ML110260371

Request for Additional Information, Related to Request to Incorporate Revised Pressure/Temperature Curves

ML110260371
Person / Time
Site:	LaSalle
Issue date:	02/04/2011
From:	Ellen Brown Plant Licensing Branch III
To:	Pacilio M Exelon Nuclear
Brown Eva, NRR/DORL, 415-2315
References
TAC ME3801, TAC ME3802, RS-10-080
Download: ML110260371 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 February 4, 2011 Mr. Michael J. Pacilio President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville,lL 60555

SUBJECT:

LASALLE COUNTY STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO REQUEST TO INCORPORATE REVISED PRESSUREITEMPERATURE CURVES (TAC NOS. ME3801 AND ME3802)(RS 10-080)

Dear Mr. Pacilio:

By letter to the Nuclear Regulatory Commission (NRC) dated April 19, 2010 (Agencywide Documents Access and Management Systems (ADAMS) Accession No. ML101130370) as supplemented in a letters dated October 5 and 15, 2010 (ADAMS Accession Nos.

ML102790014 and ML102910355, respectively), Exelon Generation Company, LLC submitted a request for the proposed amendments that would revise Technical Specification 3.4.11, "RCS Pressure and Temperature (PIT) Limits," to incorporate revised PIT curves that are valid for up to 32 effective full power years of operation.

The NRC staff is reviewing your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with Mr. Mitchel Mathews of your staff on February 1, 2011, it was agreed that a response would be provided by March 23, 2011.

M. Pacilio -2 Please note that if you do not respond to this letter within the prescribed response time or provide an acceptable alternate date in writing, we may reject your application for amendment under the provisions of 10 CFR Section 2.108. Should you need to contact me, I can be reached at (301) 415-2315.

Sincerely, IRA!

Eva A. Brown, Senior Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-373 and 50-374

Enclosure:

Request for Additional Information cc w/encl: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION (RAn PRESSURE TEMPERATURE CURVES EXELON GENERATION COMPANY, LLC LASALLE COUNTY STATION (LSCS), UNITS 1 AND 2 DOCKET NOS. 50-373 AND 50-374

1. In the submittal dated October 18, 2010, the response to RAI-1 stated that, "GEH performed an impact assessment that demonstrated for LSCS Units 1 and 2 the [water level instrument] Wli nozzle curves are bounded by the beltline and upper vessel curves provided in reports GE-NE-0000-0003-5526-02R1a (Unit 1) and GE-NE-0000-0003 5526-01 R1 a (Unit 2)." Provide this impact assessment ensuring that the following is addressed:

a. The materials of the Wli nozzle and the weld that attached the nozzle to the reactor pressure valve;

b. The upper-shelf energy status of the Wli nozzle if it is ferritic; and

c. The type of the welding, i.e., full penetration or half penetration.

ENCLOSURE

-2 Please note that if you do not respond to this letter within the prescribed response time or provide an acceptable alternate date in writing, we may reject your application for amendment under the provisions of 10 CFR Section 2.108. Should you need to contact me, I can be reached at (301) 415-2315.

Sincerely, IRA!

Eva A. Brown, Senior Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-373 and 50-374

Enclosure:

Request for Additional Information cc w/encl: Distribution via Listserv DISTRIBUTION:

PUBLIC LPL3-2 R1F RidsNrrDorlLpl3-2 Resource RidsNrrPMLaSalie Resource RidsNrrLARohrer Resource RidsNrrDorlDpr Resource RidsOgcRp Resource RidsRgn3MailCenter Resource SSheng RidsNrrDciCvib RidsAcrsAcnw_MailCTR Resource RidsNrrLASRohrer ADAMS Accession No. ML110260371 NRR-088 OFFICE LPL3-2/PM LPL3-2/LA LPL3 CVIB\BC 2/BC NAME EBrown SRohrer MMitchell(SSHeng for) RCarlson DATE 2/1/11 1/31/11 2/1111 2/4/11