02522. ‘Small RCS Leaks,’ abnormal operating procedure. Plant cooldown to comply with LCO 3.4.13, Condition B, Required Action B.2 is in progress. The cause and resolution are under evaluation.

via Leak found at Davis Besse Nuclear Power Plant during restart from month-long outage | Enformable.



50-mile radius around Palisades nuke plant

…which is leaking, perhaps exploding, etc.

The 41-year-old plant’s license was due to expire, but in 2007 the NRC granted a 20-year extension.


click to enlarge
Via the Palisade license-renewal application (pdf): http://www.nrc.gov/reactors/operating/licensing/renewal/applications/palisades/palisades_er.pdf




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