GNRO-2012/00107, Vibration Data Report and Commitment Change
| ML12254A178 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 09/06/2012 |
| From: | Ford B Entergy Operations |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| GNRO-2012/00107 | |
| Download: ML12254A178 (12) | |
Text
GNRO-2012/00107 September 6, 2012 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
SUBJECT:
Vibration Data Report and Commitment Change Grand Gulf Nuclear Station, Unit 1 Docket No. 50-416 License No. NPF-29
REFERENCES:
- 1.
Entergy Operations, Inc. letter to the NRC (GNRO-2012/00079),
Summary Report of Replacement Steam Dryer Data - Responses to Requests for Additional Information, August 7, 2012 (ADAMS Accession No. ML12221A198)
- 2.
Entergy Operations, Inc. letter to the NRC (GNRO-2011/00033),
Supplemental Information - Extended Power Uprate, September 9, 2011 (ADAMS Accession No. ML112521284)
Dear Sir or Madam:
In Reference 1, Entergy Operations, Inc. (Entergy) committed to provide vibration data along with acceptance limits for the main steam line (MSL) and the MSL safety relief valves (SRVs) for Grand Gulf Nuclear Station based on data collected at various power plateaus during the Extended Power Uprate (EPU) power ascension testing program. The vibration data collected at ~4306 MWt [110% of 3898 MWt, the previous licensed thermal power (PLTP)] is provided in the attachment to this letter.
In addition to transmitting the vibration data report, by this letter Entergy is notifying the NRC of a change to a commitment made in Reference 2. Specifically, the commitment previously stated:
EPU startup testing would be performed as described in Attachment 9, Extended Power Uprate Startup Test Plan, with the exception of EPU Test 10 - IRM Performance.
The EPU Startup Test Plan specifies EPU Tests 100, Main Steam and Feedwater Piping Vibration, and 101, Plant Parameter Monitoring, to be performed during power ascension to EPU conditions (4408 MWt) from 100% PLTP in step increases of 2.5% reactor power.
Entergy has changed the commitment to read as follows (changes in italics):
Entergy Operations, Inc.
1340 Echelon Parkway Jackson, MS 39213 Bryan S. Ford Sr. Manager, Licensing Tel. (601) 368-5516
GNRO-2012/00107 Page 2 of 2 EPU startup testing would be performed as described in Attachment 9, Extended Power Uprate Startup Test Plan, with the exception of EPU Test 10 - IRM Performance. In addition, performing EPU Tests 100 and 101 at Test Condition (TC) 12.5 may be delayed until TC EPU at the test directors direction provided acceptable performance is demonstrated at TC 10.
This change allows EPU Tests 100 and 101 to be performed at TC EPU, the final power ascension test plateau at 4408 MWt, vs. TC 12.5 at 4306 MWt, a 0.5% difference.
This change was discussed with the NRC Project Manager for GGNS on August 31, 2012.
The evaluation of this change is available for review at the site.
If you have any questions or require additional information, please contact Guy Davant at (601) 368-5756.
This letter contains no new regulatory commitments.
Sincerely, BSF/ghd
Attachment:
Vibration Data for the Main Steam Line Piping and Safety Relief Valves -
4306 MWt (110% PLTP) cc:
Mr. Elmo E. Collins, Jr.
Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 612 East Lamar Blvd., Suite 400 Arlington, TX 76011-4005 NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150 U. S. Nuclear Regulatory Commission ATTN: Mr. A. B. Wang, NRR/DORL (w/2)
ATTN: ADDRESSEE ONLY ATTN: Courier Delivery Only Mail Stop OWFN/8 B1 11555 Rockville Pike Rockville, MD 20852-2378 State Health Officer Mississippi Department of Health P. O. Box 1700 Jackson, MS 39215-1700
ATTACHMENT GRAND GULF NUCLEAR STATION GNRO-2012/00107 VIBRATION DATA FOR THE MAIN STEAM LINE PIPING AND SAFETY RELIEF VALVES 4306 MWt (110% PLTP)
Attachment to GNRO-2012/00107 Page 1 of 9 VIBRATION DATA FOR THE MAIN STEAM LINE PIPING AND SAFETY RELIEF VALVES 4306 MWt (110% PLTP)
I.
