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Re: E-M:/ Fwd: Cook Reactor Shutdown due to high temperature



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Enviro-Mich message from jmgear <jmgear@acd.net>
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I imagine Kay knows, but just in case others don't, hot standby refers to a reactor plant being kept at or near NOT/NOP (normal operating temperature and pressue) with the reactor itself shut down. Keeping a plant in HS makes it much faster to bring it back on line and generating electricity (otherwise you have to do a long and laborious heatup once you start the reactor)..

Kay Cumbow wrote:

"Hot standby" (which occurs in the phrase describing reactor status, before /Event Text/,) appears to take on a double meaning here. Global warming seems not to be so very good for nuclear power plants.

-Kay Cumbow, Director, Citizens for Alternatives to Chemical Contamination


From: "Thomas Keegan" <mkeeganj@comcast.net>


Subject: Cook Reactor Shutdown Date: Mon, 31 Jul 2006 10:05:52 -0500


Power Reactor Event Number: 42739 Facility: COOK Region: 3 State: MI Unit: [1] [ ] [ ] RX Type: [1] W-4-LP,[2] W-4-LP NRC Notified By: BRAD LEWIS HQ OPS Officer: JOHN KNOKE Notification Date: 07/30/2006 Notification Time: 11:15 [ET] Event Date: 07/30/2006 Event Time: 07:30 [EDT] Last Update Date: 07/30/2006 Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(2)(i) - PLANT S/D REQD BY TS Person (Organization): ANNE MARIE STONE (R3)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 M/R Y 100 Power Operation 0 Hot Standby


*Event Text*
TECHNICAL SPECIFICATION SHUTDOWN FOR HIGH CONTAINMENT AIR TEMPERATURE

"On July 30, 2006, at 0730, a plant shutdown was initiated in accordance with Technical Specification (TS) Action 3.6.5.B.1. This action requires that the unit be placed in Mode 3 within six hours if containment air temperature is not restored to within limits during the previous eight hours.

"On July 29, 2006, at 2026 TS Action 3.6.5.A was entered due to containment lower compartment average air temperature exceeding the TS Limiting Condition for Operation 3.6.5.B limit of 120 degrees Fahrenheit. Efforts to reduce the containment temperature during the eight hour completion time of Action 3.6.5.A were unsuccessful.

"In accordance with normal plant operating procedures, the unit shutdown was completed by initiating a manual reactor trip from 16.5% Reactor Power following a controlled plant shutdown on July 20, 2006, at 1014. All safety systems and plant equipment used in the shutdown functioned as designed."

All rods inserted fully without incident. No PORV/safety valves lifted. Decay heat is being removed with AFW. Unit 2 containment air temperature is 117 degrees Fahrenheit.

The licensee notified the NRC Resident Inspector.



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