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



There are 6 EN(s) today, 1 associated with power stations.

NRC Event Notices for April 05, 2018         
https://www.nrc.gov/reading-rm/doc-colle...405en.html

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

[ The only power reactor EN today is a retraction ]


----------- [ Current event for MO_Callaway_1 @ 100 % RX Mode: Power Op]

ALL THREE AUXILIARY FEEDWATER PUMPS INOPERABLE DUE TO HELB DOOR BEING OPEN
https://www.nrc.gov/reading-rm/doc-colle...ml#en53223

* * * RETRACTION ON 4/4/2018 at 1109 EDT FROM JONATHAN LAUF TO DAVID AIRD * * *

"Event Notification (EN) # 53223, made on 2/20/2018,
is being retracted because new information has been obtained that negates the original basis for reporting the unanalyzed condition.

Specifically, an evaluation of the HELB that is postulated to occur in the TDAFP room has determined that without crediting door DSK13311 for protection,
the affected safety-related instruments would not be exposed to environmental conditions beyond their analyzed capability.

"This resulted in a conclusion that the unanalyzed condition of door DSK13311 being open did not prevent the affected safety-related instruments
or their supported AFW pumps from performing their required safety functions to shut down the reactor and maintain it in a safe shutdown condition,
remove residual heat, and/or mitigate the consequences of an accident, nor did it significantly degrade plant safety.

Consequently, the condition did not meet the criteria for an 8-hour notification per 10 CFR 50.72(b)(3)(ii)(B) and 10 CFR 50.72(b)(3)(v)(A), (B), or (D)."

The licensee notified the NRC Resident Inspector.

Notified R4DO (Drake).


-------------- [ section of the original EN ]

At 1225 CST, all three Auxiliary Feedwater [AFW] pumps were declared inoperable at the Callaway Plant upon discovery that a door (DSK13311)
credited for protection of equipment from the effects of a high-energy line break (HELB) hazard
had come partially open due to vibration harmonics from the running turbine-driven Auxiliary Feedwater pump (TDAFP).
Immediate investigation identified that play in the mechanism that holds the door closed had rendered it susceptible to movement from the vibration harmonics.

"The affected HELB door specifically protects safety-related instruments that provide a swap-over signal
upon detection of a low suction pressure condition for the AFW pumps and thereby automatically effect a suction transfer
for the AFW pumps from the condensate storage tank (normal/standby source)
to the Essential Service Water (ESW) system (credited safety-related source).

--------------

[ So instead of fixing the door latch, they just decided that keeping the door closed wasn't that important. ]

[ The nuke industry loves to tout how safety conscious they are, until some safety item gets in the way of profit.  ]

[ Then they'll cite the over abundancy of redundancy. ]

----------- [ 2018 event history for MO_Callaway_1 ]

20180220 | ALL THREE AUXILIARY FEEDWATER PUMPS INOPERABLE DUE TO HELB DOOR BEING OPEN     
https://www.nrc.gov/reading-rm/doc-colle...ml#en53223

20180212 | LOSS OF VENTILATION IDENTIFIED DURING TECHNICAL SUPPORT CENTER TEST     
https://www.nrc.gov/reading-rm/doc-colle...ml#en53203

20180124 | Update PART 21 NOTIFICATION - CHECK VALVE DISC THICKNESS COULD CAUSE VALVE TO STICK OPEN     
https://www.nrc.gov/reading-rm/doc-colle...ml#en53177

20180119 | Update PART 21 NOTIFICATION - CHECK VALVE DISC THICKNESS COULD CAUSE VALVE TO STICK OPEN     
https://www.nrc.gov/reading-rm/doc-colle...ml#en53177


----------- [ Current event for  ]
----------- [ 2018 event history for  ]
[ There are no other ENs for this unit ]
----------- [ PART 21 ]
----------- [ 2018 event history for PART 21 ]

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

Region 1

MA_Pilgrim_1 is still shutdown, 30th day. [ 414 days to permanent SD ]



Region 2

AL_Browns_Ferry_3 @ 0 % shutdown while Restarting, No EN. used 45 of typ 43 days for RFO.

NC_Brunswick_1 @ 40 % up from 21 % restarting after RFO used ( 32 of typ 28 )

SC_Catawba_2 RPV closed, restart preps

AL_Farley_1 @ 48 % holding from yesterday, restarting from 6 day shutdown. No EN.

GA_Hatch_2 @ 85 % holding, No EN.

VA_North_Anna_1 RPV closed, restart preps

FL_Saint_Lucie_1 RPV closed, restart preps

VA_Surry_1 coastdown

Region 3

IL_QuadCities_2 RFO day 18 of typ 17, sb restarting


Region 4



[ There are currently 7 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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