ML120720331

(Non-Proprietary) Request for Additional Information, Nrr/De/Emcb Review of Steam Dryer, Round 6, Amendment Request for Extended Power Uprate to Increase Maximum Reactor Core Power Operating Limit from 3898 to 4408 Mwt

ML120720331
Person / Time
Site:	Grand Gulf
Issue date:	03/21/2012
From:	Wang A Plant Licensing Branch IV
To:	Entergy Operations
Wang, A B, NRR/DORL/LPLIV, 415-1445
Shared Package
ML120720312	List: ML120720331
References
TAC ME4679
Download: ML120720331 (15)

Text

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• PROPRIETAR¥ INFOftMMION UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON. D.C. 20555-41001 March 21, 2012 Vice President. Operations Entergy Operations, Inc.

Grand Gulf Nuclear Station P.O. Box 756 Port Gibson, MS 39150

SUBJECT:

GRAND GULF NUCLEAR STATION. UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION FOR THE STEAM DRYER EVALUATION RE: EXTENDED POWER UPRATE LICENSE AMENDMENT REQUEST (TAC NO. ME4679)

Dear Sir or Madam:

By application dated September 8.2010 (Reference 1), as supplemented by letters dated November 18, 2010 (Reference 2), November 23,2010 (Reference 3). February 23. 2011 (four letters, References 4, 5, 6, and 7), March 9, 2011 (two letters, References 8) and 9, March 22, 2011 (Reference 10), March 30, 2011 (Reference 11), March 31, 2011 (Reference 12), April 14.

2011 (Reference 13), April 21. 2011 (Reference 14), May 3. 2011 (Reference 15), May 5, 2011 (Reference 16). May 11. 2011 (Reference 17). June 8, 2011 (Reference 18), June 15, 2011 (Reference 19), June 21, 2011 (Reference 20) June 23, 2011 (Reference 21). July 6. 2011 (Reference 22), July 28, 2011 (Reference 23), August 25, 2011 (Reference 24), August 29, 2011 (Reference 25), August 30, 2011 (Reference 26), September 2, 2011 (Reference 27),

September 9, 2011 (Reference 28). September 12, 2011 (Reference 29), September 15, 2011 (Reference 30), September 26,2011 (Reference 31). October 10, 2011 (two letters.

References 32 and 33), October 24, 2011 (Reference 34), November 14, 2011 (Reference 35),

November 25.2011 (Reference 36), November 28,2011 (Reference 37), December 19. 2011 (Reference 38), February 6, 2012 (Reference 39), February 15, 2012 (Reference 40),

February 20,2012 (Reference 41), and March 13, 2012 (Reference 42), Entergy Operations, Inc. (Entergy. the licensee). submitted a license amendment request for Grand Gulf Nuclear Station, Unit 1 (GGNS). Portions of the letters dated September 8 and November 23. 2010, and February 23. April 21, May 11, July 6, July 28, September 2, October 10, November 14, November 25. and November 28.2011. and February 6. February 15, February 20, and March 13, 2012, contain sensitive unclassified non-safeguards information (proprietary) and, accordingly, have been withheld from public disclosure. The proposed amendment requests an increase in the maximum steady.state power level at GGNS from 3898 megawatts thermal (MWt) to 4408 MWt. This represents an approximate 13 percent increase above the current licensed thermal power or an approximate 15 percent increase above the original licensed thermal power.

The U.S. Nuclear Regulatory Commission (NRC) staff has determined that the following additional information is needed for the NRC staff to complete our review of this amendment.

NOTICE: Enclosure 1 to this letter contains Proprietary Information. Upon separation from Enclosure 1. this letter is DECONTROLLED.

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The enclosed request for additional infoonation (RAI) pertaining to the steam dryer evaluation was discussed with Mr, Jerry Burford of your staff on February 12,2012, and it was agreed that a response to RAls 1,4,7,8, and 9 would be provided by February 12, 2012, and a response to RAls 2 and 6 would be provided by February 19. 2012. The NRC staff's proprietary version of the RAils provided 1n Enclosure 1 and a nonproprietary version is provided in Enclosure 2. A list of references is provided in Enclosure 3. The proprietary information in Enclosure 1 is identified by text enclosed within double brackets.

