ML20235E613

Special Rept 87-06:on 870622,actuation of Seismic Monitoring Instrumentation Occurred.Probably Caused by Equipment Malfunction.Further Investigation Underway to Determine Exact Cause of Malfunction

ML20235E613
Person / Time
Site:	Callaway
Issue date:	07/06/1987
From:	Blosser J UNION ELECTRIC CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
87-06, 87-6, ULNRC-1545, NUDOCS 8707130021
Download: ML20235E613 (4)

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Canaway Plant July 6, 1987 U. S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 ULNRC-1545

Dear Gentlemen:

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 FACILITY OPERATING LICENSE NPF-30 SPECIAL REPORT 87-06 ACTUATION OF SEISMIC M0"ITORING INSTRUMENTATION The enclosed Special Report is being voluntarily submitted pursuant to Technical Specification 4.3.3.3.2 concerning an actuation of seismic monitoring instrumentation which was not the result of seismic activity.

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L J. D. Blo ser g Manager, Callaway Plant

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\ Enclosure cc: Distribution attached 5

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. , s i Maihng Aodrest P.O Box 620 futton, MO 65251 L- '

cc distribution for ULNRC- 1545 Mr. Thomas W. Alexion (2 copies) Manager, Electric Department Office of Nuclear Reactor Regulation Missouri Public Service Commission U.S. Nuclear Regulatory Commicsion P. O. Box 360 Mail Stop P-316 Jefferson City, MO 65102 l 7920 Norfolk Avenue i Bethesda, MD 20014 Mr. O. Maynard Wolf Creek Nuclear Operating Corp.

Mr. A. Bert Davis P. O. Box 411 Regional Administrator Burlington, KS 66839 U. S. NucJear Regulatory Commission Region III Mr. Merlin Williams 799 Roosevelt Road Supt. of Regulatory Quality &

Glen Ellyn, IL 60137 Administrative Services 1 Wolf Creek Nuclear Operating Corp. l I

American Nuclear Insurers P. O. Box 411 c/o Dottie Sherman, Library Burlington, KS 66839 The Exchange Suite 245 270 Farmington Avenue Farmington, CT 06032 Records Center Institute of Nuclear Power Operations Suite 1500 1100 circle 75 Parkway Atlanta, GA 30239 NRC Resident Inspector D. F. Schnell (400)

R. J. Schukai (470)

G. L. Randolph J. F. McLaughlin  !

J. E. Davis (Z40SR) ,

(Z40SR) (w/c)

D. W. Capone /R. P. Wendling (470) i F. D. Field (480) f A, P. Neuhalfen j A. C. Passwater/D. E. Shafer/D. J. Walker (470) J G. A. Hughes Z40.03 (QA Record) j J. M. Price 1 W. R. Robinson 2+m.

M. E. Taylor H. Wuertenbaccher, Jr. (100)

S. L. Auston (470)(NSRB)

S. J. Bellers/J. D. Schnack JDB Chrono 3456-0021.6 3456-0260 Z40ULNRC G56.37 N. Date (Sandra Auston) (470) i 1

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SPECIAL REPORT 87-06 ACTUATION OF SEISMIC MONITORING INSTRUMENTATION This Special Report is being submitted to explain circumstances surrounding the declaration of an Unusual Event due to the actuation of seismic monitoring instrumentation on 6/22/87 at 1424 CDT. Technical Specification (T/S) 4.3.3.3.2 requires a report to be submitted when a seismic monitoring instrument is actuated "during a seismic event greater than or equal to 0.01g." The control room annunciator alarm and subsequent declaration of an Unusual Event were not the result of seismic activity. Thus, this event is not required to be reported per T/S 4.3.3.3.2 but is voluntarily reported.

Equipment malfunctions are the probable cause of this actuation.

i This is based upon other recent occurrences of this type and the lack of l correlation between the receipt of the Callaway alarm and the activity detected by outside agencies. Further investigations are underway to determine an exact cause of the malfunctions. The following additional information is provided for the event on 6/22/87:

l EVENT CHRONOLOGY: (6/22/87) l 1424 A " Seismic Recorder On" control room annunciator was received in the control room. The plant was in Mode 1 - Power Operation at 99% reactor power.

1428 The U.S. Geological Survey (USGS) in Denver was contacted to investigate the event.

1431 The St. Louis University Geophysical Observatory (SLUG 0) was contacted.

1437 SLUGO confirmed that seismic activity had been detected but could i

not confirm the origin.

1438 Based on this information, an Unusual Event was declared.

1445 The USGS confirmed that seismic activity had been detected on instrumentation located at French Lick, Missouri, and Southern Illinois.

1459 The USGS called again stating that their instruments indicated probable quarry blasting in the area.

1531 The emergency was terminated after plant tours indicated no visible damage and after confirmation that seismic activity had not occurred at Callaway.

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. SPECIAL REPORT 87-06 On 6/23/87, SLUGO was contacted to seek correlation between the time Callaway Plant's alarm was triggered and the times of the events l SLUGO detected on 6/22/87. SLUGO indicated that at 1415 on 6/22, their instruments detected a possible mine blast in Western Kentucky and at 1430 detected a possible earthquake at a very distant location. Utility 1 analysis of the event found that temporary strip chart recorders in place since the 6/8/87 incident (reference Special Report 87-05; ULNRC-1536) and secondary seismic monitoring " scratch pads" showed no abnormal seismic activity at Callaway Plant. Additionally, when the annunciator was received on the main control board, the seiemic recorder did not energize as expected.

There was no effect on plant safety-related equipment.

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