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NPS_Watch May 02, 2018
#1
The Daily Dose - Exposing the nuclear power industry while the nuclear power industry exposes you.


There are 3 EN(s) today, 1 associated with power stations.

 

NRC Event Notices for May 02, 2018         
https://www.nrc.gov/reading-rm/doc-colle...502en.html

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

----------- [ Current event for MS_GrandGulf_1 @ 0 %; RFOD_025; RX Mode: Refueling ]

20180501 | MS_GrandGulf_1 | PLANT RECEIVED DIVISION ONE REACTOR PRESSURE VESSEL LEVEL 1 SIGNAL |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53374

"At 1551 hrs [CDT] on 5/1/2018, with the plant in Mode 5,
a division one Reactor Pressure Vessel (RPV) Level 1 signal was received;
however there was no actual change in RPV level.

RPV Level remained at High Water Level supporting refuel operations.
This caused an actuation of division one Load Shed and Sequencing system that shed and then re-energized the 15 bus.
Division one diesel generator started from standby.

Residual Heat Removal pump 'A', which was in shutdown cooling mode, was lost during the bus shed, and was re-sequenced upon re-energization of the 15 bus.
Upon restoration of shutdown cooling, the RHR pump discharged into the RPV.
RCS [ Reactor Coolant System ] temperature increased approximately 5 degrees Fahrenheit as a result of the loss of shutdown cooling.

[ No info on how long the event lasted but the RCS temp rise so quickly leads me to believe the fuel has been reloaded into the core. ]
[ This event occurred on the 25th day of the RFO ( RFOD_025 ) of a planned 50 day outage. This units history is filled with problems and was SD for an extended portion of 2016, something like 160 days or so IIRC, while the NRC did one of their kabuki inspections. After restart in Jan of 2017 the HPCI [ High Pressure Core Injection ] system was found to be non functional ( the first safety system line of defense ), it then took 2 weeks to achieve full power and sprung a leak in April and had to be SD again. ]


The cause of the actuation signal is under investigation.

[ Even tho they had several hours between the event and the time they reported it, what does that tell you. ]
[ a) They're clueless ]
[ b) They're hiding something ]
[ c) both ]

In accordance with NUREG 1022, Event Reporting Guidelines, this event is conservatively reported under 10 CFR 50.72(b)(2)(iv)(A)
as an event that results in emergency core cooling system discharge into the RCS as a result of a valid signal,
under 10 CFR 50.72(b)(3)(iv)(B)(8) as an event that results in the actuation of emergency ac electrical power systems,
and under 10 CFR 50.72(b)(3)(v)(B) as an event or condition that at the time of discovery could have prevented the fulfillment of a safety function (remove residual heat)."

The licensee notified the NRC Resident Inspector.



----------- [ 2018 event history for MS_GrandGulf ]

20180415 | MS_GrandGulf_1 | Retract TWO CRACKS IDENTIFIED AT THE FEED WATER LINE 'B' CONTAINMENT CONCRETE PENETRATION |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53335

20180413 | MS_GrandGulf_1 | TWO CRACKS IDENTIFIED AT THE FEED WATER LINE 'B' CONTAINMENT CONCRETE PENETRATION |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53335
RFOD_007; RX Mode: Refueling

20180407 | MS_GrandGulf_1 | Begin RFO

20180405 | MS_GrandGulf_1 | SECONDARY CONTAINMENT HATCH LEFT OPEN |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53317

20180331 | MS_GrandGulf_1 | SECONDARY CONTAINMENT INOPERABLE DUE TO FAILED SURVEILLANCE TEST |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53304

20180218 | MS_GrandGulf_1 | EMERGENCY DIESEL GENERATORS INOPERABLE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53227

20180210 | MS_GrandGulf_1 | BOTH INNER AND OUTER CONTAINMENT AIRLOCK DOORS INOPERABLE AT THE SAME TIME |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53201

20180130 | MS_GrandGulf_1 | MANUAL REACTOR SCRAM DUE TO MAIN TURBINE LOAD OSCILLATIONS |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53188

20180116 | MS_GrandGulf_1 | retract MANUAL REACTOR SCRAM DURING STARTUP |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53090


----------- [ Current event for

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

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

Region 1



MA_Pilgrim_1 @ 0 %, no EN, reason for power drop unknown.
[ 5th day SD, 396 days to permanent closure. ]

PA_susquehanna_1 @ 18 % restarting ( used 32 of typical 35 )



Region 2

AL_Browns_Ferry_3 @ 85 % since APR 13 ( used 45 of typ 43 days )
[ This unit has not been able to achieve full power since exiting RFO Apr 03 ]

SC_Summer_1 @ 87 %, no EN, reason for power drop unknown.



Region 3

IL_Braidwood_1 @ 75 % up from 12 % restarting ( used 21 of typ 18 days )

IL_Braidwood_2 @ 100% up from 99 % up from 73 %, No EN, unk reason for power drop.

IL_Byron_1 @ 100% up from 97 % up from 72 %, No EN, unk reason for power drop.

IL_Byron_1 @ 100% up from 96 % up from 72 % down from 90 %, No EN, unk reason for power drop.


IL_LaSAlle_2 @ 100% up from 65 % up from 63 %, No EN, unk reason for power drop.

IL_QuadCities_1 100% up from @ 99 % up from 88 %, No EN, unk reason for power drop.

[  ]


MI_Fermi_2 @ 0 % 18th day down
AUTOMATIC REACTOR SCRAM AND EMERGENCY CORE COOLING SYSTEM INJECTION |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53336


Region 4



[ There are currently 8 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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