CP-200901406, Update of Commitment Regarding Equipment Qualification Bounding Post LOCA Profiles

Update of Commitment Regarding Equipment Qualification Bounding Post LOCA Profiles

ML093020119
Person / Time
Site:	Comanche Peak
Issue date:	10/22/2009
From:	Flores R Luminant Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CP-200901406, TXX-09130
Download: ML093020119 (4)

Text

Rafael Flores Luminant Power Senior Vice President P 0 Box 1002

& Chief Nuclear Officer 6322 North FM 56 Luminant rafael.flores@Luminant.corn Glen Rose, TX 76043 T 254 897 5550 C 817 5590,403 F 254 897 6652 CP-200901406 TXX-09130 October 22, 2009 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION DOCKET NOS. 50-445 AND 50-446 UPDATE OF COMMITMENT REGARDING EQUIPMENT QUALIFICATION BOUNDING POST LOCA PROFILES

REFERENCE:

1. Letter logged TXX-08031, dated February 21, 2008, from Mike Blevins of Luminant Power to the NRC.

2. Letter logged TXX-08067, dated April 17, 2008, from Mike Blevins of Luminant Power to the NRC.

Dear Sir or Madam:

Per letter TXX-08031 (Reference 1), Luminant Generation Company LLC (Luminant Power) committed to incorporate bounding pressure and temperature profiles for Comanche Peak Steam Electric Station, herein referred to as Comanche Peak Nuclear Power Plant (CPNPP), equipment qualification (EQ) into design drawings (commitment number 3458484) regarding CPNPP Units 1 and 2. This was completed for Unit 1. Consistent with this commitment, revised pressure and temperature profiles will be incorporated into design drawings in support of Unit 2 operation prior to start-up from the current refueling outage.

Per Reference 2, Luminant Power provided a commitment (commitment number 3495809) to incorporate bounding post-Loss of Coolant Accident (LOCA) containment temperature and pressure profiles for EQ regarding CPNPP Units I and 2 (same as commitment number 3458484), update EQ packages, and provided data points for the pressure and temperature curves. Subsequent analyses have been performed for bounding post-LOCA containment temperature and pressure profiles for EQ. The need to update the Unit 1 pressure and temperature profile has been identified within the CPNPP corrective action program. The peak pressure and temperatures are below the levels currently evaluated for CPNPP Units 1 and 2. There are no points on the LOCA curves that exceed the profiles developed for EQ. The revised Units 1 and 2 pressure and temperature profile curves are provided, for information only, in the attachment to this letter. Subsequently, EQ packages will be updated to reflect completed evaluations using the revised pressure and temperature profiles.

A member of the STARS (Strategic Teaming and Resource Sharing) Alliance R Callaway

• Comanche Peak . Diablo Canyon ' Palo Verde . San Onofre

• South Texas Project - Wolf Creek

U. S. Nuclear Regulatory Commission TXX-09130 Page 2 10/22/2009 This communication contains the following revised commitment regarding Comanche Peak Unit 2.

Number Commitment 3495809 EQ packages will subsequently be updated to reflect completed evaluations using the revised pressure and temperature profiles.

Should you have any questions, please contact J. D. Seawright at (254) 897-0140.

Sincerely, Luminant Generation Company LLC Rafael Flores By: _ _ _ _ _ _ _

Fred W. Madden Director, Oversight & Regulatory Affairs Attachment - Revised Bounding Profiles c- E. E. Collins, Region IV B. K. Singal, NRR Resident Inspectors, Comanche Peak

Attachment to TXX-09130 Page 1 of 2 CPNPP Containment Temperature Envelope CONTAINMENT TEMPERATURE Vs TIME (LOCA CASES) 4"^

350 3000 230 -

200 -

150- ___

IC L H

100 -_____

I:-

0 0

50- ____ __________

1 0 -~ r--Irr -rm -- rT-1 ---- lr,-Trr T~~ 1~1h nrrT IE-02 I0-01 IE+00 1E+61 IE+02 1104ý03 IE-404 IE+05 1E+066 IE+07 TIME (seconds)

Attachment to TXX-09130 Page 2 of 2 CPNPP Containment Pressure Envelope CONTAINMENT PRESSURE VS TIME'(LOCA CASES) 70 60 50 Dr -

F

~40 30' FB_____

S20 4,K__

________~I,_ __ _

30 0

IE-02 IE-0I .IE+00 IE+01 1E+02 IE+03 .1E+04 IE+05 I E+06 IE+07 TIME (seconds)