ML20235F060

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Vibration Test Summary Rept
ML20235F060
Person / Time
Site: Monticello, 05000000
Issue date: 06/12/1972
From:
NORTHERN STATES POWER CO.
To:
Shared Package
ML20235B311 List: ... further results
References
FOIA-87-111 NUDOCS 8709280393
Download: ML20235F060 (44)
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MONTICELID VIBRATION TEST S'JMMARY REPORT June 12, 1972 Vibration measurements were made on the reacter internals at

& nticello starting 12/22/70 with cold flow tests and being completed 7/6/71 with the turbine trip test f:om 100% power, 100% coolant flow. This is a surnary report cf the measure-ments, listing the measured amplitudes, criteria and with a discussion and evaluation of the significance of the results.

The results of these measurements and tests irdicate that

, 'vib' ration amplitudes are all within acceptable limits for normal operation up to 100% power and 100% flev. Se high-est levels of vibration occurred on the jet p .p riser pipes during transient and unbalanced flow conditions. Jet pumps were cavitating during the cold recirculation pump trip tests. Automatic interlocks nomally prevent operation above 20% pump speed in the cold condition; the pum; trip tests were done from 65% pump speed and therefore resulted in vibration

, levels significantly higher than expected during normal oper-ation. Even though vibzstion' levels were less than the ac-ceptance criteria for unbalanced flow conditions, procedural controls have been established to further redu:e these '_evels.

he "Results - Summary and Discussion", Sectics I, covers in detail the maximum vibrations measured in each section of the reactor listing the maximum amplitudes both in terms of inches peak to peak motion and the percent this amplitude is of the criterion. Se detailed tabulation of the criteria and the measurements is given in Section II, " Criteria and Measuze-ments". Sections III and IV are a tabulation of raw data included in the complete test record; these sections are not included as part of the summary report.Section V, " Vibration Instrumentation", discusses the type and location of sensors and associated instmmentation.

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L Roeults - Summe and Discussion

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1. Shroud-Separator Assembly Vibration Measurements The maximum vibration motions of the shroud-separator assembly for all steady operating conditions, with both balanced and unbalanced flow, were 0.001" peak to peak at 6. to 7. Hz and .0006" peak to peak at 14.8 Hz. These represent 1. 8% and 3.2% of the respective criterion.

The highest vibration amplitudes are related to the opening of a i pressure relief valve and to scram when operating at and above 50%

power. This vibration was very transient in nature, never lasting more than 1. to 1. 5 seconds. The maximum transient amplitudes measured were-as follows:

Amplitude Vibration j Peak to Peak Frequency  % Criteria '

2 Pump Trip .0012" 5.'5 Hz ' 2. 2%

.0025 15. 13.1 Turbine Trip .005 5. 6 9.1

.0065 15' 34

2. Jet Pump Riser Pipe Vibration Motion (Tangential)

Vibration Vibration  % of Steady State Amplitude Frequency Criteria Constant Flow, Cold Balanced Flow . 004" p.p. 25 Hz 50%

Unbalanced Flow .0066 25 83.(1) (4)

Constant Flow, Hot Balanced Flow .004 25 Hz 25 Unbalanced Flow .008 23.5 91 (1)

Transient Flow-

"A" Pump Trip, Cold .009 26 112 (2) (4)

Hot .008 24.8 100 (2) (3)

"B" Pump Trip, Cold

.012 25 150 (2) (4)

Hot .0035 31.5 25 Turbine Trip , .004 26.8 53 .(2 )

(1) Procedural limitation will forbid operation with the unbalanced flow established for these test points.

(2) The amplitudes measured occurred for less than 1.5 seconds. ,

(3) This reading occurred during "A" pump coastdown when unbalanced flow passed through critical region (see Note 1). a l

1 { e} t Pumps cavitated under these conditions and this mode is not permitted j

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3. Jet Pump Vibration Motion (Radial, at the Top)

Vibration Vibration

. Amplitude Frequency % Criteria Constant Flow, Cold Balanced Flow . 004" p. p. 36 Hz 30%

Unbalanced Flow .003 24 17 Constant Flow, Hot .

Balanced Flow .0015 24.8 6 Unbalanced Flow .005 24.8 20 Transient Flow "A" Pump Trip, Cold .012 32 47 Turbine Trip .005 .36 37 For each main heading in the above table, the readings listed represent the maximum amplitudes observed. The cold readings also represent operation during initial cavitation which is normally avoided.

The amplitudes listed for transient conditions last only 1. to 2. seconds.

4. In-Core Guide Tube Housing Vibration Motion The maximum vibtation amplitudes of the in-core guide tube housing occurred during the cold unbalanced flow test. This amplitude was 0.0098" peak to peak at 45 Hz which is 19% cf the criterion. During the hot flow tests, the amplitude never exceeded 6.6% of the criterion.
5. Control Rod Guide Tubes The maximum vibration strain amplitude occurred during unbalanced cold flow operation. The amplitude was 69. micro strain peak to peak at 19 Hz which is 9% of the criterion. All readings during the hot flow tests were below 1% of the criterion.

