Letter Sequence RAI |
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TAC:ME9631, BWR Technical Specification Changes That Implement the Revised Rule for Combustible Gas Control (Approved, Closed) |
Initiation
- Request, Request, Request, Request, Request, Request, Request, Request, Request
- Acceptance
- Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement, Supplement
Administration
- Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance
- Meeting, Meeting
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MONTHYEARML12286A0122012-09-28028 September 2012 License Amendment Request - Extended Power Uprate Project stage: Request ML12286A0112012-09-30030 September 2012 License Amendment Request - Extended Power Uprate, Attachment 4, NEDO-33566, Rev. 0, Safety Analysis Report, Constant Pressure Power Uprate, Page 2-488 Through End, and Attachments 5 and 7 Through 9 Project stage: Request ML12279A2852012-10-22022 October 2012 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML12279A2902012-10-22022 October 2012 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit 2 Nos. 2 and 3 Project stage: Withholding Request Acceptance ML13042A0962013-02-0808 February 2013 Completed Evaluation of Part 21 Potentially Reportable Condition Notification: Error in Main Steam Line High Flow Calculational Methodology Project stage: Request ML13051A0322013-02-15015 February 2013 Supplemental Information & Corrections Supporting Request for License Amendment Request - Extended Power Uprate - Supplement No. 1 Project stage: Supplement ML13056A4822013-03-0808 March 2013 Acceptance Review Regarding Proposed Extended Power Uprate Project stage: Acceptance Review ML13052A8532013-03-11011 March 2013 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML13052A8562013-03-11011 March 2013 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML13081A7052013-03-28028 March 2013 Request for Additional Information Regarding License Amendment Request for Extended Power Uprate Project stage: RAI ML13106A1262013-04-26026 April 2013 Request for Additional Information Regarding License Amendment Request for Extended Power Uprate Project stage: RAI ML13129A1432013-05-0707 May 2013 Extended Power Uprate, Supplement 2 - Response to Request for Additional Information Project stage: Supplement ML13149A1452013-05-24024 May 2013 Extended Power Uprate License Amendment Request - Supplement 3 Response to Request for Additional Information - Extended Power Uprate Project stage: Supplement ML13156A3682013-06-0404 June 2013 Extended Power Uprate License Amendment Request Supplement 4 Response to Request for Additional Information - Extended Power Uprate Project stage: Supplement ML13134A3842013-06-10010 June 2013 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML13161A3972013-06-26026 June 2013 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML13182A0252013-06-27027 June 2013 Supplemental Information Supporting Request for License Amendment Request - Extended Power Uprate - Supplement No. 5 Project stage: Supplement ML13178A3312013-07-0101 July 2013 Request for Additional Information Regarding License Amendment Request for Extended Power Uprate Project stage: RAI ML13183A1992013-07-0303 July 2013 Request for Additional Information Regarding License Amendment Request for Extended Power Uprate Project stage: RAI ML13203A1142013-07-23023 July 2013 Non-Proprietary - Request for Additional Information Regarding Proposed License Amendment Extended Power Uprate Project stage: RAI ML13203A1002013-07-23023 July 2013 Request for Additional Information Regarding License Amendment Request for Extended Uprate Project stage: RAI ML13211A4032013-07-30030 July 2013 EPU LAR Supplement 6 Attachment 2 - Response to Request for Additional Information - Snpb Project stage: Supplement ML13211A4022013-07-30030 July 2013 Extended Power Uprate License Amendment Request - Supplement 6 Response to Request for Additional Information - Extended Power Uprate Project stage: Supplement ML13213A2852013-07-31031 July 2013 Extended Power Uprate License Amendment Request - Supplement 7, Response to Request for Additional Information - Extended Power Uprate Project stage: Supplement ML13217A4312013-08-0505 August 2013 Extended Power Uprate License Amendment Request - Supplement 8 Response to Request for Additional Information - Extended Power