28 juillet 2014
Du 20 au 27 juillet 2014, les conditions météorologiques ont entrainé le dépassement des 37,78°C réglementaires. La NRC a donné son autorisation pour fonctionner jusqu’à 39,44°C. Vu les prévisions météo, la puissance du réacteur n° 4 a été abaissée à 95 %, puis à 75 % et celle du réacteur n° 3 à 75 %.
Type : PWR - Puissance : 2 300 MWth - Première divergence n° 3 : 10/1972 ; n° 4 : 06/1973
Available in english only.
Event Number : 50287
Facility : TURKEY POINT - State : FL - Unit : [3] [4] - RX Type : [3] W-3-LP,[4] W-3-LP
Event Date : 07/20/2014 - Event Time : 14:54
Emergency Class : NON EMERGENCY 10 CFR Section : 50.72(b)(3)(v)(B) - POT RHR INOP
Initial PWR Current PWR 3 N Y 100 Power Operation 100 Power Operation 4 N Y 100 Power Operation 95 Power Operation
Event Text
ULTIMATE HEAT SINK TEMPERATURE EXCEEDED TECHNICAL SPECIFICATION LIMIT
"At 1454 EDT on 20 July 2014, Turkey Point Units 3 and 4 entered the Action for Technical Specification (TS) 3.7.4, Ultimate Heat Sink (UHS). The action was entered because UHS temperature exceeded the limit of 100 degrees F due to a natural event. This report is in accordance with 10CFR50.72(b)(3)(v)(B) because UHS capability to remove residual heat is impacted. At 1800 EDT the NRC verbally approved a natural event Notice of Enforcement Discretion (NOED) which allows the ultimate heat sink temperature to exceed 100 degrees F up to 103 degrees F. Unit power levels have been maintained at Unit 3 100% and Unit 4 95%.
"The NRC Resident Inspector has been notified."
* * * UPDATE FROM CHRIS TRENT TO DANIEL MILLS AT 2058 EDT ON 7/26/2014 * * *
"At 2046 on 7/20/14, Turkey Point Units 3 and 4 exited the Action for Technical Specification (TS) 3.7.4, Ultimate Heat Sink, when the ultimate heat sink (UHS) temperature decreased below the TS limit of 100 degrees F.
"At 1604 on 7/26/14, Turkey Point Units 3 and 4 entered the Action for TS 3.7.4, Ultimate Heat Sink. The action was entered because UHS temperature exceeded the limit of 100 degrees F. This report is in accordance with 10 CFR 50.72(b)(3)(v)(B) because UHS capability to remove residual heat is impacted. Turkey Point is currently complying with NOED No. 14-2-001, which allows a temporary maximum UHS temperature of 103 degrees F.
"The NRC Resident Inspector was notified."
At 2058 on 7/26/14 the UHS average temperature was 100.3 degrees F and the peak temperature was 100.5 degrees F. Unit 4 is currently operating at 75% power in anticipation of elevated intake temperature in the next several days.
Notified R2DO (Musser)
* * * UPDATE FROM JOSE VASQUEZ TO DANIEL MILLS AT 1913 EDT ON 7/27/2014 * * *
"At 2102 on 7/26/14, Turkey Point Units 3 and 4 exited the Action for Technical Specification (TS) 3.7.4, Ultimate Heat Sink, when the ultimate heat sink (UHS) temperature decreased below the TS limit of 100 degrees F.
"At 1602 on 7/27/14, Turkey Point Units 3 and 4 entered the Action for TS 3.7.4, Ultimate Heat Sink. The action was entered because UHS temperature exceeded the limit of 100 degrees F. This report is in accordance with 10 CFR 50.72(b)(3)(v)(B) because UHS capability to remove residual heat is impacted. Turkey Point is currently complying with NOED No. 14-2-001, which allows a temporary maximum UHS temperature of 103 degrees F.
"The NRC Resident Inspector was notified."
At 1913 on 7/27/14 the UHS average temperature was 101.1 degrees F and the peak temperature was 101.3 degrees F. Units 3 and 4 are currently operating at 75% power in anticipation of elevated intake temperature in the next several days.
Notified R2DO (Musser)
* * *UPDATE PROVIDED BY CHRISTOPHER TRENT TO JEFF ROTTON AT 2103 EDT ON 07/28/2014 * * *
"At 2212 on 7/27/14, Turkey Point Units 3 and 4 exited the Action for Technical Specification (TS) 3.7.4, Ultimate Heat Sink, which was entered at 1602 on 7/27/14, when the ultimate heat sink (UHS) temperature decreased below the TS limit of 100 degrees F.
"At 1445 on 7/28/14, Turkey Point Units 3 and 4 entered the Action for TS 3.7.4, Ultimate Heat Sink. The action was entered because UHS temperature exceeded the limit of 100 degrees F. This report is in accordance with 10 CFR 50.72(b)(3)(v)(B) because UHS capability to remove residual heat is impacted. Turkey Point is currently complying with NOED No. 14-2-001, which allows a temporary maximum UHS temperature of 103 degrees F.
"At 1946 on 7/28/14, UHS temperature decreased below the TS limit of 100 degrees F and Turkey Point Units 3 and 4 exited the Action for Technical Specification (TS) 3.7.4, Ultimate Heat Sink.
’The NRC Resident Inspector was notified."
Peak UHS temperature reached on 7/28/2014 was 101.1 degrees F. Units 3 and 4 are currently operating at 75 percent power in anticipation of continued elevated intake temperatures.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2014/20140729en.html#en50287
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