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' II. Criteria and Measurements The vibration criteria and the measurements for each of the five

. sections or components in the reactor are both tabulated in tables with the following five headings:

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. Table 1 - Shroud and Separator Assembly Vibration Amplitudes l' Table 2 - Jet Pump Riser Pipe Tangential Vibration Motion Table 3 Jet Pump ~(Top) Vibration Motion (Radial)  ;

Table 4 - Incore Guide Tube Housing Vibration Motion l

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Table 5 - Control Rod Guide Tube Vibration Motion l Each table is composed of two parts, with the first part titled "A-CRITERIA", and the second part, "B-MEASURED VIBRATION AMPLITUD ES". The source and the significance of the information given in each part is discussed in the following paragraphs: I l

l A-CRITERIA l l

The criteria listed in' the following tables represents the vibration amplitude at the sensor location for a limiting stress at the point of maximum stress in j j

the reactor internals structure.  !

In order to provide assurance that the limiting stress criteria which are established as an acceptance basis for the vibration tests are conservative, the ASME Code design values for endurance limit are used as a guide. The 1968 I edition of the ASME Nuclear Vessel Code establishes the endurance limit as -

"two times the Sa value at 106 cycles in the applicable fatigue curve. " For austenitic materials, such as the stainless steel and inconel from which BWR i internals are constructed, the design Sa value at 106 cycles is 26,000 psi. j j

Therefore, the code would permit a vibration stress of f 26,000 psi which I

corresponds to a design endurance limit of 52,000 psi.

I The procedures and criteria applied in evaluating the acceptability of vibration of BWR reactor internals are based on engineering judgment where more j specific information is lacking, and are more conservative than requirements j-of the ASME Code for Nuclear Vessels. The criteria used in the General Electric BWRs is to limit the alternating peak stress intensity, including all stress concentration factors, to a value of f 10,000 psi. This is assumed to be a conservative criterion and represents an additional margin of safety compared to the value permitted by ASME Codes.

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The relationship between the vibration amplitude at the sensor location and the stress at the point of maximum stress is determined analytically for normal mode response amplitudes and stresses. Where'a more detailed analysis is needed, the normal mode responses are combined to take into l account non-model force inputs (i. e. , input forces at one and two coordinate l locations only). '

The normal mode calculations, in general, involve the following steps:

When computer programs are used, the steps are often combined in the program so that only the problem statement steps 1 and 2 require detailed eifort.

(1) Express the reactor internals structure as a mathematical model in terms of lumped masses and inertias, and lumped springs with coordinate identifications assigned to each.

(2) Calculate the stiffness and the mass matrices. The mass matrix should include the effect of the water in the vessel which will add hydrodynamic masses to many coordinates and will add off diagonal mars terms to the matrix.

(3) Calculate the natural frequencies (eigen values) and the corresponding normal modes (eigen vectors).

(4) For each normal mode determine the location of the limiting stress.

(5) From the normal mode and limiting stress calculations, determine the limiting vibration amplitude at the sensor locations.

B-MEASUREMENTS The data for the vibration measurements were recorded on three 6-channel chart recorders and a 14-channel tape recorder. Detailed characteristics of the instrumentation are given in Section V.

The measured values reported in the following five tables were taken from the chart recordings using a purely manual procedure aided by a Gerber Variable Scale. In general, when the vibration amplitudes were fairly low (i. e. , less than 10% of the criterion), both the amplitude and the frequency tended to be random. When the amplitudes were higher single frequency, components tended to predominate. The vibration amplitudes listed repre-sent the largest peak to peak value observed during the recording period (nr.ually for twenty seconds or more), and the frequency (Hz ) for dach amplitude reading, i

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Table 1 - Shroud and Separator Assembly Vibration Amplitudes

'A. CRITERIA l

Vibration ' Limiting Vibration Amplitude Frequency (inches peak to peak) Critical Stress Location Sensors Sensors D-1,2,3,4 V -1, 2, 3, 4

' 4 .' 1 0.055" 0.103" Shroud legs 6.6 0.055 0.110 Shroud legs

7. 9 - 0.062 0.029 Shroud legs 13.6 .0.019 0.209 Shroud legs
17. 4 0.~ 0024 0.048 Fuel 19.7- 0.0072 0.082 Standpipes 20.8 0.013 .O.074 Standpipes 23.1 0.024 0.012 Shroud legs 35.8 0.006 - 0.0062 Fuel 40.3' O.024 0.031- ~ Standpipes 1 43.2 0.062 0.038 Standpipes l 1

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f- Table 1 (cont'd) II-4 B. MEASURED VIBRATION AMPLITUDES l

Power  % Pump Speeds Maximum Vibration Amplitudes A B (inches peak to peak)

Elevation 387" Elevation 532" (D-1, 2, 3, 4) (V-1, 2, 3, 4)

A f A f Balanced Flow Operation Cold 65% 65% .001" 4. 8 Hz .001" 24 Hz l

.001 29.8 1 50% Power 81 83 .0007 4. 7 -6. 5 < . 00 01 -

75% Power 86 87 .0008 6.6 < .0001 -

53.5 53 .0003 6.0 < . 0001 )

.0003 16.0 24.5 22.5 .0005 5. 5 < . 0001 100% Power 92 91 .001 6.2 < .0001 -

.0006 14.8 Unbalanced Flow Operation Cold 20 50 .001 5 .0005 25 9 65 .001 5 .001 25 60 40 .0005 25 .001 25 50% Power 0 83 .0005 5.75 < . 0001 -

81 0 .0005 5.75 < . 0001 -

75% Power 0 93 .001 6. -7. < . 0001 -

100% Power 28 94 .0005 6. 2 < . 0001 -

.0002 15.5 91 24 /27. .0004/ 6 < . 0001 -

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.0006 l

.0005 15 Equalizer Valves en l I

Cold 60 0 .0003 5 < 0001 '

50% Power 79 0 .0003 6 0 87 .0003 6 l 100% Power 86 0 .0005 6

.0002 15 1

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Tabic l (cont'd) II- 5 i

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A - Pump Trip and B - Pump Trip Cold ' [ Vibration amplitudes changed gradually from.

