CP-201900674, Open Phase Condition Monitoring
| ML20013F669 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 12/12/2019 |
| From: | Thomas McCool Luminant, TXU Energy, Vistra Energy |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| CP-201900674, TXX-19100 | |
| Download: ML20013F669 (3) | |
Text
CP-201900674 TXX-19100 U. S. Nuclear Regulatory Commiss.iot,.
ATIN: Document Control Desk Washington, DC 20555-0001 12/12/2019
SUBJECT:
COMANCHE PEAK NUCLEAR POW£R PLANT **
~-
DOCKET NOS. 5D-445 AND 50-446-:
OPEN PHASE CO~DlilON MONITO~ING.
Thomas P. M*cCool Site Vice President Luminarit P.O. Box 1002 6322 North FM 56 Glen Rose, TX 76043 o 254.897.6042
REFERENCES:
- 1.
}
CP-20180P312 (D:()(-18036)/ dated* July, 19, 2018; from Vi~tra.-Operations Company LLC, to NRC regardln*g Schedule Revli1o*~s\\~lated to 'a-pen P_hase Cort9!tion Monitoring (ADAMS No.
ML18218A169} *
- 2.
NEI 19-0'i,,;GUIDANCE FOR-*ASSE-SSING OPEN PHASE CONDITION IMPLEMENTATION USING RISK INSIGHTS~, (ADAM~;No:\\i1L19172Ad86)
Dear Sir or Madam:
The Reference 1 letter provided a revised schedule,fqr full implementatlc;m of. thf;! Open Phase Detection/Protection system at Comanche Peak,Nuclear Power Plant (CPNPP). At tliat time, the revised schedule date*for transitioning the CPNPP Open Phase Deite'q:"ion / Protection sy~em fr~~ rn~nitonng-only to t'rip-eni;ibled mode was changed from December 31, 2018, to_ Decem~er 31, 2019..
- As noted In Reference 1, Vistra Operations Company LLC (Vlstra Qpc;d)_ de_c,cfed t.9. J:ip~ral~ th.e Op.en_ Phase_
Detection/ Protection system in the monitoring mode through 2019 to ensure sufficien(data is*c.lptured and analyzed prior to placement of the system Into the 'trip' r,-;ode.' VIStra :OpCo' h;i'.'subie'ql,Jently c~mplet~d a risk assessment consistent with NEl-19-02 (Reference 2). The results of said analysis 'conclude a risk-ihformed
~
decision to operate in the monitoring-only mode Is supp_orted.
Accordingly, CPNPP Is updating the Information provided in the Reference 1 letter tq clarify CPNPP will henceforth be operating with the Open Phas~ Detection/ Prqtection system *ln the monitoring-only m.ode and to reflect the fact the unavailablllty of the Open Phase D~tec:tibn / Pro.~ection systerp would not require Lir,-riiting Condition for A (J/
Operation (LCO) entry due to loss ofthe applicable offslte source.
.nil 6555 SIERRA DRIVE IRVING, TEXAS 75039 0214-812-4600 VISTRAENERGY.COM
- IL~
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TXX-19100 Page '2 of 2 CPNPP operation with the Open Phase Detection/ Protection system in the mo*nltoring-only mode will not adversely impact the safe operation of CPNPP. Commitmen~ 5839799 (previously AI-TR-2016-005840-40) is updated as described in Attachment 1.
Should you have any questions, please contact Ken V~hstedt at (254) 897-6296 or Ken.Vehstedt@lumlnant.com. -Regulatory Commitfl'.le~t c -
Scott Morris, Region IV Dennis J. Galvin, NRR Resident Inspectors, Comariche Peak Sincerely,
f. Aitachment 1 to TXX-19100 Page 1 of 1 Commitment Number:
Regulatory Commitment 5839799 (previously AI-TR-2016-005840-40)
Commitment
Description:
CPNPP operation with the Open Phase Detection/ Protection system in the monitoring-only mode will be maintal~ed and will not adversely impact safe plant operation. Interim actions documented in Reference 1 will be maintained.