|
|---|
Category:Response to Request for Additional Information (RAI)
MONTHYEARNMP1L3545, Supplemental Information Letter to Adopt TSTF-505, Provide Risk- Informed Extended Completion Times - RITSTF Initiative 4b, Revision 2 and 10 CFR 50.69, Risk-informed Categorization and Treatment of Structures, Systems .2023-08-0404 August 2023
Supplemental Information Letter to Adopt TSTF-505, Provide Risk- Informed Extended Completion Times - RITSTF Initiative 4b, Revision 2 and 10 CFR 50.69, Risk-informed Categorization and Treatment of Structures, Systems .
NMP1L3519, Submittal of Emergency Relief Request I5R-11 Concerning the Installation of a Weld Overlay on Reactor Pressure Vessel Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld (32-WD-208)2023-03-30030 March 2023
Submittal of Emergency Relief Request I5R-11 Concerning the Installation of a Weld Overlay on Reactor Pressure Vessel Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld (32-WD-208)
NMP1L3516, Submittal of Emergency Relief Request I5R-11 Concerning the Installation of a Weld Overlay on Reactor Pressure Vessel Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld (32-WD-208)2023-03-29029 March 2023
Submittal of Emergency Relief Request I5R-11 Concerning the Installation of a Weld Overlay on Reactor Pressure Vessel Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld (32-WD-208)
NMP1L3478, Response to Request for Additional Information - Relief Request Associated with Pump Periodic Verification Tests of Core Spray System Pumps2022-08-0505 August 2022
Response to Request for Additional Information - Relief Request Associated with Pump Periodic Verification Tests of Core Spray System Pumps
RS-22-027, Constellation, Response to Request for Additional Information Regarding Application to Revise Technical Specifications to Adopt TSTF-541 Revision 2, Add Exceptions to Surveillance Requirements for Valves and Dampers Locked in the Actuated2022-02-23023 February 2022
Constellation, Response to Request for Additional Information Regarding Application to Revise Technical Specifications to Adopt TSTF-541 Revision 2, Add Exceptions to Surveillance Requirements for Valves and Dampers Locked in the Actuated P
NMP1L3447, Constellation Energy Generation, LLC - Response to Request for Additional Information - Proposed Relief Request Associated with Reactor Pressure Vessel Water Level Instrumentation Partial Penetration Nozzle Repairs2022-02-0202 February 2022
Constellation Energy Generation, LLC - Response to Request for Additional Information - Proposed Relief Request Associated with Reactor Pressure Vessel Water Level Instrumentation Partial Penetration Nozzle Repairs
NMP2L2794, Supplemental Information to Support Review of Nine Mile Point Nuclear Station, Unit 2, License Amendment Request to Adopt TSTF-582, Revision 02022-01-11011 January 2022
Supplemental Information to Support Review of Nine Mile Point Nuclear Station, Unit 2, License Amendment Request to Adopt TSTF-582, Revision 0
NMP2L2789, Response to Request for Additional Information by the Office of Reactor Regulation to Support Review of License Amendment Request to Adopt TSTF-582, Revision 02021-12-16016 December 2021
Response to Request for Additional Information by the Office of Reactor Regulation to Support Review of License Amendment Request to Adopt TSTF-582, Revision 0
NMP2L2787, Response to Request for Additional Information - Relief Request Associated with Excess Flow Check Valves2021-11-15015 November 2021
Response to Request for Additional Information - Relief Request Associated with Excess Flow Check Valves
JAFP-21-0087, Response to Request for Additional Information Regarding Request for Approval of Transfer of Licenses and Conforming Amendments2021-09-16016 September 2021
Response to Request for Additional Information Regarding Request for Approval of Transfer of Licenses and Conforming Amendments
NMP2L2773, Company - Response to Request for Additional Information2021-06-30030 June 2021
Company - Response to Request for Additional Information
JAFP-21-0044, Response to Request for Additional Information Regarding Request for Approval of Transfer of Licenses and Conforming Amendments2021-06-11011 June 2021
Response to Request for Additional Information Regarding Request for Approval of Transfer of Licenses and Conforming Amendments
NMP1L3402, Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of License Amendment Request to Adopt TSTF-582, Revision 02021-06-0404 June 2021
Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of License Amendment Request to Adopt TSTF-582, Revision 0
JAFP-21-0032, Response to Request for Additional Information - Proposed Alternative Concerning ASME Section XI Repair/Replacement Documentation for Replacement of Pressure Retaining Bolting2021-04-20020 April 2021
