ML20010A902

Forwards LER 81-112/03L-0.Detailed Event Analysis Encl

ML20010A902
Person / Time
Site:	McGuire
Issue date:	08/05/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010A903	List: ML20010A902 ML20010A907
References
NUDOCS 8108130088
Download: ML20010A902 (3)

Text

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WIL 6f AM O. PA R K E R. J R.

Vice Patsiormt August 5, 1981 TELrenoNE: AngA 704 SvcA a Paoouction 373-4083 6 1IG,f

/4 Mr. J. P. O'Reilly, Director S,\y - p i'/

U. S. Nuclear Regulatory Commission Q -

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Region Il '/

101 Marietta Street,. Suite 3100

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Atlanta, Georgia 30303 ,. g o, commet Re: McGuire Nuclear Station Unit 1 '

Docket No. 50-369

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Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-ll2. This report concerns Technical Specification 3.3.3.8, "The radioactive ' liquid effluent monitoring instrumentation channels shown in Table 3.3-12 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, a a, n -

William O. Parker, Jr.

PBN:krh Attachment i cc: Director Mr. Bill Lavalee l Office of Managunent and Program Analysis Nuclear Safety Analysis Center U. S. Nuclear Regulatory Commission Post Office Box 10412 j Washington, D. C. 20555 Palo Alto, California 94303 Ms. M. J. Graham Resident. Inspector-NRC

[. McGuire Nuclear Station l

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0108130088 810805-PDR ADOCK 05000369'

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McGUIRE NUCLEAR STATION REPORTABLE OCCURRENCE REPORT NUMBER: 81-112 REQUEST DATE: August 5, 1981 OCCURRENCE.DATE: July 6, 1981 FACILITY: McGuire Unit 1, Cornelius, NC IDENTIFICATION OF OCCURRENCE: The composite sampler for the con *ainment ventilation unit condensate drain tank (VUCDT) line was decisted inoperable.

The sampler's flow totalizer. indicated a volume of flow which was obviously in error.

CONDITION PRIOR TO OCCURRENCE: Mode 3, Hot Standby DESCRIPTION OF OCCURRENCE: The Foxboro digital totalizer on the flow-proportional composite sampler.of the VUCDT line failed to provide accurate readings of the amount of contents released from the VUCDT. The system was, therefore, declared inoperable. This was reportable pursuant to Technical Specification 3.3.3.8 and required implementation of Action Statement 32 of Table 3.3-12.

ANALYSIS OF OCCURRENCE: A Foxboro digital flow. totalizer (Model 14A) was recently installed in the VUCDT drain line as part of a required liquid effluent composite sampler package. Initial testing on the sampler package on July 1,1981, determined that every component, with the exception of the flow totalizer, functioned well. The totalizer indicated a. release volume which was approximately six times greater than was actually released. The Shift Supervisor was notified that although the totalizer did not work l correctly, the remainder of the sampler did and, therefore, could be declared operable. Two hours later the VUCDT system was mistakenly declared operable.

On July 5, approximately 2000 gallons were released from the VUCDT via EMF-44 to the condenser circulating water system (RC) discharge. Similarly, a release was initiated on July 6. . Based on the data received from the releases made up to that point in time, the totalizer was declared inoperable. Subse-quent releases of the VUCDT were made (July 7 and 9) by transferring the contents to the floor drain tank (FDT) and into the RC discharge. During this time, a pneumatic fitting on the totalizer was discovered to be leaking, and was subsequently tightened.

On July 10, the totalizer was tested to determine im functional operability following the repair of the pneumatic fitting. The .otalizer still indicated a release volume much greater than which was present and it. continued to indicate flow after the pump was turned off and associated valves closed.

. .v Report Number 81-112

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! The Foxboro totalizer will be replaced with one manufactured by Nbore

Industries. This new integrator should eliminate the problems associated with the Foxboro unit. .It will be. installed upon~its receipt at the

station.

SAFETY ANALYSIS: A representative, composite sample of the volume released was collected as required by Technical Specifications. The total volume was calculated by utilizing the flow. rate. chart recorder vs.-amount of time-released.

Chemical and. radiological analysis confirmed that the contents released were-within specified limits for operation. -Thus, the safe operation of the plant and the health and safety of the public were not affected by this incident.

[ CORRECTION ACTION: The leaking pneumatic fitting was repaired, and although this improved the instrument's performance, it still provided information -that was grossly in error.

Noting that a similar previously identified problem existed.with:the containment sump discharge flow monitor, Duke Power Company will replace both of these gages with a solid state pneumatic conversion integrator from another manufacturer.

To avoid future problems until.the new totalizer is installed, we have decided to transfer all volume of liquidLin the VUCDT to.the FDT, where it is released via EMF-49 through the Liquid Waste System.

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