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

 "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
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):

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

"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.