Some Comanche Peak NRC Event Logs in 2016 Somervell County Salon-Glen Rose, Rainbow, Nemo, Glass....Texas


 

Some Comanche Peak NRC Event Logs in 2016
 


13 May 2016 at 4:17:50 PM
salon

From NRC.GOV Events

April 29 2016

Power Reactor Event Number: 51871
Facility: COMANCHE PEAK
Region: 4 State: TX
Unit: [1] [ ] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: ROBERT DANIELS
HQ OPS Officer: JEFF HERRERA
Notification Date: 04/19/2016
Notification Time: 19:54 [ET]
Event Date: 04/19/2016
Event Time: 13:43 [CDT]
Last Update Date: 04/19/2016
Emergency Class: NON EMERGENCY
10 CFR Section: 
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization): 
HEATHER GEPFORD (R4DO)

 

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation

Event Text

MAIN STEAM LINE RADIATION DETECTOR DETERMINED TO BE NON FUNCTIONAL 

"While performing a monthly check source on radiation monitor 1-RE-2328 (Main Steamline 1-04 Radiation Detector), the monitor was determined to be non-functional. With this radiation monitor non-functional, all of the emergency action levels for a steam generator tube rupture in steam generator 1-04 could neither be evaluated nor monitored. This unplanned condition is reportable as a major loss of assessment capability per 10 CFR 50.72(b)(3)(xiii). 

"Comanche Peak Nuclear Power Plant [CPNPP] has assurance of steam generator integrity and fuel cladding integrity and there is a negligible safety significance to the current condition from a public health and safety perspective. 

"Additionally, compensatory measures are in place to assure adequate monitoring capability is available to implement the CPNPP emergency plan in the unlikely event of challenges to the steam generator or fuel cladding. 

"Until this radiation monitor can be restored, Operations has implemented compensatory measures to monitor main steamline 1-04 N16 Radiation Monitor for early signs of a steam generator tube leak/rupture, pre-brief radiation protection technicians on taking local readings with a geiger-mueller tube on main steam line 1-04 and reporting the reading to the Control Room. 

"Corrective actions are being pursued to restore 1-RE-2328 to functional status." 

The NRC Resident Inspector has been notified.

 Feb 23 2016

!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor Event Number: 51751
Facility: COMANCHE PEAK
Region: 4 State: TX
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: ANTHONY PATE
HQ OPS Officer: STEVE SANDIN
Notification Date: 02/23/2016
Notification Time: 20:45 [ET]
Event Date: 02/23/2016
Event Time: 17:00 [CST]
Last Update Date: 02/27/2016
Emergency Class: NON EMERGENCY
10 CFR Section: 
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization): 
JACK WHITTEN (R4DO)

 

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

UNANALYZED CONDITION INVOLVING NORMALLY OPEN BATTERY ROOM DOORS 

"At CPNPP [Comanche Peak Nuclear Power Plant], eyewash stations are located just outside of the Class 1E battery rooms. The battery room doors are normally open and if a MELB [Moderate Energy Line Break] occurred on the demineralized water line connected to the eyewash station, the water could potentially spray onto the Class 1E safety related batteries. If this occurred, an electrical short could potentially cause a loss of both the batteries and the associated battery chargers. 

"This condition has been conservatively determined to be reportable per 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. Currently, the demineralized water lines on the battery room eyewash stations for both Units 1 and 2 have been isolated, therefore, all safety related equipment is currently operable. Comanche Peak Engineering is performing a past operability review of this condition. 

"The NRC Resident Inspector has been notified." 

* * * RETRACTION AT 1821 EST ON 02/27/2016 FROM DANNY BRADFORD TO JEFF HERRERA * * * 

"On February 23, 2016 at 2045 [EST], Comanche Peak reported an unanalyzed condition per 10 CFR 50.72(b)(3)(ii)(B). Specifically, the reported condition involved eyewash stations that are located just outside of the Class 1E battery rooms. The battery room doors are normally open and if a Moderate Energy Line Break (MELB) occurred on the demineralized water line connected to the eyewash station, the water could potentially spray onto the Class 1E safety related batteries. If this occurred, an electrical short could have potentially caused a loss of both the batteries and the associated battery chargers. This condition was conservatively determined to be reportable per 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition. The demineralized water lines on the battery room eyewash stations for both Units 1 and 2 were isolated, and Comanche Peak Engineering initiated a past operability evaluation of this condition. 