Response to Request for Additional Information - Proposed Alternative Concerning ASME Section XI Repair/Replacement Documentation for Replacement of Pressure Retaining Bolting
NMP1L3376, Supplemental Information to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Adopt TSTF-334, Revision 22021-01-27027 January 2021
Supplemental Information to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Adopt TSTF-334, Revision 2
NMP1L3373, Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of License Amendment Request to Adopt TSTF-334, Revision 22021-01-22022 January 2021
Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of License Amendment Request to Adopt TSTF-334, Revision 2
NMP2L2754, Responses to Request for Additional Information Questions 27 and 28 to Adopt TSTF-505, Provide Risk- Informed Extended Completion Times - RITSTF Initiative 4b, Revision 22021-01-0707 January 2021
Responses to Request for Additional Information Questions 27 and 28 to Adopt TSTF-505, Provide Risk- Informed Extended Completion Times - RITSTF Initiative 4b, Revision 2
NMP2L2749, Responses to Request for Additional Information Questions 17 and 26 for Nine Mile Point Nuclear Station, Unit 2, to Adopt TSTF-505, Provide Risk- Informed Extended Completion Times - RITSTF Initiative 4b, Rev. 22020-10-22022 October 2020
Responses to Request for Additional Information Questions 17 and 26 for Nine Mile Point Nuclear Station, Unit 2, to Adopt TSTF-505, Provide Risk- Informed Extended Completion Times - RITSTF Initiative 4b, Rev. 2
NMP2L2745, Request for Additional Information for Nine Mile Point Nuclear Station, Unit 2, to Adopt TSTF-505, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b, Revision 22020-10-0202 October 2020
Request for Additional Information for Nine Mile Point Nuclear Station, Unit 2, to Adopt TSTF-505, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b, Revision 2
RS-20-112, Response to Request for Additional Information Related to License Amendment Request to Adopt TSTF-5682020-09-0303 September 2020
Response to Request for Additional Information Related to License Amendment Request to Adopt TSTF-568
NMP2L2742, Response to Request for Additional Information by NRR to Support Review of Nine Mile Point Nuclear Station, Unit 2, License Amendment Request Re Risk Informed Categorization & Structures, Systems and Components2020-08-28028 August 2020
Response to Request for Additional Information by NRR to Support Review of Nine Mile Point Nuclear Station, Unit 2, License Amendment Request Re Risk Informed Categorization & Structures, Systems and Components
ML20188A2642020-07-0606 July 2020
Clinton Power Station, R.E. Ginna Station, Limerick Station, Nine Mile Point Station & Peach Bottom Station - Proposed Alternative to Utilize Code Case OMN-26 - Response to Request for Additional Information
NMP2L2713, Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 2, License Amendment Request to Increase Allowable MSIV Leakage Rates2019-11-21021 November 2019
Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 2, License Amendment Request to Increase Allowable MSIV Leakage Rates
NMP2L2711, Byron Station; Calvert Cliffs; Clinton Power Station; LaSalle County Station; Limerick Generating Station; and Nine Mile Point Nuclear Station - Proposed Alternative to Utilize Code Case N-8792019-10-16016 October 2019
Byron Station; Calvert Cliffs; Clinton Power Station; LaSalle County Station; Limerick Generating Station; and Nine Mile Point Nuclear Station - Proposed Alternative to Utilize Code Case N-879
JAFP-19-0057, Response to Request for Additional Information - Proposed Alternative to Utilize Code Cases N-878 and N-8802019-06-0404 June 2019
Response to Request for Additional Information - Proposed Alternative to Utilize Code Cases N-878 and N-880
NMP1L3279, Response to Request for Additional Information - Proposed Alternatives to Utilize Code Cases N-878 and N-880 for Plants2019-05-0101 May 2019
Response to Request for Additional Information - Proposed Alternatives to Utilize Code Cases N-878 and N-880 for Plants
NMP1L3264, Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Revise Technical Specifications 3.3.1 for Primary Contain2019-02-25025 February 2019
Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Revise Technical Specifications 3.3.1 for Primary Containm
JAFP-19-0006, Response to Request for Additional Information - Proposed Alternative to Utilize Code Cases N-878 and N-8802019-01-0808 January 2019
Response to Request for Additional Information - Proposed Alternative to Utilize Code Cases N-878 and N-880
NMP2L2695, Supplement Information and Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of an Emergency License Amendment Request for One Time Extension to The.2018-12-0707 December 2018
Supplement Information and Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of an Emergency License Amendment Request for One Time Extension to The.
