GNRO-2012/00113, Vibration Data Report

Vibration Data Report

ML12263A025
Person / Time
Site:	Grand Gulf
Issue date:	09/18/2012
From:	Ford B Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GNRO-2012/00113
Download: ML12263A025 (11)

Text

Entergy Operations, Inc.

1340 Echelon Parkway Jackson, MS 39213 Bryan S. Ford Senior Manager, Licensing Tel. (601) 368-5516 GNRO-2012/00113 September 18, 2012 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

Vibration Data Report Grand Gulf Nuclear Station, Unit 1 Docket No. 50-416 License No. NPF-29

REFERENCE:

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

1. ML12221A198)

Dear Sir or Madam:

In the referenced letter, Entergy Operations, Inc. (Entergy) committed to provide vibration data along with acceptance limits for the main steam line (MSL) piping 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 or near the current licensed thermal power of 4408 MWt (113% of 3898 MWt, the previous licensed thermal power) is provided in the attachment to this letter.

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 -

4408 MWt

GNRO- 2012/00113 Page 2 of 2 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 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 NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150

ATTACHMENT GRAND GULF NUCLEAR STATION GNRO-2012/00113 VIBRATION DATA FOR THE MAIN STEAM LINE PIPING AND SAFETY RELIEF VALVES -

4408 MWt

Attachment to GNRO-2012/00113 Page 1 of 8 VIBRATION DATA FOR THE MAIN STEAM LINE PIPING AND SAFETY RELIEF VALVES -

4408 MWt In a letter to the NRC staff1, Entergy Operations, Inc. (Entergy) committed to provide vibration data along with acceptance limits for the main steam line (MSL) piping 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 or near the current licensed thermal power of 4408 MWt (113% of 3898 MWt, the previous licensed thermal power) is provided in Sections I and II, below.

Node 1008 on MSL-A has reported data that contained intermittent high-amplitude spikes.

These types of spikes were not seen in the corresponding data for the other valves at the same valve location (top) nor were they seen in the data at any of the nodes. For these reasons, the data at this location were deemed unusable.

Node 3010 on 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 main steam flow, there was a markedly higher increase in the X (longitudinal), Y (vertical), and Z (lateral) accelerations at Node 3010 on MSL-C. This magnitude increase for Node 3010 is in excess of 2 standard deviations above the response noted for the other 15 SRVs. PSD comparisons were made to the MSL response at SRV monitoring points on two valves at Nodes 1008 and 3010 on MSL-C. The PSD comparison for X, Y, and Z responses shows a large change in frequency response through much of the 1 - 250-Hz 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 valve actuator. It is expected that the mounting straps have loosened and the sensor has shifted. The measured response is most likely being affected by the response of the accelerometer mounting system; therefore, this measured response is unusable.

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 ~4408 MWt.

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.

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 #ML12221A198)

Attachment to GNRO-2012/00113 Page 2 of 8

• Upper Limit - The upper limit frequency should be sufficiently high so 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 1-g 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.

Table 1 ACCEL.

PIPING ACCEL. LIMIT MONITOR POINT MEASURED LEVEL 2 /

DESCRIPTION/ LEVEL 2 / NOTES LOC./DIR. NUM. ACCEL (g) LEVEL 1 SEGMENT LEVEL 1 (g)

MARGIN (%)

Piping associated with B21-F041A Non-Operable X 1X N/A 0.720 / 1.440 N/A (Top of Valve) Sensor MSL-A, Node 1008 Piping associated with B21-F041A Non-Operable Y 1Y N/A 0.160 / 0.320 N/A (Top of Valve) Sensor MSL-A, Node 1008 Piping associated with B21-F041A Non-Operable Z 1Z N/A 0.671 / 1.341 N/A (Top of Valve) Sensor MSL-A, Node 1008 Piping associated with B21-F041A X 2X 0.363 0.447 / 0.893 18.8 / 59.4 Acceptable (Actuator)

MSL-A, Node 1010 Piping associated with B21-F041A Y 2Y 0.157 0.231 / 0.461 32.0 / 65.9 Acceptable (Actuator)

MSL-A, Node 1010 Piping associated with B21-F041A Z 2Z 0.212 0.434 / 0.868 51.2 / 75.6 Acceptable (Actuator)

MSL-A, Node 1010 Piping associated with B21-F051A X 3X 0.200 0.349 / 0.697 42.7 / 71.3 Acceptable (Actuator)

MSL-A, Node 2010 Piping associated with B21-F051A Y 3Y 0.193 0.224 / 0.447 13.8 / 56.8 Acceptable (Actuator)

MSL-A, Node 2010

Attachment to GNRO-2012/00113 Page 3 of 8 ACCEL.

