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NPS_Watch May 21, 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 May 21, 2018         
https://www.nrc.gov/reading-rm/doc-colle...521en.html

--------------------------------------------------------------------------------------------------
----------------- Power Reactor Event Notices
--------------------------------------------------------------------------------------------------
----------- [ Current event for WA_Columbia_2 ]

20180518 | WA_Columbia_2 | AUTOMATIC REACTOR SCRAM CAUSED BY MAIN TRANSFORMER TRIP |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53410

"At 0651 [PDT] on May 18th, 2018, Columbia Generating station experienced a Main Transformer trip,
that caused a Reactor Scram.

Reactor Power, Pressure and Level were maintained as expected for this condition.
[ Pressure and level were NOT maintained , that's why SRV valves opened. ]

MS-RV-1A (Safety Relief Valve) and MS-RV-1B (Safety Relief Valve) opened on reactor high pressure during the initial transient.
[ Notice no actual pressure value reported, in a future report look for them to declare that the set point values were too low. ]


MS-RV-1B appeared to remain open after pressure lowered below the reset point.


The operating crew removed power supply fuses for MS-RV-1B and it currently indicates intermediate position.
SRV (Safety Relief Valve) tail pipe temperatures indicate all valves are closed.
[ Conflicting indications, they had no confirmation (ie visual ) that the vales were actually closed. ]

Suppression pool level and temperature have remained steady within normal operating levels.

"All control rods inserted and reactor power is being maintained subcritical.

"RPV (Reactor Pressure Vessel) water level is being maintained with condensate
and feed system with startup flow control valves in automatic.

Reactor Pressure is being maintained with the Turbine Bypass valves controlling in automatic.

The main condenser is the heat sink.

"No ECCS (Emergency Core Cooling Systems) systems actuated or injected; the EOC-RPT (End of Cycle-Recirculation Pump Trip)
and RPS (Reactor Protection System) systems actuated causing a trip of the RRC pumps and a reactor scram.

"Core recirculation is being maintained with RRC-P-1A (Reactor Recirculation Pump) running.

"No release has occurred.

"At this time there will be no notifications to state, local or other public agencies.
[ In other words try not to alert anyone of the event, but Annette Cary of Tri-City Herald filed a report. ]
Problem triggers shutdown of Richland nuclear plant  |
http://www.tri-cityherald.com/news/local...25994.html

[ Event occurred at 0651 PDT but wasn't reported to NRC until 1327 ET according to EN. ]

"The NRC Senior Resident has been notified.

"The cause of the event is currently under investigation.

Plant conditions are stable."

The plant is in its normal electrical alignment and offsite power is available to the site.

[ SRV's opening is not normal. Unit reports 0 % as of this mornings reports. ]


----------- [ 2018 event history for WA_Columbia ]

[ There are no other 2018 ENs for this site. ]




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

Region 1


NY_Fitzpatrick_1 @ 74 % up from 45 % ; 52 % ; 52 % ; , no EN, reason for power drop unk.

NJ_HopeCreek_1 @ 98 % RFO restart ( used 27 of typ 22 )

PA_Limerick_2 @ 90 % dropped to 65 % Saturday, no EN, reason for drop unk.

NY_NineMilePoint_2 @ 100 % - Completed RFO ( used 27 of typ 22 )

PA_Susquehanna_1 @ 96 % - dropped to 67 % Saturday, no EN, reason for drop unk.

PA_ThreeMileIsland_1 @ 98 %, no EN, reason for drop unk.


Region 2


AL_Browns_Ferry_2 @ 80 %, no EN, reason for drop unk.

AL_Browns_Ferry_3 @ 87 % up from 72 % dropped to 67 % Saturday, no EN, reason for drop unk.  
[ This unit has not been able to achieve full power since exiting RFO Apr 03 ] ( used 45 of typ 43 days )

AL_Farley_1 @ 100 % Completed RFO restart ( used 32 of typ 22 )

GA_Hatch_2 @ 0 %, SD Saturday, no EN, reason for SD unk.

SC_Oconee_3 @ 100 % Completed RFO ( used 27 of typ 28 )


Region 3

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

IL_Clinton_1 @ 1 % RFO restart ( used 21 of typ 20 )

IL_Dresden_2 @ 100 % dropped to 68 % Saturday, no EN, reason for power drop unk.

IL_Dresden_3 @ 100 % dropped to 99 % Sunday, no EN, reason for power drop unk.

MI_Cook_2 @ 100 % Recovered from SD during RFO restart ( used 59 of typ 90 )

IA_Duane_Arnold_1 @ 98 %, dropped to 76 % Sunday down from 100 % Saturday, no EN, reason f pwer drop unk.

MI_Fermi_2 @ 62 % down from 63 % struggling to restart from 22 days down
AUTOMATIC REACTOR SCRAM AND EMERGENCY CORE COOLING SYSTEM INJECTION |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53336

IL_LaSAlle_1 @ 100 %, dropped to 82 % Sunday, no EN, reason for power drop unk.


Region 4

AR_Arkansas_1 @ 15 % up frm 0 % RFO restart ( used 44 of typ 35 )
[ no EN. Sudden full power ( 05/07 ) then SD ]

KS_WolfCreek_1 @ 95 %, RFO restart ( used 47 of typ 41 )

[ There are currently 1 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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