ML13129A333

Request for Additional Information, License Amendment Request to Revise Technical Specification (TS) 3.7.9, Ultimate Heat Sink (UHS)

ML13129A333
Person / Time
Site:	Callaway
Issue date:	05/13/2013
From:	Lyon C Plant Licensing Branch IV
To:	Heflin A Union Electric Co
Lyon C
References
TAC MF0378
Download: ML13129A333 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 May 13, 2013 Mr. Adam C. Heflin Senior Vice President and Chief Nuclear Officer Union Electric Company P.O. Box 620 Fulton, MO 65251

SUBJECT:

CALLAWAY PLANT, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION RE: PROPOSED REVISION TO TECHNICAL SPECIFICATION 3.7.9, "ULTIMATE HEAT SINK (UHSr (TAC NO. MF0378)

Dear Mr. Heflin:

By application dated December 13, 2012 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML12349A321), to the U.S. Nuclear Regulatory Commission (NRC), Union Electric Company (dba Ameren Missouri, the licensee) submitted a license amendment request to incorporate more restrictive ultimate heat sink (UHS) level and pond temperature limits, which are specified in Surveillance Requirements (SRs) 3.7.9.1 and 3.7.9.2, respectively. In addition, new SR 3.7.9.4 would be added to verify that the UHS cooling tower fans respond appropriately to automatic start signals.

The NRC staff has determined that additional information, as requested in the enclosure, is needed to complete its review. Please provide a response to the questions within 30 days of the date of this letter. If circumstances result in the need to revise the requested response date, please contact me at 301-415~2296 or via e-mail at Fred.Lyon@nrc.gov.

Sincerely, Carl F. Lyon, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50~483

Enclosure:

As stated cc w/encl: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION LICENSE AMENDMENT REQUEST TO REVISE TS 3.7.9 UNION ELECTRIC COMPANY CALLAWAY PLANT. UNIT 1 DOCKET NO. 50-483 By application dated December 13, 2012 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML12349A321), to the U.S. Nuclear Regulatory Commission (NRC), Union Electric Company (dba Ameren Missouri, the licensee) submitted a license amendment request to incorporate more restrictive ultimate heat sink (UHS) level and pond temperature limits which are specified in Surveillance Requirements (SRs) 3.7.9.1 and 3.7.9.2, respectively. In addition, new SR 3.7.9.4 would be added to verify that the UHS cooling tower fans respond appropriately to automatic start signals.

The NRC staff has determined that the additional information requested below is needed to complete its review.

1. The licensee stated on page 4 of the application that the UHS minimum water depth of 831.25 feet, as stated in the Callaway Safety Evaluation Report (SER),

NUREG-0830, Supplement 4, Section 2.4.4, was previously accepted by the staff in 1984. However, due to the licensee's reassessment of the UHS based upon its National Pollutant Discharge Elimination System (NPDES) Permit, the licensee now proposes to increase the UHS minimum water depth to 834 feet.

Please provide justification for the reassessment of the UHS minimum water level from 831.25 feet to 834 feet, since it is not sufficiently described in the application. Describe any physical changes to the UHS design analysis methodology or operation that would allow the calculation of the UHS freeboard to show that UHS discharge at nearly 835.83 feet is now negligible.

Enclosure

May 13, 2013 Mr. Adam C. Heflin Senior Vice President and Chief Nuclear Officer Union Electric Company P.O. Box 620 Fulton, MO 65251

SUBJECT:

CALLAWAY PLANT, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION RE: PROPOSED REVISION TO TECHNICAL SPECIFICATION 3.7.9, "ULTIMATE HEAT SINK (UHS)" (TAC NO. MF0378)

Dear Mr. Heflin:

By application dated December 13, 2012 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML12349A321), to the U.S. Nuclear Regulatory Commission (NRC), Union Electric Company (dba Ameren Missouri, the licensee) submitted a license amendment request to incorporate more restrictive ultimate heat sink (UHS) level and pond temperature limits, which are specified in Surveillance Requirements (SRs) 3.7.9.1 and 3.7.9.2, respectively. In addition, new SR 3.7.9.4 would be added to verify that the UHS cooling tower fans respond appropriately to automatic start signals.

The NRC staff has determined that additional information, as requested in the enclosure, is needed to complete its review. Please provide a response to the questions within 30 days of the date of this letter. If circumstances result in the need to revise the requested response date, please contact me at 301-415-2296 or via e-mail at Fred.Lyon@nrc.gov.

Sincerely, IRA by N. Kalyanam forI Carl F. Lyon, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-483

Enclosure:

As stated cc w/encl: Distribution via Listserv DISTRIBUTION:

PUBLIC RidsNrrDorlLpl4 Resource RidsNrrPMCallaway Resource LPLIV Reading RidsNrrDssSbpb Resource RidsRgn4MailCenter Resource RidsAcrsAcnw_MailCTR Resource RidsNrrLAJBurkhardt Resource GArmstrong, NRRIDSS/SBPB ADAMS Accession No.: ML13129A333 *email dated FICE NRRlDORULPL4/PM NRRlDORUL

=

RRlDSS/SBPB/B NRRlDORULPL4/BC FLyon (NKalyanam NAME FLyon JBurkhardt GCasto* MMarkley for)

DATE 10/13 5/10/13 4129/13 5/13/13 5/13/13 OFFICIAL RECORD COpy