PIPING ACCEL. LIMIT MONITOR POINT MEASURED LEVEL 2 /

DESCRIPTION/ LEVEL 2 / NOTES LOC./DIR. NUM. ACCEL (g) LEVEL 1 SEGMENT LEVEL 1 (g)

MARGIN (%)

Piping associated with B21-F051A Z 3Z 0.248 0.389 / 0.778 36.2 / 68.1 Acceptable (Actuator)

MSL-A, Node 2010 Piping associated with B21-F047A X 4X 0.171 0.420 / 0.840 59.3 / 79.6 Acceptable (Actuator)

MSL-A, Node 4010 Piping associated with B21-F047A Y 4Y 0.031 0.310 / 0.619 90.0 / 95.0 Acceptable (Actuator)

MSL-A, Node 4010 Piping associated with B21-F047A Z 4Z 0.217 0.474 / 0.948 54.2 / 77.1 Acceptable (Actuator)

MSL-A ,Node 4010 Piping associated with B21-F051B X 5X 0.004 0.701 / 1.402 99.4 / 99.7 Acceptable (Top of Valve)

MSL-B, Node 1008 Piping associated with B21-F051B Y 5Y 0.098 0.185 / 0.370 47.0 / 73.5 Acceptable (Top of Valve)

MSL-B, Node 1008 Piping associated with B21-F051B Z 5Z 0.706 0.756 / 1.512 6.6 / 53.3 Acceptable (Top of Valve)

MSL-B, Node 1008 Piping associated with B21-F051F X 6X 0.040 0.389 / 0.778 89.7 / 94.9 Acceptable (Actuator)

MSL-B, Node 3010 Piping associated with B21-F051F Y 6Y 0.093 0.212 / 0.424 56.1 / 78.1 Acceptable (Actuator)

MSL-B, Node 3010 Piping associated with B21-F051F Z 6Z 0.166 0.436 / 0.872 61.9 / 81.0 Acceptable (Actuator)

MSL-B, Node 3010 Piping associated with B21-F041F X 7X 0.254 0.645 / 1.290 60.6 / 80.3 Acceptable (Top of Valve)

MSL-B, Node 4008

Attachment to GNRO-2012/00113 Page 4 of 8 ACCEL.

PIPING ACCEL. LIMIT MONITOR POINT MEASURED LEVEL 2 /

DESCRIPTION/ LEVEL 2 / NOTES LOC./DIR. NUM. ACCEL (g) LEVEL 1 SEGMENT LEVEL 1 (g)

MARGIN (%)

Piping associated with B21-F041F Y 7Y 0.120 0.181 / 0.362 33.7 / 66.9 Acceptable (Top of Valve)

MSL-B, Node 4008 Piping associated with B21-F041F Z 7Z 0.572 0.800 / 1.600 28.5 / 64.3 Acceptable (Top of Valve)

MSL-B, Node 4008 Piping associated with B21-F041K X 8X 0.176 0.663 / 1.326 73.5 / 86.7 Acceptable (Top of Valve)

MSL-B, Node 6008 Piping associated with B21-F041K Y 8Y 0.155 0.229 / 0.457 32.3 / 66.1 Acceptable (Top of Valve)

MSL-B, Node 6008 Piping associated with B21-F041K Z 8Z 0.505 0.677 / 1.353 25.4 / 62.7 Acceptable (Top of Valve)

MSL-B, Node 6008 Piping associated with B21-F041C X 9X 0.218 0.701 / 1.402 68.9 / 84.5 Acceptable (Top of Valve)

MSL-C, Node 1008 Piping associated with B21-F041C Y 9Y 0.127 0.185 / 0.370 31.4 / 65.7 Acceptable (Top of Valve)

MSL-C, Node 1008 Piping associated with B21-F041C Z 9Z 0.156 0.756 / 1.512 79.4 / 89.7 Acceptable (Top of Valve)

MSL-C, Node 1008 Piping associated with B21-F051C Non-Operable X 10AX N/A 0.389 / 0.778 N/A (Actuator) Sensor MSL-C, Node 3010 Piping associated with B21-F051C Non-Operable Y 10AY N/A 0.212 / 0.424 N/A (Actuator) Sensor MSL-C, Node 3010 Piping associated with B21-F051C Non-Operable Z 10AZ N/A 0.436 / 0.872 N/A (Actuator) Sensor MSL-C, Node 3010

Attachment to GNRO-2012/00113 Page 5 of 8 ACCEL.

