ML20234D615

Pipe Vibration Survey Emergency Diesel Generator a Rancho Seco Nuclear Power Plant

ML20234D615
Person / Time
Site:	Rancho Seco
Issue date:	12/31/1986
From:	Bercel E STONE & WEBSTER ENGINEERING CORP.
To:
Shared Package
ML20234D507	List: A11745, Evaluation of DSR-48 Emergency Diesel Generator Crankshafts at Rancho Seco Nuclear Generating Station ML20234D506 ML20234D524 ML20234D615 ML20234D649
References
14850.35-AV2, TAC-63030, NUDOCS 8801070109
Download: ML20234D615 (34)

Text

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Report No. 14850.35-AV2 DEC. 1986 l

.j PIPE VIBRATION SURVEY EMERGENCY DIESEL GENERATOR

'A' RANCHO-SECO NUCLEAR POWER PLANT PREPARED FOR SACRAMENTO MUNICIPAL UTILITY DISTRICT PREPARED BY EUGENE BERCEL STONE & WEBSTER ENGINEERING CORPORATION BOSTON, MASSACHUSETTS 8801070109 871229 PDR ADOCK 05000312 S

PDR

.~

TABLE OF CONTENTS I

Section Title Page Summary and Conclusions 3

1.0 Objectives 4

2.0 Test Equipment 4

2.1 Instrumentation 4

2.2 Calibration 5

2.3 Diesel Generator Data 5

3.0 Measurement and Analysis Procedure 6

4.0 Survey Results 6

APPENDIX 8

TABLE 1 Equipment Frequency Response TABLE 2 Acceleration Measurements 1

FIGURE 1

Instrumentation Schematic FIGURES 2-17 Measurement Locations FIGURES 18-23 Vibration Spectra from Locations 5A, 5B,.50 and 7 I

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SUMMARY

AND CONCLUSIONS A vibration survey was carried-out on'Nov.

'14 1986 at thirty points of-the piping system of the' emergency diesel generator

'A' at the Rancho Seco Nuclear Power' Station.

The diesel. engine involved was.en 8-cylinder V-type engine-(DSR-48). manufactured by Transamerica DeLaval.

The piping locations were: selected by site personnel.

The' objective of the survey was to identify those piping sections that may-he'e potentially high vibration induced stresses.

The measurements were carried out in accordance with a

document issued by. the TDI Owners Group and entitled: " Emergency Diesel Generator Pipe,- Tube and Component Test' Procedure for DSR-48 Engines".

With the engine operating at 3500 -kW, 500 kiUdt load peak' acceleration levels were. measured in the time-domain.

The acceleration signal was low-pass filtered at 200 Hz and a peak--

hold meter was used to measure the peak acceleration levels.- At-those locations where the vibration exceeded 10.0 s's a 1000 Hz low pass-filtered. version of.the vibration signal was recorded on.

magnetic tape for detailed analysis..'At'several locations where it was - desirable and feasible-temporary supports were introduced-and the vibration measurements were repeated.

The location and nature of the temporary supports were recorded by site personnel.

At most. locations the observed acceleration levels were well below 10.0 g's.

At five locations the vibration level exceeded that amplitude.

Frequency analysis of fthe vibration-signals measured at those locations. showed that the large amplitude vibration content occurred at relatively high frequencies and the associated displacement ranged from 2.5 to 8.5 mils pk. based on averaging over a period of 6.4 seconds.

3

L k

c 1.0 OBJECTIVES

.The objective of the survey was to measure the vibration levels at selected locations of the piping system where the piping.or components may be subjected to potentially high vibration induced stresses.

The measurements were to provide sufficient information for an estimate of displacement and stress amplitudes.

2.0 TEST EQUIPMENT 2.1 INSTRUMENTATION The following instrumentation was used in the vibration survey.

Transducer Reference Accelerometer PCB 308B SN 3722 Signal Conditioning / Recording Equipment Peak-hold Meter B & K 2209 SN 434032 7-channel preamplifier Trig-Tek 205B SN 103 4-channel tape recorder Teac R-71 SN 160362

' Accelerometer power supply PCB 480D09 SN 365 Data Analysis Equipment 4-channel tape recorder Teac R-71 SN 160362 2-channel spectrum analyzer Nicolet 660B SN 5620079006 System control computer HP 9826 SN 2205A04469 The instrumentation was interconnected to form the system illustrated schematically in Figure

1. The frequency response characteristics of the individual components and those of the system are tabulated in Table 1.

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t 4

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s 2.2 CALIBRATION The accelerometer used in the survey was calibrated against a precision accelerometer in the Acoustics and Vibration Laboratory of Stone

& Webster Engineering Corporation.