Main Steam Line (MSL) Piping Vibration Data and Acceptance Limits Table 1, below, contains the results from the MSL piping vibration testing performed as part of the GGNS Extended Power Uprate (EPU) Power Ascension Test Plan (PATP) at 4306 MWt
[110% of 3898 MWt, the previous licensed thermal power (PLTP)].
The measured accelerations were taken in the major axes for each of the nodes. A band pass filter (RMS) for the test data was applied based on:
Lower Limit - Capturing frequencies below the lowest piping frequency which corresponds to the highest piping stresses. Generally, this number is higher than 1 Hz, which typically contains voltage drift and DC signals that need to be removed.
Upper Limit - The upper limit frequency should be sufficiently high so that there is no significant modal participation on the maximum piping stresses. Also, the intent is to remove the high frequency noise, generally above 100 Hz.
The acceptance criteria are based on applying a constant 1g acceleration spectrum to the piping model and determining the maximum stress. The maximum stress was compared with the OM criteria alternating stress allowable per ASME OM-S/G-1997, Standards and Guides for Operation and Maintenance of Nuclear Power Plants. The resulting ratio was used to modify the output accelerations at the location for each of the test points.
Node 1008 of MSL-A has reported data that contained intermittent high-amplitude spikes.
These types of spikes were neither seen in the corresponding data for the other valves at the same valve location (top) nor in the data of at any of the nodes. For these reasons, the data at this location was deemed unusable.
Node 3010 of MSL-C has also reported data that indicates a failure in the mounting system.
Two sets of data were retrieved at the 105% power plateau. One was taken directly after the plateau was reached and a subsequent set was taken before the ascension to the 107.5%
plateau. While the plant data indicated a small increase in flow, there was a markedly higher increase in the X (longitudinal), Y (vertical), and Z (lateral) acceleration at Node 3010 on MSL-C. This magnitude increase for Node 3010 of MSL-C is in excess of 2 standard deviations above the response noted for the other 15 SRVs. For this reason, the data at this location was also deemed unusable.
Attachment to GNRO-2012/00107 Page 2 of 9 Table 1 PIPING DESCRIPTION/
SEGMENT MONITOR LOC./DIR.
MEASURED ACCEL (g)
ACCEL.
LIMIT LEVEL 2 /
LEVEL 1 (g)
POINT NUM.
ACCEL.
LEVEL 2/
LEVEL 1 MARGIN (%)
NOTES Piping associated with B21-F041A (Top of Valve)
MSL-A, Node 1008 X
N/A 0.720 / 1.440 1X N/A Non-Operable Sensor Piping associated with B21-F041A (Top of Valve)
MSL-A, Node 1008 Y
N/A 0.160 / 0.320 1Y N/A Non-Operable Sensor Piping associated with B21-F041A (Top of Valve)
MSL-A, Node 1008 Z
N/A 0.671 / 1.341 1Z N/A Non-Operable Sensor Piping associated with B21-F041A (Actuator)
MSL-A, Node 1010 X
0.260 0.447 / 0.893 2X 41.8 / 70.9 Acceptable Piping associated with B21-F041A (Actuator)
MSL-A, Node 1010 Y
0.216 0.231 / 0.461 2Y 6.5 / 53.1 Acceptable Piping associated with B21-F041A (Actuator)
MSL-A, Node 1010 Z
0.190 0.434 / 0.868 2Z 56.2 / 78.1 Acceptable Piping associated with B21-F051A (Actuator)
MSL-A, Node 2010 X
0.180 0.349 / 0.697 3X 48.4 / 74.2 Acceptable Piping associated with B21-F051A (Actuator)
MSL-A, Node 2010 Y
0.219 0.224 / 0.447 3Y 2.2 / 51.0 Acceptable Piping associated with B21-F051A (Actuator)
MSL-A, Node 2010 Z
0.222 0.389 / 0.778 3Z 42.9 / 71.5 Acceptable Piping associated with B21-F047A (Actuator)
MSL-A, Node 4010 X
0.164 0.420 / 0.840 4X 61.0 / 80.5 Acceptable
Attachment to GNRO-2012/00107 Page 3 of 9 PIPING DESCRIPTION/
SEGMENT MONITOR LOC./DIR.