PIPING ACCEL. LIMIT MONITOR POINT MEASURED LEVEL 2 /

DESCRIPTION/ LEVEL 2 / NOTES LOC./DIR. NUM. ACCEL (g) LEVEL 1 SEGMENT LEVEL 1 (g)

MARGIN (%)

Piping associated with B21-F047G X 10BX 0.565 0.645 / 1.290 12.4 / 56.2 Acceptable (Top of Valve)

MSL-C, Node 4008 Piping associated with B21-F047G Y 10BY 0.046 0.181 / 0.362 74.6 / 87.3 Acceptable (Top of Valve)

MSL-C, Node 4008 Piping associated with B21-F047G Z 10BZ 0.724 0.800 / 1.600 9.5 / 54.8 Acceptable (Top of Valve)

MSL-C, Node 4008 Piping associated with B21-F047L X 10CX 0.540 0.663 / 1.326 18.6 / 59.3 Acceptable (Top of Valve)

MSL-C, Node 6008 Piping associated with B21-F047L Y 10CY 0.221 0.229 / 0.457 3.5 / 51.6 Acceptable (Top of Valve)

MSL-C, Node 6008 Piping associated with B21-F047L Z 10CZ 0.408 0.677 / 1.353 39.7 / 69.8 Acceptable (Top of Valve)

MSL-C, Node 6008 Piping associated with B21-F047D X 10DX 0.304 0.720 / 1.440 57.8 / 78.9 Acceptable (Top of Valve)

MSL-D, Node 1008 Piping associated with B21-F047D Y 10DY 0.143 0.160 / 0.320 10.6 / 55.3 Acceptable (Top of Valve)

MSL-D, Node 1008 Piping associated with B21-F047D Z 10DZ 0.349 0.671 / 1.341 48.0 / 74.0 Acceptable (Top of Valve)

MSL-D, Node 1008 Piping associated with B21-F047D X 10EX 0.432 0.447 / 0.893 3.4 / 51.6 Acceptable (Actuator)

MSL-D, Node 1010 Piping associated with B21-F047D Y 10EY 0.176 0.231 / 0.461 23.8 / 61.8 Acceptable (Actuator)

MSL-D, Node 1010

Attachment to GNRO-2012/00113 Page 6 of 8 ACCEL.

PIPING ACCEL. LIMIT MONITOR POINT MEASURED LEVEL 2 /

DESCRIPTION/ LEVEL 2 / NOTES LOC./DIR. NUM. ACCEL (g) LEVEL 1 SEGMENT LEVEL 1 (g)

MARGIN (%)

Piping associated with B21-F047D Z 10EZ 0.132 0.434 / 0.868 69.6 / 84.8 Acceptable (Actuator)

MSL-D, Node 1010 Piping associated with B21-F014D X 10FX 0.297 0.349 / 0.697 14.9 / 57.4 Acceptable (Actuator)

MSL-D, Node 2010 Piping associated with B21-F014D Y 10FY 0.186 0.224 / 0.447 17.0 / 58.4 Acceptable (Actuator)

MSL-D, Node 2010 Piping associated with B21-F014D Z 10FZ 0.255 0.389 / 0.778 34.4 / 67.2 Acceptable (Actuator)

MSL-D, Node 2010 Piping associated with B21-F051D X 10GX 0.247 0.420 / 0.840 41.2 / 70.6 Acceptable (Actuator)

MSL-D, Node 4010 Piping associated with B21-F051D Y 10GY 0.142 0.310 / 0.619 54.2 / 77.1 Acceptable (Actuator)

MSL-D, Node 4010 Piping associated with B21-F051D Z 10GZ 0.450 0.474 / 0.948 5.1 / 52.5 Acceptable (Actuator)

MSL-D, Node 4010 Piping associated with Pipe Support N11G001H14 X 15X 0.092 0.213 / 0.426 56.8 / 78.4 Acceptable Turbine Bldg.

