ML20238B085

870610 Seismic Event Rept

ML20238B085
Person / Time
Site:	Clinton
Issue date:	06/12/1987
From:	SARGENT & LUNDY, INC.
To:
Shared Package
ML20238B078	List: ML20238B085 U-600964, Special Rept:On 870610,earthquake Estimated to Be 5.0 on Richter Scale Noted.Walkdowns of Plant Structures & Sys Conducted.No Damage or Abnormal Conditions Observed.Related Info,Including Sargent & Lundy ...Seismic...Rept, Encl
References
NUDOCS 8709010056
Download: ML20238B085 (17)

Text

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. l JUNE 10, 1987 SEISMIC EVENT REPORT ]

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l CLINTON POWER STATION ILLINOS POWER COMPANY. l PROJECT NO. 7685-22 l l

DATE: JUNE 12, 1987 j l

Sergent t. Lundy Chicago, Illinois 8709010056g0 ADOCK 0 61 i PDR PDR S .

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• SARGENT & LUNDY

.- ENGINEERS I

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. I TABLE OF CONTENTS j l

1. 0 Introduction

2. 0 Event Description 3

3. 0 Plant Operations ,

4. 0 Plant Walkdown

5. 0 Clinton Plant Seismic Instrumentation

6. 0 Response Spectra Data l

7. 0 Triaxial Peak Accelerograph Data

8. 0 Summary and Conclusion l

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1. 0 Introduction l l

This report presents the recorded data and the effects of the June 10, 1987, I southeastern Illinois earthquake on the Clinton Power Station. )

2. 0 Event Description An earthquake vos felt at the Clinton Power Station at approximately 6:50 p.m.,

June 10, 1987. According to the National Earthquake Information Center in Golden, Colorado, the earthquake registered 5.0 on the Richter scale and was centered in Lawrenceville in southeastern Illinois. Lawrenceville is approximately 120 miles from the Clinton site.

Following evaluation of site seismic data, an Unusual Event was declared at 3:55

a. m. on June 11, 1987, in accordance with site procedures. The event was terminated ten minutes later following notification of State and Federal j agencies.

3. 0 Plant Doeration The plant was operating at approximately 20% power when the earthquake occurred. The plant continued to operate during and after the earthquake. None of the equipment, including the turbine-generator, malfunctioned or tripped on protective signals during or after the event. This leads us to believe that the vibratory levels at the Clinton station were small and did not affect the ,

integrity of the plant equipment. I Note that during the January 31, 1986, Perry earthquake (also a magnitude 5.0 i earthquake occurring approximately 20 miles from the Perry Nuclear Plant) two pieces of non-safety equipment tripped due to protective signals. (References i I

Letter from M. E. Edelman to H. R. Denton dated February 5, 1986, Letter No.

PY-CEI/NRR-0433L).

4. 0 Plant Walkdown Shortly after the event, the Shift Supervisor initiated a plant walkdown by l equipment operators to evaluate for potential damage. Approximately five hours after the event, the plant vna again inspected for any indication of unusual happenings or damage. This second walkdown was performed by joint teams of Illinois Power and Sargent & Lundy personnel; the walkdown inspection attributes for various plant socations are presented in Table 1.

I The walkdowns did not identify any visual indication of cracks, spalls, pipe or valve leaks, distortion of steel beams, cable trays or cantilever supports, equipment dislocation or any other damage.

The walkdowns indicate that the plant structures and systems were not affected by the lov level of earthquake vibratory motions.

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-i ENGINEERS The lov level of vibratory motions at the site is also confirmed by the lack of any damage or dislocation of contents of numerous non-seismic temporary office i buildings at the site (books falling off the shelves, dislocation of cabinets- t

' t and desk, etc.).