Uprate Project stage: Supplement ML13221A0642013-08-15015 August 2013 Request for Additional Information Regarding License Amendment Request for Extended Power Uprate Project stage: RAI ML13240A0022013-08-22022 August 2013 Extended Power Uprate License Amendment Request - Supplement 9 Response to Request for Additional Information Project stage: Supplement ML13232A2772013-08-26026 August 2013 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML13232A2902013-08-26026 August 2013 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML13241A4182013-08-29029 August 2013 Extended Power Uprate License Amendment Request - Supplement 10 Response to Request for Additional Information Project stage: Supplement ML13253A4162013-09-11011 September 2013 Request for Additional Information Regarding License Amendment Request for Extended Power Uprate Project stage: RAI ML13260A0762013-09-13013 September 2013 Extended Power Uprate License Amendment Request - Supplement 11 Response to Request for Additional Information Project stage: Supplement ML13247A7692013-09-18018 September 2013 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML13261A0432013-09-18018 September 2013 Requesty for Additional Information Regarding License Amendment Request for Extended Power Uprate Project stage: Other ML13242A0902013-10-0101 October 2013 Draft Environmental Assessment and Finding of No Significant Impact Related to the Proposed Extended Power Uprate Project stage: Draft Other ML13242A1082013-10-0101 October 2013 Draft Environmental Assessment and Finding of No Significant Impact Related to the Proposed Extended Power Uprate Project stage: Draft Other ML13268A4002013-10-0101 October 2013 Enclosure 2 - Peach Bottom Atomic Power Station, Units 2 and 3 - Request for Additional Information Regarding License Amendment Request for Extended Power Uprate Project stage: RAI ML13268A2632013-10-0101 October 2013 Request for Additional Information Regarding License Amendment Request for Extended Power Uprate Project stage: RAI ML13289A1912013-10-11011 October 2013 Extended Power Uprate License Amendment Request - Supplement 12, Response to Request for Additional Information Project stage: Supplement ML13289A3002013-10-15015 October 2013 Extended Power Uprate License Amendment Request - Supplement 13 Response to Request for Additional Information Project stage: Supplement ML13308A3312013-10-31031 October 2013 Extended Power Uprate License Amendment Request - Supplement 14, Response to Request for Additional Information Project stage: Supplement ML13291A1222013-11-0606 November 2013 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML13339A8072013-11-22022 November 2013 Comment (1) of Kevin Borton on Behalf of Exelon Generation Co. LLC, on Proposed License Amendment to Increase the Maximum Reactor Power Level Project stage: Other ML13338A2502013-12-0404 December 2013 Notice of Forthcoming Closed Meeting with Exelon Generation Company, LLC (Exelon) to Discuss Steam Dryer Analysis Related to Proposed Extended Power Uprate (EPU) for Peach Bottom Atomic Power Station (Pbaps), Units 2 and 3 Project stage: Request ML13345A6872013-12-0606 December 2013 Supplement 15 Response to Request for Additional Information Extended Power Uprate License Amendment Request Project stage: Supplement ML13308C4412013-12-11011 December 2013 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML13351A3902013-12-19019 December 2013 Summary of Closed Meeting with Exelon Generation Company, LLC, to Discuss Steam Dryer Analysis Related to Proposed Extended Power Uprate for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Meeting ML13358A0832013-12-20020 December 2013 Extended Power Uprate License Amendment Request- Supplement 16 Corrections, Clarifications and Additional Information - Extended Power Uprate Project stage: Supplement ML13345B3102014-01-0808 January 2014 Request for Withholding Information from Public Disclosure for Peach Bottom Atomic Power Station, Unit Nos. 2 and 3 Project stage: Withholding Request Acceptance ML14002A1762014-01-15015 January 2014 Request for Additional Information Regarding License Amendment Request for Extended Power Uprate Project stage: RAI 2013-05-24
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Category:Request for Additional Information (RAI)