NMP1L3248, Supplement to the Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Apply TSTF-542, Revision 2, Reactor Pre2018-11-0202 November 2018
Supplement to the Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Apply TSTF-542, Revision 2, Reactor Pres
NMP1L3238, Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Apply TSTF-542, ...2018-10-0101 October 2018
Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Apply TSTF-542, ...
NMP1L3233, Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 1, Removal of Boraflex Credit License Amendment Request (L-2018-LLA-0039)2018-08-17017 August 2018
Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 1, Removal of Boraflex Credit License Amendment Request (L-2018-LLA-0039)
NMP1L3221, Independent Spent Fuel Storage Installation, Nine Mile Point, Units 1 & 2, R. E. Ginna - Response to Request for Additional Information License Amendment Request to Adopt Emergency Action Level Schemes.2018-05-10010 May 2018
Independent Spent Fuel Storage Installation, Nine Mile Point, Units 1 & 2, R. E. Ginna - Response to Request for Additional Information License Amendment Request to Adopt Emergency Action Level Schemes.
RS-18-061, Response to Request for Additional Information Regarding Decommissioning Funding Plans for Independent Spent Fuel Storage Installations (Isfsis)2018-05-0202 May 2018
Response to Request for Additional Information Regarding Decommissioning Funding Plans for Independent Spent Fuel Storage Installations (Isfsis)
ML18025A7992018-01-25025 January 2018
Response to Request for Additional Information Regarding Generic Letter 2016-01
NMP2L2662, Supplemental Information for Nine Mile Point Nuclear Station, Unit 2, to Adopt TSTF-542, Reactor Pressure Vessel Water Inventory Control, Revision 22017-12-27027 December 2017
Supplemental Information for Nine Mile Point Nuclear Station, Unit 2, to Adopt TSTF-542, Reactor Pressure Vessel Water Inventory Control, Revision 2
NMP2L2658, Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 2, License Amendment Request to Adopt TSTF-542, Revision 2, Reactor Pressure Vessel Water2017-11-0303 November 2017
Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 2, License Amendment Request to Adopt TSTF-542, Revision 2, Reactor Pressure Vessel Water
NMP1L3180, Submittal of Relief Request NMP-RR-001 Concerning Nozzle-to-Vessel Weld and Inner Radii Examinations (Use of Code Case N-702)2017-09-18018 September 2017
Submittal of Relief Request NMP-RR-001 Concerning Nozzle-to-Vessel Weld and Inner Radii Examinations (Use of Code Case N-702)
RS-17-053, Response to Request for Additional Information Regarding Generic Letter 2016-012017-04-27027 April 2017
Response to Request for Additional Information Regarding Generic Letter 2016-01
NMP1L3146, Response to Request for Additional Information to Relief to Perform Pressure Isolation Valve Leakage Testing at Frequencies Consistent with 10 CFR 50, Appendix J2017-04-0606 April 2017
Response to Request for Additional Information to Relief to Perform Pressure Isolation Valve Leakage Testing at Frequencies Consistent with 10 CFR 50, Appendix J
RS-17-044, Response to Request for Additional Information Regarding Proposed Alternative for the Use of Encoded Phased Array Ultrasonic Examination Techniques in Lieu of Radiography2017-03-13013 March 2017
Response to Request for Additional Information Regarding Proposed Alternative for the Use of Encoded Phased Array Ultrasonic Examination Techniques in Lieu of Radiography
RS-17-027, Response to March 12, 2012, Request for Information Enclosure 2, Recommendation 2.1, Flooding, Required Response 3, Flooding Focused Evaluation Summary Submittal2017-03-10010 March 2017
Response to March 12, 2012, Request for Information Enclosure 2, Recommendation 2.1, Flooding, Required Response 3, Flooding Focused Evaluation Summary Submittal
ML17037A2652017-02-0606 February 2017
Response to Request for Information Concerning Regional Meteorological Conditions Characterizing Atmospheric Transport Processes within 50 Miles of the Plant
RA-16-049, Response to Request for Additional Information Regarding Requests to Withhold Emergency Preparedness Documents from Public Disclosure2016-05-26026 May 2016
Response to Request for Additional Information Regarding Requests to Withhold Emergency Preparedness Documents from Public Disclosure
ML16131A6542016-05-0404 May 2016
Response to a Question Raised During the Audit
ML16131A6552016-05-0404 May 2016
White Paper Prepared in Response to a Question Raised During the Audit
NMP2L2616, Supplemental Response to Request for Additional Information by NRR to Support Review of Relocation of Secondary Containment Bypass Leakage Paths Table from Technical Specifications to the Technical Requirements Manual2016-03-21021 March 2016
Supplemental Response to Request for Additional Information by NRR to Support Review of Relocation of Secondary Containment Bypass Leakage Paths Table from Technical Specifications to the Technical Requirements Manual
NMP1L3068, Supplemental Information to Request for Additional Information - Application for Technical Specification Change Regarding Risk-Informed Justification for the Relocation of Specific Surveillance Frequency Requirements to A....2016-01-25025 January 2016
Supplemental Information to Request for Additional Information - Application for Technical Specification Change Regarding Risk-Informed Justification for the Relocation of Specific Surveillance Frequency Requirements to A....