5. 0 Clinton Plant Seismic Instrumentation ,

Section3.7.4oftheClintonFSARoutlinestheseismicinstrumentationatth[', I Clinton power plant. The time history system-(FSAR Section 3.7.'4.2.1) and.

related response spectrum generation instrument were not ' operating at :the t.Lme s .

of the earthquake event. The inoperable status of this instrumentation van' reported to the NRC per Illinois Power letter No. U-600941, dated May 21, 1987.

The inoperable status of the instrumentation was the result of a. lightening strike affecting the free field instrumentation a-few weeks prior to the '

earthquake. . Thus, no earthquake data.was recorded by any of'the active seismic instrumentation located at the plant during this period.

The passive instrumentation consisting of the Triaxial Response Spectrum Recorder at elevation 699' in the Circulating Water Screen House and tbs three Triaxial Peak Accelerographs located within the main plant did record the' event.

6. 0 Resoonse Snectra Data  ;

A passive response spectrum recorder is located at elevation 699' in the. .

i Circulating Water Screen House. This instrument consists of 12 reeds in each'of l three orthogonal directions tuned to different frequencies encompassing a significant portion of the seismic response spectra. The peak respona,e of each

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of the reeds is recorded on scratch plates. The recorded data was. received by, S&L on June 11 and transmitted formally on June 12, 1987, per FPR 201,'600 ,

(Attachment A). ' l q

Figure 1, 2 and 3 present a comparison of the recorded response data points in the vertical, north-south and the east-west direction with the corresponding design OBE and SSE spectra. All spectra are for a 2% damping.

It can be observed that the vertical and the N-S recorded spectra are enveloped by the corresponding OBE spectra. The recorded E-W spectra is also enveloped by the corresponding OBE response spectra except at 20 Hz and 25 Hz. ,

All recorded responses are lower than the corresponding SSE spectra.

In our opinion, these comparisons show that the recorded event at Clinton was well below the OBE event for the following reasons:

l A. At 34 of the 36 response frequencies, the recorded acceleration is.

substantially below the OBE spectra. The OBE' spectra is an 84 percentile spectra. Thus, there is a 16% chance that'at some frequencies the spectra may be exceeded for a given event. The recorded data exceeds the OBE

pectra at only 2 of the 36 points.

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B. The excendance at two of the frequencies (20 Hz and 25 Hz) is indicative of )

high frequency contents of the ground motion and thus, is not significant (see NUREG-0887, Safety Evaluation Report, Supplement No. 9, Perry Nuclear Povor Plant, March 1986). It is not unusual for lower magnitude j earthquakes to have high amplitude, high frequency peak accelerations of i limited durations. These high frequency peak accelerations are usually of short duration and little energy and do not cause damage.

C. The response spectrum recorder is passive equipment. If prior to the earthquake the instrument was bumped, imparting a shock, the recorded l rendiro may be indicative of the magnitude of this shock and not the f earthquake motion. This is more likely to affect the high frequency recording.

7. 0 Triaxial Peak Accelerocraoh Data Three triaxial peak accelerographs, each measuring the absolute peak acceleration in three orthogonal directions are located as fo11ovat A. IVR-EM012 located in Auxiliary Building, Elevation 718' on shutdown service water piping.

B. IVR-EM013 located in the Diesel Generator Pu11 ding, Elevation 729' on top of diesel oil storage tank.  !

C. IVR-EM011 located in the Containment Building Elevation 791' on top of the Stand-by Liquid Control tank.

The recorded data was received by S&L on June il and transmitted formally on June 12, 1987, per FPR 201,600 (Attachment A).

The recorded data for the three instruments is presented in Table 2. The table slan presents the OBE and SSE response at these locations. The recorded i responses are higher than the OBE and SSE design responses by an order of This can only be attributed to erroneous recorded data for the magnitude.

following reesonn A. The diesel oil storage tank is supported on the base sat and is rigid in the N-S direction and fairly rigid (>10 Hz) in the vertical and E-W direction. The high peak acceleration values recorded (0.79g to 3.9g) are inconsistent with the response spectra recorded at the circulating water screen house, with the plant walkdown data showing no visible adverse effects of the earthquake and the fact that no equipment tripped during the event.