MONTHYEARIR 05000277/20244012023-10-0505 October 2023 Information Request for the Cybersecurity Baseline Inspection, Notification to Perform Inspection 05000277/2024401 and 05000278/2024401 ML23264A7992023-09-21021 September 2023 NRR E-mail Capture - Final RAI - Constellation Energy Generation, LLC Fleet Request License Amendment Request to Adopt TSTF-580, Revision 1 ML22118A3312022-04-28028 April 2022 NRR E-mail Capture - Peach Bottom - Formal RAI for Proposed Alternative I5R-14, Revision 1 ML22041B5362022-02-10010 February 2022 NRR E-mail Capture - Constellation Energy Generation, LLC - Request for Additional Information Regarding Fleet License Amendment Request to Adopt TSTF-541 ML22021A5692022-01-21021 January 2022 Information Request for the Cyber Security Baseline Inspection, Notification to Perform Inspection 05000277/2022403 and 05000278/2022403 ML22020A0642022-01-13013 January 2022 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding Proposed Fleet Alternative for Repair of Water Level Instrumentation Partial Penetration Nozzles ML21256A1902021-09-10010 September 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application ML21144A2132021-05-24024 May 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application ML21062A0652021-03-0101 March 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding Proposed Fleet Alternative to Documentation Requirements for Pressure Retaining Bolting ML21049A2572021-02-18018 February 2021 Request for Additional Information Byron/Dresden Proposed Changes to Site Emergency Plans to Support Post-Shutdown and Permanently Defueled Conditions (EPID-2020-LLA-0240 & EPID-2020-LLA-0237) ML21035A2222021-02-0404 February 2021 Notification of Conduct of a Fire Protection Team Inspection ML21091A1782021-02-0202 February 2021 Ti 2515/194 Inspection Documentation Request ML21012A1302021-01-12012 January 2021 Request for Additional Information - TSTF-505 ML20357A0972020-12-21021 December 2020 Request for Additional Information - TSTF-505 ML20296A3342020-10-21021 October 2020 ISI Remote Inspection - Supplemental Request for Information ML20239A7982020-08-25025 August 2020 NRR E-mail Capture - Exelon Generation Company, LLC - Fleet License Amendment Request to Adopt TSTF-568, Revision 2 ML20153A7042020-06-0101 June 2020 NRR E-mail Capture - Preliminary RAI for Fleet Request to Use Alternative OMN-26 ML20135H1972020-05-14014 May 2020 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding Request to Extend Safety Relief Valve Test Interval ML20070R2282020-03-10010 March 2020 Request for Additional Information - RR ML19303D1662019-10-31031 October 2019 Requests for Additional Information for the Environmental Review of the Peach Bottom Subsequent License Renewal Application - Set 2 (EPID No. L-2018-RNW-0013)- RAIs ML19232A1752019-08-20020 August 2019 Request for Additional Information - TSTF-500 Implementation LAR ML19140A2832019-05-15015 May 2019 Email - Peach Bottom Atomic Power Station, Units 2 and 3 Second Round RAI Request - Set 1 ML19140A2822019-05-15015 May 2019 027 Pb FU RAI Subsequent to Clarification Call - Cu Greater than 15 Zn Holston (Jg) ML19253D2932019-05-0707 May 2019 002 Attachment 4D Confirmation Water Chemistry Chereskin Revised (002) ML19249C7252019-05-0303 May 2019 SLRA Requests for Additional Information - Set 2 May 3, 2019 ML19108A4282019-04-10010 April 2019 RAIs SLRA Set 1_ERO(Rev 1) ML19079A0232019-03-19019 March 2019 Licensed Operator Positive Fitness-For-Duty Test ML19058A2902019-02-27027 February 2019 Request for Additional Information - High Pressure Service Water One Time TS Change ML19037A4832019-02-0606 February 2019 NRR E-mail Capture - Clarification Questions Associated with Staff Assessment of Peach Bottom Seismic Probabilistic Risk Assessment Report Dated August 28, 2018 ML19028A0062019-01-25025 January 2019 Secondary Containment LAR Requests for Additional Information ML19017A0472019-01-16016 January 2019 Request for Additional Information - High Pressure Service Water One Time TS Change ML18348B0292018-12-13013 December 2018 Subsequent License Renewal Severe Accident Mitigation Alternatives Requests for Additional Information ML19010A3832018-12-0707 December 2018 Additional Documents Needed for Peach Bottom SLR Environmental Review ML18324A6742018-11-15015 November 2018 Request for Additional Information (FINAL)- LAR to Allow 2SRV/SVs OOS at High Pressure