ML20010A923

Forwards LER 81-108/03L-0.Detailed Event Analysis Encl

ML20010A923
Person / Time
Site:	McGuire
Issue date:	08/03/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010A924	List: ML20010A923 ML20010A925
References
NUDOCS 8108130117
Download: ML20010A923 (3)

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/\\* 'hkNfh;f(,D - 'j Mr. J. P. O'Reilly, Director /S\ ,

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101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 d ggg 121981* iost 7I Re: McGuire Nuclear Station Unit 1 ~y Docket No. 50-369 .g s\ p a @

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-108. This report concerns Technical Specification 3.3.3.9, "The radioactive gaseous effluent monitoring instrumentation channels shown in Table 3.3-13 shall be operable...". This incident was considered to be of no significance with respect to the health and safety of the public.

Ve truly yours, ,

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William O. Parker, Jr.

PBN:krh Attachment cc: Director Mr. Bill Lavalee Office of Management and Program Analysis Nuclear Safety Analysis Center j U. S. Nuclear Regulatory Commission Post Office Box 10412

Washington, D. C. 20555 Palo Alto, California 94303 Ms. M. J. Graham j Resident inspector-NRC r

McGuire Nuclear Station I

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ss 8108130117 stogog DR ADOCK O .sOO369 PDR

am, o McGUIRE NUCLEAR STATION REPORTABLE OCCURRENCE REPORT NUMBER: 81-108 REPORT DATE: August 3, 1981 OCCURRENCE DATE: July 5, 1981 FACILITY: McGuire Unit 3 Cornelius, NC IDENTIFICATION OF OCCURRENCE: The Condenser Steam Air Ejector radiation monitor, EMF-33, was declared inoperable.

CONDITIONS PRIOR TO OCCURRENCE: Mode 4, Hot Shutdown; prior to initial criticality.

i DESCRIPTION OF OCCURRENCE: On July 5, 1981, Control Room personnel received a loss of flow alarm on EMF-33. Examination of the monitor determired that the vacuum pump had apparently seized. The Shift Supervisor subsequertly declared the monitor inoperable and instructed that the component be repaired. This was reportable pursuant to Technical Specification 3.3.3.9, and necessitated institution of a routine sampling program as stipulated by Action Statement No. 37 of Table 3.3-13. No new work request was written because an outstanding work request already existed, and work was currently being performed on that system as the result of a modification.

On July 8, the vacuum pump was removed.from the monitor and disassembled. . Evidence of moisture was found inside, and the carbon vanes were badly.damaved and had seized to the inside surface of the pump. The pump was cleaned, at oits vanes and bearings replaced. The monitor was returned to service on July 9. Design changes are still being performeu on this equipment,.however, in an attempt to prevent future problems of a similar nature.

l APTARCIT CAUSE: The failure of this equipment was the direct result of a conden-sation being aspirated into the vacuum . pump due to improper drainage.

ANALYSIS OF OCCURRENCE: The failure of EMF-33 as a rasult of excessive amounts of moisture in the system has been a recurrent problem and has been' reported to the NRC six times in the past five months (See R. O. reports 369/81-13, 81-18, 81-21, 81-31, 81-35, and 81-79) .

Duke Power Company has been working for several months in an attempt to resolve the problems associated with excessive amounts of condansation in this system.

To date, our attempts have had only a marginal success in gravitf draining the

' condensation from the monitor (elevation 767') to the Waste Evaporator Feed Tank (elevation 716')# Work is currently in progress to make additional modifications to the drain line which is hoped will eliminate the problems.

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Report Number 81-108 Page 2 CORRECTIVE ACTION: Following che identification and notification of the problem, periodic sampling and analysis was begun as required by the appropriate Action Statement in the Technical Specifications Manual. This sampling was continued as long as the instrument was.out of service.

The damaged pump was repaired by cleaning it and replacing the pump vanes and bearings. The existing Is" I.D. drain line is currently in the process of being replaced with a 1" I.D. drain line. In the performance of this task, all unnecessary bends and angles are being reduced or eliminated in an attempt to further aid flow. Additionally, the current filter / moisture trap is being replaced with a larger one.

SAFETY ANALYSIS: Sample analysis of the Reactor Coolant and the Condenser Steam-Air Ejector Systems confirried that no radiation levels above background were present. Thus, the safe operation of the plant and the health and safety of the public were not affected by this incident.

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