50% Power y those for two pump operation to those for 75 i single pump operation.

100.

Two Pump Trip 50% Power 33 36 .0008 5.6 < .0001 11 15 .0025 15.2 75 - -

.0012* . 5.5

.006* 15.5 100 91 94 , .0008 6

.0008 15 10 -16 .0007 6 0 0 .001 6 Turbine Trip ,

50% Power .0064** 15 -

75 ' .005 5. 6

.0065 15 100- .005* 4.6

.0035** 5. 8 l

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    • Main pressure relief valve was operated.

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II- 6 Table 2 - Jet Pump Riser Pipe Tangential Vibration Motion l

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A. CRITERIA Limitating Vibrr. tion Amplitude Vibration (inches peak to peak)

Frequency Sensors D-5, D-6 24 0.0088" 26 0.008 ,

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28 0.0075 29 O.0084 _ _ _

30 0.0116 31 0.0142 32 0.0132 34 0.0116 36 0.0113 ,..

0.0108 40 .

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Tabic 2 (cont'd)

-B. MEASURED VIBRATION AMPLITUDES Maximum Vibration Amplitudes Power  % Pump Speeds (inches peak to peak)

A B -

Riser at-30' Riser at 330' (Sensor D-5) (Sensor D-6)

A f A f

' Balanced Flow Operation Cold 40 40 .0004 27 .0001 62.5 65 65. .0001 25 .004* 21

.004 25 .004* 30 50% Power 52 52 .0015 29.5 .0006 29 62 62 .001 31 .0008 27 70 70; .001 30 .001 26 75 75 .0008 -

.0012 -

81 83 .001 31 .0012 25 l 90 90 .0008 31 .002 24.5'  !

75% Power 88 89 .,0005 31 .002 25.2 53 54 .0008 31 .0005 28.5 20 20 .0003 30.5

.100% Power 92 91 .0012 31.5 .002 25 74 .76.5 .001 31 .0005 27 Unbalanced Flow Operation Cold 65 50 .002 25-29 .005* 25 65 40 .002 25-29 .0074* 25 1 60 40 .002 26 .0066* 25 0 40 .0005 25 .0005 25 i 50% Power 82 22 .002 30 .0015 28 .

25 87 .0018 31 .006 25 75% Power 0 89 .001 31 .002 24 0 93 .002 31 .0022 26 100% Power 50 94 .0006 26 .0005 26 40 94 .001 26 .002 26

.0007 31 32 94 .0007 31 .005 25.7 28- 94 . 001 32.5 .007 24.5 i 25 94 .0008 31 .008 23.5 '

23- 94 .0006 30.2 .003 25.5 91 42 .001 32 .002 25  ;

91. 37 .002 32 .002 25 l 91 30 .0035 31.5 .002 25.5 91 27 .004 30 .0025 25 j 91 24 .0022 31 .0016 25.2 l 87 0 .001 30.5 .0015 28  !

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Tabic 2 (cont'd) II-8 r

J Equalizer Valves Open Cold 70 0 .0008 25 .001 25 50% Power - 80. 0 .0004 31 .0004 29 0 82 .0004 31 '0004

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100% Power 84 0 .0006 30.6 .0005 28 1 A - Pump Trip Maximum Readings I

Cold

  • 9 65 .009 26 .004 30

. 50% Power 87 87 .0015 31 .0065 25 75% Power 26 89 .0008 30 .005 24 14.6 88.5 .0015 31 0005 24 100% Power 92.5 96 ' .001' 30.5 .0015 24.7 30- 95 .001 31.6 .008** 24.8 0 94 .0012 29 .002 27.5 B - Pump Trip Maximum Readings Cold

  • 65 0 003 30 .012 25 50% Power 87 87 .0025 31 .001 26
      • .003 *** .0025 ***

75% Power ***

100% Power 92 94 .0014 31 .0021 26.5 91 28 .0035 31.5 .0013 26 91 23 .001 31 .002 25.5 1 91 16 .0005 - r0024 25.5 Two Pump Trip Maximum Readings 1 50% Power 87 87. .0018 32.5 .002 26 75% Power **** **** .001 33 .0008 33 100% Power Gradual Reduction in Amplitudes Turb'ine Trip Maximum Vibration Readings 50% Power 87 87 .0018 32.5 .002 26 75% Power 87.4 87.4 .0035 33 .004 26.8 l 44.5 44.0 .001 33 .0015 26.8 12.4 13.1 .001 33 .001 26.8 100% Power 92 96 .001 28.3 .0015 25.1 .

91.5 94.5 .004***30.5 .003*** 25.2 57.0 59.5 .0006 29.5 .001 29.5 25.0 28.0 .0001 - .0002 -

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Generator-Trip Maximum Vibration Readings, 81 83 .001 30.5 .0015 25 50% Power .

.. Cavitation Search at 100% Flow .