MEASURED ACCEL (g)
ACCEL.
LIMIT LEVEL 2 /
LEVEL 1 (g)
POINT NUM.
ACCEL.
LEVEL 2/
LEVEL 1 MARGIN (%)
NOTES Piping associated with B21-F047A (Actuator)
MSL-A, Node 4010 Y
0.008 0.310 / 0.619 4Y 97.4 / 98.7 Acceptable Piping associated with B21-F047A (Actuator)
MSL-A,Node 4010 Z
0.216 0.474 / 0.948 4Z 54.4 / 77.2 Acceptable Piping associated with B21-F051B (Top of Valve)
MSL-B, Node 1008 X
0.017 0.701 / 1.402 5X 97.6 / 98.8 Acceptable Piping associated with B21-F051B (Top of Valve)
MSL-B, Node 1008 Y
0.150 0.185 / 0.370 5Y 18.9 / 59.5 Acceptable Piping associated with B21-F051B (Top of Valve)
MSL-B, Node 1008 Z
0.422 0.756 / 1.512 5Z 44.2 / 72.1 Acceptable Piping associated with B21-F051F (Actuator)
MSL-B, Node 3010 X
0.006 0.389 / 0.778 6X 98.5 / 99.2 Acceptable Piping associated with B21-F051F (Actuator)
MSL-B, Node 3010 Y
0.039 0.212 / 0.424 6Y 81.6 / 90.8 Acceptable Piping associated with B21-F051F (Actuator)
MSL-B, Node 3010 Z
0.362 0.436 / 0.872 6Z 17.0 / 58.5 Acceptable Piping associated with B21-F041F (Top of Valve)
MSL-B, Node 4008 X
0.634 0.645 / 1.290 7X 1.7 / 50.9 Acceptable Piping associated with B21-F041F (Top of Valve)
MSL-B, Node 4008 Y
0.171 0.181 / 0.362 7Y 5.5 / 52.8 Acceptable Piping associated with B21-F041F (Top of Valve)
MSL-B, Node 4008 Z
0.733 0.800 / 1.600 7Z 8.4 / 54.2 Acceptable
Attachment to GNRO-2012/00107 Page 4 of 9 PIPING DESCRIPTION/
SEGMENT MONITOR LOC./DIR.
MEASURED ACCEL (g)
ACCEL.
LIMIT LEVEL 2 /
LEVEL 1 (g)
POINT NUM.
ACCEL.
