ML20236Y145

Forwards Summary Response to NRC Concerns Involving Structural Integrity of Recirculation Loop B Operational Vibration Loads

ML20236Y145
Person / Time
Site:	Columbia
Issue date:	11/21/1985
From:	Powell WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Bradfute J NRC
References
TAC-60344, NUDOCS 8712110129
Download: ML20236Y145 (9)

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l Summary Response to NRC Concerns involvina Structural Inteority of Recirqui,ation Looo-B Under Operational Vibraeton loads WNP-2

'Large Bore Pipina Inteority Steady state vibration displacements measured by lanyard trans-ducers during power ascension testing and post commercial opera-tion, prior to pump shutdown, revealed piping displacements far below the GE criteria for acceptable steady state operation. In addition, inspection and stroking of all snubbers in the vicinity of the pump was completed. All snubbers were found in excellent condition showing no signs of vibrational wear or increased drag load resulting from abuse under high cycle or large amplitude vibration displacements. Vibration measurements taken during and following our spring outage revealed peak half amplitude piping displacements on the order 0.004 inches. GE analyses, utilizing their design basis piping model, determined peak alternating stress levels (including ASME Code stress concentrations) to be less than the endurance limit for the maximum vibration levels CD$efved during outage testing.. Aesulting from these inspections, measurements, and analyses we hold a high level of confidence that the vibrational displacements are well within the capability of the piping systemeand that no significant fatigue damage has been incurred. To prpvide further assurances of the piping integrity full ultrasonic examination of the highest stressed welds identified by the GE vibration analyses will be completed at the next spring outage.

Small Bore Pipino Attachments Of approx imatel y eight small bore piping connections (vents, instrumentation taps, etc.) two worst case lines were selected for detailed harmonic analyses. Harmonic displacement amplitudes o f 0. 01 inches were imposed at the small bore attachment points to the recirculation system and frequency sweeps were conducted through the critical system frequency ranges and vibration driv-Ing frequencies observed during testing. Peak stress results (Including weldolet Intensifications) were well below the 8000 psi endurance limit selected for these connections. Peak accel-eration points were established by the analyses and accelero-noters have.been mounted at these points to field verify the ana lyses and snel l bore attachment stresses. During the spring outage virtually all small bore connections were dye penetrant examintd and no linear indications were found.

Pulpo ShhFt FatIque Utilizing the impeller radial loading results from the GE piping vibration analyses a stress analysis of the pump shaft was a

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completed. This hand calculation demonstrated maximum principal stresses are on the order of 2 to 4 ksi under combined loading of the maximum motor torque. Clearly the shaft integrity is very high and fatigue life is in the " Infinite" or endurance limit regime. .

l Valve Operator Resonance The valve operators on both the suction and discharge isolation  !

valves,(RRC-V-238 and RRC-67B respectively) have measured natural '

frequencies near 30 Hertz which is resonant with the pump motor speed of 1800 rpm. GE completed a structural analysis bounding the worst case measured resonant response of valve operator 238 and established stress levels below endurance limit thresholds.

These resonant conditions were observed during our spring outage and steps have been taken to detune these structures. A line mounted hydraulic damping device was installed on valve operator 236 and stiffener plates were installed on the stanchions of valve operator 678. The performance of each of these detuning options will be evaluated from data obtain during future test runs (accelerometers have been installed on the operators of both valves). Analyses for each option were completed to assess component and system loads.- final design refinements and analyses will be completed following evaluation of the test data. Both operators are non-active components. Inspections and bolt torque checks were competed to ensure structural and installation adequacy.  ;

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l' D. Hot Performance Te'st .,1 e ..; .- ,

On July 10,1973 at 1005 <.

hours a hot (500 to 533 degrees ,i:..% -

Fahrenheit) hydraulic performance test was run on assembly DE'. ,~ .-

The following i's a tabulation of various data taken in con-

• l' jtutetion with the Hot Performance Test. ,

FRAME VIB. MILS. SEAL LEAKAGE _

POINT FLO GPM...' SHAFT VIB. MILS _

X. Y, X Y DZfER ,

9.7 9.3 2.3 '1.1 40

1. 10,913 ,

9.0' 1.2 0.8 40

2. 20,108 9.1 ~

8.0 1.1 0.7 40 8.0 l 24,464

3. '

1. 0 ". 0.5 40 -

4. 30,760 6.7 6 . ,8.