As power was reduced to 20%, no increase in riser pipe vibration amplitude was noted..

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  • Jet pumps were cavitating during these measurements..
    • Maximum during "A" pump coastdown due to unbalanced flow. Occurred for approximately one second. l
      • The recorder chart speed was too slow to define the frequencies.
        • These readings were obtained when the control rods scrar.nmed.

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. Table 3 - Jet 1hamp (Top) Vibration Motion (Radial)

A - CRITERIA -

j' Limiting Vibration Amplitude

. Vibration ^ (inches peak to peak)

F:equency- (Sensors D-7, D-8) 28 .0248" 30 .0262 32 .0256

.0232 34 36 .0134-38 .0076 40 .0062 42 .0092 43 .0156 6

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ti abin ,j, (c o nt 'd ) II- l l B - MEASIIRED VIDRATION AMPLITUDES ,

Power  % Pump Speed Maximum Vibration Amplitudes A B (inches peak to peak)

JP-1 (21.*) JP-2 (39')

, (Sensor D-7) (Sensor D-8)

A f A f Balanced Flow Operation-Cold 65% 65% .004 36 .004 36 50% Power 90 '90 .001 - .0015 28 J 81 83 .0003 31 .0005 31 70 70 .0006 28 .0008 28 62 62 .0006 34 .0008 34 52 52 .0004 29.5 .0004 31.5 30 30 .0001 27.5 .0001 27.5 75% Power 89 89 .0005 - .0005 -

53 54 .0005 28.5 .0007 28.5 20 20 .0001 29 .0001 29 100% Power 92 91 .001 30 .001 30 74 76.5 .0004 29 .0005 29 Unbalanced Flow Operation Cold 65 50 .0008 31.4 .001 31.5 65 40 .003 29.4 .004 25-31.2 60 40 .0026 30 .003 30 0 40 .0005 25 .0005 25 50% Power 82 ~ 22 .005 28 .004 28 25.4 87 .001 28 .0015 28 75% Power 0 89 .002 28.8 .0025 28,8 0 93 .0015 29.4 .005 29.4 100% Power 40 94 .001 29 .001 29 34.1 94 .001 29 .001 29 29.4 94 .0015 29 .002 29 25 94 .0015 29 .0015 29 23 94 .002 29 .0025 29 91 51 .0005 29 .0006 29 91 40 .001 29 .0015 29 91 35 .003 28.5 .004 28.5

.001 40 .001 40 91 30 .004 28.7 .0055 28.7

.0025 38.5 .0035 38.5

,9' 26 .005 28 .005 28 i 91 24.5 .003 29 .004 29 91 22 .001 29 .0008 29

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II- I 2 Table 3 (cont'd)

Equalizer Valves Open Cold 60 0 .00025 25 .0005 25 70 0 .0005 22 .00075 22 50% Power 80 0 .0004 29 .0005 29 0 82 .0004 29 .0005 29 100% Power 85 0 .0003 29 .0005 29 A - Pump Trip Maximum Readings Cold 9 65 .010 32 .0126 32 50% Power 82 86 .0025 28 .003 28 75% Power 0 89 .002 28.8 .0025 28.8 100% Power 92.5 96 .0015 28.8 .0015 28.8 30 95 .0015 29 .0015 29 0 94 .0015 27.7 .002 27.7 B - Pump Trip Maximum Readings Cold 65 65 .0022 31 .001 28 65 0 .0025 34 .003 32 50% Power 82 86 .0025 28,5 .003 28.5 75% Power * * .0045 * .006

  • 100% Power 92 94.5 .0015 29 .0015 29 l

91 28 .0045 29 .0055 29 91 23 .0005 29- .0007 29 91 16 .0005 29 .0007 29 Two Pump Trip Maximum Vibration Readings 50% Power 82 86 .0015 28 .0015 28 75% Power * * .0025* 35 .0025* 35 100% Power Gradual Reduction in Vibration Amplitudes Turbine Trip Maximum Vibration Readings 50% Power .0035** 40 .0035** 40 75% Power 88 91 .0045 46 .003 46 56,0 61 .0015 46 .00'2 46 12 14 .001 46 .001 46 100% Power 91.5 94.5 .005 36 .004 36 57 59.5 .001 30 .002 30 25 28- -

.0002 - .0002 -

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d II-13 Tabic 3 (cont'd) .

4 Generator Trip Maximum Vibration Readings ,

i 50%' Power. 81 83 .0005 29 .0006 29 Cavitation Search at 100% Flow i

As power was reduced to 20%, no increase in jet pump vibration amplitude

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  • Chart speed too slow to define the frequency.

