ML20044G170

Seismic Occurrence of 930330, Engineering Evaluation

ML20044G170
Person / Time
Site:	Cooper
Issue date:	05/04/1993
From:	Mcclure G, Siedlik M NEBRASKA PUBLIC POWER DISTRICT
To:
Shared Package
ML20044G166	List: ML20044G165 ML20044G170
References
NSD930667, NUDOCS 9306020113
Download: ML20044G170 (12)

Text

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't Attachment'to NSD930667 Cooper Nuclear Station I

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t SEISMIC OCCURRENCE OF MARCH 30.1993 L

I Engineering Evaluation

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Prepared by:

5%)hda i Sk/23 M. J. Siedlik

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1 I.

EVENT DESCRIPTION l

1 At 2002 on March 30, 1993, an earthquake estimated at 2.8 on the Richter Scale occurred in and around the Brownville - Fall City area of Southeast Nebraska. Cooper l

Nuclear Station was shut down and defueled at the time of the event. The magnitude of j

the carthquake was strong enough to trigger annunciator B-3/B-1 " Seismic Event >

i 0.0lg" which alarmed in the Control Room. Upon receipt of this signal, CNS operators j

. immediately initiated Emergency Procedure 5.1.1, " Earthquake," which among other things provides guidance for assessing any possible damage to the plant. Additionally, Instrumentation Operation Procedure 4.12, " Seismic Instrumentation," was used to determine whether the operational capability of the plant had been impaired by the

-i earthquake. The guidance provided by these procedures ensures that USAR Volume I,Section II, Subsenion 5.2.5 requirements are met.

l I

II.

ACTIONS TAKEN FOLLOWING THE EVENT l

t A.

Notification of Unusual Event (NOUE)- After verifying the validity of the event l

as required by procedure, a NOUE was declared at 2018 on March 30,1993c The NOUE was terminated at 1600 on March 31,1993, after the results of walk i

down inspections of safety equipment and initial time history acceleration data l

were reviewed by SORC.

l 1

B.

Outside Contacts to Confirm Event - Fort Calhoun and Wolf _ Creek were contacted to determine whether their instrumentation recorded the earthquake.

.j Neither of these utilities recorded the seismic event, presumably _ because of the j

carthquake's small magnitude.

i The National Earthquake Information Center in Golden, Colorado was contacted j

by the Control Room f.hortly after the event. At that time in the evening, the i

information Center had very little information. The next day, March 31, Vern Stairs and Rick Gardner talked to Mr. Willis Jacobs at the Information Center who indicated that the earthquake measured approximately 2.8 on the' Richter Scale with an epicenter located approximately 65 miles southeast of Lincoln, l

Nebraska.

Mr. Jacobs also indicated that this was the first earthquake in j

southeast Nebraska since June 5,1963, when a 3.0 magnitude event was recorded i

near Syracuse, Nebraska.

C.

Plant Inspections - Operations personnel inspected se!ected safety systems 1

immediately following the event. Follow-up inspections continued the next day.

l to encompass additional systems and to disposition any concerns identified during carlier inspections. It was concluded that no damage could be atributed to the I

seismic event. The walk down inspections are summarized in Attachments 1 and 2 to this repon.

D.

Seismic Instromer.tation - Seismic motion is recorded by two types of systems at CNS. The primary system is composed of three Kinemetrics Model SMA-3 i

Strong Motion accelerographs. Each accelerograph records acceleration time j

1-

histories for two horizontal directions and one vertical direction.

One accelerograph is located just north of the Intake Structure for recording ground i

motion. Another accelerograph is located in the Reactor Building NW Quad 859' l

level for measuring structure base matt motion and the third accelerograph is i

located in the northwest corner of the Reactor Building 1001' level for measuring -

1 in-structure floor response. The accelerographs are located such that actual-i seismic events can be compared to the mathematical model used to design the J

Reactor Building and safety systems located within the building.

All three accelerographs operated as designed during the event and removal of magnetic l

recording tape cassettes was performed per procedure. The tapes were sent to-Kinemetrics for analysis who submitted their findings to the District on April 4, 1993 (see Attachment 3). Kinemetric's analysis shows that the peak acceleration j

was only 0.04g. the duration for this strong-motion acceleration was less than.5 l

seconds and th? cominant frequency lor the event exceeded 20 hertz. All of these

j attributes correspond to an event of very low energy and, therefore, no equipment l

or structural damage. This finding is consistent with all other indications of the i

earthquake's strength, i. e., the walk down inspections, the fact that little or no j

physical sensation of earth movement was reported and the information provided.