NMP2L2611, Response to Request for Additional Information by NRR to Support Review of Relocation of Secondary Containment Bypass Leakage Paths Table from Technical Specifications to the Technical Requirements Manual2016-01-0808 January 2016
Response to Request for Additional Information by NRR to Support Review of Relocation of Secondary Containment Bypass Leakage Paths Table from Technical Specifications to the Technical Requirements Manual
NMP1L3064, Supplemental Response to Request for Additional Information - Application for Technical Specification Change Regarding Risk-Informed Justification for the Relocation of Specific Surveillance Frequency Requirements....2015-12-22022 December 2015
Supplemental Response to Request for Additional Information - Application for Technical Specification Change Regarding Risk-Informed Justification for the Relocation of Specific Surveillance Frequency Requirements....
2023-08-04
[Table view] |
Text
Attachment 4 White Paper Prepared in Response to a Question Raised During the Audit (Nonproprietary)
This Report Does Not Contain CDI Proprietary Information CDI White Paper: 16-0SNP Significance of Steam Dryer Fluid-Structural Interaction - CDI Perspective In Response to Nine Mile Point Unit 2 Audit Revision 0 Prepared by Alexander H. Boschitsch Reviewed by Alan]. Bilanin Continuum Dynamics, Inc.
34 Lexington Avenue Ewing, NJ 08618 April 21, 2016 1of8
This Report Does Not Contain CDI Proprietary Information Significance of Fluid Structure Interaction in Steam Dryers - CDI Perspective
((
(3J))
Fluid-Structure Interaction in Steam Dryer Analysis The general phenomenon of fluid-structural interaction refers to the mutual coupling between the fluid (here, acoustic) and structural response. In the general case: (A) the fluid pressure impresses a load on the structure thus causing it to dynamically deform; and (B) simultaneously, the fluid response induces an acoustic contribution that modifies the surrounding pressure field.
Prior stress evaluations have generally accounted for the ((
(3J))
In the CDI 14-08 stress report, ((
(3J))
In 3D, the acoustic field is more complicated and additional inertial and stiffness contributions also arise. However, as with perforated plate damping, these complicating effects were conservatively accounted for ((
C3l)) However, during a technical review for Nine Mile Point Unit 2 with the NRC staff and consultants held at the CDI office on February 18, 2016, a presentation by an NRC consultant attempted to show that the effect of vibration-induced loading is even lower than this 42.5% value.
To support this assessment, two examples involving vibrating plates in unbounded domains were referenced (see also [2]). While the solutions and acoustic behaviors of those examples are well known, CDI does not believe they are representative of the confined region acoustics of steam dryers as we aim to demonstrate below.
((
(3J))
2 of8
This Report Does Not Contain CDI Proprietary Information
((
(3J))
((
(3J))
Figure 1. Pressure measurements on the Quad Cities steam dryer at the co-located pressure transducers PT20 (outside) and PT14 (inside) at 790 and 930 MWe operating conditions.