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A - CRITERIA Lirniting Vibration Amplitude Support at Vibration (inches peak to peak) Center or Frequency Sensors A-1,2,3,4 Grid Location 6.5 0.164 No 19.5 0.081 Yes 21.1 0.101 -

No 38.5 0.054 No .j 43.8 0.053 Yes 59 0.010 No 72.4 0.022 Yes l

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B - - MEASURED V1BRATION AMPLITU_ DES _

Conditions  % Pump' Speed Maximum Vibration Amplitudes A B (inches peak to peak)

Location 44,13 and (20, 05)* --

Sensor A3 Sensor A4 A- f A F Balanced Flow Operation Cc;d. 65 65 (.009) (27. 6)* , . G ; s 5 ', (45.5)

(.0065). (48. 3) (.0085) (48. 3)

.002 49 .007 44.5 50% Power 90 '90 .003 9 .003 9

.0005 49.5 .0006 49.5 81 83 .0018 9 .0015. 9

. 0004 49 .0005 49 70 70 .0015 9 .001 9

.0004' 49 .0004 49 62 62 .0015 9 .0008 9 52 52 .0012 9 .0005 9 30 30 .001 9 .009 9 75% Power 88 89 .0005 48 .0005 48 53 54 .001 17 .0005 17 l

-20 20 .001 9 - -

100% Power 92 94 .0006 45.9 .0003 '45.9 ,

74 76.5 .0001 45 .0001 45 Unbalanced Flow Operation Cold 65 50 (.008) (27.4)

(.0054) (49. ) (.008) (49. )

. .001 45 .006 45 i

(. 0185) (27. -34. ) (.004) (45. ) i 60 40 .0019 45 .0098 45 )

65 40 (.009) (28. 2 ) (.004) (49)

.0006 44 .004 44

.0005 49 .003 49 50% Power 82 ,

25 .002 8.25 .0025 -S.25

.001 17.3 .001 17.3

.0002 41 .0005 41 82 30 .0002 8.25 .0005 6.25

. .0002 41 .0001 41 75% Power 0 89 .0025 44 .001 44 0 93 .0035 44 .0015 44 i

Table,4_ (c on t 'd ) II- 16  !

100% Power' 52 94' '

.0007 45 .0002 45 40- '94 .0015 45 .0002 45 r

38.5 94' .0023 45 .0003 45 32 94 .0017 45 .0003 45 29.5 94 .0015 45 .0003 45 28 94 .001 45 .0003 45 23 94 .0021 45 .0005 45 91 51 .0005 9

.0001 45 .0005 45

. 9.1 34 .0015 9 .0006 9

.0001 45 .0001- 45 92 28 .00015 9 .0003 9

.0001 45 .0001 45 91 24.5 .0003 45 .0003 45 Ecualizer Valves Open Cold 70 0 (.00098)(37) (.00073) (38).

(.00073) (45)

.00049 30 50% Power 77 0 All amplitudes were less than for one pump 0 82 operation with valves closed.

100% Power 86 0. .0002 9

.0001 45 .0001 45 A - Pump Trip Maximum Vibration Readings Cold No data available 50% Power 83. 87 .002 47 .0015 47

. 75% Power 86.5 89 .0005 44 .0003 44 i 18 89 .0023 44 .0012 44 0 89 .0025 44 .001 44 100% Power 93 96 .0006 45.9 .0003 45.9 ,

42 96 .0018 45.9 .0005 45.9 j 25 96 .002 45.9 .0008 45.9 B - Pump Trip Maximum Vibration Readings ]

1 Cold 65 65 .007 48 .002 45 i

.007 18  !

65 0 50% Power 87* 87 .002 8.6 .002 8.6  ;

.0003 46 .0008 46 1 d

75% Power No data available 100% Power 92 94.5 .0006 45 .0003 45 91 28 .0007 9 .0001 9

.0001 45 .0001 45 j 91 23 .0006 9 .0001 9

.0002 45 .0002 45 .

91 16.5 .0015 9 .0002 9 d maw > as asav a i

, Tabic 4 (cont'd) II-17 1

Two Pump Trip Maximum Vibration Readings 50% Power 83 88 .0005 49 .0005 49 80 83 .0002 49 .0002 49 '

51' 53.5 .0001 49 .0001 49 75% Power 88 90 .0004 49 .0003 49 75 76 .0002 49 .0002 49 48 52.5 .0001 49 .0001 49 0 4 .0002** 49 .0004** 49 100% Power 91 94 .0005 9 .0005 9

,0002 45 .0001 45 0 0 .0003 9 .0002 9 Turbine Trip Maximum Vibration Readings 50% Power 82.5 83 .0015 9 .001 9

.0007 45 .0005 45 31 33 .001 9 .0005 9

< . 0001 45 < . 0001 45 75% Power 86 86 .0017 9 .0015 9

.0004 45 .0002 45 58 61 .0001 45 .0002 22.5

.0001 45 0 0 < . 0 001. 9.-45. < . 0001 9. -4 5.

100% Power 93. 5 97 .0003 25 < . 0001 25

.0002 45 < . 0001 45 91 88 .0006 9 .0003 9

.0002 45 < . 0001 45 40 43 .0005 9 .0003 9

.0003 45 < .0001 45 (

Generator Trip Maximum Vibration Readings 50% Power 85 86 .002 9 .002 9

.0005 45 .0007 29 The vibration amplitudes did not change with the trip since the pump speed stayed constant.

  • All data within ( ) were obtained from sensors A-1 and A-2 These sensors failed before any hot data were obtained.
    • These readings were obtained during scram.

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Table 5 - Control Rod Guide Tubes A - CRITERIA - -

Limiting Vibration Strain Vibration (micro-strain peak to peak)

Frequency Strain Gages S-1,2,3,4 Critical Stress Location 13.6 100 Shroud legs 19.8 110 Standpipes -

20.8 190 Standpipes 23.1 .

468 Shroud legs  !

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20.0* 780 Center of guide tube

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  • This mode is for case where guide tubes only vibrate in which case sensors D-1, 2, 3, 4 and V-1, 2, 3, 4 would indicate very low readings.