ML18312A4072018-11-0808 November 2018 Request for Additional Information (Public) - LAR to Allow 2SRV/SVs OOS at High Pressure ML18276A0202018-10-0202 October 2018 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Amendment Request to Revise Emergency Plan for Limerick and Peach Bottom ML18240A1742018-08-28028 August 2018 Request for Additional Information (Final) - Adopt TSTF-500 Battery TS Changes LAR ML18239A1322018-08-27027 August 2018 Request for Additional Information Final - Relief Request I5R-04 ML18228A6762018-08-14014 August 2018 Request for Additional Information - Adopt TSTF-500 Battery TS Changes LAR ML18226A2012018-08-14014 August 2018 Request for Additional Information - Relief Request I5R-05 ML18214A2812018-08-0202 August 2018 Request for Additional Information Draft - Relief Request I5R-02 ML18200A2742018-07-17017 July 2018 Request for Additional Information 2nd Round (Final) - Adopt 50.69 License Amendment ML18192A1192018-07-10010 July 2018 Request for Additional Information 2nd Round (Final) - Adopt 50.69 License Amendment ML18178A4772018-06-27027 June 2018 Request for Additional Information 2nd Round - Adopt 50.69 License Amendment ML18096B5062018-04-0606 April 2018 Request for Additional Information Exelon Generation Company, LLC Requested Amendment to Adopt 10 CFR 50.69 for Risk-informed Categorization and Treatment of Structures, Systems and Components ML18094B0832018-04-0505 April 2018 Enclosurequest for Additional Information (Letter to P. Duke RAI Regarding Entergy Operations, Inc.'S Decommissioning Funding Plan Update for Salem and Hope Creek, and Peach Bottom ISFSIs Docket Nos. 72-48 and 72-29) ML18067A1482018-03-0808 March 2018 Enclosurequest for Additional Information (Letter to P. R. Simpson Request for Additional Information Regarding Exelon Generating Company, Llc'S Decommissioning Funding Plan Update for Independent Spent Fuel Storage Installation) ML17317B5502017-11-0909 November 2017 Licensed Operator Positive Fitness-For-Duty Test ML17240A0062017-08-24024 August 2017 Request for Additional Information Regarding License Amendment Request for Measurement Uncertainty Recapture Power Uprate ML17222A0962017-08-10010 August 2017 Request for Additional Information - Amendment Request Regarding Safety Relief Valve and Safety Valce Operability for Cycle 22 2023-09-21
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OFFICIAL USE ONLY PROPRIETARY INFORMATION REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED LICENSE AMENDMENT EXTENDED POWER UPRATE EXELON GENERATION COMPANY, LLC PEACH BOTTOM ATOMIC POWER STATION, UNITS 2 AND 3 DOCKET NOS. 50-277 AND 50-278 Proprietary information pursuant to Title 10 of the Code of Federal Regulations (1 0 CFR) Section 2.390 has been redacted from this document.
Redacted information is identified by blank space enclosed within double brackets as shown here (( )).
Enclosure 2 OFFICIAL USE ONLY PROPRIETARY INFORMATION
OFFICIAL USE ONLY PROPRIETARY INFORMATION REQUEST FOR ADDITIONAL INFORMATION REGARDING PROPOSED LICENSE AMENDMENT EXTENDED POWER UPRATE EXELON GENERATION COMPANY, LLC PEACH BOTTOM ATOMIC POWER STATION, UNITS 2 AND 3 DOCKET NOS. 50-277 AND 50-278 By letter dated September 28, 2012, as supplemented by letters dated February 15, 2013, May 7, 2013, May 24, 2013, June 4, 2013, June 27, 2013, July 30, 2013, July 31, 2013, August 5, 2013, August 22, 2013, August 29, 2013, and September 13, 2013 (Agencywide Documents Access and Management System (ADAMS) Accession Nos. ML122860201, ML13051A032, ML13129A143, ML13149A145, ML13156A368, ML13182A025, ML13211A457, ML13213A285, ML13217A431, ML13240A002, ML13241A418, and ML13260A076, respectively), Exelon Generation Company, LLC (Exelon, the licensee) submitted a license amendment request for Peach Bottom Atomic Power Station (PBAPS), Units 2 and 3. The proposed amendment would authorize an increase in the maximum power level from 3514 megawatts thermal (MWt) to 3951 MWt. The requested change, referred to as an extended power uprate (EPU), represents an increase of approximately 12.4 percent above the current licensed thermal power level (CLTP). ~
The Nuclear Regulatory Commission (NRC) staff is reviewing your submittal and has determined that additional information is needed to complete its review. The specific request for additional information (RAI) is addressed below.
