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At 2050 (CDT) on 8/12/10, LaSalle Unit 1 a … At 2050 (CDT) on 8/12/10, LaSalle Unit 1 and Unit 2 commenced a Plant Shutdown. At 1952 (CDT) on 8/12/10, LaSalle Ultimate Heat Sink exceeded the 101.25?F limit per Technical Specification LCO 3.7.3, Condition B. Per Technical Specification LCO 3.7.3, Required Action B.1, both Unit 1 and Unit 2 are to be in Mode 3 (Hot Shutdown) in 12 hours. Per Technical Specification LCO 3.7.3 Required Action B.2, both Unit 1 and Unit 2 are to be in Mode 4 (Cold Shutdown) in 36 hours. Technical Specification LCO 3.7.3, Ultimate Heat Sink requires that both Unit 1 and Unit 2 to be in MODE 3 by 8/13/10 at 0752 (CDT) and MODE 4 by 8/14/10 at 0752 (CDT).</br>Unit 1 was initially at 76% Power due to a response to elevated Main Condenser In-Leakage, not related to the Ultimate Heat Sink High Temperature. Unit 2 was initially at 82% Power due to elevated Condensate Temperature and in response to worsening Main Condenser Backpressure. For Unit 2, both of these parameters were related to the elevated Ultimate Heat Sink Temperature.</br>The Ultimate Heat Sink Temperature is currently 101.33?F. All Systems are responding as expected.</br>This condition is a result of the hot environmental conditions and is not due to any equipment problems or other operating issues at the site.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
00:52:00, 13 August 2010 +
23:50:00, 12 August 2010 +
00:52:00, 13 August 2010 +
At 2050 (CDT) on 8/12/10, LaSalle Unit 1 a … At 2050 (CDT) on 8/12/10, LaSalle Unit 1 and Unit 2 commenced a Plant Shutdown. At 1952 (CDT) on 8/12/10, LaSalle Ultimate Heat Sink exceeded the 101.25?F limit per Technical Specification LCO 3.7.3, Condition B. Per Technical Specification LCO 3.7.3, Required Action B.1, both Unit 1 and Unit 2 are to be in Mode 3 (Hot Shutdown) in 12 hours. Per Technical Specification LCO 3.7.3 Required Action B.2, both Unit 1 and Unit 2 are to be in Mode 4 (Cold Shutdown) in 36 hours. Technical Specification LCO 3.7.3, Ultimate Heat Sink requires that both Unit 1 and Unit 2 to be in MODE 3 by 8/13/10 at 0752 (CDT) and MODE 4 by 8/14/10 at 0752 (CDT).</br>Unit 1 was initially at 76% Power due to a response to elevated Main Condenser In-Leakage, not related to the Ultimate Heat Sink High Temperature. Unit 2 was initially at 82% Power due to elevated Condensate Temperature and in response to worsening Main Condenser Backpressure. For Unit 2, both of these parameters were related to the elevated Ultimate Heat Sink Temperature.</br>The Ultimate Heat Sink Temperature is currently 101.33?F. All Systems are responding as expected.</br>This condition is a result of the hot environmental conditions and is not due to any equipment problems or other operating issues at the site.</br>The licensee has notified the NRC Resident Inspector.e has notified the NRC Resident Inspector. +
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00:00:00, 13 August 2010 +
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02:08:59, 2 March 2018 +
23:50:00, 12 August 2010 +
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00:52:00, 13 August 2010 +
Technical Specification Required Shutdown Due to Environmental Conditions Resulting in Elevated Ultimate Heat Sink Temperature +
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