If circumstances result in the need to revise the requested response date, please contact me at (301) 415*1445 or via e-mail at AI@n.Wang@nrc.gov.

Sincerely.

~W~

Alan B. Wang, Project Manager Plant Ucenslng Branch IV Division of Operating Reactor Ucensing Office of Nuclear Reactor Regulation Docket No. 50-416

Enclosure:

1. Request for Additional Information (proprietary)

2. Request for Additional Information (non-proprietary)

3. Ust of References cc wlEncl 2 and 3: Distribution via Ustserv

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REQUEST FOR ADDITIONAL INFORMATION STEAM DRYER EVALUATION GRAND GULF NUCLEAR STATION. UNIT NO.1 EXTENDED POWER UPRATE LICENSE AMENDMEJjT REQUEST ENTERGY OPERATIONS. INC.

DOCKET NO. 50-416

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OFFIG.AL USE ONLY PROPRIETARY INFORMA'FION BEQUEST FOB ADDITIONAL INFORMATION STEAM DRYER EVALUATION GRAND GULF NUCLEAR STATION, UNIT NO.1 EXTENDED POWER UPRATE LICENSE AMENDMENT REQUEST ENTERGY OPERATIONS. INC.

DOCKET NO. 50-416 By letter dated September 8,2010, as supplemented (see Enclosure 3), Entergy Operations.

tnc. (Entergy). submitted an extended power uprate (EPU) license amendment request (LAR) for the Grand Gulf Nuclear Station, Unit No. 1 (GGNS). The proposed amendment requests an increase in the maximum steady-state power /evel at GGNS from 3898 megawatts thermal (MWt) to 4408 MWt. This represents an approximate 13 percent Increase above the current licensed thermal power (CLTP) or an approximate 15 percent increase above the original licensed thermal power.

The U.S. Nuclear Regulatory Commission (NRC) staff's review ofthe LAR has identified areas regarding the steam dryer for which additlona/lnformation is required for the NRC staff to complete Its review. Please note that the staff has determined that portions of this request for additional information (RAI) contain sensitive unclassified non-safeguards information (proprietary) and. accordingly, those portions of the RAI identified by text enclosed within double brackets have been withheld from public disclosure.

EMCB-GGNS1-SD w6*RAI-01 [Follow-up to RAI-04 from previous Round #51]

Solid-aheU Transition 1 Wang. A. 8., U.S. Nuclear Regulatory Commission, letter to Entergy Operations, Inc., "Grand Gulf Nuclear Station, Unit 1 - Request for Additional Information for the Steam Dryer Evaluation Re:

Extended Power Uprate License Amendment Request (lAC No. ME4679): dated February 14. 2012 (Round 5 RAI) (ADAMS Accession No. ML120400216).

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-2 conclusion is not acceptable to the NRC staff because, as stated In the response to RAI 6(a),

the submodeling approach may not necessarily always provide a stress ratio less than 1.0 when the effects of the local features are included. The licensee is requested to provide the following:

1. Please provide the difference between the MPC option provided in ANSYS and the use of constraint equations In modeling the shell-solid interface.

2. Please e~lain how the accuracy of the stresses calculated using the MPC option is determined.

3. Please provide the accuracy of the stresses calculated using the overlay option.

4. Please provide the minimum alternating stress ratio, based on the maximum stress intensity calculated using the MPC option.

5. Please explain why the submodeling approach provides conservative results at the outer hood location, as discussed in the response.

6. Please confirm that the use of submOdeling shows that the stresses at all the shell-ta-solid interfaces calculated using the overlay and MPC option are conservative.

7. Please confirm that the results In Table 1 account for the effects of any unconnected nodes.

EMCB-GGNS1-80-6-RAr-02 (Follow-up to RAI..oS from previous Round #5)

Unconnected Nodes (a) The licensee stated that there are GGNS replacement steam dryer reanalyzed the global model using the flow induced \Jihl~..ti,.."

(i) Please provide the minimum alternatin9 stree. ratio based on the reanalysis results.

(Ii) Please provide the maximum non-eonservatlve error Introduced by the disconnected nodes. Please discuss how this error may be affected by the FIV loads resulting from the consideration of the (+1- 10%) frequency shifts.

(iii) Please explain why all ~ were not corrected before performing the reanalYS~in if the finite element model mesh Is automatically generated using mesh generators or manually generated.