LEVEL 2/
LEVEL 1 MARGIN (%)
NOTES Piping associated with B21-F041K (Top of Valve)
MSL-B, Node 6008 X
0.432 0.663 / 1.326 8X 34.8 / 67.4 Acceptable Piping associated with B21-F041K (Top of Valve)
MSL-B, Node 6008 Y
0.086 0.229 / 0.457 8Y 62.4 / 81.2 Acceptable Piping associated with B21-F041K (Top of Valve)
MSL-B, Node 6008 Z
0.409 0.677 / 1.353 8Z 40.0 / 69.8 Acceptable Piping associated with B21-F041C (Top of Valve)
MSL-C, Node 1008 X
0.695 0.701 / 1.402 9X 0.9 / 50.4 Acceptable Piping associated with B21-F041C (Top of Valve)
MSL-C, Node 1008 Y
0.113 0.185 / 0.370 9Y 38.9 / 69.5 Acceptable Piping associated with B21-F041C (Top of Valve)
MSL-C, Node 1008 Z
0.696 0.756 / 1.512 9Z 7.9 / 54.0 Acceptable Piping associated with B21-F051C (Actuator)
MSL-C, Node 3010 X
N/A 0.389 / 0.778 10AX N/A Non-Operable Sensor Piping associated with B21-F051C (Actuator)
MSL-C, Node 3010 Y
N/A 0.212 / 0.424 10AY N/A Non-Operable Sensor Piping associated with B21-F051C (Actuator)
MSL-C, Node 3010 Z
N/A 0.436 / 0.872 10AZ N/A Non-Operable Sensor Piping associated with B21-F047G (Top of Valve)
MSL-C, Node 4008 X
0.376 0.645 / 1.290 10BX 41.7 / 70.9 Acceptable Piping associated with B21-F047G (Top of Valve)
MSL-C, Node 4008 Y
0.047 0.181 / 0.362 10BY 74.0 / 87.0 Acceptable
Attachment to GNRO-2012/00107 Page 5 of 9 PIPING DESCRIPTION/
SEGMENT MONITOR LOC./DIR.
MEASURED ACCEL (g)
ACCEL.
LIMIT LEVEL 2 /
LEVEL 1 (g)
POINT NUM.
ACCEL.
LEVEL 2/
LEVEL 1 MARGIN (%)
NOTES Piping associated with B21-F047G (Top of Valve)
MSL-C, Node 4008 Z
0.649 0.800 / 1.600 10BZ 18.9 / 59.4 Acceptable Piping associated with B21-F047L (Top of Valve)
MSL-C, Node 6008 X
0.526 0.663 / 1.326 10CX 20.7 / 60.3 Acceptable Piping associated with B21-F047L (Top of Valve)
MSL-C, Node 6008 Y
0.212 0.229 / 0.457 10CY 7.4 / 53.6 Acceptable Piping associated with B21-F047L (Top of Valve)
MSL-C, Node 6008 Z
0.381 0.677 / 1.353 10CZ 43.7 / 71.8 Acceptable Piping associated with B21-F047D (Top of Valve)
MSL-D, Node 1008 X
0.267 0.720 / 1.440 10DX 62.9 / 81.5 Acceptable Piping associated with B21-F047D (Top of Valve)
MSL-D, Node 1008 Y
0.153 0.160 / 0.320 10DY 4.4 / 52.2 Acceptable Piping associated with B21-F047D (Top of Valve)
MSL-D, Node 1008 Z
0.291 0.671 / 1.341 10DZ 56.6 / 78.3 Acceptable Piping associated with B21-F047D (Actuator)
MSL-D, Node 1010 X
0.400 0.447 / 0.893 10EX 10.5 / 55.2 Acceptable Piping associated with B21-F047D (Actuator)
MSL-D, Node 1010 Y
0.153 0.231 / 0.461 10EY 33.8 / 66.8 Acceptable Piping associated with B21-F047D (Actuator)
MSL-D, Node 1010 Z
0.150 0.434 / 0.868 10EZ 65.4 / 82.7 Acceptable Piping associated with B21-F014D (Actuator)
MSL-D, Node 2010 X
0.198 0.349 / 0.697 10FX 43.3 / 71.6 Acceptable
Attachment to GNRO-2012/00107 Page 6 of 9 PIPING DESCRIPTION/
SEGMENT MONITOR LOC./DIR.
MEASURED ACCEL (g)
ACCEL.
LIMIT LEVEL 2 /
LEVEL 1 (g)
POINT NUM.
ACCEL.
