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NPS_Watch Feb 11, 2019
#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.

[ PART21 update affecting multiple units. ]

NRC Event Notices for February 11, 2019 |
https://www.nrc.gov/reading-rm/doc-colle...211en.html

[  ]

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

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[ No previous ENs for this year. ]

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------------[ PART 21 ]
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20190211 | CA_DiabloCanyon_1 | Update POTENTIAL PART 21 INVOLVING A200 SERIES STARTERS |
https://www.nrc.gov/reading-rm/doc-colle...ml#en51611

EN Revision Imported Date : 2/11/2019

EN Revision Text: POTENTIAL PART 21 INVOLVING A200 SERIES STARTERS

The following is excerpted from a report submitted by QualTech NP, Nuclear Division, Curtiss-Wright Corporation:

"Pacific Gas and Electric (PG&E) reported to QTNP [QualTech NP] that they have had eight Cutler Hammer A200 series starter failures since September 15, 2008.
The failures would remain in the operated/energized contact state with power removed for some period of time.
All starters impacted with this failure were continuously energized.
The concern was that if tripped, that the main contacts would not open to protect the motor.

"Testing was performed by Eaton Industrial Controls Division after receiving defective samples from PG&E.
The test report from Eaton was received by QTNP for further review and evaluation.
On October 6, 2015 QTNP determined that the Cutler Hammer A200 series starter failures may be reportable and an extent of condition review needed to be done.

"The root cause was a silicon based mold release that remained on the molded parts and would come between the moving (magnet) & fixed armatures.
When heated for an extended period of time, this material would become sticky causing anywhere from a minor delay in opening, up to a frozen closed condition.

"Cutler Hammer has determined that the silicone mold release was first introduced into the manufacturing facility in May, 2008,
due to a shortage of the Zinc Stearate Mold release that was traditionally used.

The silicon based mold release was periodically used until October 2012.

According to Cutler Hammer, anything made after January 1, 2013 should definitely be silicon mold release free.

"Thus any starters/contactors of the CH A200 series manufactured between May 2008 & December 31 , 2012 could have this concern.
This failure has only been reported for continuously energized applications.
The end user should evaluate their applications for this potential failure mechanism."

QTNP has notified North Anna, H. B. Robinson, Diablo Canyon, and Hatch.


[ Of the units named in this EN, Hatch_2; NorthAnna_2; DiabloCanyon_1 are all sched for 2019 Spring RFO. ]
[ NorthAnna_1 is sched for 2019 Fall RFO. ]

[ The zinc stearate is used to keep the molded item from sticking to the mold much like flour is used in baking. ]
http://www.crayvalley.com/docs/technical...earate.pdf

[
 The root cause is what it always is when dealing with nukiller power, profits and greed.
 The manufacturer ran out of the usual stuff and made a substitution to keep production going.
 Sound familiar? Does kittylitter jog your memory?
 As usual no units were shutdown because of this issue, no executives were injured, no profits lost.
]

[ The orig EN is from 2015. ]
" originally identified in NRC Event Number 51611 from 2015 "
https://www.nrc.gov/reading-rm/doc-colle...ml#en51611
[ the event date was Oct 10, 2015 ]

[ So the defect has probably been corrected by now. Except this update states that date range has changed. ]
[ No changes in the affected units. Yet. ]


* * * UPDATE ON 2/8/19 AT 1831 EST FROM AZZ NUCLEAR GROUP TO BRIAN P. SMITH * * *

"PDMS material has been identified in the Eaton A200 series starters/contactors with date code T4115 (41st week of 2015)
which is outside the range of May 2008 to December 2012 that were originally identified in NRC Event Number 51611 from 2015.

This resulted in a few instances where the starter did not immediately open when the power was removed."

Notified R2DO (Masters), R4DO (Werner), and PART 21/50.55 REACTORS via email



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----------------- Other reactor info from daily power tracking
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Region 1
 
MD_Calvert_Cliffs_2 @ 92 % [ coastdown to RFO 20190218 ]

NY_Nine_Mile_Point_1 @ 95 % [ coastdown to RFO 20190320 ]

NJ_Oyster_Creek_1 @ 0 % [ RPV CLOSED , defueled , permanent shutdown ]

PA_Susquehanna_1 96 % down from 97 % Sunday; 86 % Saturday
[ No EN, unk reason fro power drop ]

PA_Susquehanna_2 @ 91 % [ coastdown to RFO 20190323 ]


Region 2

AL_Browns_Ferry_2 @ 85 % [ coastdown to RFO 20190218 ]

NC_Brunswick_2 @ 100% up from 97 % [ coastdown to RFO 20190302 ]
[ coastdown interrupted ]

GA_Hatch_2 @ 0 % [ RPV OPEN ( 08 / 20 ) ] [ 20190204 shutdown early ]

TN_Watts_Bar_2 @ 100 % unch from 100 % Saturday; ]
[ 27 %; 10 %; 0 %; 0 %; 0 %; 0 % Sunday; 100 % Saturday
[ No EN, unk reason for shutdown. ]


Region 3

IL_Clinton_1 @ 98 % unch from 98 % unch from 98% down from 99 % unch from 99 % Sunday; 98 % Saturday
[ units normal operating range ]

IL_La_Salle_2 @ 86 % [ coastdown to RFO 20190206 ]

MN_Monticello_1 @ 91 %  [ coastdown to RFO 20190415 ]

OH_Perry_1 @ 78 % [ coastdown to RFO 20190309 ]
[ power is too low for Mar RFO ]


Region 4

CA_DiabloCanyon_1 @ 0 % [ Begin RFO ( 02 / 33 ) ] 20190210 ]
[ Expect RPV OPEN Wednesday ]

LA_RiverBend_1 @ 75 % unch from 75 % unch from 75 % unch from 75 % Sunday; 75 % Saturday;
[ coastdown to RFO 20190330, too low for RFO date. ]

LA_Waterford_3 @ 0 % [ RPV OPEN ( 38 / 39 )  ]


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[ There is/are currently 2 unit(s) with the RPV OPEN - ref the 2019 Spring Refueling Outage Schedule and Status ]
[ There were many changes to the RFO schedule. I updated the RFO Status page. ]

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