Industrialized Cyclist Notepad


Salem nuclear plant

While worriers worried about Oyster Creek, several plants in the path of the storm experienced “events.” Salem: atmospheric steam dump…

NRC: Current Event Notification Report for October 30, 2012

MANUAL REACTOR TRIP FROM 100% POWER

“This report if being made under the requirements of 10 CFR 50.72(b)(2)(iv)(B), Actuation of the Reactor Protection System While Critical, except preplanned, and under the requirements of 10 CFR 50.72(b)(3)(iv)(A), Valid Actuation of Listed System, except preplanned.

“Salem Unit 1 was operating at 100% reactor power when a loss of 4 condenser circulators required a manual reactor trip in accordance with station procedures. The cause of the 4 circulators being removed from service was due to a combination of high river level and detritus from Hurricane Sandy’s transit.

“All control rods inserted. A subsequent loss of the 2 remaining circulators required transition of decay heat removal from condenser steam dumps to the 11-14 MS10s (atmospheric steam dump). Decay heat removal is from the 11/12 Aux Feed Pumps to all 4 steam generators via the 11-14 MS10s. 11/12/13 AFW pumps started due to low level on all steam generators due to shrink from full power operation (this is a normal response). All safety related equipment functioned as expected. No one has been injured. As an additional note, Hurricane Sandy had recently moved past artificial island. Salem Unit 1 is currently in Mode 3. Salem Unit 2 reactor is currently in its 2R19 refueling outage and is shutdown and defueled with no fuel movement in progress.”

via NRC: Current Event Notification Report for October 30, 2012.



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



Reactor 4 demands our attention

Via EX-SKF: #Fukushima I Nuke Plant: Reactor 4 to Get a Cover and a Crane | EXSKF.

Which dude said, Hey, let’s put the spent fuel pool on the roof of the reactor building. Are the US reactors like that as well (except with far more spent fuel)? Ack.

It would be good to remove the material from the spent fuel pool before it all collapses in a heap. Currently the crane is crumpled in the pool itself. So a new crane will be needed, and a structure to support it. Here are the plans for such released today:



The Tubes of San Onofre

Thousands of brittle tubes. Seems like a bad plan.

The Nuclear Regulatory Commission said Thursday it was sending a special team of inspectors to try to determine why the metal tubes, which were installed in Unit 3 in 2010, have become frail enough to pose a risk of leaks.

“This is a significant issue,” said NRC spokeswoman Lara Uselding. “A tube rupture is really the concern.”

Investigators have been looking into excessive wear on tubes in Unit 3 and its twin, Unit 2, which has been off line for maintenance and refueling. In a $670 million overhaul, two huge steam generators, each containing 9,700 tubes, were replaced in Unit 2 in fall 2009 and a year later in Unit 3.

via 4 more tubes fail in tests at Calif. nuke plant – BusinessWeek.




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