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NPS_Watch May 10, 2018
#1
The Daily Dose - Exposing the nuclear power industry while the nuclear power industry exposes you.


There are 4 EN(s) today, 1 associated with power stations.



NRC Event Notices for May 10, 2018         
https://www.nrc.gov/reading-rm/doc-colle...510en.html

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

----------- [ Current event for TN_WattsBar_1 ]

20180510 | TN_WattsBar_1 | Retract BOTH TRAINS OF RESIDUAL HEAT REMOVAL INOPERABLE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53355

* * * RETRACTION FROM ANTHONY PATE TO DONALD NORWOOD AT 1310 EDT ON 5/9/2018 * * *

"This event is being retracted.

The initial report was based on a conservative acceptance criteria for gas accumulation adopted
on April 19, 2018 when it was determined that the previously used acceptance criteria for gas
accumulation in the ECCS was non-conservative.

[ So this unit has also determined that the "conservative", ie lower or safer value, was too
restrictive so they went back to the previous value.
]

Additional analysis has subsequently been performed and determined that a higher gas accumulation
acceptance criteria does not challenge operability.

[ " does not challenge operability ", just abnormal conditions ]
 
With a void of less than the acceptance criteria, in the event of ECCS actuation,
the system piping support loads will remain within structural limits
and the piping system will remain operable.

[ What about when the void is at or over the acceptable val? ]

Therefore, both trains of Unit 1 RHRS were operable
and the previously reported 10 CFR 50.72(b)(3)(v)(B) event is being retracted.

[ Word magic, *poof* the problem is gone. ]

"The NRC Resident Inspector has been informed of this event retraction."

Notified R2DO (Ehrhardt).


-----------

----------- [ 2018 event history for TN_WattsBar ]

20180504 | TN_WattsBar_2 | Retract BOTH TRAINS OF RESIDUAL HEAT REMOVAL INOPERABLE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53356

20180422 | TN_WattsBar_2 | BOTH TRAINS OF RESIDUAL HEAT REMOVAL INOPERABLE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53356

20180421 | TN_WattsBar_1 | BOTH TRAINS OF RESIDUAL HEAT REMOVAL INOPERABLE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53355

20180419 | TN_WattsBar_1;2 | UNANALYZED CONDITION RELATED TO EMERGENCY CORE COOLING GAS ACCUMULATION ACCEPTANCE CRITERIA |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53349

20180412 | TN_WattsBar_2 | AUTOMATIC REACTOR TRIP |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53327



20180329 | TN_WattsBar_1 | Retract FAILURE OF CONTAINMENT PENETRATION THERMAL RELIEF CHECK VALVES TO MEET SURVEILLANCE ACCEPTANCE CRITERIA |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53196

20180326_1839_EDT | TN_WattsBar_1 | TEMPORARY LOSS OF CONTROL ROOM ENVELOPE BOUNDARY |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53291

20180326_1058_EDT | TN_WattsBar_1 | TEMPORARY LOSS OF CONTROL ROOM ENVELOPE BOUNDARY |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53288

20180204 | TN_WattsBar_1 | FAILURE OF CONTAINMENT PENETRATION THERMAL RELIEF CHECK VALVES TO MEET SURVEILLANCE ACCEPTANCE CRITERIA |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53196

20180117 | TN_WattsBar_1 | SHIELD BUILDING INOPERABLE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53173

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

Production of Tritium in Commercial Light Water Reactors
https://s3.amazonaws.com/public-inspecti...-06463.pdf

The decision allows for the production of tritium using TVA reactors at both the Watts Bar and Sequoyah sites
in eastern Tennessee and continues an interagency agreement with DOE/NNSA under The Economy Act
to provide irradiation services for producing tritium in TVA light water reactors.

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

20150130 | 29 pgs |
Watts Bar Nuclear Plant, Unit 1 Tritium Production Program, Updated Plans for Cycle 13
Operation and Updated Evaluation of the Radiological Impacts of Tritium Permeation into
the Reactor Coolant System
http://www.srswatch.org/uploads/2/7/5/8/...0_2015.pdf

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

Production of Tritium in a Commercial Light Water Reactor

Supplemental Environmental Impact Statement

https://www.tva.gov/Environment/Environm...er-Reactor

The NNSA is a semi-autonomous agency within the Department of Energy (DOE). DOE issued an EIS in 1999 on the CLWR program, which addressed the production of tritium in TVA reactors using tritium-producing burnable absorber rods (TPBARs). In the ROD for the CLWR EIS, DOE selected TVA’s Watts Bar Nuclear Plant Unit 1 and Sequoyah Nuclear Plant Units 1 and 2, located in Spring City and Soddy-Daisy, Tenn., respectively, for tritium production. TVA was a cooperating agency in the development of the CLWR EIS, and issued its ROD on the CLWR program in 2000. TVA has been producing tritium for NNSA at Watts Bar Unit 1 since 2004.

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


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

Region 1

PA_BeaverValley_1 @ 15 % RFO restart ( used 25 of typ 30 )

NJ_HopeCreek_1 @ 3 % RFO restart ( used 27 of typ 22 )

PA_susquehanna_1 @ 93 % up from 80 % up From 70 % down from 86 % restarting ( used 32 of typical 35 )

NJ_Salem_2 @ 100 % up from 19 % recovered from
MANUAL REACTOR TRIP |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53386


Region 2

AL_Browns_Ferry_2 @ 0 %. no EN, reason for SD unk. day 3

AL_Browns_Ferry_3 @ 87 % up from 88 % up from 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 ]

NC_Harris_1 @ 2 % RFO restart ( used 33 of typ 25 )

GA_HAtch_2 @ 50 % , no EN, reason for power drop unk.

TN_Sequoyah_1 @ 100 % RFO Completed ( used 30 of typ 35 )

TN_WattsBar_2 @ 58 %, no EN, reason for power drop unk.


Region 3

IL_Dresden_2 @ 100 % up from 93 %, No EN, reason for power drop unk.
IL_Dresden_3 @ 100 % up from 95 %, No EN, reason for power drop unk.

MI_Fermi_2 @ 90 % up from 88 % up from 42 % up from 0 % 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_QuadCities_1 @ 100 % up from 98 % up from 95 % down from 100 % up from 88 %, no EN. unk reason for drop.

MN_Moticello_1 @ 100 % up from 99 %, no EN, reason for power drop unk.

WI_PointBeach_1 @ 70 %, no EN, reason for power drop unk.


Region 4

AR_Arkansas_1 @ 0% down from 100 % up from 0% RFO ( used 44 of typ 35 )
[ no EN. Sudden full power then SD ]


[ There are currently 5 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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