Other frequencies listed are for the case where all tubes vibrate together.  !

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II~ I 9 Table 5 (cont'd)

B - MEASURED VIBRATION AMPLITUDES i Condition .% Pump Speeds Maximum Vibration Strain Amplitudes A B (micro-strain peak to peak)  !

Location 10, 43 Location 02, 23 SG-1 SG-2 SG -3 SG-4 pc f uc i pc f pc f Hz Hz Hz Hz Cold Flow Operation Balanced 65% 65% 9. 2 21 7.5 21 3. 0 20 5. 0 20 ,

9.2 21 14.0 21 9.2 18,5 34.2 18.5 f Unbalanced 65 40 6.0 28 10 25 - - - -

65 0 14.0 20 20 21 6 19 68.8 19 9 65 6. 0 22 16.0 22 - - 17.2- -

A - Pump Trip '

. Amplitudes changed gradually from the a anced to unbalanced abon.

B - Pump Trip i Power Operation For all operating conditions at 50%, 75% and 100% operation, the recorded strain amplitudes were ail less than 3 pc and the predominant frequencies were above 60 Hz. No signals in the frequency range 20 --* 30 Hz were observed.

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Section. III and Section IV are not included in the suunary report.

These sections are a tabulation of the raw test data summarized earlier.

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V-1 l

l SECTION V INTRODUCTION All of the vibration measuring systems used were composed of a vibration transducer, a signal conditioning unit, a magnetic tape recorder and a chart recorder for monitoring readout. As usually employed, this system had an overall sensitivity of 0. 0005" for 1. 0 mm (smallest division) on the chart recorder and . 010" for one volt into the tape recorder. The strain gage read-out had a sensitivity of 5 ue per division (1. 0 mm). The overall sensitivity of each system could be increased by a factor of from 2 to 10 depending upon the electrical background noise.

Table V-1 and drawings 761E260 (sheets 1 and 2) indicate the location and measurement direction of each of the vibration transducers or sensors used.

The following sections give a detailed description of the four measurement systems and their components.

V-2 A-1 DISPLACEMENT TRANSDUCER The sensing element in the displacement transducer is a linear variable differential transformer (LVDT). The LVDT consists of a three-coil assembly with the coils wound side by side on a hollow spool. The center coil or primary winding is energized by a 5-volt 3KHz power supply to provide a I

continuous A-C magnetic field. The two outside or secondary windings are connected in opposing series so that the voltage induced in one' coil tends to cancel that from the other. A magnetic armature is guided in the hollow l spool, and its position relative to the three coils determines the voltages in the two outside coils. When the armature position is such that equal voltage are generated in the outside coils, the net output voltage is zero, and the armature is located at the electro-mechanical null position. See Fig. V-1 for a schematic diagram of the LVDT. The armature of the LVDT is connected to a spring loaded probe follower. As the probe is moved with respect to the case, the net output is proportional to the probe position (displacement). Fig. V-1 shows a cross-sectional sketch of the displacement transduc er.

This transducer is a relative motion sensing unit and usually mounted so the probe is against a relatively non-vibrating structure, and the coil assembly is mounted on the vibrating structure (e. g. , vessel wall to shroud). The probe tip is initially set so the LVDT is in its electro-mechanical null position. The LVDT is designed so the probe can move 0. 20" in either direction from the null position and remain in the linear range of the transformer.

Although the LVDT is adjusted to its null position when mounted, by the time it is to be used, temperature changes have caused expansions and contractions which change the relative position of the vibrating and non-vibrating surfaces.

The inaccessibility of the LVDT makes a mechanical adjustment of the electro-mechanical null position impossible; thus it is necessary to have an external method of " nulling" the LVDT electrical output so that the signal conditioning and readout equipment will remain on scale. This null adjust-ment of the LVDT electrical output is handled by a specially-built unit called the " balance box", the output of which becomes the input to the demodulator.

For a block diagram of the complete signal conditioning system, see Fig. V-2.

The balance box can be switched so as to apply a calibration signal to the demodulator.

The demodulator unit is Validyne Engineering Corp. Mode CD-19, which is plugged into a module case containing an oscillator that produces the 3KHz carrier excitation signal for the LVDT and the DC power for the CD-19.

The demodulator converts the modulated 3KHz signal from the LVDT into a voltage proportional to the armature position, and at the modulation frequency.

The CD 19 output goes through a specially-built switching unit to the tape recorder and the chart recorder. The switching unit makes it possible to Pl ay the tape recorder back to the chart recorder.

g V-3 b The overall response characteristics of each component in the displacement rneasuring system is listed in Table V-2 for each of the components indicated by the block diagram in Fig. V-2.

O l

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.V- 4 TABLE V-1 Sensor Locations and O'rientation Sensor Location Orientation Elevation ' Azimuth s

D1 ' Shroud to vessel . Tangential 386.50 120"

.D2 . Shroud to vessel Tangential 386.'50.. 30' D3 Shroud to vessel Tangential ' 386.50- 300*

,D4 Shroind to Vessel Radial 386.50. '297* 30'

,D5 JP riser top to shroud Tangential 339.25 30" (JPI,2).