Mechanical and Civil Engineering Branch (EMCB)
Reviewer: Chakrapani Basavaraju EMCB-SD-RAI-1 Section 7.4 of WCAP-17609-P 1 , "Peach Bottom Units 2 and 3 Replacement Steam Dryer Structural Evaluation for High Cycle Acoustic Loads," describes the use of submodeling for
(( )) the PBAPS Unit 2 Replacement Steam Dryer (RSD). The NRC staff requests the following information in order to evaluate the stress analysis of the localized regions of high stress using the aforementioned submodeling technique:
1 WCAP-17609-P, which is a proprietary document, is included as Enclosure 178.2 to Attachment 17 of the licensee's application dated September 28, 2012. A publicly available version of this document is included as Enclosure 158.2 to Attachment 15 of the application.
OFFICIAL USE ONLY PROPRIETARY INFORMATION
OFFICIAb USE ONbY PROPRIETARY INFORMATION a) Describe how the size of the submodel was determined.
b) Describe how the boundary conditions and the loads acting on the submodel were determined.
c) For ([ )), please provide a comparison of stresses (maximum stress and maximum alternating stress intensity) obtained from the global and submodel analyses, as a function of mesh size. To ensure that the cut-boundary conditions are correctly-applied, analyze each submodel with the same mesh size and geometry used in the global model and compare the results with those from the global analysis.
d) Provide the justifications for any assumptions made regarding the submodel analyses.
EMCB-SD-RAI-2 Section 7.4 of WCAP-17609-P states the following:
((
))
The (( )) as presented in the excerpt above, is not clear. Please provide a more detailed explanation regarding the aforementioned (( )) and provide at least one example.
EMCB-SD-RAI-3 Section 3.2 of WCAP-17609-P indicates that the PBAPS RSDs are supported at four support points on the support lugs. The dryer is restrained ([ )) and is free to expand in the radial direction. Please provide the radial displacement of the dryer support points at EPU and confirm whether the radial gaps between the dryer and the support lugs are closed at EPU. If the radial gap is closed, please explain how such closure is taken into account in the dynamic analysis of the dryer.
EMCB-SD-RAI-4 During recent EPU reviews, the NRC staff has encountered an issue regarding significant bias errors in the main steam line (MSL) strain gage array overall voltage to pressure conversion factors, leading to underestimates of the internal MSL acoustic pressures. Based on this experience, please discuss the MSL strain gage array voltage to pressure conversion factors for PBAPS plant (static) pressurization conditions along with the voltage to pressure conversion factors currently being assumed. Account for any MSL strain gage conversion factor bias errors in the fluctuating dynamic pressure loading on the steam dryer.
If the determination of the MSL strain gage voltage to pressure conversion factor bias errors as requested is not feasible, the NRC staff requests the following information .. Since Exelon plans to apply end-to-end bias and uncertainty determined from PBAPS Unit 2 to the predictions for OFFICIAb USE ONbY PROPRIETARY INFORMATION
OFFICIAl USE ONlY PROPRIETARY INFORMATION Unit 3, the gage conversion factors for the installed MSL strain gages at both units need to be the same. Please explain how Exelon will demonstrate that the gage voltage to pressure conversion factors, for the installed MSL strain gages at both units, are the same.
EMCB-SD-RAI-5 Question deleted following audit on September 12, 2013. No response required.
EMCB-SD-RAI-6 In Section 3.1.2 of WCAP-17609-P, the use of the (( j,.
)) is discussed in the context of connecting shell and solid elements. In some EPU applications, the use of (( )) has produced conservative results (as compared with the corresponding submodel (developed using only solid elements) results), whereas in other applications it has produced non-conservative results. Please evaluate the use of (( )) at several high stress locations by comparing the results with the corresponding submodel results.
Also, provide a background on the (( )) and a detailed example of its use in the dynamic analysis of the PBAPS RSDs.