~j by the National Earthquake Center in Golden, Colorado.

l The second recording system at CNS consists of three Engdahl Enterprises Model i

PAR 400 Peak Acceleration Recorders. This system is intended as a backup to the SMA-3 system. The PAR 400 units are self contained and do not require a power source; however, they only have the ability to record peak acceleration.

l Time of event, duration and frequency domain cannot be determined, therefore, i

any information obtained is of very limited value. One of the PAR 400 units is located in the drywell mounted to the support skid for the reactor vessel at elevation 915'. This unit did not record any motion during the March 30 seismic event. The other two units, one located on Core Spray A line entering the Drywell at elevation 946' and one on top of the PC Isolation Relay Panel irt the Cable Spreading Roo;n, both recorded peak accelerations in excess of 1.0g. To resolve the apparent discrepancy between these two recorders and all other indications of event magnitude, a review of past readings for the PAR 400 units' j

was undertaken. It was found that high acceleration readings have been recorded in the past. It appears that these two recorders are located on items of equipment.

that are subject to shock loads.

For this reason, the data from these two recorders must be disregarded.

Ill.

SUMMARY

FINDINGS All required procedures were appropriately initiated and concluded in a timely fashion.

1 The earthquake contained little energy and as such was not structurally signincant.

t The input time history acceleration used to design CNS greatly exceeds the March 30, j

1993, time history acceleration obtained from the strong motion accelerograph 1.ocated north of the Intake Structure. The Safe Shutdown Earthquake for CNS is based on a.

r peak ground acceleration' of 0.2g sith strong motion lasting for 30 seconds. Thel l

t (

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March 30,1993, event was limited to a peak ground acceleration of.04g with the strong motion lasting less than 0.5 seconds. Because of the limited data obtained dering this event, it is not possible to perform a meaningful seismic analysis of the Reactor Building as speci6ed in Volume I,Section II,. Paragraph 5.2.5.2(5) of the USAR. Given the large differential between the CNS design basis input motion and the March 30 input motion -

it is clearly evident that the CNS design basis response spectrum would envelope any response spectrum that might be developed using the limited information available from the March 30, 1993, seismic event. This report, in conjunction with the: analysis provided by Kinemetrics (Attachment 3), suf5ciently documents this event.

IV.

LESSONS LEARNED The earthquake was inidally reported to the media and others as having a'. peak-acceleration of 0.07g, whereas Kinemetrics determined that peak acceleration never exceeded 0.04g. This discrepancy arises because the data sent to Kinemetrics must be corrected to compensate for any tape speed Ductuations in the recording or playback.

process. To ensure that initial data is understood to be only a rough estimate. NED will -

add a note to Procedure 4.12 advising the Shift Supervisor of this caveat.

The two PAR 400 units that recorded high accelerations are not providing useful information because they are mounted on equipment subject to shock loadings during.

normal operation. The core spray line is subject to movement during pump starts and the cable spreading room panel would experience a shock loading when the doors are closed. NED will correct this situation by either justifying elimination of the recorders or by relocating them to neas not subject to movement during normal opemtion.

V.

REFERENCES A.

Letter (NSD930435) dated April 1,1993, to Mr. James L. Milhoan, NRC from G. R. Horn summarizing the March 30 seismic event.

B.

USAR, Volume I,Section II, Subsection 5.2.5 C.

CNS Emergency Procedure 5.1.1, " Earthquake" D.

CNS Instrumentation Operation Procedure 4.12, " Seismic Instrumentation" E.

CNS I&C Procedure 14.3.1, " Seismic Accelerometers Plate Replacement and Data Reduction" F.

CNS I&C Procedure 14.3.2, " Seismic Accelerometers Plate Replacement and Data Reduction" G.

CNS Emergency Plan Implementing Procedure 5.7.2, "Notincation of Unusual-Event".

i

/17" TACH M EN 7~

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M1ArtCH 361993 SE b >C O CCURRENC E "

REPORT OF WALK DOWN FOLLOW 7NG 3/30/93 SEISMIC EVENT The follouing SSC's were walked down by operations immediately following the event (taken from notes of Ken Riley).

Tim Mueller-1001, SGT, SLC, QUADS (ie. RHR, CS, HPCI & RCIC)

Jeff McWilliams-Torus area Keith King-RW, ARW, Condensate Tanks, Fire Tanks, and N2 Tank.

Ken Nosbish-DGs & Fuel Tanks.