MSL-D, Node 412 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 ~4408 MWt.

The measured acceleration (ACC. ACTUAL) represents the peak acceleration reported by the tri-axial accelerometer in that particular direction for the individual node. This peak was gathered from the time-history data after band-pass filtering (2 - 250 Hz) and DC-offset removal.

Attachment to GNRO-2012/00113 Page 7 of 8 The methodology for developing the acceleration limits (ACC. LIMIT) below was through analytical methods involving ASME NB-3500 calculations as well as structural sub-models of individual components. For both the top-of-valve and actuator locations, the horizontal limits (X and Z) seen below are a resultant limit calculated through the square root sum of the squares (SRSS) method. The vertical limit (Y) is an individual limit that is not used to calculate any resultant limits.

Table 2 COMP./PIPING MONITOR. PT. MEASURED ACCEL LIMIT MARGIN DESCRIPTION / NOTES LOC./DIR. NUM. ACCEL (g) (g) (%)

SEGMENT B21-F041A X Non-Op Sensor Top of Valve Y 1 N/A N/A N/A Non-Op Sensor MSL-A, Node 1008 Z Non-Op Sensor B21-F041A X 1.20 3.78 68.28 Actuator Y 2 1.09 3.77 71.04 Acceptable MSL-A, Node 1010 Z 1.20 3.78 68.28 B21-F051A X 1.19 3.78 68.47 Actuator Y 3 1.11 3.77 70.49 Acceptable MSL-A, Node 2010 Z 1.19 3.78 68.47 B21-F047A X 0.70 3.78 81.58 Actuator Y 4 0.01 3.77 99.76 Acceptable MSL-A, Node 4010 Z 0.70 3.78 81.58 B21-F051B X 1.32 6.62 80.05 Top of Valve Y 5 2.08 3.42 39.27 Acceptable MSL-B, Node 1008 Z 1.32 6.62 80.05 B21-F051F X 1.57 3.78 58.50 Actuator Y 6 1.20 3.77 68.15 Acceptable MSL-B, Node 3010 Z 1.57 3.78 58.50 B21-F041F X 5.01 6.62 24.29 Top of Valve Y 7 0.12 3.42 96.57 Acceptable MSL-B, Node 4008 Z 5.01 6.62 24.29 B21-F041K X 1.40 6.62 78.80 Top of Valve Y 8 0.72 3.42 79.02 Acceptable MSL-B, Node 6008 Z 1.40 6.62 78.80 B21-F041C X 3.50 6.62 47.18 Top of Valve Y 9 3.27 3.42 4.31 Acceptable MSL-C, Node 1008 Z 3.50 6.62 47.18 B21-F051C X Non-Op Sensor Actuator Y 10a N/A N/A N/A Non-Op Sensor MSL-C, Node 3010 Z Non-Op Sensor B21-F047G X 2.93 6.62 55.71 Top of Valve Y 10b 0.08 3.42 97.81 Acceptable MSL-C, Node 4008 Z 2.93 6.62 55.71

Attachment to GNRO-2012/00113 Page 8 of 8 COMP./PIPING MONITOR. PT. MEASURED ACCEL LIMIT MARGIN DESCRIPTION / NOTES LOC./DIR. NUM. ACCEL (g) (g) (%)

SEGMENT B21-F047L X 1.50 6.62 77.40 Top of Valve Y 10c 0.85 3.42 75.23 Acceptable MSL-C, Node 6008 Z 1.50 6.62 77.40 B21-F047D X 1.43 6.62 78.35 Top of Valve Y 10d 0.76 3.42 77.69 Acceptable MSL-D, Node 1008 Z 1.43 6.62 78.35 B21-F047D X 2.66 3.78 29.63 Actuator Y 10e 1.07 3.77 71.63 Acceptable MSL-D, Node 1010 Z 2.66 3.78 29.63 B21-F041D X 1.33 3.78 64.79 Actuator Y 10f 0.85 3.77 77.57 Acceptable MSL-D, Node 2010 Z 1.33 3.78 64.79 B21-F051D X 1.46 3.78 61.23 Actuator Y 10g 0.59 3.77 84.31 Acceptable MSL-D, Node 4010 Z 1.46 3.78 61.23