EMCB-SD-RAI-7 Based on the review of the information provided in the enclosures contained in Attachment 17 to
' the application dated September 28, 2012, the NRC staff was unable to locate the information regarding how the stresses at the RSD welds (i.e., full penetration, partial penetration, and fillet welds) are calculated. Please describe how these stresses are calculated. State how the calculated weld stresses for the PBAPS RSDs compare with the weld stresses calculated in accordance with the approach recommended in American Society of Mechanical Engineers (ASME) Subsection NG, "Core Support Structures," based on the use of nominal stresses.
EMCB-SD-RAI-8 For PBAPS Units 2 arid 3, please provide the following for the 10 lowest alternating stress ratio locations:
a) Frequency spectra for maximum alternating stresses; and b) Stress accumulation plots (root mean square (RMS) stress as a'function of increasing frequency).
Please explain whether any other information (e.g., magnitude of stress as a function of frequency) besides the frequency content of stress may be derived from the plots. Based on the plots, discuss the relative importance of the various forcing functions (e.g., valve resonances, broad-band acoustic pulsations) on the RSD alternating stresses.
EMCB-SD-RAI-9 Question deleted following audit on September 12, 2013. No response required.
OFFICIAl USE ONlY PROPRIETARY INFORMATION
OFFICIAL USE ONLY PROPRIETARY INFORMATION EMCB-SD-RAI-1 0 In the Executive Summary in WCAP-17611-P, it states that the ((
)) The resonances of both valves are excited by the first shear layer mode, which is known to be a strong excitation source; this is similar to the acoustic resonances and subsequent steam dryer degradation experienced at Quad Cities Nuclear Power Station Unit 2 (QC2). In addition, the Target Rock SRV is expected to start resonance before CLTP conditions, which is, again, similar to the QC2 valve resonance. The scale model tests (SMTs) do not seem to replicate the PBAPS Units 2 and 3 plant data at CLTP. Although in-plant MSL measurements were performed at several power levels up to CLTP, you do not discuss the evolution of the standpipe resonance behavior with the power level. To develop more appropriate bump-up factors for EPU MSL signal estimates, please submit the following:
a) Power-spectral densities (PSDs) of in-plant MSL measurements at 80 percent, 85 percent, 90 percent, 95 percent, 97 percent, and 100 percent of CLTP. The PSDs provided as part of this response should be clearly labeled.
b) In-plant data trends related to pressure RMS amplitude for the total PSD and for individ.ual resonance peaks of the aforementioned safety valves and blind flanges. In trending the amplitudes of the resonance peaks, the integration frequency range must be sufficiently narrow and centered at the resonance frequency so that the broadband noise does not affect the trends (i.e., it does not artificially reduce growth rate of the resonance peaks).
c) For each standpipe resonance frequency, please provide a plot of dimensionless pressure 2
in the MSLs (i.e., Prmsl Y2 pV ) against the reduced velocity in the MSL (i.e., V/fr D). In these dimensionless forms, all parameters refer to the MSLs data (e.g. Prms is the RMS amplitude of acoustic pressure, V and pare the steam velocity and density, fr is the standpipe resonance,frequency, and D is the standpipe diameter).
d) Provide data and plots from SMT, similar to those described in item (c), above.
e) Provide data and plots from in-plant measurements obtained from QC2, similar to those described in item (c), above.
f) -.Compare the trends of the data obtained in items (c) through (e), above.
g) Explain the method used to develop conservative bump-up factors for the SRV resonance peaks from CLTP to EPU conditions.
EMCB-SD-RAI-11 In Section 4.1 of WCAP 17611-P, the licensee indicates that ((
)). Based on previous EPU license amendment request reviews, the NRC staff noticed that the tank pressure during this measurement period decreases from 190 psig to approximately 130 psig. The resulting decrease in the fluid density at the standpipes along the MSLs is expected to reduce the flow energy (i.e., the dynamic head) exciting the resonances in OFFICIAL USE ONLY PROPRIETARY INFORMATION
OFFICIAL USE ONLY PROPRIETARY INFORMATION the standpipes. Please explain how this effect is accounted for in correcting the pressure spectra obtained over the (( )) period of measurement.
