PLA-6212, Extended Power Uprate Application Materials and Chemical Engineering Technical Review Request for Additional Information Responses

Extended Power Uprate Application Materials and Chemical Engineering Technical Review Request for Additional Information Responses

ML071620218
Person / Time
Site:	Susquehanna
Issue date:	06/01/2007
From:	Mckinney B Susquehanna
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
PLA-6212, TAC MD3309, TAC MD3310
Download: ML071620218 (5)

Text

Britt T. McKinney Sr. Vice Fresident & Chief Nuclear Officer PPL Susquehanna, LLC 769 Salem Boulevard Berwick, PA 18603 Tel. 570.542.3149 Fax 570.542.1504 btmckinney@pplweb.com

-PpI.'u JUN 0 1 2007 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop OP 1-17 Washington, DC 20555 SUSQUEHANNA STEAM ELECTRIC STATION PROPOSED LICENSE AMENDMENT NO. 285 FOR UNIT 1 OPERATING LICENSE NO. NPF-14 AND PROPOSED LICENSE AMENDMENT NO. 253 FOR UNIT 2 OPERATING LICENSE NO. NPF-22 EXTENDED POWER UPRATE APPLICATION RE:

MATERIALS AND CHEMICAL ENGINEERING TECHNICAL REVIEW REQUEST FOR ADDITIONAL INFORMATION RESPONSES PLA-6212 Docket Nos. 50-387 and 50-388

References:

1) PPL Letter PLA-6076, B. T McKinney (PPL) to USNRC, "Proposed License Amendment Numbers 285 For Unit 1 Operating License No. NPF-14 and 253 for Unit 2 Operating License No. NPF-22 Constant Pressure Power Uprate, "dated October 11, 2006.

2) Letter, R. V Guzman (NRC) to B. T McKinney (PPL),

"Request for Additional Information (RAI) -

Susquehanna Steam Electric Station, Units 1 and 2 (SSES 1 and 2) -

Extended Power Uprate Application Re: Materials and Chemical Engineering Technical Review (TAC Nos. MD3309 and MD3310), " dated April 12, 2007.

3) PPL Letter PLA-6193, B. T. McKinney (PPL) to USNRC, "Proposed License Amendment No. 285for Unit 1 Operating License No. NPF-14 and Proposed License Amendment No. 253for Unit 2 Operating License No. NPF-22 Extended Power Uprate Application Re: Materials and Chemical Engineering Technical Review Request for Additional Information Responses, "dated May 3, 2007.

Pursuant to 10 CFR 50.90, PPL Susquehanna LLC (PPL) requested in Reference 1 approval of amendments to the Susquehanna Steam Electric Station (SSES) Unit 1 and Unit 2 Operating Licenses (OLs) and Technical Specifications (TSs) to increase the maximum power level authorized from 3489 Megawatts Thermal (MWt) to 3952 MWt, an approximate 13% increase in thermal power. The proposed Constant Pressure Power Uprate (CPPU) represents an increase of approximately 20% above the Original Licensed Thermal Power (OLTP).

Document Control Desk PLA-6212 The purpose of this letter is to supplement the response to NRC Question 4 contained in the Request for Additional Information Response transmitted to NRC in Reference 3.

The Enclosure contains the PPL supplemental response.

There are no new regulatory commitments associated with this submittal.

PPL has reviewed the "No Significant Hazards Consideration" and the "Environmental Consideration" submitted with Reference 1 relative to the Enclosure. We have determined that there are no changes required to either of these documents.

If you have any questions or require additional information, please contact Mr. Michael H. Crowthers at (610) 774-7766.

I declare under perjury that the foregoing is true and correct.

Executed on:

- (- 0 B. T. McKinney

Enclosure:

Supplement to Request for Additional Information Response Copy:

NRC Region I Mr. A. J. Blarney, NRC Sr. Resident Inspector Mr. R. V. Guzman, NRC Sr. Project Manager Mr. R. R. Janati, DEP/BRP

Enclosure to PLA-6212 Supplement to Request for Additional Information Response

Enclosure to PLA-6212 Page 1 of 2 In the response to NRC Question 4 contained in Reference 3, PPL indicated that CHECWORKS model analyses will be provided by June 1, 2007.

Below is the CHECWORKS model analyses results provided in response to the NRC Question 4 of Reference 2. The NRC Question 4 of Reference 3 is provided for convenience.

NRC Question 4:

Table 10-14 in the PUSAR describes changes in the variables that affect FAC rates.

However, because the FAC rate is determined by the interactions of these variables, comparing the parameters may not indicate how they affect the FAC rate. Please discuss the effect of the EPU on the FAC rates as predicted by your CHECWORKS model, for example by providing the FAC rates for several (e.g., 5 to 10) components representing the highest predicted FAC rates before the uprate and the highest rates after the uprate (i.e., two potentially different sets of components). Include the calculated corrosion rates for comparison.

PPL Response:

The FAC rates increase as a result of the increased CPPU velocities. Though it should be noted that the overall FAC rate is also influenced by other factors, such as temperature and chemistry, that may in some cases result in a net reduction in FAC rate.

The location of the highest predicted FAC rates do not change since there is no change to the geometry from CLTP to CPPU. The below table provides the highest 10 Unit 1 and 2 predicted FAC rate components.

Description Component Name Geometry CLTP CPPU Wear Rate wear rate wear rate Percent Change (mils/yr)

(mils/yr)

Extraction to GFD-101-2-5020-T TEE 17.0 14.0

-17.7%

FWH #5 FEED WATER EI FWHtoW GBD-118-1-1000-N EXIT8.8 9.8 11.4%

FWH2 to FWH3 NOZZLE FEEDWATER 121-2-5655-N LET 10.6 8.4

-20.7%

FWH5 to RFP NOZZLE FEEDWATER RFP to DBD-101-6-1105-0 ORIFICE 17.9 13.9

-22.0%

REACTOR FWH DRAIN 90 DEG FWH to GBD-103-1-1010-E ELBOW 2.3 2.5 7.2%

FWH5 to LCV ELBOW REACTOR to EI RWCU P P

DBA-121-1-9600-N EXIT63.0 63.0 0.0%

RWCU PUMPS NOZZLE RWCU RGEN DBC-103-1-7000-N EXIT23.6 22.4 HX TUBSIDE NOZZLE 2

Enclosure to PLA-6212 Page 2 of 2 Description Component Name Geometry CLTP CPPU Wear Rate wear rate wear rate Percent Change (mils/yr)

(mils/yr)

RWCU RGEN HX to DBB-122-1-8605-0 ORIFICE 31.5 31.5 0.0%

FEEDWATER FEEDWATER RFP to DBD-201-4-1125-0 ORIFICE 24.3 18.6

-23.6%

REACTOR RWCU RGEN HX to DBB-222-2-8620-O ORIFICE 40.7 40.7 0.0%

FEEDWATER I

The first eight are Unit 1 and the last two are Unit 2 components. There are some differences in wear rates between Unit 1 and Unit 2; this is due to the line correction factors (correlation of predicted to measured values) that CHECWORKS applies to the wear rates.

For the components that CHECWORKS predicts a decrease in wear rate at CPPU conditions, it was verified that the increased velocities alone would result in a wear rate increase. Other factors (such as temperature and chemistry) cause the overall decrease.