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NPS_Watch Jun 06, 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 June 06, 2018    
https://www.nrc.gov/reading-rm/doc-colle...606en.html
[ page nav not working ]
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----------------- Power Reactor Event Notices
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----------- [ Current event for TN_WattsBar_1;2 ]

20180605 | TN_WattsBar_1;2 | Retract UNANALYZED CONDITION RELATED TO EMERGENCY CORE COOLING GAS ACCUMULATION ACCEPTANCE CRITERIA |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53349

EN Revision Imported Date : 6/6/2018

EN Revision Text: UNANALYZED CONDITION RELATED TO EMERGENCY CORE COOLING GAS ACCUMULATION ACCEPTANCE CRITERIA

"On April 19, 2018 at 1944 EDT,
Watts Bar Nuclear Plant (WBN) determined that a preliminary analysis shows current acceptance criteria for gas accumulation in the WBN Unit 1 and Unit 2 Safety Injection System (SIS) and Residual Heat Removal System (RHRS) discharge piping may be non-conservative.

The surveillances that check void values and allow venting of the systems are to be performed utilizing conservative criteria at more frequent intervals to ensure gas void volumes remain under acceptable limits.

Additional analysis is being performed to determine final actions.

"The NRC Resident Inspector has been notified."


* * * RETRACTION ON 6/5/18 AT 0801 EDT FROM DEAN BAKER TO ANDREW WAUGH* * *

"This event is being retracted.

The original report was made as a result of errors found in the gas accumulation analysis performed for WBN,
such that the analysis in use might be non-conservative.

WBN has performed additional analyses related to gas accumulation and determined
that both the Safety Injection and Residual Heat Removal systems remained operable
and would have been able to perform their safety functions during the past three years.

Therefore, this event was not an unanalyzed condition that significantly degrades plant safety.

"The NRC Resident Inspector has been notified."

Notified the R2DO (Ernstes).

----------- [ 2018 event history for TN_WattsBar_1;2 ]

20180530 | TN_WattsBar_1;2 | NRC to Hold Open House to Discuss 2017 Performance of Watts Bar Nuclear Power Plant | https://www.nrc.gov/reading-rm/doc-colle...027.ii.pdf

20180511 | TN_WattsBar_2 | CONTAINMENT SHIELD BUILDING INOPERABLE |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53398

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

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

20180430 | TN_WattsBar_1;2 | NRC Launches Special Inspection at Watts Bar Nuclear Power Plant |
https://www.nrc.gov/reading-rm/doc-colle...021.ii.pdf

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

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

--------------------------------------------------------------------------------------------------
----------- [ Part 21 Notice ]
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----------------- Other reactor info from daily power tracking
-----------------------------------------------------------------------------------------------------------------

Region 1



NJ_Salem_2 @ 100 % up from 90%, no EN, reason for power drop unk.   


Region 2


AL_Browns_Ferry_3 @ 92 % ; 90 % Saturday
[ Unit has not been able to achieve full power since exiting RFO Apr 03 ] ( used 45 of typ 43 days )

NC_Brunswick_1 @ 89 % down from 94 % ; 55 % ; 52 % Satuday, no EN, reason for drop unk.

NC_Brunswick_2 @ 99 % down from 100 %, no EN, reason for drop unk.


Region 3

IL_Braidwood_1 @ 88 % up from 0 %, MANUAL REACTOR TRIP ON LOWERING STEAM GENERATOR WATER LEVEL |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53443



Region 4

AR_Arkansas_1 @ 98 % : 98 % ; 97 % ; RFO restart ( used 44 of typ 35 )
[ unit is struggling to achieve full power after RFO ]

WA_Columbia_2 @ 65 %  - transformer problem

NE_Cooper_1 @ 70 % up from 0 %, no EN, reason for drop unk.

LA_RiverBend_1 @ 85 % down from 91 % ; 83 % ; 67 % Sunday, dropped to 64 % Saturday, n EN, reason for drop unk.


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[ There are currently 0 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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