B. The high peak acceleration values for the shutdown service water pipe and the tank, both located near the base mat, are totally inconsistent with a 5.0 magnitude earthquake occurring 120 miles from the site.

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SARGENT & LUNDY EH3INEERS C. The +ve and -ve acceleration values during an earthquake are likely to.be

, the some. The recording snows large differences between the +ve and -ve magnitudes of the recorded data. This leads us to conclude that the data is inaccurate and is not the result of the seismic event.

D. The three accelerographs are passive recorders. It is possible that the

$ instruments may have been bumped or the recording strip scratched during it installation or removal. The calibration of 0.1' per 5.0g acceleration

' also makes the recording very susceptible to error. For a 1.0g response, the length of the recorded scratch mark will only be 0.02" long.

Brmbd on the above, we believe that the trinxial accelerograph data is in error and nct representative of the earthquake antions in the plant.

8. 0 Summary end Concitsion On June 10, 1987, the Clinton Peser P1snt structures and systems experienced lov

)'- level. vibratory motions due to en earthquake centered at Lawrenceville in i southamscern Illinois. The earthqusk'e measured 5.0 on the Richter scale.

Lawrenceville is approximately.120 miles from Clinton.

The plant was operating at about 20% power at the time of the earthquake. It continued to operate during and after the earthquake without incidence. The ve.1kdcQn hf the plant by Illinois Power personnel and Sargent & Lundy engineers did not detect any cracks in valls, looks at flanges, dislocation of equipment or any other adverse effect on plant structures or systems. Similarly, the earthquake did not cause any damage to the temporary office buildings or their contenta (books falling off the shelf, dislocation of cabinets or desks, etc.).

These observations indicate,a very low Level of vibratory motion at the site.

The respcnse spectra record shows that the vibratory motions were well below the OLE datign levels except for two isolated high frequency points in the E-W direction. 7ased on the low magnitude of response, its high frequency and past evalueulon showing lack of damage due to short duration, high frequency motions due to a low magnitude earthquake, it is concluded that the isolated exceedance at two high frequency points is not indicative of vibratory motions larger than the OBE desigra basis.

'The triaxial accelerograph data shov> extremely high (up to 5.6g) acceleration

-values. The data is judged to be erronecus as such high g levels are inconsistent with the lack of dkmage at the plant or the surrounding area and the fact that equipment trips did not occur. The data is also not zero mean data, expected during an earthquake event. The triaxial recorded data should be discovated.

In conclusion, the vibratory actions at the Clinton site were well below the plant desigex0BE level.and the plant structures and systems were unaffected by the earthquakA ,

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, ENGINEERS TABLE 1 PARAMETERS TO EXAMINE Location: General Area Parameters Obvious spalling of concrete  !

Obvious damage to concrete walls Leakage of flanges / nozzles Expansion anchors pulled out Embeds pulled out; spalling of concrete un edge Distortion of cable trays /HVAC ducts Distortion of end brackets on hangers /enubbers Location Control Building Elevation 800' .

Check masonry block walls all around/near attachments for cracks, spalling of paint / mortar.

Check any expansion anchors for obvious damage; particularly any with cantilever members. - '

Check any accessible cable trays for any unusual displacement or buckling.

Check any accessible HVAC duct for any unusual displacement or buckling.

Location: Containment- Outside Dryvell (All Elevations) y Check connections on radial beans for any indication of movement or damage.

Check accessible equipment for leakage at nozzles.

1 Check mirror insulation for crushing, gaps, movement.

Check any expansion anchors for obvious damage, particularly any with cantilever members.

i l l Check any visible embed connections for spalled concrete at embed edge.

Check any snubber end brackets for any obvious distortion (possible locked snubber).