0.9 0.4 40 .

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5. 39,296 5.0- 5.8 '

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0.7 40

'g'6. 47,740 _ 5.4 6.7 . 1.3 5.5 0. 6- 0.8 50

7. S1,433 5.1 046 0.5 50 -

8. 54,500 5.1 5.5 -

and data caht be found in Appendix 1.

Performance curve No. 32157

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EAWLINK MisX B"J'/699 AOQ1 AJJ P.D 11 : 2. . .. FET Fh0Ms TLX R34900 dINDid!!.t. T,' F TL 360517 1.Jf NbWILL T2 PTL DINGHAM HILLAhETE VACUUM DEPp .

TO: 62G79556 7/25/83 NGG. NO. 0725BLF -

TO: W.P.P.S.O.

.HANFORD NPS

, ATTNs JEFF GELHAUS/STAN DAVIGCN REFs REACTOR RECIRCULATING PUMPB 210099/100 FOR YOUR DENEFIT WE HAVE COMPILED VIBRATION READINGS OF THE GAME TYPE PUMPB AS HANFORD. THESE READINGS ARE GATHERED DURING THE HYDRAULIC TEST OF THESE PUMPG AT CUR EACTORY IN PORTLAND.

-m m HANFORD II 210099/100 (.

DE . N ~ D F ,,'

LASALLE I AND II 210095/9G DA'AND.DD DC A D DD - Sa de /o G g g NINE MILE POIN1 II'14217001/2 AT RATED (MILS)

. AT 20 PERCENT FLOW g) MOTOR FRAME SHAF't TOP , SHAFT FRAME i

DA 4.7 .6 9.0 1.2 HOT 9.6 1.2 COuD DB 6.0 1.0 -

B.5 1.0 HOT

. 9.0 1.4 COLD DC 7.0 1.1 . 10.5 2.3 HOT 10.9 1.6 COLD DD 4.0 1.4 G.4 1.9 HOT DE 6.7 p

10.O_ . _ __ . 2 . 1. _ COLD.

1.3 9.7 1.0 HOT {

14.3 1.6 COLD I DF 4.5 1.1 7.6 2.0 HOT '

k G.2 .1,O COLD DK 4.5 1.O ~ " ~ "

UNAVAILABLE DL 6.0 .70 UNAVAILADi.E FRAME VIDRATION ON DK AND DL TAKEN AT MOTOR GUPPORT FLANGE.

AT RATED FLOW READINGS LOOP AT 533 DEG. F. 20 PERCENT FLOW RF.ADINGS ON 40 OR 100 HOUR RUN. ALPHA SERIES, I.E., DA, DB, RCrERH 10 IMPELLER. .

l HOPE TO HAVE D.'.ACK FOX READINGS SOON.

AFGARDS,

l. 00kDOlJ FARKS H NGPAM-Wil*.LSMETTE COMPANY FORILAND, OREGDN ~

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' sic 2es ses woad

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... 2 EASYLINh" MBX E4202'i71.' 'A' . .FJL95 10:24/15:59 EST .

Fh0M TLX BG4900 BI(G'5 1L :) PTL .

560517. DINGWIt.L D PTL BINGHAM WILI. AMETF V2*f'.1/JM DEPT TO 62879556 07/26/05 '

~ MSG NO 072685E ,

ATTN ' JEFF GELHAUS/STAN DAVIDSON

.CC H. TAFi~ARADI .,

REF: . REACTOR RECIRCULATING PUMPS ,  :

DWC. PUMP SERIAL NOS. 210099/100 .

. MY TEL.EX DATED JULY 25, 1985

..~,-4THE.VIBRATIGN READINGS.FOR DLACK FOX ARE NOW AVAILABLE.

FLACK FOX OON01/04, DG DH DI DJ ALL READINGS AT RATED FLOW. SPEED 1900 RPM. LOOP' TEMPERATURE 530 DEGREES F. ,

G.s .

-(1 GHAFT MOTOR SUPPORT FLANGE DG . 3.0 1.4 DH 6.0 1ae DI 6.0 i 1.0 DJ- 5.3 ;2.6 REGARDS, -

GORDON PARKS -

MMMM A .

m esset 1Z'II A G8. 668Z 222 68C WOHd

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