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Full Version: NPS_Watch May 16, 2019
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DD_20190516
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The Daily Dose - Exposing the nuclear power industry while the nuclear power industry exposes you.

There are 3 EN(s) today, 2 associated with power stations.

[ One of the NPS ENs is a repost of yesterday. ]

NRC Event Notices for May 16, 2019 |
https://www.nrc.gov/reading-rm/doc-colle...516en.html

[  ]

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----------------- Power Reactor Event Notices
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----------- [ Current event for TX_ComanchePeak_2 ]

20190515 | TX_ComanchePeak_2 | VOLTAGE TRANSIENT DUE TO LOSS OF OFFSITE SWITCHYARD |
https://www.nrc.gov/reading-rm/doc-colle...ml#en54064
https://www.nrc.gov/reading-rm/doc-colle...ml#en54064

"At 2151 CDT, on 14 May 2019,
Comanche Peak Nuclear Power Plant (CPNPP) experienced a voltage transient within the onsite
138kV switchyard due to the loss of one of the offsite switchyards
supplying power to the CPNPP 138kV switchyard.

The reduction in safeguards bus voltage due to the transient caused the Unit 2 safeguard busses
to load shed and perform a slow transfer to power supplied from 345kV transformer XST2A.

Unit 2 was subjected to actuation of both blackout sequencers causing an automatic start of both
motor driven Auxiliary Feedwater (AFW) pumps as well as the turbine-driven AFW pump.


"No emergency diesel generators started by design.
All AFW pumps have been returned to standby status.
All other safety systems functioned as designed.
Unit 1 is currently defueled, and was unaffected by this event.

"The licensee has notified the NRC resident inspector."


----------- [ 2019 event history for TX_ComanchePeak ]

20190302 | TX_ComanchePeak_2 | REACTOR TRIP DUE TO FEEDWATER ISOLATION VALVE CLOSURE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53906


20190123 | TX_ComanchePeak_2 | full power
20190116 | TX_ComanchePeak_2 | Shutdown, no EN

20190115 | TX_ComanchePeak_2 | Exit RFO ( 37 / 41 )  Stator Replacement planned
20181208 | TX_ComanchePeak_2 | Begin RFO ( 01 / 41 )  Stator Replacement planned


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----------- [ Current event for AZ_PaloVerde_1 ]

20190515 | AZ_PaloVerde_1 | Update UNANALYZED CONDITION DUE TO ECCS LEAKAGE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53968

"At 2006 [MST], on 3/31/2019,
the Palo Verde Nuclear Generating Station Unit 1 Shift Manager was informed that leakage was
measured from the Train A Emergency Core Cooling System (ECCS) piping at approximately 100 ml/minute
through a High Pressure Safety Injection (HPSI) A drain valve.
[ 100ml/min x 60min = 6000 ml/hr ]

This value exceeds the assumed 3000 ml/hour ECCS leakage for a large break loss of coolant accident analysis.

At 0230 [MST] on April 1, 2019, the valve was flushed and the leakage reduced to 10 ml/minute (600 ml/hour)
and was no longer above the limit of the safety analysis.
[ but it was still leaking ]

This condition is being reported as an unanalyzed condition per 10 CFR 50.72(b)3)(ii)(B)
and a condition that could have prevented the fulfillment of a safety function
to the control the release of radioactive material per 10 CFR 50.72(b)(3)(v)©.

This event did not result in an abnormal release of radioactive material.
[
 Just the 'normal' release, aka how any drops of poison can I put in your coffee today sir?
 Never mind I've decided that 2 drops is normal.

]  

"Notification received by Caty Nolan and emailed to HOO.HOC@NRC.GOV
The NRC asked a followup question:
Why was the criterion for Control of Radioactive Material selected?
per the PVNGS Unit 1 Shift Manager, this criterion was selected due to the potential of exceeding offsite dose projections,
post recirculation, following a Design Basis Accident."

The resident inspector has been notified.



* * * UPDATE ON 05/15/19 AT 1417 EDT FROM SEAN DORNSEIF TO BETHANY CECERE * * *

"An engineering evaluation concluded that the as-found ECCS leakage
would not have degraded the performance of the Pump Room Exhaust Air Cleanup system;

therefore, it remained operable.

"The evaluation also concluded that the as-found leakage was within the analysis margins for
HPSI pump hydraulic performance and containment flood level following a Large Break Loss of Coolant Accident;
therefore, the ECCS also remained operable.

"Based on the above information, the condition identified on March 31, 2019,
was an unanalyzed condition per 10 CFR 50.72(b)(3)(ii)(B),
but did not prevent the fulfillment of the safety function of the structures or systems that are
needed to control the release of radioactive material per 10 CFR 50.72(b)(3)(v)©.

