L-MT-09-018, Response to NRC Steam Generator Tube Integrity & Chemical Engineering Branch Request for Additional Information (RAI) Dated February 11, 2009

Response to NRC Steam Generator Tube Integrity & Chemical Engineering Branch Request for Additional Information (RAI) Dated February 11, 2009

ML090560464
Person / Time
Site:	Monticello
Issue date:	02/24/2009
From:	O'Connor T Northern States Power Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-MT-09-018, TAC MD9990
Download: ML090560464 (4)

Text

February 24,2009 L-MT-09-018 10 CFR 50.90 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Monticello Nuclear Generating Plant Docket 50-263 Renewed Facility Operating License License No. DPR-22 Response to NRC Steam Generator Tube Integritv & Chemical Engineering Branch Request for Additional Information (RAI) dated Februaw 11, 2009 (TAC No. MD9990)

References:

1.

NSPM letter to NRC, "License Amendment Request: Extended Power Uprate" (L-MT-08-052) dated November 5, 2008 (TAC No. MD9990) ML0832301 I I

2.

Email P. Tam (NRC) to G. Salamon, T. Blake, and K. Pointer (NSPM) dated February I I, 2009, "Monticello - Draft RAI from Materials Engineering re. the proposed EPU amendment (TAC No. MD9990)"

Pursuant to 10 CFR 50.90, the Northern States Power Company, a Minnesota corporation (NSPM), requested in Reference 1 an amendment to the Monticello Nuclear Generating Plant (MNGP) Renewed Operating License (OL) and Technical Specifications (TS) to increase the maximum authorized power level from 1775 megawatts thermal (MWt) to 2004 MWt.

The U. S. Nuclear Regulatory Commission (NRC) Steam Generator Tube Integrity and Chemical Engineering Branch provided a draft RAI documented in Reference 2. provides the NSPM response to this MI.

In accordance with 10 CFR 50.91, a copy is being provided to the designated Minnesota Official.

Summaw of Commitments This letter makes no new commitments and does not revise any existing commitments.

Document Control Desk Page 2 of 2 I declare under penalty of perjury that the foregoing is true and correct.

~imothflb. onnor nor Site Vice President, Monticello Nuclear Generating Plant Northern States Power Company - Minnesota Enclosure cc:

Administrator, Region Ill, USNRC Project Manager, Monticello, USNRC Resident Inspector, Monticello, USNRC Minnesota Department of Commerce

ENCLOSURE 1 MONTICELLO NUCLEAR GENERATING PLANT NSPM Response to Steam Generator and Tube Integrity & Chemical Engineering Branch RAI dated February 11,2009

NSPM Response To SG Tube Integrity and Chemical Engineerin9 Branch RAI dated Februaw I I, 2009 Our SG Tube Integrity and Chemical Engineering Branch had reviewed your 11/5/08 application for extended power uprate amendment, which references (in Enclosure

16) your submittals for the earlier application for EPU. Your May 28,2008 (Accession No. ML081490639) letter, Enclosure 3, did not display units of measure in Table 3-2, "Predicted Increase in Wear Rate due to EPU." Please clarify the units of measure for this table (i.e., is the unit of measure percent change from the current values).

NSPM Response The original title of Table 3-2 was "Average Percentage of Increase". This was covered over in the conversion from Word to Adobe. A copy of the Word Table is provided below. All values in this table are in terms of the percent increase over CLTP values.

Page 1 of 1 Condensate Feedwater Heater Drain 22.18 20.62 20.21 27.65 23.60 25.27 6.20 4.80 5.27 0.00 0.00 0.00 0.00 0.00 0.00 18.95 19.60 16.53 0.00 0.00 5.00 Note that the affected components will be replaced with the new feedwater heaters in 201 1.

This covers most of the condensate piping; from the 11 drain coolers to the 13 heaters.

This affects the piping between the 14 and 15 heaters.

The two areas affected are between the 12 heaters and the 12 drain coolers and between the 14 and 13 heaters.