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NPS_Watch Apr 27, 2018
#1
The Daily Dose - Exposing the nuclear power industry while the nuclear power industry exposes you.


There are 7 EN(s) today, 2 associated with power stations.

NRC Event Notices for April 27, 2018         
https://www.nrc.gov/reading-rm/doc-colle...427en.html

--------------------------------------------------------------------------------------------------
----------------- Power Reactor Event Notices
--------------------------------------------------------------------------------------------------

----------- [ Current event for NC_Harris_1 @ 0 %; RX Mode Refueling

20180426_1800 | NC_Harris_1 | LOSS OF EMERGENCY ASSESSMENT CAPABILITY |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53366

"This is an eight-hour, non-emergency notification for a loss of emergency assessment capability.
This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) because planned maintenance activities were performed on April 23rd through April 25th on the seismic monitoring system without viable compensatory measures established.

"There was no impact on the health and safety of the public or plant personnel.
The NRC Resident Inspector has been notified."

[ This EN illustrates nicely how we can use the ENs to sequence the RFO activity. ]
[ In the reactor info box we can see the RX Mode was Defueled then transitioned to Refueling. ]
[ This occurred on the 20 th day of the RFO. ]  


----------- [ 2018 event history for

20180411 | NC_Harris_1 | DEGRADED CONDITION DUE TO INDICATION DURING ULTRASONIC EXAMINATION OF REACTOR NOZZLE PENETRATION |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53326

20180407 | NC_Harris_1 | AUTOMATIC ACTUATION OF AUXILIARY FEEDWATER SYSTEM (AFW) |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53318

20180407 | NC_Harris_1 | Begin RFO


----------- [ Current event for LA_RiverBend_1 @ 100 % RX Mode: Power Op ]

20180426 | LA_RiverBend_1 | INADVERTENT INJECTION OF HIGH PRESSURE CORE SPRAY |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53365

"River Bend Station experienced an inadvertent initiation and injection of High Pressure Core Spray (HPCS) at 1531 [CDT] on 4/26/2018 while operating at 100 percent power.

"During replacement of Level Transmitter B21-LTN081C 'Reactor Vessel Low Water Level 1',
Main Control Room received an inadvertent initiation and injection of High Pressure Core Spray.

[ human error, techs accidentally caused this activation. ]
 
The HPCS injection valve was open for approximately 40 seconds before the operators manually closed the valve.

"Feedwater Level Control responded per design and maintained Reactor Water Level nominal values.
The Division 3 Diesel Generator (DG) also automatically started in response to the actuation signal.
The DG did not automatically connect to the Division 3 switchgear since there was not a low voltage condition on the bus.

"The manual closure of the injection isolation valve caused the system to be incapable of responding to an automatic actuation signal.
The manual override of the injection isolation valve was reset approximately 16 minutes after the event, restoring the system to its standby condition.
This event is being reported in accordance with
10 CFR 50.72(b)(2)(iv)(A) as a condition that caused ECCS [Emergency Core Cooling System] discharge to RCS [Reactor Coolant System] and
10 CFR 50.72(b)(3)(v)(D) as a condition that caused the loss of function of the HPCS System.

"The Senior NRC Resident inspector has been notified."

----------- [ 2018 event history for

20180411 | LA_RiverBend_1 | CONDITION THAT COULD IMPAIR FUNCTION OF CONTROL BUILDING AC SYSTEM |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53324

20180323 | LA_RiverBend_1 | Retract MANUAL REACTOR SCRAM |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53192

20180201 | LA_RiverBend_1 | MANUAL REACTOR SCRAM |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53192

-----------------------------------------------------------------------------------------------------------------
----------------- Other reactor info from daily power tracking
-----------------------------------------------------------------------------------------------------------------

Region 1

MD_CalvertCliffs_2 @ 80 %, no EN, reason for power drop unknown.

MA_Pilgrim_1 @ 98 %, no EN, reason for power drop unknown.


Region 2

AL_Browns_Ferry_3 @ 85 % up from 84 % ( used 45 of typ 43 days )
[ This unit has not been able to achieve full power since exiting RFO Apr 03 ]




Region 3

IL_Clinton_1 was due to begin 4/20, is in coastdown, may have been a sched change.

MI_Fermi_2 @ 0 % 13th day down
AUTOMATIC REACTOR SCRAM AND EMERGENCY CORE COOLING SYSTEM INJECTION |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53336


Region 4

TX_SouthTX_2 @ 14 % restarting used 33 of typical 38 )


[ There are currently 13 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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