ML20010H441

Forwards LER 81-141/03L-0.Detailed Event Analysis Encl

ML20010H441
Person / Time
Site:	McGuire
Issue date:	09/15/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010H442	List: ML20010H441 ML20010H447
References
NUDOCS 8109240470
Download: ML20010H441 (2)

Text

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.,C DUKE POWER COMPANY POWER BUILDINO 422 SouTn Cnuncu Sraser, Ciunt.orre, N. C. esa4a } 'y

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WI LLI AM O. PAR K E R, J R, Vier Patsiornt TtttPuoN E:AatA 704 sium paooucv,w September 15, 1981 373-4o83 Mr. J. P. O'Reilly, Director U. S. Nuclear Regulatory Commission / \ >/,

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101 Marietta Street, Suite 3100

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Atlanta, Georgia 30303 g4 g sa'p/, ,,f

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Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-141. This report concerns T.S.3.3.3.4, "The Meteorological Monitoring Instrumentation Channels r

Shown in Table 3.3~8 Shall be Operable." This incident was considered to be of no significance with respect to the health and safety of the public.

Ver 'truly yours, ,

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William O.

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Park.r, Jr PBN/smh Attachment cc: Director Mr. Bill Lavalee Office of Management and . ogram Analysis Nuclear Safety Analysis Center U. S. Nticlear Regulatory C ission Post Office Box 10412 Washington, D. C. 20555 Palo Alto, California 94303 Ms. M. J. Graham Resident Inspector-NRC McGuire Nuclear Station

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McGUIRE NUCLEAR STATION REPORTABLE OCCURRENCE

' REPORT NUMBER: 81-141 REPORT DATE: September 15, 1981

OCCURRENCE DATE

August 16 and 25, 1981 FACILITY: McGuire Unit 1; Cornelius, N.C.

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i. IDENTIFICATION OF OCCURRENCE: The Station Meteorological Monitoring System'(EEB)

{ was declared inoperable when the Control Room annunciator alarm, " Environmental.

System Trouble", was actuated.

i CONDITIONS PRIOR TO OCCURRENCE: On August'16 the plant was in Mode 2, Startup, and on August 25 the plant was in Mode 3, Hot Standby. During the interim period the plant was undergoing low power testing operations with periodic shutdowns for main-tenance activity.

DESCRIPTION OF OCCURRENCE: On August 16, the Station heteorological Monitoring System was declared inoperable upon receipt of a trouble alarm. A technician was dispatched to investigate the' problem, but before he could determine a cause the alarm cleared. The system was then determined to be operating satisfactorily ,

and was declared operable the same day.

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c. The Environmental Systen-Trouble alarm again occurred on August 25. The alarm cleared, but continued to reoccur allowing an opportunity for troubleshooting.

APPARENT CAUSE OF OCCURRENCE: Theproblemwasdeterminedtobean(unstablepower 4 supply in the Meteorological Research, Inc. (MRI) Data Logger.

ANALYSIS OF OCCURRENCE: It is assumed that the August 16 incident was an early sign of the Data Logger power supply failure. Although the power supply continued to function, by August 25 it had deteriorated enough to allow recognition of its instability.

SAFETY ANALYSIS: Three gaseous waste releases made while the system was_ inoperable were monitored and were never above prohibitive radioactivity 1cvels. ~Therefore, the health and safety of the public were not affected by these incidents.

CORRECTIVE ACTION: The MRI Data Logger power supply, model 301-15-0, was(replaced The system was declared operable on andtheinstrumentationwaslrecaliorated.

August 26, 1981.

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