(b) In response to Part (c) of the response to RAI-08. Round #5. the licensee stated that the mesh convergence study was performed in a low frequency range for the

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Susquehanna Steam Electric Station (SSES) finite element model (FEM) to determine the adequacy of the mesh. Please explain whether a similar study was performed in a high frequency range.

Entergy Is requested to update the stress margin tables using the individual bias errors In Table 1 in the RAI response. The licensee may *not* average the errors and add that value to the stresses - as the errors will naturally average to O.

EMCB-GGNS1-SD-6-RAI-03 (Follow-up to RAI*12 from previous Round '5)

Root Cause Analysis of Susquehanna Cracking (Deleted)

EMCB-GGNS1-SD-6-RAI-04 MSL Strain Gage Strain ConversIon and Measurement Bias The licensee is requested to quantify the following terms In equation (4-1) of Appendix-A (Attachment 11B to Reference 1) of NEDC-33601 P, Revision O. GGNS evaluations utilize the plant based load evaluation (PBlE) method 2 (main steam line (MSl) strain gage data) bias errors and uncertainties based on Quad Cities Unit 2 (QC2) benchmark, and FE bias errors and uncertainties based on SSES1 benchmark {PBlE method 1 (on-dryer instruments) & end-to-end based on on-dryer strain gages].

(1) Please quantify the magnitude of the strain gage bias term Bilk in equation (4-1) noted above. .

(2) additional clarifications. _

EMCB-GGNS1-SD-6-RAI-05 (Delated)

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-4 EMCB-GGNS1-80-6*RAI-06 Updated OGNS St.am Ory,r SIllS! Tables The licensee recalculated the stresses for some of the dryer components for GGNS as indicated In the responses to RAI*03, RAI-04, RAI-06, and RAI-12 ofthe Round #5 RAls.

(a) Please provide an updated summary ofthe maximum fatigue stress and maximum alternating stress ratio (MASR) values (Tables 4-1,4-2, and 4-3 of Attachment 11B) for the various steam dryer components at CLTP and EPU conditions (similar to Table 2 in response to audit action item #11. page 36 of 46 of Attachment 1 to GNRQ-2011/00088 (Reference 33>>.

(b) Please update the dryer stresses (Table 4-4 of Attachment 11B) for the American Society of Mechanical Engineers (ASME) Normal. Upset. Emergency, and Faulted combinations to address the recently found errors (e.g.* disconnected nodes, partial penetration welds, use of overlay) in the FEM of GGNS RSD.

(c) Please provide the updated limit curves, if necessary.

safety relief valve (SRV) tones, if any appear measurements because two emerging tones present at ClTP would have been included in EMCB-GGNS1-80-8-RAI-07 (Follow-up to RAI-01 of Round #5)

B.-benchmarking of PBLE The licensee's response Is not sufficient for the NRC staff to confirm the conservatism of the GGNS dryer stress margins. However, the commitment to Instrument the GGNS dryer allows the staff to set a critical license condition (see below) where a re-benchmarking and subsequent reassessment of GGNS dryer EPU stress projections must be evaluated and approved by the staff.

One of the Proposed LIcense Conditlona

i. The licensee shall submit the updated PBlE and end-to-end benchmarking of the GGNS dryer strains and stresses at ClTP conditions, along with updated stress projections at EPU conditions to the staff for evaluation and approval prior to power ascenSion above CLTP.

ii. The licensee shall submit the updated PBLE and end-to-end benchmarking of the GGNS dryer strains and stresses at 103.5% of CLTP, 107% of CLTP, and 1100~ of CLTP power levels, along with updated stress projections at EPU conditions to the staff for evaluation and approval after 15 days of reaching those respective power levels.

iii. The results of the power ascension testing to verify the continued structural integrity of the steam dryer and the final steam dryer load definition and steam OFF.GlAl WSE ONlY PROPRIETARY INFORMATION

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-5 dryer stress report shall be submitted to the NRC staff in a report within 60 days following the completion of all 113% CLTP (EPU) power ascension testing.

