ML20066B766

Updated RO 369/82-66:on 820903 & 16,flow Totalizer Declared Inoperable.Caused by Leaking Pump Discharge Check Valve & out-of-calibr Flow Transmitter.Check Valve Repaired & Transmitter Calibr

ML20066B766
Person / Time
Site:	McGuire
Issue date:	10/28/1982
From:	Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
RO-369-82-66, NUDOCS 8211090182
Download: ML20066B766 (2)

Text

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DUKE POWER GOMPANY P.O. BOX 33180 CHARLOTTE, N.C. 28242 HALH. TUCKER TELEPHONE VEE PREStDent (704) 373-4531 NEMEAR PB4MMTTION October 28, 1982 33

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Mr. James P. O'Reilly, Regional Administrator Sy y33 U. S. Nuclear Regulatory Commission

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Re: McGuire Nuclear Station Unit 1 s_

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Docket No. 50-369 cAs

Dear Mr. O'Reilly:

The following is additional information relating to Reportable Occurrence Report R0-369/82-66 which was submitted by Mr. H. B. Tucker's letter of September 10,.

1982. The original report is still applicable.

R0-369/82-66 reported failures of the Ventilation Unit Condensate Drain Tank (VUCDT) Flow Totalizer in which the totalizer either failed to count during a VUCDT to Condenser Circulating Water (RC) release, or continued to count slowly after termination of a release. Since those failures were reported the following failures have occurred:

1) The Flow Totalizer was declared inoperable on September 3,1982 after it continued to count following termination of a VUCDT to RC release. The totalizer worked properly on subsequent releases and was declared operable on September 7, 1982.

2) The totalizer was declared inoperable on September 16, 1982 when the totalizer was again observed to be counting while no release was in progress (discharge pumps off and outlet valves closed).

The immediate corrective action in both cases was to calculate release volumes using pump head curves. Troubleshooting activities after the Septembar 3 incident revealed a leaking pump discharge check valve that may have allowed discharge header water to drain back into the VUCDT, causing improper totalizer operation.

To prevent drainback through any path, Operating Procedure " Pumping VUCDT to the RC Discharge" was changed to close the VUCDT Outlet Valve immediately after shutting off the discharge pumps. The leaking pump discharge check valve was repaired.

The totalizer functioned properly from September 7 until September 16.

The September 16th failure was determined to be a result of the flow transmitter (Barton) being out of calibration, possibly due to oil found in the pneumatic p 8211090182 821028

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e Jamea P. O'Reilly October 28, 1982 Page 2 transmitter's nozzle. The oil was cleaned out and the transmitter calibrated.

The totalizer was declared operable on October 16, 1982, and is currently functioning properly.

l As stated in R0-369/82-66, a final report will be submitted when the exact l

causes and a long-term solution are identified and corrected.

Very truly yours, s

[8. h a r kg Hal B. Tucker PBN:jfw cc: Director INPO Records Center Office of Management and Program Analysis 1100 Circle 75 Parkway, Suite 1500 U. S. Nuclear Regulatory Commission Atlanta, Georgia 30339 Washington, D. C.

20555 Mr. P. R. Bemis Senior Resident Inspector - NRC McGuire Nuclear Station l

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