• Thank you for visiting the Cafe Rad Lab Forum
  • We present & discuss radiation health, science & news
  • To keep you informed about vital nuke information.
Hello There, Guest! Login Register


MI_Palisades_2018_review
#1
MI_Palisades_2018_review

20190430 | MI_Palisades | NRC to Hold Open House to Discuss 2018 Performance of Palisades Nuclear Plant |
https://www.nrc.gov/reading-rm/doc-colle...09.iii.pdf

 May 9  Covert Township Lions Community Center, 78085 CR 378, will run from 6-7:30 p.m.

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

[ 2018 event stack ]

20181229 | MI_Palisades_1 | Exit RFO ( 62 / 23 )

20181121 | MI_Palisades_1 | DEGRADED CONDITION IDENTIFIED DURING SURFACE INSPECTION OF REACTOR HEAD NOZZLE PENETRATION |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53749
RFOD_025; RX_Mode; Refueling; Refueling

20181111 | MI_Palisades_1 | DEGRADED CONDITION DUE TO INDICATION DURING ULTRASONIC INSPECTION OF REACTOR HEAD NOZZLE PENETRATION |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53734 |
RFOD_015; RX_Mode: Refueling; Refueling

20181110 | MI_Palisades_1 | BORIC ACID IDENTIFIED ON REACTOR VESSEL HEAD PENETRATION |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53733 |
RFOD_014; RX_Mode: Refueling; Refueling

20181028 | MI_Palisades_1 | Begin RFO ( 01 / 23 )

[ unit did not recover before scheduled RFO start ]

20181014 | MI_Palisades_1 | FORCED OUTAGE-CONTROL ROD HOUSING REPAIR |
https://www.nrc.gov/reading-rm/doc-colle...014ps.html

20181014 | MI_Palisades_1 | shutdown, No EN. [ ref article/reports - leak ]


20180330 | MI_Palisades_1 | exit SD

20180327 | MI_Palisades_1 | FORCED OUTAGE CONTROL ROD DRIVE SEAL LEAKAGE REPAIR. |
https://www.nrc.gov/reading-rm/doc-colle...327ps.html

20180327 | MI_Palisades_1 | shutdown, No EN. |


20180109 | MI_Palisades_1 | PART 21 - FAILURE OF UNDER-VOLTAGE RELEASE MECHANISM |
https://www.nrc.gov/reading-rm/doc-colle...ml#en53158

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

[ This article provides a little detail for the November ENs. ]

20181118 | More repairs needed after Palisades nuclear plant inspection |
https://www.mlive.com/news/kalamazoo/ind...nd_du.html
Posted November 18, 2018 at 10:35 AM

[ cracks found in RPV head CRD nozzles. ]

On Saturday, Nov. 10, with the plant in a refueling outage,
during an NRC required bare metal visual inspection of the reactor head,
a through-wall leak was identified on a reactor vessel head control rod drive nozzle,
a NRC preliminary notification document dated Nov. 14 states.

[
 There are no links in the article to the source docs so unless you know where to go look you can't
 trace back to find other info.

 The doc mentioned is this one,
 
 Subject:  Through-Wall Leak Identified on A Reactor Vessel Head Nozzle |
 https://www.nrc.gov/docs/ML1831/ML18318A419.pdf

 This doc also does not specify which nozzle was involved.
 
 The PNO's aren't used very much, [ notice there's no PNO for Palisades March but they are a resource so I'll start
 including them in event stacks.
]

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

[
 As you can see there was an issue with Control Rod Drives,
 first in March a leak, then in October just before the RFO something with the housing.
 In both instances there was no EN, so no detail on the leak amount or specific locations.
 The problem may have been separate CRDs or the same one.

 The EN about the boric acid residue only says
 "boric acid was discovered at a CRDM [Control Rod Drive Mechanism] nozzle to reactor head penetration"
 but there's no location info.

 The two degraded condition EN's identify head penetrations 33 and 36 but state there was no boric acid residue.

 So that takes care of the 2018 info, but this has been going on for quite a while.
]

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


[ Prior to the 2017 RFO the unit was shutdown for 5 days ]

20170318 | MI_Palisades_1 | FORCED OUTAGE - SHUTDOWN FOR EXCESSIVE CRDM SEAL LEAKAGE ON CRD #13.
https://www.nrc.gov/reading-rm/doc-colle...318ps.html

[ This event was not documented in either thru either the EN or PNO pages ]

https://www.nrc.gov/reading-rm/doc-colle...tice/2017/

[ after repair the unit was restarted but kept between 60 to 70 % power until 04/23 RFO commencement. ]

[
 During the RFO an EN identified a suspect weld, but was retracted.
 There was no info identifying where the weld was.
]

20170509 | MI_Palisades_1 | Retract FAILED ULTRASONIC TESTING OF WELD |
https://www.nrc.gov/reading-rm/doc-colle...ml#en52722
RFOD_009; RX_Mode; Refueling; Refueling


[ just before the unit exited RFO  ]

20170519 | MI_Palisades_1 | CONTROL ROD DRIVE SEAL REPAIR COMPLETE
https://www.nrc.gov/reading-rm/doc-colle...519ps.html


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

[ Note in both years the CRDM seal leaks were in March. ]

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


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

[ This article contains a large list of events. I only extracted the CRDM related items. ]

20130512 | MI_Palisades | A timeline of incidents at Palisades Nuclear Power Plant since 2007 |
http://www.mlive.com/news/kalamazoo/inde...nt_14.html

August 2012 -- Palisades shut down for 18 days to repair a leak in the control rod mechanism drive

January 2012 -- Palisades shut down for 3-1/2 days to repair a wearing seal on a control rod mechanism.

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

[
 After more than 40 years of high temp and pressure coupled with neutron bombardment the Palisaddes RPV has
 been identified as being prone to embrittlement.
]
SUMMARY OF THE MARCH 19, 2013, PUBLIC MEETING WEBINAR REGARDING PALISADES
http://pbadupws.nrc.gov/docs/ML1310/ML13108A336.pdf

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

[
 Palisades was originally scheduled for permanent SD in fall 2018 but some kind of deal was made
 and the final SD has been pushed to 2022 which means it has to go thru one more RFO.
]
 
Reply
  


Forum Jump:


Browsing: 1 Guest(s)