ML13009A211

Request for Additional Information for the Review of the Callaway Plant 1 License Renewal Application

ML13009A211
Person / Time
Site:	Callaway
Issue date:	01/14/2013
From:	Cuadradodejesus S License Renewal Projects Branch 1
To:	Heflin A Union Electric Co
Cuadrado, S D, 415-2946
References
TAC ME7708
Download: ML13009A211 (5)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 January 14, 2013 Mr. Adam C. Heflin Senior Vice President and Chief Nuclear Officer Union Electric Company P.O. Box 620 Fulton, MO 65251

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE CALLAWAY PLANT UNIT1 LICENSE RENEWAL APPLICATION, SET 20 (TAC NO. ME7708)

Dear Mr. Heflin:

By letter dated December 15, 2011, Union Electric Company d/b/a Ameren Missouri (the applicant) submitted an application pursuant to Title 10 of the Code of Federal Regulations Part 54 (10 CFR Part 54) for renewal of Operating License No. NPF-30 for the Callaway Plant Unit 1 (Callaway). The staff of the U.S. Nuclear Regulatory Commission (NRC or the staff) is reviewing this application in accordance with the guidance in NUREG-1800, "Standard Review Plan for Review of License Renewal Applications for Nuclear Power Plants." During its review,

. the staff has identified areas where additional information is needed to complete the review.

The staff's requests for additional information are included in the enclosure. Further requests for additional information may be issued in the future.

Items in the enclosure were discussed with Sarah G. Kovaleski, of your staff, and a mutually agreeable date for the response is within 30 days from the date of this letter. If you have any questions, please contact me by telephone at 301-415-2946 or bye-mail at Samuel.CuadradoDeJesus@nrc.gov.

Sincerely, iLad~i.~ Manager aaT~cts Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-483

Enclosure:

As stated cc w/encl: Listserv

CALLAWAY PLANT UNIT 1 LICENSE RENEWAL APPLICATION REQUEST FOR ADDITIONAL INFORMATION, SET 20 RAI B2.1.14-5b

Background:

The staff reviewed the applicant's response to request for additional information (RAI)

B2.1.14-5a and has questions related to flow testing of the fire water system. In addition, while credited in the RAI response, trending of the microbiologically influenced corrosion (MIC) Index was not incorporated into the Fire Water System Program.

As described in the RAI response, the staff understands the following in relation to fire water system flow testing:

• Failure of the flow test in 2004 was attributed to accumulated corrosion products. The corrective action was to conduct chemical cleaning in 2006 and the subsequent flow test met acceptance criteria.

• Failure of the flow test in 2009 was attributed to a combination of factors related to the test procedure and calculation such as gauge elevation, rounding error, and rerouting of fire piping. Upon revision of the calculation and flow test procedure, the flow test met acceptance criteria.

• Failure of the flow test in 2011 was attributed to unnecessary conservatisms in the flow calculation such as how much additional flow was assumed to hose stations and yard hydrants coincident with sprinkler demand as compared to the licensing basis value.

Additionally, the calculation used to determine pipe wall cleanliness was rewritten, including taking credit for actual fire pump performance. Upon revision of the calculations, the flow test met acceptance criteria.

Issue:

a) Although contributing factors to the flow test failures have been identified and the procedure used to verify operability has been revised, the test results indicate that the condition of the fire main is degrading. Specifically, the 2006 flow test was passed without the changes to the test procedures and calculations which were implemented to pass the 2009 and 2011 test results. Likewise, the 2009 flow test passed without the changes to the calculations which were implemented to pass the 2011 test results. Additionally, some of the procedure changes removed margin instead of correcting test process inaccuracies.

The proposed changes to the program, including continued chemical additions to the fire water system to mitigate biological growth and augmented wall thickness inspections, ,do not resolve the staff's concern related to the flow degradation in the system.

-2 The response to RAI B2.1.14-5a, part (c) states that the program collects MIG samples and trends the MIG Index to evaluate treatment effectiveness in specific locations. However, although the amended Fire Water System Program discusses MIG sampling, it does not include MIG Index trending.

Request:

a) In light of the decreasing trend in system performance, state the basis for why flow testing of the system every 3 years will be sufficient to ensure that the system can perform its intended function during the period of extended operation.

b) Revise LRA Section B2.1.14 to include MIG Index trending.

January 14, 2013 Mr. Adam C. Heflin Senior Vice President and Chief Nuclear Officer Union Electric Company P.O. Box 620 Fulton, MO 65251

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE CALLAWAY PLANT UNIT 1 LICENSE RENEWAL APPLICATION, SET 20 (TAC NO. ME7708)

Dear Mr. Heflin:

By letter dated December 15, 2011, Union Electric Company dlbla Ameren Missouri (the applicant) submitted an application pursuant to Title 10 of the Code of Federal Regulations Part 54 (10 CFR Part 54) for renewal of Operating License No. NPF-30 for the Callaway Plant Unit 1 (Callaway). The staff of the U.S. Nuclear Regulatory Commission (NRC or the staff) is reviewing this application in accordance with the guidance in NUREG-1800, "Standard Review Plan for Review of License Renewal Applications for Nuclear Power Plants." During its review, the staff has identified areas where additional information is needed to complete the review.

The staff's requests for additional information are included in the enclosure. Further requests for additional information may be issued in the future.

Items in the enclosure were discussed with Sarah G. Kovaleski, of your staff, and a mutually agreeable date for the response is within 30 days from the date of this letter. If you have any questions, please contact me by telephone at 301-415-2946 or bye-mail at Samuel.CuadradoDeJesus@nrc.gov.

Sincerely, IRA!

Samuel Cuadrado de Jesus, Project Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-483

Enclosure:

As stated cc w/encl: Listserv DISTRIBUTION:

See next page ADAMS Accession No.: ML13009A211 *concurrence via e-mail OFFICE LA:DLR/RPB1* PM:DLR/RPB1 BC:DLR/RPB1 PM:DLR/RPB1 YEdmonds SCuadrado DMorey SCuadrado 1/4/2013 1/9/2013 12013 1/14/2013 OFFICIAL RECOR===D=C==O==P===y~~======l

Letter to A. Heflin from S. Cuadrado de Jesus dated January 14, 2013

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE CALLAWAY PLANT UNIT 1 LICENSE RENEWAL APPLICATION, SET 20 (TAC NO. ME7708)

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