Model Problems by the NRC Consultant
((
(3)))
However, during the NRC technical review held at the CDI office on 02-18-2016, this value was challenged on the basis of two 'model' problems which would indicate that the FSI load is considerably smaller. The first model problem considers a loudspeaker in a large volume and the other examines the propagation of waves on infinite structures. Both examples are described in the 3 ofB
This Report Does Not Contain CDI Proprietary Information Structural Acoustics Tutorial published in Acoustics Today April 2007, particularly Part 2 of this tutorial. While the solutions and physics of these examples have long been understood, they are not representative of steam dryer geometries since they omit the effects of confinement in a closed 3D geometry.
In the first example, formula (5) in [2] provides the in-phase component of pressure P induced on the piston due to its own velocity u (i.e., the real part of the impedance) as p ( Ji(Zroa/ c)l
-=pell-u (roa/ c) j =pcK where p is the fluid density, c is the fluid acoustic speed, co is the circular forcing frequency, and a is the piston radius. K equates to the adjustment factor used to correct lD VIL. For the piston in an infinite domain, K depends on the Bessel function J1 and is plotted in the upper diagram of Figure 4 in [2]. Note that when coa/c=rr./2, then K=0.82. ((
(3J)]
The other model problem considers the effects of a plate (finite or infinite) that is again adjacent to an infinite space. The physics of waves radiating or decaying and the manner in which these effects are characterized in terms of sub- or super-sonic bending waves are also well understood and not in dispute. The phenomenon explains, for example, why sonic booms generated by supersonic aircraft produce a loud effect on the surface (and thus are banned for over land transport) while subsonic aircraft do not. However, the acoustics of infinite plates next to infinite steam volumes do not correspond to those of steam dryers except for higher order (and high frequency) modes.
The Effects of Confinement
((
(3)))
4of8
This Report Does Not Contain CDI Proprietary Information
((
(3J])
The high frequency case also reveals other nuances that arise in full 30 analysis. ((
(3))) This is explained by noting that the acoustic field supports different vertical modes at each frequency, resulting in different pressure distributions. Note too that the plots here show the real part of the complex pressure (i.e., in phase with the velocity); an imaginary component (not shown) also is present which, for this particular geometry, generally corresponds to a spring force (but in general could also include contributions from acceleration, jerk and other higher order rate terms).
hood supports Figure 2. Steam dryer section associated with hood section, hood supports and vane bank.
5of8
This Report Does Not Contain CDI Proprietary Information
((
(3J))
Figure 3. Geometry and boundary conditions for vibration-induced pressure example.
((
(3J))
6of8
This Report Does Not Contain CDI Proprietary Information
((
(3J))
Figure 4. Pressure field produced by moving surface. Left to right corresponds to forcing frequencies of 30 Hz, 60 Hz and 120 Hz respectively. Pressures are normalized by puc where p is the density of steam, c is the acoustic speed and u is the velocity amplitude. ((
(3)))
7 ofB
This Report Does Not Contain CDI Proprietary Information Summary The basis for ((
(3J))
References
- 1. Continuum Dynamics, Inc. (2014) Stress Re-Evaluation of Nine Mile Point Unit 2 Steam Dryer at 115% CLTP. C.D.I. Report No. 14-0BP (Proprietary), July.
- 2. Hambric, Stephen A. and John B. Fahnline, Structural acoustics tutorial, Part 2: Sound - Structure Interaction. Acoustics Today, 2007. 3(2): p. 9-27.
BofB
Attachment 4 White Paper Prepared in Response to a Question Raised During the Audit (Nonproprietary)
This Report Does Not Contain CDI Proprietary Information CDI White Paper: 16-0SNP Significance of Steam Dryer Fluid-Structural Interaction - CDI Perspective In Response to Nine Mile Point Unit 2 Audit Revision 0 Prepared by Alexander H. Boschitsch Reviewed by Alan]. Bilanin Continuum Dynamics, Inc.
34 Lexington Avenue Ewing, NJ 08618 April 21, 2016 1of8
This Report Does Not Contain CDI Proprietary Information Significance of Fluid Structure Interaction in Steam Dryers - CDI Perspective
((
(3J))
Fluid-Structure Interaction in Steam Dryer Analysis The general phenomenon of fluid-structural interaction refers to the mutual coupling between the fluid (here, acoustic) and structural response. In the general case: (A) the fluid pressure impresses a load on the structure thus causing it to dynamically deform; and (B) simultaneously, the fluid response induces an acoustic contribution that modifies the surrounding pressure field.