D6 JP riser top to shroud Tangential 339.25 330 * (JP19,7.0:

D7- JP1 cibow to vessel Radial 334.00 21*

. D8- JP2 cibow to vessel Radial 334.00- 39*

VI- Upper bolt guide ring Tangential ,

531.83 224*

V2 Upper bolt guide ring Tangential 531.83 314*

V3 Upper bolt guide ring- Tangential - 531.83 134' V4 ' Upper bolt guide ring Tangential 531.83 44* l 4

SG1 CRD guide tube X10-Y43 122.00 .

45 ' within -

tube SG2 CRD guide tube X10-Y43 122.00 315 ' within  ;

tube SG3 CRD guide tube X02-Y23 122.00 225' within tube SG4 CRD guide tube X02-Y23 122.00 135 ' within (

g tube Al In-core guide tube X20-Y05 Tan. 70.00 315' within tube )

A2 In-core' guide tube X20-YO5 Rad. 70.00 45 ' within

. tube A3 In-core guide tube X44-Y13 Rad. 70.00 315 ' within tube A4 In-core guide tube X44 Y13 Tan. 70.00 45 ' within J tube

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'A-2 V ELOCJTY SENSOR i

.The velocity-type vioration sens'or used was a seismic self-generating j unit whose output voltage was proportional to the linear velocity of the '

surface upon which it was mounted. '

This sensor is basically 'a coil of wire that vibrates in a magnetic field in a direction that is at right angles to the magnetic flux lines. The coil' of

~

v ire is mounted on a weighted spring-supported arm, which is free to ,

vibrate around a pivot at the opposite end. When.the frequency of vibration  !

is higher than the natural resonance of the suspended system (spring,-

arm and coil), the suspended syst em . essentially remains in an undistrubed po sition. Thus, relative motion (velocity) between the stationary coil and the moving magnetic field causes a voltage to be generated in the coil.

The output voltage from the sensor is amplified and integrated by a Validyne linear amplifier and integrator (Model AM-49), which makes the output proportional to displacement as shown in the block diagram in Figure V-3. This integrated signal goes through a specially-designed switching circuit to a magnetic tape recorder and a pen-type chart recorder.

The overall response characteristics of each component in this velocity-to-displacement measuring system is listed in Table V-2 for each of the components indicated by the block diagram in Fig. V-3.

I 1

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?A-3 ACCELEROMETER-The acceleration-type sensor used was a seismic 'self-generating unit-whose output voltage was proportional to the linear adeeleration of the surfac'e upon which it was mounted. The sensing element in the accelerometer was a special ceramic-type piezoelectric material that

generates an electrical charge proportional to its mechanical distortion.

This ceramic-type material was used to support a mass.such that when

= the system was accelerated along its sensitive axis, the acceleration forces at the mass would distort the piezoelectric ceramic generating an :

~ electric charge. . (The resultant voltage sensitivity would depend on the total capacitance of the piezoelectric, leads, etc. )

. The accelerometer was used with an Unholtz-Dickie voltage amplifier The output from the amplifier

. as shown in the block diagram in Fig. V-4.

was integrated twice by the linear amplifier and two-stage integre. tor. This double integration gave an output which was proportional to the duplacement.

The displacement. signal goes through a switching ' system to a tape recorder and a 6-pen chart recorder. The switching unit also allows the tape recorder to play back to the chart recorder.

l' The overall response characteristic of each component in this acceleration

.to displacement measuring system is listed in Table V-2 for each of the components indicated by the block diagram in Fig. V-4. j a

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V-16 A RECIRCULATION PUMP SPEED INSTRUMENTATION The rotational speed of the recirculation pumps was determined by counting the number of once-per-rev. spikes recorded on the chart recorder. . The sensing system used was a photocell and lamp assembly that saw changes in light caused by different width black marks painted on the pump-motor coupling. The changes in light caused a change in resistance of the photocell which is in series with a power source and a variable load resistor.

The pulses across the load resistor are sent through a switching circuit to a magnetic tape recorder and a 6-pen chart recorder.

The switching circuit allowed the tape recorder to play back to the chart recorder.

The relative position of the large and small pulse from the different width strips on the coupler determine the direction of the pump rotation.

O N.

~

, , V-17 0

TABLE V-2 SI'ECIFICATIONS AND RESPONSE CHARACTERISTICS OF VIBRATION INSTRUMENTATION COMPONENTS (1) .LVDT .

Case'- Manufacturer - G. E.

Model - Drwg. 761E392 Specifications: Operates underwater ats 1200 psi and from

. 70-550* F in a radiation field of 10 10 n/ cm2 sec. fast neutrons

. (above 1. 0 Mev) and 1013 Mev/ cm2 sec gamma.

Excitation - Sv - 3KHz from Validyne module case

. Linearity - within f 2% over range or f 0. 20"about null position Sensitivity -

Linear Variable Transformer - Manufacturer - Columbia Research Lah ,Inc.

Model - modified Cat. No. SL-200-S3R Range .f . 200 Freq. - optimum: 60 cps Null voltage: 2. 00 millivolts Output voltage: 1.08 Sensitivity: 0. 86 MV/. 001"/ Volt input

. Linearity 0 = . 25%

(2) Velocity Sensor Manufactur er: MB Electronics Mod el: 122(S). (S) denotes modified for high temperature i

. Specifications: Natural Frequency 4. 75 Hz Damping .65 q Open circuit sensitivity - 963 mv(rms/in/sec(rms) )

Suspension - Jewel bearing  !

Temp. Range - to 500* F Frequency range - 5 to 2000 Hz j (3) Accelerometer ,

Manufacturer - Columbia Research Laboratories, Inc.

