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March 22, 2018
#1
Exposing the nuclear industry while the nuclear industry exposes you.

NRC Event Notices for March 22, 2018         
https://www.nrc.gov/reading-rm/doc-colle...322en.html

There are 2 EN(s) today, 1 associated with power stations.

[ The other EN is a repeat of the contaminated package from Laguna Verde ]

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

[ This EN is a retraction of an ongoing EN ]

Retract PART 21 - DEFECTIVE SAFETY RELATED VALVES     
https://www.nrc.gov/reading-rm/doc-colle...ml#en52857

[ Only the retraction segment is posted here, the entire EN history can be reviewed at the link. ]

* * * RETRACTION AT 1308 EDT ON 03/21/18 FROM SAMSON KAY TO DONG PARK * * *

The following information was provided as an update via fax:

"Crane reviewed diagnostic testing of 106 XOMOX plug valves for the purpose of validating the assumed torque values specified by XOMOX guidance. From the review of the diagnostic testing, we determined that on average, the actual torque required to stroke the valve (also referred to as the 'break torque') was approximately 56%-67% lower than the calculated value based on the UHMWPE sleeve material for valves with a 150 lbs. pressure class. Statistical analysis confirmed that the test results were within a 95% confidence interval. Consequently, a conservative factor of at least 56% can be applied to the published XOMOX torque value when evaluating stem stress. Applying this factor to the valves previously identified under this Part 21 confirmed that stress limits are below the material allowable for yield strength. This conclusion is supported by operating history (e.g., no reported stem failures) in the field.

"Based on these findings, Crane Nuclear, confirms that a condition adverse to quality and safety does not exist and that a Part 21 no longer applies. CNI, requests this Part 21 to be retracted.

"Should you have any questions regarding this matter, please contact me, [ redacted, contact info at the NRC link ]
 
Notified R1DO (McKinley), R2DO (Sandal), R3DO (Duncan), R4DO (Groom) and Part 21/50.55 Reactors via email.

[ The units identified as part of the EN were ]

TN_Sequoyah_1;2
PA_Susquehanna_1;2
TX_Comanche Peak_1;2
CT_Millstone_2;3
TX_South_Texas_1;2
NY_NineMilePoint_1;2
NY_Fitzpatrick_1
NE_FtCalhoun_1

TN_Hartsville_1;2
TN_PhippsBend_1;2;3;4
MI_Midland_1;2

[ While Crane declares there's no problem the question is: What prompted the investigation ? ]

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

NY_NineMilePoint_1 @ 85 % - down from 100 % yesterday recovering from  2 day shutdwn. No EN. Shutdown reason unk.

MA_Pilgrim_1 is still shutdown, 16th day.
OFF-SITE POWER UNAVAILABLE DUE TO WINTER STORM     
https://www.nrc.gov/reading-rm/doc-colle...ml#en53259

[ There's gotta be more going on than just loss of offsite power. ]
 
AL_BrownsFerry_1 @ 24% up from 0 % yesterdday, recovering from 3 day shutdown.  
AUTOMATIC REACTOR SCRAM DUE TO TURBINE CONTROL VALVE CLOSURE     
https://www.nrc.gov/reading-rm/doc-colle...ml#en53269

IL_La_Salle_1 @ 24 % - No EN, unk reson for power drop, RFO exit on March 17.


CA_DiabloCanyon_2 @ 7 % restarting after RFO, RFO used 39 of typical 33 days.

posted by Staup Knewkinus a Dane Gerous production. All human rights reserved.
Pia
just pm me if needed.
 
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