EMCB-SD-RAI-12 Although the MSLs at PBAPS contain dead-leg pipes on MSLs B and C, the licensee does not discuss the effect of the low frequency acoustic modes of these pipes on the RSD load definition. Therefore, you are requested to:
a) Provide the frequencies of the lowest acoustic modes of the dead-leg pipes.
b) Discuss whether the response of these modes was observed in the in-plant measurements or the SMT results.
c) Explain the effect of these acoustic modes on the RSD acoustic loading.
EMCB-SD-RAI-13 The simulated dryer loading at 102 percent of the EPU power level are presented in Table 3-5 and Figures 3-2 through 3-5 of WCAP-17590-P 2 , "Peach Bottom Units 2 & 3 Replacement Steam Dryer Acoustic Load Definition." These figures and table display considerable differences between PBAPS Units 2 and 3, although these units are supposed to be identical and have similar specific bias and uncertainties, as listed in Table 3-3. Please explain the sources of these relatively large differences in the total RMS differential pressure (Table 3-5) and the broadband excitation at low and high frequencies, especially on the dryer quadrants A and C. Provide contour plots of the differential pressures on the dryers of PBAPS 2 and 3 over all four quadrants for: (a) all signals between 0 and 250 Hz; (b) signals between 0 and 60 Hz; (c) signals spanning the SRV resonance near 130 Hz; and (d) signals spanning the blind flange resonance near 220 Hz. These plots should use a common contour color scale so that the plots may be easily compared. Also, provide overlays of the PBAPS 2 and 3 raw and filtered MSL spectra for all eight locations (e.g., plot PBAPS 2 versus PBAPS 3 MSL location 1 unfiltered, PBAPS 2 versus PBAPS 3-MSL location 1 filtered, PBAPS 2 versus PBAPS 3 MSL location 2 unfiltered, etc.). Additionally, overlay the monopole and dipole terms for PBAPS 2 and 3 for each MSL inlet. Interpret this information to explain the differences in loading between PBAPS 2 and 3.
EMCB-SD-RAI-14 In the course of the review of the enclosures to Attachment 17 to the application dated September 28, 2012, the NRC staff has noted several references to the Boiling Water Reactor Vessels and Internals Project (BWRVIP)-194, "Methodologies for Demonstrati11g Steam Dryer Integrity for Power Uprate," report. Since this report has not yet been approved for use by the NRC staff, please extract the relevant information from BWRVIP-194 used to support the PBAPS EPU amendment request, and provide a summary of the information used from the report.
2 WCAP-17590-P, which is a proprietary document, is included as Enclosure 178.1 to Attachment 17 of the licensee's application dated September 28, 2012. A publicly available version of this document is included as Enclosure 158.1 to Attachment 15 of the application.
OFFICIAL USE ONLY PROPRIETARY INFORMATION
OFFICIAL USE ONLY PROPRIETARY INFORMATION EMCB-SD-RAI-15 In Attachment 9 to the licensee's letter dated February 15, 2013, it is noted that the bias and uncertainty associated with the structu!al finite element dynamic modeling of the dryers is primarily associated with modeling procedures such as the use of shell elements, the element spacing, and coupling of shell and solid modeling sections. It is indicated that you use a procedure similar to that L.ised for the (( 11 steam dryer model, with the exception of using (( )) instead of shells embedded within solids to connect different sections. You also cite internal studies showing the use of (( 11 actually reduces uncertainty slightly, but does not take credit for this in the PBAPS EPU application. You point out that on-dryer measurements are planned to confirm the "... conservatism in the predicted ACM 4.1 results prior to exceeding CLTP." Based on the above, the NRC staff requests the following information regarding this subject:.
Please submit a detailed instrumentation and measurement plan to measure natural frequencies and mode shapes, pressures acting on the dryer, and the dr~er strains and accelerations to confirm that the dryer stresses are within acceptable limits. This plan should
- include how the measurement locations are relevant to the high loading and stress regions in the dryer and a priori predictions of the expected strain and pressure spectra and peak/rms values. You should consider ensuring that both the upper dryer, including the different hood sections, and the lower dryer (skirt) are sufficiently instrumented.
OFFICIAL USE ONLY PROPRIETARY INFORMATION