', Check " shake space' for any obstructions, concrete crushing. j 1

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• SARGENT & LUNDY ENGINEERS I

TABLE 1 (CON'T) f 1

Location: Main dam Check strip chart and remove, document any drop in lake level.

Look at overflow discharge; document any excessive flow (document depth of water at discharge).

l Location: Screen House Look for water seepage in pipe chase for SX piping (access was unavailable).

Look for enlarging of cracks.

Look for any expansion anchors with visible damage.

Look at bolted pipe flanges for damage.

Look at spalling at embeds and anchored penetrations.

Locations: RHR Bay Look at lateral restraints for any distortion, embed damage.

I i Look at RHR nozzles for any obvious leakage.

Look at any concrete expansion anchors for obvious distortion, damage, pulled anchors.

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SARGENT & LUNDY ENGINEERS TABLE 2 /If COMPARISON OF TRIAXIAL ACCELEROGRAPH RECORDED OBE AND SSE DATA (gs) 1 E-W VERTICAL N-S LOCATION. + ,

- + - + -

1. Diesel Oil Recorded >3.9 .78 2.2 .98 .78 .39 Storage Tank OBE } < .11 .11 .11 .11 .11 .11 DG Bldg.EL.729' SSEj6'if .25 .25 .25 .25 .25 .25 Q'# v gu y,

2. Shutdown Service Recorded 1.4 1.37 1.6 .78 1.8 1.56 Water Pipe, Aux. OBE .175 .175 .162 .162 .297 .297 Bldg. EL.718' SSE .237 .237 .273 .273 .396 .396 m - t r He

3. Standby Liquid Recorded >5.5 2.9 2.4 1.18 >l.8 0 Control Tank, Cont. OBE .18 .18 .23 .23 .18 .18 Bldg. EL.791' SSE .34 .34 .53 .53 ' .34 .34 NOTE: The positive reading report is the larger of the two measurements taken at each accelerograph.

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ENGINEERS JUNE 10, 1987 SEISMIC RESPONSE 1

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FIELD PROBLEM REPORT Originator (Print) h. h00fle-/ ext. 2 $ FPR No. 2Oi, /cDO Mail Code

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j' i ENGINEERING DISPOSITION: i June 10, 1987 Seismic Event Report Attachment A r

Preparer /Date / Organizatich' Department Head Approval: '

Signature / Date

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.CLdSS CODE: NNNN2

' l CPS No. 1337.05D001 .

(Rev. 0)

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' ' . ' 'CI' ASS CODE: NNNN2 CPS No. 1337.05D005 (Rev. 0)

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l (8.2.1.1)

S/N fObb '

(6.2.1.1)

DEFLECTION DISTANCE CALIBRATION ,

P-TO-P DATA ACCELERATION l FREQUENCY PLATE # (EZ) (mm) (G/mm) (G's) I IL 2.00 .8 (REED 1) '.o144 . Ol1

. o zl+ . o o 6, 2L 2.52 .3 (REED 2)

3L 3.17 .3 (REED 3) .o3H .o10 l 4.00 . 2. (REED 4) e 0 60 2- it .00 6 4L ,

SL 5.04-

.5" (REED 5) 07 8'i , o19 l- 6L 6.35 .3 (REED 6) . / 2.1 .oI8 i 7L 8 . 0 0 -- .5 (REED 7) ./S+ .O%

8L 10.1 .8 f (REED 8) .292 . (I6 9L 12.7 .4- (REED 9) .236 , 047 -

(

.a 10L 16.0 .

7 (REED 10) .345 .I26

. t. o c 11L ,

20.2 .

. 4- (REED 11) Mfb .12I i 12L 25.4 3 (REED 12) .965 , 13(2 l

l .

Signature fM )/af Date / / J vu 87

. (8.5.2.I14) .

ACC = DEFLECTION DISTANCE X CALIBRATION DATA 2 ,

F Ao x qo* /t e no w4 w AS TAkEM 4 T r naco w as 39.o se 1 ..

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