Model - 902 Specifications - Nominal Sensitivity: 15pk-mv/pk-g (f 25% range)

Nominal Charge Sensitivity: 150 coul. /g  ;

Freq. Response: w/1000 Megohm load - I cps to 6Ke j w/10 Megohm load - I w/o cathode follower -

. 5 cps to 6 Kc Resonant Frequency: (1 minor mode) 32 Kc. (nominal)

Maximum Acceleration: 2,000 g Minimum acceleration: determine by sig./ noise ratio Aplitude Linearity: f 1%

, ,I i

V-18 (4) Stress Gage Manufacturer - Microdot Inc. (Instrument Division)

Model - SC 125 Specifications: -

Resistance - 120 ohm j 3. 5 ohm Gage factor - nominal: 1.80 Rated strain level - + 6000 microinches per inch

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Fatigue life - Exceeds 106cycles at +1000 microinches per inch Transferse Sensitivity - Negligible Operable Temp. Range - Static. -452' F to + 650' F Dynamic. -452' F to + 1500* F Gage factor change with temperature: G. F. varies inversely with temperature approximately 1% per 100* F.

Nuclear radiation - Negligible Material - Stainless steel (type 321)

(5) Balance Unit - Manufacturer - Validyne '

Model - CD-19-529 (specially built for G. E. )

(6) Strain Gage Shunt Calibiator Manufacturer - special unit built by Comp. Design Laboratory Model - Drwg.117C460 - ref. K. Miller and B. Tallman, G. E. , Component Design.

Specifications: To provide electrical equivalent of mechanical strain by shunting a 1 megohm resistor across the dummy resistor.

This change in bridge balance resistance provides a 101 microstrain equivalent signal for calibrating the chart recorder.

(7b) Module Case - Manufacturer - Validyne Model - MCl-20 Os cillator: Output voltage - Sv RMS, center tapped adjustable Frequency: 3000 Hz i1%  !

Power supply: Output - 7. 5,15 volts, 25 watts.

(7a) Demodulator Manufacturer - Validyne Model - CD-19 Plug-in carrier demodulator Specifications -  !

Power Requirements: Sv, RMS, 3KHz, f 15 VDC from MC1 ]

Input sensor sensitivity: IMV/V, 2. 5 Mv/V,10 Mv/V, 25 Mv/V  ;

Selector switch with 0-100% vernier potentiometer.

Output: 110 VDC @ 10 ma Non-linear'ity' - f 0.*05% full-s cale max.

Frequency Response 10, 0-50, 0-200 and 0-1000 Hz, j flat + 10% j

V-19 (8) Linear Amplifier and Integrator . j Manufacturer: Validyne Engineering Corp. ~

Model: AM 49 Specifications: Power requirements - f 15 VDC from MC-1 Output: A - f VDC_ @ 10 ma Gain - 2. 5'to 100 times in 6 steps Attenuation - O to .100% adjustable l 10 turn calibrated dial Frequency response - O to SKHz DC 1

- 2 to SKHz AC

! Filter Switch - selectable low pass; O to 50, O to 200, O to 1000; O to 5000 Hz .

(9) Amplifier Manufacturer - Unholtz-Dickie Corp.

Model - 8PXCV (special version of standard CV608RMG DIAL-A-CHARGE. Does not include the indicating meter or galvo circuitry. )

Specifications:

Input mode - Operates with voltage up to 15 volts rms with tranducers in the sensitivity range of 1 to 100 pk mv/pkg.

Gain ranges - 1, 3,10, 30,100, 300 and 1000 g i 1%

calibrated variable dial f10,10-100 pcmb or mv/g.

Output - 12. 5 volts peak on any range Ig to 1000 g, with transducer sensitivity 1 to 100 mv/g into a 2. 5K ohm load impedence or greater.

Frequency Response - Output flat within i 1% from 10 hz to SKhz and within f 2% from Shz to 10 Khz.

(11) Switching Circuit ]

Manufacturer - G. E.  !

Model - special component designed by J.. M. Sager, Comp. Design, G. E. Company.

Specifications - Passive elements (toggle switches and multiposition switch,es and relays)

V-20  :

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(12)- Chart Recorder Manufacturer - Clevite Corporation, Brush Instruments Division Model - Mark 260 recorder Specifications -

General - Number of channels: 6 analog, 4 event Channel width: 40 mm, 50 div. / channel l Writing method: Pressurized fluid Chart speeds: eight: 1, 5, 25,125 mm/sec 1, 5, 25,125 mm/ min Chart speed accuracy: f.25%

Electrical - Measurement range: 1 millivolt per chart division to 500 volts D. C. full scale Maximum signal input: 500 volts D. C. or peak to peak Frequency response: 50 div. f I div. to 40 cps.

10 div. f I div. to 100 cps.

3 db down at 125 cps J Sensitivity: Imv/div. to 10 volts /div.

(13) Tape Recorder Manufacturer - Consolidated Dectrodynamics Corp. (CEC)

Model - VR3360 '

Specifications - Tape speed: 15 in. / sec Center frequency: 27. 0 KC Information frequency: 0-5 KC f 0. 5 db ,

Full-scale signal to noise ratio (RMS signal /RMS noise) 43 db Harmonic distortion: 1. 5%

Input level - 0. 5 to 10 volts rms adjustable i

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