A shaker table,

' swept-sine' excitation and transfer function techniques were used.

The calibration is traceable to NBS.

Prior to the test the functioning of the accelerometer and the associated instrumentation was verified in the field both before and after each baseline survey in the following manner.

The accelerometer was mounted on a fixture back to back with a

velocity probe.

The fixture was then attached to the engine under operating conditions.

Using transfer function measurements on the two vibration signals the calibration of the accelerometer and the associated signal conditioning equipment was verified in terms of the known output of the reference velocity probe.

The overall accuracy of the performed vibration measurements is estimated to be +/- 10 per cent.

2.3 DIESEL GENERATOR DATA Engine Engine Model DSR-48 Serial Number 81015-3057 Bore 17" Stroke 21" Engine Speed 450 rpm Firing Order 1,4,7,3,8,5,2,6 Generator Generator Output 6500 kW, 3-phase 4375 kVA 607.2 Amps.

Service Factor 1.0 l

l l

1 5

_ _ _ _ - _ _ _ __ _ _ O

.:)

3.0 MEASUREMENT AND ANALYSIS PROCEDURE The survey was carried out in accordance with a document issued l

by the TDI Owners Group and entitled:

" Emergency Dicsel Generator Pipe.

Tube and Component Test Procedure for DSR-48 Engines".

Vibration measurements were made at 30 selected points in the piping system with the engine operated at 3500 kW, 500 kVAR l

synchronous load.

The measurement locations are identified in Table 2 and in the schematics shown in Figures 2-through 17.

At-each location measurements were made in as many of the axial (A),

horizontal-(H) and vertical (V) directions as permitted by local-geometry..The measurement axes were mutually perpendicular and the axial direction was parallel to the axis of the crankshaft.

At some locations, as. shown in Table 2 temporary supports were introduced and the measurements were repeated to determine their effectiveness.

All measurements were taken using a hand-held accelerometer..The vibration signal was processed in the manner shown schematically in Figure-1.

It was low pass filtered at 200 Hz and acceleration measurements were taken with a peak-hold meter.

The signal was low pass filtered at 1000 Hz and recordedLon magnetic tape at the locations where the vibration exceeded 10.0 s's. The ' low-pass filters were-used to filter out high frequency content that had insignificant displacement associated with'it.

The magnetic recordings were subsequently processed. in the laboratory with-a dual-channel. Fast. Fourier Transform (FFT) analyzer to obtain acceleration and' displacement amplitudes in terms of.

g's pk.

and mils' pk. respectively. Plots of vibration amplitudes vs.

frequency were prepared in the frequency range of 0-1000 Hz.

4.0 SURVEY RESULTS The acceleration readings are presented in Table 2 along with'the various comments describing the frequency content of the 1000 Hz low pass filtered signal as monitored on the spectrum analyzer at

.the time the peak readings were taken.

At most locations the acceleration levels were much lower than 10.

g's.

The comment

' broad-band' signifies relatively uniformly distributed vibration without prominent peaks.

Where frequency values are given they denote the frequency of the most prominent peaks.

Unless

.otherwise stated the comments apply to all measurements made at a location.

The. vibration spectra at those locations where the acceleration signal exceeded 10 g's are presented in Figures 18 through 23.

6

a The frequency range covered is 0-1000 Hz.

The acceleration and displacement values corresponding to major peaks in those spectra have been tabulated below.

Major Vibration Content at Locations Where Overall Vibration Level Exceeded 10. g's Measurement Frequency Acceleration Displacement Hz g's pk.

mils pk.

5A Axial 52.5 2.18 5A Axial 180.0 7.14 2.14 5A Hor.

50.0 8.30 SA Hor.

180.0 4.91

(

SB Hor.

75.0 3.34 5B Hor.

177.5 8.34 2.59 SC Hor.

75.0 1.89 3.26 7 Hor.

60.0 4.53 7 Hor.

122.5 5.16 3.34 7 Vert.

122.5 13.1 8.48 The amplitudes in the above table represent average values at particular frequency points in the frequency-domain measured over a period of 6.4 seconds.

Therefore, they are considerably lower than the measurements in Table 2

which were instantaneous values captured in the time-domain.

7

4 4

6 e

1 1

APPENDIX I

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TABLE 1

RANCHO SECO NUCLEAR POWER STATION PIPING VIBRATION SURVEY, DG

'A' NOV. 14, 1986

SUMMARY

OF FREQUENCY RESPONSE CHARACTERISTICS Flat Equipment Model Serial No.