Tim Slenker-Turbine Bldg, control Bldg including Batteries, and Intake Bldg including SW.

Ken Nitzel-Under vessel Richard Tandrup-Drywell At 0100 3/31/93, R.

W.

Foust (CNS Engineering) and Todd Duren (Civil Engineering) performed a close examination of selected SSCs.

The purpose of this inspection was to identify any evidence of the event.

Symptoms examined for included displacement, shifting or deformation of anchorages; cracking of walls, floors, or grouting (particularly at footings);

and pipe leaks or deformation.

SSCs were selected as either those that would most readily exhibit symptoms (eg.

scaffolds),

or were particularly important to shutdown management (eg, diesel generators), or would experience the most shock (eg.1001).

This inspection included:

ECST's, DG2 (engine, control panel, H&V fan spring mounts, IR LBAS), Aux. Relay Room (9-45, 9-39, TOPAZ invertor), Main control room (9-3, 9-4, 9-5, 9-15), 1001 (metal structure to concrete interface in the NE and SE corners), Rx Bldg RR airlock (inside), Rx Bldg walls in SE corner of bldg from 1001 to lowest level of quad, and various scaffolds in the Rx and Control bldgs.

No evidence of the event could be found.

It should be noted that numerous unsupported / unsecured items in non critical areas were examined (eg.

office equip).

These items also snowed no evidence of disturbance.

Additionally, interviews with numerous personnel throughout the plant indicated that. although the event was clearly audible in most areas, no displacement of objects was observed.

At 0230 B.

Nitsch (CNS Mechanical System Engineer) performed a walkdown of the Torus IAW 6.3.10.12.

His note.n are as follows:

No visible cracks found on any of the column stiffeners, column base plates or torus saddle welds.

Minor crac: ting of the painted surface was noticed at the torus pivot supports 4 Cracks were very small but looked fresh.

Pivot pin must have rotated slightly.

Grouting holding the support columns also had minor cracking at every support.

Could not tell the age of the cracks.

Civil Engineer Tod Duren notified.

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MAR.uf 30, I993 ' $EISm oC OccuRREMG 1

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Date March 31. 1993 Tb M.

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SIEDLIK FOR INTER-DISTRICT BUSINESS ONLY l

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YANTZ Subject RESULTS OF TORUS AREA WALKDOWN

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I have completed a walkdown of the Torus Area to investigate concerns noted during an earlier walkdown (see attached letter). The minor. cracking of the painted surface at the torus pivot supports should not be attributed to the seismic occurrence since it is more likely that these cracks resulted from upward displacement of these support points as water was drained from the torus

~

for DC 91-038.

At this time the torus is still empty, allowing this

-l displacement to be visible.

The grout at the support columns which was noted to have minor cracking was also closely inspected. The cracks found in the grout pads are not fresh and can be attributed to shrinkage during curing.

In addition to shrinkage cracks

+

in the grout, several cracks were found in the paint on the grout pads. After removing loose paint chips, it was evident that these cracks do not extend into the underlying grout. No grout cracking can be attributed to the seismic occurrence.

r I

I also inspected the support column base plates where the Lubrite plate transition occurs.

It is evident that the support column base plates had not shifted on the Lubrite plates.

In conclusion, neither the paint cracking on the pivot pins nor the grout l

cracking can be attributed to the seismic occurrence since no other e

displacements can be verified.

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t fm tW Ronald L. Yantz Senior Civil Engineer Attachment cc:

G.

S. McClure R.

L. Gardner i

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April 4,1993 k

J General Office 141415th Street 1

Columbus, Nebraska 68601 Attn: Mr. M.J. Siedlik i

Subject:

Rawdata playback and letter report

Reference:

NPPD Purchase Order 93-8249

Dear Mr. Siedlik,

i In accordance with the above NPPD Purchase Order, please find enclosed strip chart records corresponding to the events contained on the three FM cassette tapes submitted to Kinemetrics l

for analysis. Analysis for peak acceleration and strong-motion duration are given below ~ In -

addition, per your request, an estimate is given for the most dominant frequency discemib'e in

-cach of the acceleration time histories.