LEVEL 2/
LEVEL 1 MARGIN (%)
NOTES Piping associated with B21-F014D (Actuator)
MSL-D, Node 2010 Y
0.089 0.224 / 0.447 10FY 60.3 / 80.1 Acceptable Piping associated with B21-F014D (Actuator)
MSL-D, Node 2010 Z
0.170 0.389 / 0.778 10FZ 56.3 / 78.1 Acceptable Piping associated with B21-F051D (Actuator)
MSL-D, Node 4010 X
0.399 0.420 / 0.840 10GX 5.0 / 52.5 Acceptable Piping associated with B21-F051D (Actuator)
MSL-D, Node 4010 Y
0.296 0.310 / 0.619 10GY 4.5 / 52.2 Acceptable Piping associated with B21-F051D (Actuator)
MSL-D, Node 4010 Z
0.369 0.474 / 0.948 10GZ 22.2 / 61.1 Acceptable Piping associated with Pipe Support N11G001H14 Turbine Bldg.
MSL-D, Node 412 X
0.089 0.213 / 0.426 15X 58.2 / 79.1 Acceptable II.
Main Steam Safety Relief Valve (SRV) Vibration Data and Acceptance Limits Table 2, below, contains the results from the SRV vibration testing performed as part of the GGNS EPU PATP at 4306 MWt (110% PLTP).
The resultant measured acceleration represents the combined peak accelerations reported by the tri-axial accelerometer at the particular node. This peak was gathered from the time-history data after band-pass filtering (2 - 250Hz) and DC-offset removal.
Node 1008 of MSL-A has reported data that contained intermittent high-amplitude spikes.
These types of spikes were neither seen in the corresponding data for the other valves at the same valve location (top) nor in the data of at any of the nodes. For these reasons, the data at this location was deemed unusable and the other limits related to MSL-A were adjusted to account for this.
Node 3010 of MSL-C has also reported data that indicates a failure in the mounting system.
Two sets of data were retrieved at the 105% power plateau. One was taken directly after the plateau was reached and a subsequent set was taken before the ascension to the 107.5%
Attachment to GNRO-2012/00107 Page 7 of 9 plateau. While the plant data indicated a small increase in flow, there was a markedly higher increase in the X (longitudinal), Y (vertical), and Z (lateral) acceleration at Node 3010 on MSL-C. This magnitude increase for Node 3010 of MSL-C is in excess of 2 standard deviations above the response noted for the other 15 SRVs. For this reason, the data at this location was also deemed unusable.
PSD comparisons were made of the MSL response at SRV monitoring points on two valves at Nodes 1008 and Node 3010. The PSD comparison for X, Y, and Z response shows a large change in frequency response through much of the 1-250Hz range at Node 3010 and only a small change in magnitude at the Node 1008 location. The three accelerometers at Node 3010 are mounted on the same block and strapped to the actuator. It is expected that the straps have loosened and the channel has shifted. Therefore, the measured response is most likely being affected by the response of the accelerometer mounting system and this measured response must be discounted. Based on the current methodology for developing limits through analytical methods, the limits for the other acceleration locations for the MSL-C do not need to be adjusted to account for the erroneous data at Node 3010 of MSL-C.
Table 2 COMP./PIPING DESCRIPTION /
SEGMENT POINT NUM.
MONITOR LOC./DIR.
ACCEL.
LIMIT (g)
ACCEL.
MEASURED (g)
ACCEL.
MARGIN
(%)
NOTES B21-F041A X
0.00 0.00 0
Non-Op Sensor Top of Valve 1
Y 0.00 0.00 0
Non-Op Sensor MSL-A, Node 1008 Z
0.00 0.00 0
Non-Op Sensor B21-F041A X
3.78 1.17 68.97 Actuator 2
Y 3.77 1.15 69.46 Acceptable MSL-A, Node 1010 Z
3.78 1.17 68.97 B21-F051A X
3.78 0.81 78.54 Actuator 3
Y 3.77 0.95 74.75 Acceptable MSL-A, Node 2010 Z
3.78 0.81 78.54 B21-F047A X
3.78 0.77 79.65 Actuator 4
Y 3.77 0.01 99.75 Acceptable MSL-A, Node 4010 Z
3.78 0.77 79.65 B21-F051B X
Top of Valve 5
Y 4.03 1.57 61.06 Acceptable MSL-B, Node 1008 Z
B21-F051F X
3.78 1.33 64.89 Actuator 6
Y 3.77 1.51 60.03 Acceptable MSL-B, Node 3010 Z
3.78 1.33 64.89 B21-F041F X
Top of Valve 7
Y 4.03 3.39 15.76 Acceptable MSL-B, Node 4008 Z
B21-F041K X
Top of Valve 8
Y 4.03 1.71 57.50 Acceptable MSL-B, Node 6008 Z
Attachment to GNRO-2012/00107 Page 8 of 9 COMP./PIPING DESCRIPTION /
SEGMENT POINT NUM.