The NRC staff must also have reasonable assurance that the GGNS replacement steam dryer will successfully withstand the loads at EPU conditions; therefore, the licensee is requested to provide the following additional information:

In order to resolve the concems regarding the overty coarse (not meeting 6 elements I wavelength) QC2 acoustic mesh issue, please provide narrow-band power spectral density (PSD) comparisons of the nominal and refined QC2 acoustic model simUlations compared to those measured on the QC2 dryer. Also, please provide a table of narrow-band bias errors and uncertainties computed using the nominal and refined QC2 acoustic models. Address any non conservative narrow-band results (the refined mesh producing lower loads than the coarse mesh, indicating non-conservative bias errors for the nominal meSh).

EMCB-GGNS1-SD-6-RAI-Ga (Follow-up to RAI-G2 of Round #5)

Strain Gage Bias Errors EMCB-GGNS1*SD-6*RAI"()9 (Follow-up to RAI'()9 of Round #5)

Dryer Instrumentation, Benchmark of Blaa and Uncertainty using GGNS.speclfic MSL and On-Drver InstrumentatIon. and Power AscensIon Based on the review of the response to RAI-()9 (Attachment 1 to GNR0-2012/00009). the NRC staff requests the following information:

i) The table on page 49 of 66 of GNRO-2012/00009 (Reference 40) for the response to RAI-09 in Round #5 shows that each accelerometer is associated with severa' high stress locations. Please explain how the accelerometer measurements will be used in estimating the stresses at these locations.

iQ Please explain how the accelerometer data will be used In determining the end*

to-end bias and uncertainty at the high stress locations on the outer hood.

iii) or be submitted for the NRC staff review.

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-6 iv) On page 53 of 66 (GNR0-2012100009) for the response to RAI-09 in Round #5, the use of F-factor and RMS methodology in prediction of peak stress and its location is summarized. It appears that the F-factor and RMS methodology would be able to identify the changes in the peak stress location as power Is increased. Please explain whether this specific use of F-factor and RMS methodology has been validated. In addition, please confirm:

a. Whether this detennlnation of the peak stress and Its location would be made at each hold period. Please identify the hold periods.

b. The results with sufficient details will be submitted to the NRC staff for its review and approval.

v) In order to expedite the review process and not to lose the functionality of the on dryer instruments, the NRC staff needs the following Information. Please provide a detailed report outline including section titles, tables, plots and figures. Please identify all the data that will be submitted to the staff at power levels reaching to ClTP, ClTP, and each hold period above CLTP, so that the staff can make a decision about further power increase. As a minimum, the staff would like to review the following data:

a. Benchmarking of PBlE Methods 1 and 2

b. End-to-end benchmarking

c. Maximum stress and its location

d. Comparison with acceptance criteria

e. Projection to next hold period and to EPU

f. Any projected violation of acceptance criteria

g. Any revisions to limit curves vi) Perfonn reanalysis of the GGNS RSD using the measured pressure loads at C results with the ones obtalned_

Please note that the NRC staff's review of the MSl and on-dryer Instrumentation data and evaluations to be submitted by the licensee at ClTP condition may require longer than 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br /> due to complete reassessment of the first time use of PBlE methodology and end-ta-end benchmark. The subsequent staff assessments of power ascension dats at power plateaus above ClTP, however, will be subject to the ususl96-hour evaluation periods.

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OFFICIAL USE ONLY PROPRIETARY INFORMATION ENCLOSURE 3- REFERENCES

1. Krupa, M. A" Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "License Amendment Request, Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated September 8,2010 (GNRO-2010/00056) (ADAMS Accession No. ML102660409).

2. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission,

• Supplemental License Amendment Request, Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1," dated November 18, 2010 (GNRO-2010100071) (ADAMS Accession No. ML103260003).

3. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission,

• Supplemental License Amendment Request, Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated November 23,2010 (GNR0-2010100073) (ADAMS Accession No. ML103330146).

4. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission,

• Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1," dated February 23, 2011 (GNRO-2011/00007) (ADAMS Accession No. ML110540534).

5. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1, dated February 23, 2011 (GNRO-2011/00012) (ADAMS W

Accession No. ML110540540).

6. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated February 23, 2011 (GN R0-2011 100011) (ADAMS AcceSSion No. ML110540545).

7. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,- dated February 23. 2011 (GNRO-2011100013) (ADAMS AcceSsion No. ML110550318).