General Information' On March 31,1993, three FM cassette tapes were submitted by Nebraska Public Power District j

to Kinemetrics for analysis. Event information was not available from the cassette' labeling.

l However, it is likely that the event recorded by the Kinemetrics Model SMA-3 Strong Motion I

Accelerograph System corresponds to a Richter Scale M2.8 earthquake which occurred March 30,1993 at 8:02, p.m. local time. The coordinates for the canhquake are reponed as: latitude' 40.3* North,95.7* West.

b The FM cassette tapes from Cooper Nuclear Station were played back on a Kinemetrics Model

.i SMP-1 Playback Unit. The demodulated output from the SMP-1 is fed to a Kinemetrics Data j

Compensator unit which electronically provides amplitude compensation to correct for any tape:

speed fluctuations in the recording or playback process. The 1024 Hz signal from the fourth -

track of each cassette tape is'ditided by 256 to produce a 2 pulse-per-second (pps) reference-j signal. The tlure channels of amplitude compensated acceleration time history and the 2 pps reference signal are output to a four-channel strip chart recorder.

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• Provided by the U.S. Geological Stuvey, Lakewood, Colorado--

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L MINEMETRICSINC. ' 222 VISTA AVENUE. PASADD4A. MLIFORNLA 91107 - U.Sf(sts)791W2220 ' TEtEX 67.s402 IGAETRICS PSD FAX (018)796 0000 ij r

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.l Mike Sieclik i

April 5.1993 l

Page 2 of 3

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Table h Instrument Locations and Channel Orientations Location SMA-3 Channel Channel Nominal Orient-i S/N No.

Designation Sensi-ation tivity for

+ accel

+

Ground level, Free-113-1 1

Longitudinal 2.5 V/g

{

field site, NE yard 2

Transverse

_2.5 i,

3 Vertical 2.5

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• ge s,. & ;g,;y,'

I13-2 1

Longitudinal 2.5 pv pos g59 2

Transverse 2.5

,c,,,,

3 Vertical 2.5

\\

113-3 1

Longitudinal 2.5

.l g A Bu;/dt y

<g 2

Transverse 2.5 l

3 Venical 2.5

,gg,.y

• Re:erence tne ongmal comnussiomng repon or visit each locanon to cetermine sensor elevanons and orientatiot.s.

i Manual Analysis The accelerographs appear to have actuted from the S-wave arrival.

The functional test records brackedng the recorded event on each cassette tape indicate that the accelerograph system was operating in a calibratable manner both before and after the recording of the event. The first 100 milliseconds of the acceleration time history data are excluded from i

the manual' analysis as these signals are subject to distortion from tape-speed " ramp-up" associated with the turn-on of the tape deck motors.

i Table 2: Manual analysis results 4

SMA-3 Channel Channel Peak Strong-Dominant 3

S/N No.

Designation Accel.

Motion Frequency -

Duranon i

113-1 1

Longitudinal 0.02 g 27 Hz i

2 Tmnsverse 0.04

< 0.5 sec 23 3

Vertical 0.02 22 i

t 113-2 1

Longitudinal 0.04

< 0.5 32 i

2 Transverse 0.03.

< 0.5 31 i

3 Vertical 0.02 40 I

m 113-3 1

Longitudinal 0.01 19 2

Transverse 0.02 25 3

Vertical 0.01 25 i

For purposes of this analysis, strong-monon is defmed as.4).03g.

x

51ike Siedlik 5,1993

og 3 of 3 The nominal accelerometer sensitivities are derived from the Channel Calibration Report dated May 25-28,1989; which contains the most recent calibration data available for the system.

The remote sensor packages employed in the Cooper Nuclear Station Seismic Monitoring System are Kinemetrics Model EMA-3 Electromagnetic Accelerometers. The response of these devices is nominally flat to acceleration in the frequency band of 0.1 to 25 Hz. Determination of the sensor rall-off characteristics above 25 Hz, if required, will require dynamic calibration of each sensor axis.

Small spikes across all three channels in the acceleration time history are instrument related; the e

most probable cause of which is the mechanical tape deck assembly.

j i

The signal to noise ratio is low for this event; on the order of 3 or 4 at best. Further processing i

would not typically be recommended as the digitired records would be subject to random digitization errors.

I Summas y The seisn.ic monitoring system actuated and recorded the seismic event in accordance v;ith its design.

i A small earthquake of short duration, characterized by the informadon given in Table 2, was recorded by the monitoring system.

Digitization and funher analysis is not recommended due to the low signal to noise ratio.

j i

4 Thank you for selecting Kinemetrics for your earthquake record processing needs.

i Please feel free to contact me should you have any questions or comments regarding this report.

SinceN1y, l

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R.A. Merrill Services Manager RAM:1pe enclosures: noted ec: Kinemetrics Sales Order File N-K3213

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