ML092800336

RAI Related to Alternative Source Term License Amendment Request

ML092800336
Person / Time
Site:	LaSalle
Issue date:	10/19/2009
From:	Goodwin C Plant Licensing Branch III
To:	Pardee C Exelon Nuclear
Goodwin, Cameron S, NRR/DORL, 415-3719
References
TAC ME0068, TAC ME0069
Download: ML092800336 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 October 19, 2009 Mr. Charles G. Pardee President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

LASALLE COUNTY STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO ALTERNATIVE SOURCE TERM LICENSE AMENDMENT REQUEST (TAC NOS. ME0068 - ME0069)

Dear Mr. Pardee:

By letter to the Nuclear Regulatory Commission (NRC) dated October 23, 2008 (Agencywide Documents Access and Management System Accession No. ML083100149), Exelon Generation Company, LLC, submitted a request to replace the current accident source term used in design-basis radiological analysis with an alternative source term pursuant to Title 10 of '

the Code of Federal Regulations Part 50.67, "Accident Source Term," for the LaSalle County Station, Units 1 and 2.

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 your staff on October 19, 2009, it was agreed that you would provide a response 30 days from the date of this letter.

The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRC s goal of efficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-3719.

Sincerely, Cameron S. Goodwin, 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 LASALLE COUNTY STATION, UNITS 1 AND 2 DOCKET NOS. 50-373 AND 50-374 In reviewing the Exelon Generation Company's (Exelon's) submittal dated October 23, 2008 (Agencywide Documents Access and Management System Accession No. ML083100149),

related to the request to replace the current accident source term used in design-basis radiological analysis with an alternative source term pursuant to Title 10 of the Code of Federal Regulations Part 50.67, "Accident Source Term," for the LaSalle County Station (LSCS), Units 1 and 2, the Nuclear Regulatory Commission staff has determined that the follOWing information is needed in order to complete its review:

Electrical Engineering Branch

1. Provide the loading sequence for each emergency diesel generator (EDG) at LSCS. In your response, describe the changes that have been made to the EDG loading sequence to support this license amendment request (LAR).

2. Describe how the loads being added to the LSCS EDGs (if applicable) affect the capability and capacity of the EDGs (e.g., describe the impact of the proposed change on the EDG ratings).

3. Describe how the operators will be notified in the event that the standby liquid control (SLC) system would become inoperable (e.g., control room annuciators).

4. Describe how the SLC system meets single failure criteria electrically.

5. Provide a list and description of components being added to your 10 CFR 50.49 program due to this LAR (if applicable). Confirm that these components are qualified for the environmental conditions they are expected to be exposed to.

6. The licensee proposed utilizing the SLC system to buffer suppression pool pH to prevent iodine re-evolution during a postulated release. Describe the impact of the above proposed actions on environmental conditions (such as temperature, pressure) and any impact on equipment qualification.

Enclosure

Mr. Charles G. Pardee October 19, 2009 President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

LASALLE COUNTY STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO ALTERNATIVE SOURCE TERM LICENSE AMENDMENT REQUEST (TAC NOS. ME0068 - ME0069)

Dear Mr. Pardee:

By letter to the Nuclear Regulatory Commission (NRC) dated October 23, 2008 (Agencywide Documents Access and Management System Accession No. ML083100149), Exelon Generation Company, LLC, submitted a request to replace the current accident source term used in design-basis radiological analysis with an alternative source term pursuant to Title 10 of the Code of Federal Regulations Part 50.67, "Accident Source Term," for the LaSalle County Station, Units 1 and 2.

The I'JRC 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 your staff on October 19, 2009, it was agreed that you would provide a response 30 days from the date of this letter.

The I'JRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRC's goal of efficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-3719.

Sincerely, IRAJ Cameron S. Goodwin, 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 R/F RidsNrrDorlLpl3-2 Resource RidsNrrPMLaSalie Resource RidsNrrLATHarris Resource RidsNrrDorlDpr Resource RidsOgcRp Resource RidsRgn3MailCenter Resource RidsAcrsAcnw_MailCTR Resource ADAMS Accession No. ML092800336 I'JRR-088 OFFICE LPL3-2/PM LPL3-2/LA LPL3-2/BC MDavid for NAME CGoodwin THarris SCampbeli DATE 10/19/09 10/15/09 10/19/09 OFFICIAL RECORD COpy