"The NRC resident inspectors have been informed."

Notified R4DO (Proulx).

[ Another EN negated through "engineering evaluation" just before the 60 day LER threshold. ]


----------- [ 2019 event history for AZ_PaloVerde ]

20190509 | AZ_PaloVerde_1 | Exit RFO ( 33 / 30 )
20190406 | AZ_PaloVerde_1 | Begin RFO ( 01 / 30 ) 20190405

20190405 | AZ_PaloVerde_1 | sched Begin RFO (   / 30 ) 20190405

20190331_2006_MST | AZ_PaloVerde_1 | UNANALYZED CONDITION DUE TO ECCS LEAKAGE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53968


20190107 | AZ_PaloVerde_2 | NRC Names New Resident Inspector at Palo Verde Nuclear Generating Station |
https://www.nrc.gov/reading-rm/doc-colle...001.iv.pdf

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


----------- [ 2019 event history for


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----------- [ Current event for
----------- [ 2019 event history for
[ no previous ENs for this site in 2019 ]
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------------[ PART 21 ] - These ENs are for issues that involve multiple site/reactor units
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------------Other reactor info from daily power tracking https://www.nrc.gov/reading-rm/doc-colle...atus/2019/
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[  ]

Region 1
 
CT_Millstone_3 @ 60 % up from 30 % up from 0 % Tuesday
[ Exit RFO ( 33 / 33 ) RFO plan start 20190418 ]

MA_Pilgrim_1 @ 87 % unch from 87 % down from 92 % [ coastdown to permanent closure ]
[ as of today there are only 16 operating days left. ]

NJ_Salem_1 @ 0 % [ RPV OPEN ( 34 / 28 ) ] RFO started early



Region 2

AL_Browns_Ferry_2 @ 89 % unch from 89 % up from 87 % down from 89 % Sunday; 89 % Saturday
[ Exit RFO ( 39 / 25 ) ] power uprate testing, missed planned restart date

AL_Farley_2 @ 100 % up from 93 % unch from 93 % down from 100 %
[ no EN, unk reason for powr drop. ]

FL_Saint_Lucie_1 @ 0 % since 20190425
 AUTOMATIC REACTOR TRIP DUE TO TURBINE GENERATOR TRIP |
 https://www.nrc.gov/reading-rm/doc-colle...ml#en54027

TN_Watts_Bar_2 @ 14 % up from 0 %
[ Exit RFO ( 33 / 26 ) 20190413 ] missed planned restart date



Region 3

IL_Clinton_1 @ 98 %
[ 98-99 % are this units normal thermal power range. ]

MI_DC_Cook_1 @ 47 % unch from 47 % unch from 47 % unch from 47 % down from 48 % Sunday; 46 % Saturday
[ Exit RFO ( 55 / 90 ) 20190306  ]

IL_Dresden_2 @ 67 % down from 70 % up from 58 % up from 0 % down from 5 % Sunday; 18 % Saturday
[ no EN, unk reason for shutdown. ]
 [ was recovering from ]
 AUTOMATIC REACTOR SCRAM DUE TO TURBINE TRIP |
 https://www.nrc.gov/reading-rm/doc-colle...ml#en54054

MN_Monticello_1 @ 100 % up from 52 % up from 35 % up from 0 %  
[ Completed RFO ( 30 / 30 ) 20190413 ]



Region 4

MO_Callaway_1 @ 0 % [ RPV CLOSED ( 45 / 42 ) 20190401; no coastdown 24hr SD

WA_Columbia_2 @ 0 % down from 13 % up from 0 % Sunday; 0 % Saturday
[ Begin RFO ( 03 / 31 ) Expect RPV OPEN Friday ] plnd start 20190515 ] started early  

TX_ComanchePeak_1 @ 0 % [ RPV OPEN ( 25 / 40 ) | 20190407 ] missed planned start date ]

MS_GrandGulf_1 @ 0 % down from 100 % Monday; 100 % Sunday; 0 % Saturday  
[ no EN, unk reason for power drop. ]

LA_RiverBend_1 @ 69 % down from 94 % up from 44 % up from 0 % down from 3 % Sunday; 12 % Saturday
[ Exit RFO ( 42 / 34 ] 2nd restart in progress; 1st restart failed; missed planned restart date
[ no EN, unk reason for shutdown. ]


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[ There is/are currently 02 unit(s) with the RPV OPEN - ref the 2019 Spring Refueling Outage Schedule and Status ]

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