Frequency Response, Hz Accelerometer PCB 308B 3772 1-5000 Cal. due'1/24/87 Peak-hold Meter B&K 2209 434032 1-3000 Cal due 4/21/87 Preamplifier Trig-Tek 205B 103 0-100,000 Cal. due 7/23/87 Tape Recorder Teae R-71 160362 0-1250 Cal, due 4/16/87 L

FFT Analyser Nicolet 660B

-5620079006 1-20,000 Cal. due 10/8/86 Overall System Response L

Peak-hold Measurement 1-200 Spectrum Analysis 1-1000 i

i Y-b

. +

TABLE 2 RANCHO SECO NUCLEAR FOWER STATION PIPING VIBRATION SURVEY, DG

'A' NCV. 14, 1796 PE 4.

ACCELERATION MEASUREMENTS CN ASEORTED PIPING LOCATIONS t'essurement An 2 al Hor i: ent al Vertical L.c:ations

's cP.

g's pk.

g's ok.

Comments 1 A 4.00 4.00 Broad band, 170 H: L 375 H:

1 B 3.00 3.00 Broad band, 282 H:

i i C 2.60 2.10 Broad band, 30 H: 6 400 L:

I 1 4 4.00 4.50 With support i B 3.70 4.30 With support 1 C 4.30 2.00 Aith support 1 4 5.10 5.20 Twc supports, broad, 30 H:

1 B 4.00 3.50 Two suoports, bread band 1 C 2.4C-1.70 Two supports 2A 5.50 5.50 Centered around 170 H:

l 2B 3.40 3.50 Broad band. 200 H:

2C 7.50 3.20 100 H:, pure at axial 2A 5.00 5.50 With support 2B 3.50 5.20 With support 2C B.00 4.50 With support i

2A 6.50 6.00 Two suppcrts, B.

band. 200 ~:

23 3.60 4.00 Two supports, broac bane 2C 11,00 2.40 Two supports 3A 3.00 4.00 Broad band arcund 200 H:

3B 1.70 3.00 Broad band arcund 200 H:

3A 3.50 3.60 With support 3B 2.c0 3.70 With support A A 2.20 1.30 Broad band 5a 12.00 12.00 B.

band arcund 50 S 180 H:

5B 20.00 75 H: & 180 H:

5C 14.00 75 H: & 180 H:

6 1.20 2.50 4.60 Broad bard arcend 180 H:

7 10.00 16.00 122.5 H:, pure at vert::a1 8

5.00 5.40 122.5 H: vert., 62.5 H: ;x el 9 A 1.00 4.40 7.50 30 Hz, 41 H:

9A 1.50 5.00 1.50 With suapert 10 2.30 2.30 2.30 30 H: almost pure 11 2.90 4.40 2.60 30 H: almcst pure 12 A

!.40 7.00 30 H:

12 B 3.70 1.40 30 H:

12 C 3.00 1.20 30 H:

12 A 3.50 2.50 With suppcrt 12 B 4.00 1.60 With support 12 C 3.20 1.40 With suppert 13 4 1.60 1.70 1.7 B 5.40 B-cad Land around 200 H:

13 C T.30 5.00 B.

band arcund 60 L 200 m:

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• TABLE 2 (CONT'D)

RANCHO SECO NUCLEAR PCWER STATION PIPING VIBRATION SURVEV, DG

'A' NOV.

14, 1036 PEAK ACCELESATICN MEASUREMENTS ON ASSORTED PIPING LOCATIONS Measureme,t Quial Horizontal Vertical L::sttens g's pk.

g's pk.

g's pk.

Ccmments in A 2.10 4.00 14 9 3.20 3.50 30, 210, 270 % 420 H:

14 C 3.00 3.50 30 H: & 420 H:

15 A 3.00 2.00 Without support 15 B

!.60 3.60 Without support 15 4 1.20 1.50 With support 15 B 2.00 2.00 With support 16 A 3.50 4.00 30 H:

l m mm

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SIGNAL CONDITIONER PCB 480D 60' OSCILLOSCOPE BALLENTINE 1022A

[

TRIG-TEK' 205B ACCELEROMETER PCB 308B-i 1000 Hz L.P.

200 Hz L.P.

FILTER FILTER ROCKLAND 432 ROCKLAND 432 PEAK-HOLD liETER B&K 2209 ACCELEROMETER _

CALIBRATION '

FM TAPE RECORDER TEAC R-71 SIGNAL MONITOR /

ANALYZER NICOLET 660B PIPING SURVEY INSTRUMENTATION SCHEMATIC FIGURE 1

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