8. Krupa, M. A., Entergy Operations, Inc.* letter to U.S. Nuclear Regulatory Commission, "Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1: dated March 9, 2011 (GNR0-2011/00017) (ADAMS Accession No. ML110680507).

9. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory CommiSSion, "Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1," dated March 9,2011 (GNRQ.2011/00016) (ADAMS Accession No. ML110730025).

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10. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission.

"Request for Additional Information Regarding Extended Power Uprate. Grand Gulf Nuclear Station, Unit 1," dated March 22. 2011 (GN R0-20 11/00019) (ADAM S Accession No. ML110820262).

11. Krupa, M. A., Entergy Operations, Inc., letter to U.S. NUclear Regulatory Commission, "Request for Additionallnfonnatlon Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1," dated March 30. 2011 (GNR0-2011/0oo18) (ADAMS Accession No. ML110900275).

12. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additionallnfonnation Regarding Extended Power Uprate. Grand Gulf Nuclear Station, Unit 1,* dated March 31, 2011 (GNRO-2011 100021) (ADAMS Accession No. ML110900586).

13. Krupa, M. A" Entergy Operations. Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additionallnfonnation Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated April 14, 2011 (GNRO-20111OOO24) (ADAMS Accession No. ML111050134).

14. Krupa, M. A.. Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station. Unit 1," dated April 21. 2011 (GNRO-2011/00025) (ADAMS Accession No. ML111120329).

15. Krupa, M. A.. Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission.

"Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station. Unit 1,* dated May 3, 2011 (GNRO-20111OO034) (ADAMS Accession No. ML111240288).

16. Krupa. M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additionallnfonnation Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated May 5, 2011 (GNRO-2011/00035) (ADAMS Accession No. ML111250552).

17. Krupa. M. A.. Entergy Operations. Inc.* letter to U.S. Nuclear Regulatory Commission.

"Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station. Unit 1,* dated May 11. 2011 (GNRO-2011/00037) (ADAMS Accession No. ML111320263).

18. Krupa, M. A.* Entergy Operations, Inc.* letter to U.S. Nuclear Regulatory Commission.

"Request for Additional Information Regarding Extended Power Uprate. Grand Gulf Nuclear Station. Unit 1," dated June 8. 2011 (GNRO-2011/00043) (ADAMS Accession No. ML111590636).

19. Krupa, M. A., Entergy Operations. Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1, dated June 15, 2011 (GNR0-2011100046) (ADAMS Accession U

No. ML111670059).

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20. Krupa, M. A, Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additional Infonnation Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated June 21,2011 (GNRO-2011100050) (ADAMS Accession No. ML111730235).

21. Krupa, M. A, Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, URequest for Additlonallnfonnation Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated June 23, 2011 (GNR0-2011/00052) (ADAMS Accession No. ML111750244).

22. Krupa, M. A, Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additionallnfonnation Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated July 6, 2011 (GNR0-2011/00053) (ADAMS Accession No. ML111880138).

23. Krupa, M. A, Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, DRequest for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,' dated July 28,2011 (GNR0-2011/00055) (ADAMS Accession No. ML112101485).

24. Krupa, M. A, Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additional Infonnation Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,' dated August 25, 2011 (GNRO-2011/00070) (ADAMS Accession No. ML112370770).

25. Krupa, M. A, Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additionallnfonnation Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated August 29, 2011 (GNRO-2011/00073) (ADAMS Accession No. ML112410566).

26. Krupa, M. A, Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission,

• Supplemental Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1," dated August 30,2011 (GNR0-2011100074) (ADAMS Accession No. ML112420169).

27. Krupa. M. A, Entergy Operations. Inc.* letter to U.S. Nuclear Regulatory Commission.

"Supplemental Information Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,'

dated September 2,2011 (GNRO-2011100075) (ADAMS Accession No. ML112490050).

28. Krupa, M. A, Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission.

"Supplemental Information Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1; dated September 9, 2011 (GNRO-2011/00033) (ADAMS Accession No. Ml112521284).

29. Krupa. M. A. Entergy Operations, Inc.* letter to U.S. Nuclear Regulatory Commission.

"Request for Additionallnfonnation Extended Power Uprate, Grand Gulf Nuclear Station.

Unit 1," dated September 12, 2011 (GNRO-2011/00079) (ADAMS Accession No. ML112550495).

