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NPS_Watch Jun 05, 2018
#1
The Daily Dose - Exposing the nuclear power industry while the nuclear power industry exposes you.


There are 2 EN(s) today, 1 associated with power stations.

[]

NRC Event Notices for June 05, 2018    
https://www.nrc.gov/reading-rm/doc-colle...605en.html
[ page nav not working ]
----------------------------------------------------------------------------------------------------------------------------------------------------
----------------- Power Reactor Event Notices
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----------------------------------------------------------------------------------------------------------------------------------------------------
----------- [ Current event for IL_Braidwood_1 ]

20180604 | IL_Braidwood_1 | MANUAL REACTOR TRIP ON LOWERING STEAM GENERATOR WATER LEVEL |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53443

"At 0920 CDT [ on June 04, 2018 ], Braidwood Unit 1 reactor was manually tripped due to lowering steam generator water levels following a trip of the 1C main feedwater pump.
The cause of the 1C main feedwater pump trip is unknown at this time and is under investigation.

"Both trains of Braidwood Unit 1 auxiliary feedwater started automatically following the reactor trip to maintain steam generator water levels.

"All systems responded as expected.

Steam generator power operated relief valves lifted momentarily and reseated as designed in response to the secondary transient due to the reactor trip.
The main steam dump valves are in service to the main condenser to provide heat sink cooling.
The plant is being maintained at normal operating pressure and temperature.
AC power is being provided by offsite power with the diesel generators in standby and all safety systems available.
There is no impact to Unit 2.

"This report is being made per 10CFR50.72(b)(2)(iv)(B) for a RPS actuation, 4-hr. notification,
and per 10CFR50.72(b)(3)(iv)(A) for an automatic actuation of the auxiliary feedwater system, 8-hr. notification."

All rods inserted into the core during the trip.

Concerning the relief valves momentarily lifting and reseating, there is no known primary-to-secondary leakage.

The licensee has notified the NRC Resident Inspector.

----------- [ 2018 event history for IL_Braidwood ]


20180430 | IL_Braidwood_1 | AUTOMATIC REACTOR TRIP FOLLOWING TURBINE TRIP |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53371


20180430 | IL_Braidwood_1 | Exit RFO

20180422 | IL_Braidwood_1 | UNDERVOLTAGE ACTUATION OF THE ENGINEERED SAFETY FEATURE BUS |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53358

20180420_1730_CDT | IL_Braidwood_1 | DEGRADED REACTOR VESSEL HEAD |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53354

20180420_1042_CDT | IL_Braidwood_1 | BOTH DIESEL GENERATORS INOPERABLE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53353

20180419 | IL_Braidwood_1 | UNDERVOLTAGE ACTUATION OF THE ENGINEERED SAFETY FEATURE BUS |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53347

20180409 | IL_Braidwood_1 | Begin RFO


20180126 | IL_Braidwood_1;2 | Update LOSS OF ASSESSMENT CAPABILITY DUE TO TECHNICAL SUPPORT CENTER PLANNED MAINTENANCE  |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53180

20180123 | IL_Braidwood_1;2 | LOSS OF ASSESSMENT CAPABILITY DUE TO TECHNICAL SUPPORT CENTER PLANNED MAINTENANCE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53180

20180123 | IL_Braidwood_1;2 | LOSS OF ASSESSMENT CAPABILITY DUE TO TECHNICAL SUPPORT CENTER PLANNED MAINTENANCE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53180

--------------------------------------------------------------------------------------------------
----------- [ Current event for
----------- [ 2018 event history for
--------------------------------------------------------------------------------------------------
----------- [ Part 21 Notice ]
----------------------------------------------------------------------------------------------------------------------------------------------------
----------------- Other reactor info from daily power tracking
-----------------------------------------------------------------------------------------------------------------

Region 1



NJ_Salem_1 @ 100% ; 99 % ; 100 % Sunday, may be related to EN posted today or associated with last months emergency shutdown.

NJ_Salem_2 @ 90%, no EN, reason for power drop unk.   


Region 2


AL_Browns_Ferry_3 @ 92 % up from 90 % since Saturday
[ Unit has not been able to achieve full power since exiting RFO Apr 03 ] ( used 45 of typ 43 days )

NC_Brunswick_1 @ 94 % up from 55 % ; 52 % Satuday, no EN, reason for drop unk.



Region 3


IL_Byron_2 @ 100 % up from 92 % ; 76 % Sunday, no EN, reason for drop unk.




Region 4

AR_Arkansas_1 @ 98 % up from 97 % ; RFO restart ( used 44 of typ 35 )
[ unit is struggling to achieve full power after RFO ]

WA_Columbia_2 @ 65 %  - transformer problem

NE_Cooper_1 @ 0 %, no EN, reason for drop unk.

LA_RiverBend_1 @ 91 % up from 83 % ; 67 % Sunday, dropped to 64 % Saturday, n EN, reason for drop unk.




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[ There are currently 0 units with the RPV open - ref the Current ReFueling Outage Schedule and Status ]


posted by Staup Knewkinus a Dane Gerous production. All human rights reserved.
 
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