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Nuclear Event – Automatic Reactor Trip: Watts Bar Nuclear Plant Unit 1


North America – USA | State of Tennessee, Rhea County, Spring City, Watts Bar Nuclear Plant
Location: 35°36’10.0″N 84°47’22.0″W
Present Operational Age: ~30 years

Nuclear Event in USA on Tuesday, 22 March, 2016 at 11:31 [EDT].


“On March 22, 2016, at 1131 EDT, the Watts Bar Nuclear Plant Unit 1 (WBN1) reactor tripped due to the actuation of the Over Temperature Delta Temperature bistables. Concurrent with the reactor trip, the Auxiliary Feedwater (AFW) system actuated. All control rods inserted upon the reactor trip. Engineered Safety Function systems functioned as expected.

“WBN1 is currently stable in Mode 3. The Reactor Coolant system is being maintained at normal operating pressure and no-load temperature with decay heat removal via the Main Condenser steam dumps and the AFW system. The station is in a normal shutdown electrical alignment. Watts Bar Unit 2 is in mode 4 preparing for power ascension testing and was unaffected by the WBN1 event.

“The cause of the event is under investigation. This event is being reported pursuant to 10 CFR 50.72(b)(2)(iv)(B) and 10 CFR 50.72(b)(3)(iv)(A).”

The NRC Resident Inspector has been notified.

Source: NRC  Event Number: 51815


Previous Events

Nuclear Event in USA on Thursday, 17 March, 2016 at 01:15 [EDT]. LOSS OF EMERGENCY AND AUXILIARY GAS TREATMENT SYSTEMS – UNIT 1

Nuclear Event in USA on Wednesday, 09 March, 2016 at 03:42 [EST]. UNUSUAL EVENT DECLARED DUE TO A FIRE GREATER THAN 15 MINUTES – UNIT 2

Of Interest

NRC – Watts Bar Unit 2 Reactivation, Updated Monday, April 06, 2015
NRC: Event Notification Report for October 31, 2014

Boone Dam HazardOngoing Hazard Alerts

Boone Lake levels continue to be low due to seepage issues near the dam.  TVA (23 March 2016)

Majority of Boone Dam work occurring underground –

Boone Reservoir Dam, State of Tennessee
Location: 36°26′25″N 082°26′18″W
Present Operational Age: ~63 years
Damage Level: Critical

Boone Dam is a concrete gravity-type dam 160 feet (49 m) high and 1,532 feet (467 m) long, and has a generating capacity of 81,000 kilowatts. While the main section of the dam is a concrete structure, the northern half of the dam consists of a 750-foot (230 m) earth-and-fill structure that seals off the floodplain adjacent to the main river channel. Its flood storage capacity is an estimated 93,534,000 m3, which is 24,709,068,524 US gal.

Downstream Facilities:

Boone Dam, Tennessee

Sequoyah Nuclear Generating Station, Tennessee: 35°13′35″N 85°5′30″W
Watts Bar Nuclear Generating Station, Tennessee: 35°36’10.0″N 84°47’22.0″W
Browns Ferry Nuclear Generating Station, Alabama: 34° 42.233 N,  87° 7.117 W

TVA Maps

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