Prior stress evaluations have generally accounted for the ((
(3J))
In the CDI 14-08 stress report, ((
(3J))
In 3D, the acoustic field is more complicated and additional inertial and stiffness contributions also arise. However, as with perforated plate damping, these complicating effects were conservatively accounted for ((
C3l)) However, during a technical review for Nine Mile Point Unit 2 with the NRC staff and consultants held at the CDI office on February 18, 2016, a presentation by an NRC consultant attempted to show that the effect of vibration-induced loading is even lower than this 42.5% value.
To support this assessment, two examples involving vibrating plates in unbounded domains were referenced (see also [2]). While the solutions and acoustic behaviors of those examples are well known, CDI does not believe they are representative of the confined region acoustics of steam dryers as we aim to demonstrate below.
((
(3J))
2 of8
This Report Does Not Contain CDI Proprietary Information
((
(3J))
((
(3J))
Figure 1. Pressure measurements on the Quad Cities steam dryer at the co-located pressure transducers PT20 (outside) and PT14 (inside) at 790 and 930 MWe operating conditions.
Model Problems by the NRC Consultant
((
(3)))
However, during the NRC technical review held at the CDI office on 02-18-2016, this value was challenged on the basis of two 'model' problems which would indicate that the FSI load is considerably smaller. The first model problem considers a loudspeaker in a large volume and the other examines the propagation of waves on infinite structures. Both examples are described in the 3 ofB
This Report Does Not Contain CDI Proprietary Information Structural Acoustics Tutorial published in Acoustics Today April 2007, particularly Part 2 of this tutorial. While the solutions and physics of these examples have long been understood, they are not representative of steam dryer geometries since they omit the effects of confinement in a closed 3D geometry.
In the first example, formula (5) in [2] provides the in-phase component of pressure P induced on the piston due to its own velocity u (i.e., the real part of the impedance) as p ( Ji(Zroa/ c)l
-=pell-u (roa/ c) j =pcK where p is the fluid density, c is the fluid acoustic speed, co is the circular forcing frequency, and a is the piston radius. K equates to the adjustment factor used to correct lD VIL. For the piston in an infinite domain, K depends on the Bessel function J1 and is plotted in the upper diagram of Figure 4 in [2]. Note that when coa/c=rr./2, then K=0.82. ((
(3J)]
The other model problem considers the effects of a plate (finite or infinite) that is again adjacent to an infinite space. The physics of waves radiating or decaying and the manner in which these effects are characterized in terms of sub- or super-sonic bending waves are also well understood and not in dispute. The phenomenon explains, for example, why sonic booms generated by supersonic aircraft produce a loud effect on the surface (and thus are banned for over land transport) while subsonic aircraft do not. However, the acoustics of infinite plates next to infinite steam volumes do not correspond to those of steam dryers except for higher order (and high frequency) modes.
The Effects of Confinement
((
(3)))
4of8
This Report Does Not Contain CDI Proprietary Information
((
(3J])
The high frequency case also reveals other nuances that arise in full 30 analysis. ((
(3))) This is explained by noting that the acoustic field supports different vertical modes at each frequency, resulting in different pressure distributions. Note too that the plots here show the real part of the complex pressure (i.e., in phase with the velocity); an imaginary component (not shown) also is present which, for this particular geometry, generally corresponds to a spring force (but in general could also include contributions from acceleration, jerk and other higher order rate terms).
hood supports Figure 2. Steam dryer section associated with hood section, hood supports and vane bank.
5of8
This Report Does Not Contain CDI Proprietary Information
((
(3J))
Figure 3. Geometry and boundary conditions for vibration-induced pressure example.
((
(3J))
6of8
This Report Does Not Contain CDI Proprietary Information
((
(3J))
Figure 4. Pressure field produced by moving surface. Left to right corresponds to forcing frequencies of 30 Hz, 60 Hz and 120 Hz respectively. Pressures are normalized by puc where p is the density of steam, c is the acoustic speed and u is the velocity amplitude. ((
(3)))
7 ofB
This Report Does Not Contain CDI Proprietary Information Summary The basis for ((
(3J))
References
- 1. Continuum Dynamics, Inc. (2014) Stress Re-Evaluation of Nine Mile Point Unit 2 Steam Dryer at 115% CLTP. C.D.I. Report No. 14-0BP (Proprietary), July.
- 2. Hambric, Stephen A. and John B. Fahnline, Structural acoustics tutorial, Part 2: Sound - Structure Interaction. Acoustics Today, 2007. 3(2): p. 9-27.
BofB