"The past operability evaluation has been completed and shows that there are no operability concerns regarding a MELB impact on the Class 1E batteries, DC bus or Class 1E battery chargers. Therefore, Comanche Peak requests that the February 23, 2016, 10 CFR 50.72(b)(3)(ii)(B) reportable event for Units 1 & 2 be retracted." 

The NRC Resident Inspector has been notified. 

Notified the R4DO (Whitten).

2/9/2016

ower Reactor Event Number: 51717
Facility: COMANCHE PEAK
Region: 4 State: TX
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: JOHN RASMUSSEN
HQ OPS Officer: STEVEN VITTO
Notification Date: 02/09/2016
Notification Time: 09:54 [ET]
Event Date: 02/09/2016
Event Time: 08:12 [CST]
Last Update Date: 02/18/2016
Emergency Class: NON EMERGENCY
10 CFR Section: 
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization): 
NEIL OKEEFE (R4DO)

 

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

PLANNED MAINTENANCE OF THE PLANT COMPUTER SYSTEM 

"Planned maintenance of the Plant Computer System (PCS) will cause a loss of emergency assessment capability. 

"Beginning February 9, 2016, PCS data will not be available to the following Comanche Peak Nuclear Power Plant (CPNPP) facilities due to planned PCS software modifications: 
-Emergency Operations Facility [EOF] 
-Backup EOF 
-Operations Support Center 

"The Emergency Response Data System [ERDS] will also be unavailable. 

"The planned maintenance of the PCS is being reported as a loss of assessment capability in accordance with 10 CFR 50.72(b)(3)(xiii) because the duration is expected to be more than 72 hours and the data to the Backup EOF is also affected. 

"CPNPP has compensatory measures in place to ensure timely emergency classification, protective action recommendation and emergency notification, as needed. 

"The PCS modification is expected to be complete by February 18, 2016. A follow-up ENS [Emergency Notification System] communication will be made when the EOF assessment capability is restored." 

The Licensee has notified the NRC Resident Inspector. 


* * * UPDATE FROM RAUL MARTINEZ TO STEVEN VITTO ON 02/18/2016 AT 1541 EST * * * 

"The planned maintenance of the Comanche Peak Plant Computer System (PCS) that began on February 9, 2016 is complete. 

"Assessment capability in the following facilities was restored effective 1300 [CST] February 18, 2016: 

-Emergency Operations Facility (EOF) 
-Backup EOF 
-Operations Support Center 

"The Emergency Response Data System availability has also been restored." 

The Licensee has notified the NRC Resident Inspector. 

Notified the R4DO(Werner).

 1/7/2016

Power Reactor Event Number: 51639
Facility: COMANCHE PEAK
Region: 4 State: TX
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: JAY LLOYD
HQ OPS Officer: JEFF ROTTON
Notification Date: 01/07/2016
Notification Time: 14:16 [ET]
Event Date: 01/07/2016
Event Time: 07:59 [CST]
Last Update Date: 01/07/2016
Emergency Class: NON EMERGENCY
10 CFR Section: 
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization): 
VIVIAN CAMPBELL (R4DO)

 

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

LOSS OF BOTH METEOROLOGICAL TOWERS DUE TO POWER SYSTEM FAILURE 

"At 0759 CST on 01/07/2016, a partial loss of the 25kV Plant Support Power Distribution System caused an unplanned loss of both primary and backup meteorological towers at Comanche Peak Nuclear Power Plant. Loss of both meteorological towers constitutes a major loss of emergency assessment capabilities in regard to meteorological conditions. During the power loss, the National Weather Service was available to compensate for the on-site data loss. The 25kV system and both meteorological towers were restored at 0923 CST on 01/07/2016. 

"The 25kV Plant Support Power Distribution System feeds non-safety related equipment and does not affect plant operation, with the exception already described. The fault occurred due to an aged stress cone and faulty lightning arrestor. The fault was isolated and power was restored." 

The licensee notified the NRC Resident Inspector.

 


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