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30. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Response to Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated September 15. 2011 (GNR0-2011/00080)

(ADAMS Accession No. ML112580223).

31. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, uResponse to Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated September 26, 2011 (GNRO-2011/00082)

(ADAMS Accession No. ML112690143).

32. Krupa, M. A., Entergy Operations, Inc., letter to U:S. Nuclear Regulatory Commission, "Request for Additionallnfonnation Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1," dated October 10, 2011 (GNRO-2011/00087) (ADAMS Accession No. ML112840155).

33. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatqry Commission, "Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,u dated October 10,2011 (GNRO-2011/00088) (ADAMS Accession No. ML112840171).

34. Krupa. M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Supplemental Information Pertaining to Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1: dated October 24, 2011 (GNRO-2011/00092) (ADAMS Accession No. ML112980113).

35. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additional Information Regarding Extended Power Uprate. Grand Gulf Nuclear Station, Unit 1," dated November 14, 2011 (GNRO-2011100101) (ADAMS Accession No. ML113190403).

36. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,- dated November 25, 2011 (GNRQ-2011/001 05) (ADAMS Accession No. ML113290137).

37. Krupa. M. A., Entergy Operations. Inc.. letter to U.S. Nuclear Regulatory Commission.

"Request for Additional Infonnation Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1: dated November 28, 2011 (GNRO-2011/00107) (ADAMS Accession No. ML113320403).

38 . Krupa. M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additlonallnfonnation Regarding Extended Power Uprate. Grand Gulf Nuclear Station, Unit 1: dated December 19, 2011 (GNRO-2011/00111) (ADAMS Accession No. ML113530656).

39. Krupa. M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additionallnfonnation Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,- dated February 6,2012 (GNRO-2012100006) (ADAMS Accession No. ML12039A071).

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40. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission.

"Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1: dated February 15, 2012 (GNRO*2012/00009) (ADAMS Accession No. ML120470138).

41. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1,* dated February 20, 2012 (GNRO*2012100011) (ADAMS Accession No. ML12054A038).

42. Krupa, M. A., Entergy Operations, Inc., letter to U.S. Nuclear Regulatory Commission, "Response to Request for Additional Information Regarding Extended Power Uprate, Grand Gulf Nuclear Station, Unit 1," dated March 13,2012 (GNR0-2012100016)

(ADAMS Accession No. ML120740083).

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-2 The enclosed request for additional information (RAI) pertaining to the steam dryer evaluation was discussed with Mr. Jerry Burford of your staff on February 12. 2012, and it was agreed that a response to RAls 1, 4. 7. B. and 9 would be provided by February 12, 2012, and a response to RAls 2 and 6 would be provided by February 19.2012. The NRC staff's proprietary version of the RAI is provided in Enclosure 1 and a nonproprietary version is provided in Enclosure 2. A list of references is provided in Enclosure 3. The proprietary information in Enclosure 1 is identified by text enclosed within double brackets.

If circumstances result in the need to revise the requested response date, please contact me at (301) 415-1445 or via e-mail at Alan.Wang@nrc.gov.

Sincerely, IRAJ Alan B. Wang, Project Manager Plant licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-416

Enclosure:

1. Request for Additional Information (proprietary)

2. Request for Additional Information (non..proprletary)

3. List of References cc wlEnel 2 and 3: Distribution via Listserv DISTRIBUTION:

NON-PUBLIC LPLlVrlf RldsAcrsAcnw MailCTR Resource RidsNrrOeErncb Resource RidsNnDorlLp14 Resource RidsNrrLAJBurnhardt Resource RidsNrrPMGrandGulf Resource RidsRgn4MailCenter Resource CBasavaraju. NRRlDEIEMCB ADAMS Accession Nos.: Pkg ML120720312; Proprietary RAI ML120720320; Non*Proprietatry RAI ML120720331 *RAI mem01 dated OFFICE NRRJDORLlLPL4IPM NRRJDORLAPLAILA NRRIDEIEMC9IBC NRRJDORULPlWC NRRIDORLlLPL.wM NAME AWang JBudthardt MMurphy" MMaridey AWang 318112 3121/12 3121/12

!OATE 3119112 3118112 OFFICIAL AGENCY RECORD

~vJ OFFIGIAll:JSE ONLY

• PROPRIETARY INFORMATION