MONITOR LOC./DIR.
ACCEL.
LIMIT (g)
ACCEL.
MEASURED (g)
ACCEL.
MARGIN
(%)
NOTES B21-F041C X
Top of Valve 9
Y 4.03 4.51
-12.04 See Note 1.
MSL-C, Node 1008 Z
B21-F051C X
0.00 0.00 0.00 Non-Op Sensor Actuator 10a Y
0.00 0.00 0.00 Non-Op Sensor MSL-C, Node 3010 Z
0.00 0.00 0.00 Non-Op Sensor B21-F047G X
Top of Valve 10b Y
4.03 2.66 34.02 Acceptable MSL-C, Node 4008 Z
B21-F047L X
Top of Valve 10c Y
4.03 1.57 60.96 Acceptable MSL-C, Node 6008 Z
B21-F047D X
Top of Valve 10d Y
4.03 1.47 63.53 Acceptable MSL-D, Node 1008 Z
B21-F047D X
3.78 2.50 33.89 Actuator 10e Y
3.77 1.03 72.79 Acceptable MSL-D, Node 1010 Z
3.78 2.50 33.89 B21-F041D X
3.78 1.12 70.41 Actuator 10f Y
3.77 0.91 75.75 Acceptable MSL-D, Node 2010 Z
3.78 1.12 70.41 B21-F051D X
3.78 1.40 62.81 Actuator 10g Y
3.77 0.50 86.83 Acceptable MSL-D, Node 4010 Z
3.78 1.40 62.81 Note 1: Based on the vibration data from the SRV, the acceleration level for valve Q1B21-F041C has reached the limit established based on qualification testing of the valves and actuators with conservative assumptions for endurance limits based on the peak limits of testing performed. The original acceleration limits based on testing data from Wyle Laboratories has conservatism due to the inherent limitations related to the shaker table testing. This testing configuration resulted in higher tested lateral and longitudinal accelerations than the vertical response. Revised limits have been developed at the top of valve location with analytical results developed from the use of the original ASME NB-3500 calculation based upon critical valve components for the actuator and applying a transfer function to the limits at the top of valve location.
For the horizontal accelerations measured at the top of valve, the resultant measured horizontal (lateral and longitudinal) acceleration represents the combined peak accelerations reported by the tri-axial accelerometer at the particular node in the X and Z-directions. For the vertical accelerations measured at the top of valve, these accelerations represent the vertical peak accelerations reported by the tri-axial accelerometer at the particular node in the Y-direction. The peak accelerations were gathered from the time-history data after band-pass filtering (2-250Hz) and DC-offset
Attachment to GNRO-2012/00107 Page 9 of 9 removal and compared to limits as noted above. These limits can be applied to any of the top of valve locations if needed.
These limits compared to measured values using this method are as follows:
COMP./PIPING DESCRIPTION /
SEGMENT POINT NUM.
MONITOR LOC./DIR.
ACCEL. LIMIT (g)
HORIZONTAL RESULTANT (X/Z) & VERTICAL (Y)
ACCEL. MEASURED (g)
HORIZONTAL RESULTANT (X/Z) & VERTICAL (Y)
ACCEL.
MARGIN
(%)
B21-F041C Top of Valve MSL-C, Node 1008 9
X/Z 6.62 (X/Z) 3.80 (X/Z) 42.60 (X/Z)
Y 3.42 (Y) 2.43 (Y) 28.95 (Y)