PLA-6231, Proposed License Amendment No. 285 for Unit 1 and Proposed License Amendment No. 253 for Unit 2, Extended Power Uprate Application Electrical Engineering Technical Review Request for Additional Information Response Supplement, PLA-6231

Proposed License Amendment No. 285 for Unit 1 and Proposed License Amendment No. 253 for Unit 2, Extended Power Uprate Application Electrical Engineering Technical Review Request for Additional Information Response Supplement, PLA-6231

ML071860142
Person / Time
Site:	Susquehanna   (NPF-014, NPF-022)
Issue date:	06/20/2007
From:	Mckinney B Susquehanna
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
PLA-6231
Download: ML071860142 (7)

Text

Brltt T. McKinney Sr. Vice President & Chief Nuclear Officer JUN 2 0 2007 PPL Susquehanna, LLC 769 Salem Boulevard Berwick, PA 18603 Tel. 570.542.3149 Fax 570.542.1504 btmckinney@pplweb.com U

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U.-TM 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: ELECTRICAL ENGINEERING TECHNICAL REVIEW REQUEST FOR ADDITIONAL INFORMATION RESPONSE SUPPLEMENT PLA-6231 Docket Nos. 50-387 and 50-388 References. 1)

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

2) PPL Letter PLA-6195, 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: Electrical Engineering Review (TAC Nos. MD3309 and MD331 0),"

dated April 12, 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).

The purpose of this letter is to provide supplemental responses to the RAI's transmitted to NRC in Reference 2 based on teleconference held with the NRC staff on June 7, 2007.

2 -

Document Control Desk PLA-6231 The Enclosure contains the supplemental information.

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:

-,9a 0o B. T. McKinney

Enclosure:

Supplement to Electrical Engineering Technical Review Request for Additional Information Responses Copy:

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

Enclosure to PLA-6231 Supplement to Electrical Engineering Technical Review Request for Additional Information Responses

Attachment to PLA-6231 Page 1 of 3 NRC Ouestion 1:

(Regarding PPL Response 4 of Ref~efence 2) - Define the Emergency Minimum, Load Dump Minimum, and Voltage Drop Limit voltages. Als'o,prowde the time durations for these minimum voltages before manual or automatic actions are taken. If the switchyard voltage is equal to the Emergency Minimum, Load Dump Minimum, or Voltage Drop Limit voltage, provide the corresponding minimum voltage at 4160 V safety buses in the plant for a loss of coolant-accident (LOCA) in one of the unit and non-LOCA normal conditions in the other. The purpose of this information is to evaluate how the degraded voltage protection would act under various voltage conditions in switchyard.

PPL Response 1:

The definition and time to correct for Normal Low, Emergency Low and Load Dump voltage conditions are contained in PJM Manual M-3. Section 3: Voltage & Stability Operating Limits contains the relevant information. PJM Manual M-3 can be obtained over the internet at the following URL:

http://www.pjm.com/contributions/pj m-manuals/pdf/m03.pdf The LOCA case considers T-20 out of service and the 230 kV switchyard voltage at 216.7 kV. This is a more conservative value than what is specified in the PJM manual.

If the SSES switchyard monitored buses are at or below the SSES allowable minimum, the transmission operator is required to notify SSES. Therefore, demonstration of the plant 4kv buses at voltages below 216.7kV is not required. The plant voltage drop is monitored by the transmission operator and the transmission owner which provide notification to SSES for voltage drop violations at the SSES monitored switchyard buses.

For plant configurations that limit the allowable voltage drop such as for a plant start-up transformer out of service the transmission owner provides this monitoring and notification to SSES.

With this switchyard voltage, the SSES ESS buses will be at the following voltages post-LOCA:

Unit 1 Unit 2 Bus Voltage Bus Voltage 1A201 3984 2A201 3946 1A202 3954 2A202 3955 1A203 3954 2A203 3955 1A204 3946 2A204 3946

Attachment to PLA-6231 Page 2 of 3 NRC Question 2:

(Regarding PPL Response 6 of Reference 2) - The staff has reviewed the impact studies performed by PJM corresponding to Susquehanna extended power uprate (EPU). Please explain the MW electric generation and main generator MVA rating discrepancies as noted below:

In the impact study M 1I performed by PJM for Susquehanna Unit 1, it is stated that the unit's new gross out will be 1304 MW. Further, it is stated that at 1304 MW, the unit is capable of producing 425 MVARs lagging. Based on this, the generator rating equates to 1371.5 MVA.

Similarly, in the impact study M12 performed by PJM for Susquehanna Unit 2, it is stated that the unit's new gross out will be 1306 MW. Further, it is stated that at 1306 MW, the unit is capable of producing 425 MVARs lagging. Based on this, the generator rating equates to 1373.4 MVA.

According to Attachment 11 to LAR, the electrical output of each unit is 1300 MW; whereas according to impact studies M 11 and M12 by PJM, the electrical output of Unit 1 will be 1304 MW, and the electrical output of Unit 2 will be 1306 MW. Please explain the MW discrepancies.

According to the LAR, the generators are rated 1354 MVA; whereas according to impact studies M 11 and M12 by PJM, the Unit 1 generator is capable of producing 1371.5 MVA (as noted above), and the Unit 2 generator is capable of producing 1373.4 MVA (as noted above). Please explain the main generator MVA rating discrepancies.

PPL Response 2:

The 1300 MWe gross output cited in the CPPU license amendment request is a nominal targeted generator output. PJM was given slightly more conservative output ratings for their evaluations. It is expected that actual generation at CPPU condition will be controiled at approximately 1300 MWe.

The MVA ratings cited in the PJM studies are the result of PJM's interpretation of the generator capability curves. The generator capability curves were provided to PJM.

Generator data which includes capability curves is periodically supplied to PJM to ensure their data base on generators is current. A copy of the SSES generator capability curve provided to PJM is attached.

Attachment to PLA-6231 Page 3 of 3 NRC Question 3:

(Regarding PPL Response 7 of Reference 2) - Explain in brief, the transformer manufacturer's analysis to increase the maximum cooling rating of Unit 2 main single phase transformers from 420 MVA to 450 MVA without any physical changes to the transformers.

PPL Response 3:

ABB performed an engineering thermal study of the SSES Unit 2 transformers. The study concluded that the SSES units would be suitable for loading to 450 MVA without exceeding a 65°C average winding rise, without exceeding a 80'C winding hot spot rise, and without exceeding any of the transformer component ratings. The following items were confirmed to be adequate at a 450 MVA loading:

• Tap changers

• Bushings

• Current transformers

• Tank Shield

• T-beam and core shielding

• Tank panels and bushing bosses

• CT mountings The study concluded that per IEEE standards the SSES Unit 2 transformers would have a normal life expectancy with operation at 450 MVA.

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