ML19324C164

Revised Special Rept:On 890914,operations Determined That Pressurizer Level Indication in Standby Shutdown Facility Failed Low.Caused by Faulty Pressure Sensing Element.Faulty Transmitter Taken to Vendor for Repair.Transmitter Replaced

ML19324C164
Person / Time
Site:	McGuire, Mcguire
Issue date:	11/02/1989
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 8911150100
Download: ML19324C164 (2)

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Charktte, NC 28242 Nuclear l'rvductwn (70l}173-4531 DUKEPOWER November 2, 1989-U.S. Nuclear Regulatory Commission Document Control Desk

' Washington,'DC '20555-

Subject:

McGuire Nuclear Station, Units 1 and 2 Docket Nos. 50-369 and 50-370 Standby _ Shutdown Facility Special Report, Revision Centlement Pursuant to FSAR Selected Licensee Commitment 16.9-7. Standby Shutdown Facility (SSF), a special report concerning the inoperability of the SSF Pressurizer Level Indication was submitted on October 23, 1989. This revision corrects a typographical error, t

If you have at.y questions, please contact S.E. LeRoy at (704) 373-6233.

Very truly yours, Hal B.-Tucker SEL/467 Attachment f

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Mr. S.D. Ebneter, Administrator Mr. P.K. Van Doorn U.S. Nuclear Regulatory Commission Senior Resident Inspector Region II.

McGuire Nuclear Station 101 Marietta St., NW, Suite 2900 Atlanta, Georgia 30323

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Mr. D.S. Hood, Project Manager INPO Records Center Office of Nuclear Reactor Regulation Suite 1500 U.S. Nuclear Regulatory Commission 1100 Citcle 75 Parkway Washington, DC 20555 Atlanta, Georgie 30339 7 eCx--gy g

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b U.S. Nuclear Regulatory Commission Document Control Desk Docket Nos. 50-369 and 50-370 November 2, 1989 Attachment Duke Power Company McGuire Nuclear Station Standby Shutdown Facility Special Report On September 14, 1989 at 0430, Operations determined that the Pressurizer l

Level Indication in the Standby Shutdown Facility (SSF) had failed low. A work request was written at 1500 to investigate and repair the level indication. All components in the loop were verified correct with the exception of level transmitter 1NCUT5151. Additionally, the remote amp could not be verified correct due to a problem in the wiring harness. The problem was believed to be faulty pressure sensing element. The spare transmitters located in the warehouse could not be calibrated, and no other replacement transmitter could be located. The seventh day of inoperability occurred on September 21, 1989 at 0430.

Level transmitter 1NCLT5151 is a Foxboro Model E13DM split architecture differential pressure transmitter. Split architecture refers to the separate pressure sensing and amplifier component. The pressure sensing element is located in the Annulus, and the remote amplifier is located in the switchgear room located on the 750 ft. elevation of the Auxiliary Building. The Foxboro E13DM is obsolete and no longer availabic from the Foxboro company. Three Foxboro E13DMs located in our warehouse could not be calibrated. Due to the split architecture of these transmitters, there was great difficulty determining which element of the transmitter was at fault.

This problem was compounded by problems in the remote amp wiring harness.

The faulty transmitters were taken to the vendor for repair; however, none of the transmitters would operate satisfactorily. A station problem report was written to replace the Foxboro E13DM with another type transmitter.

McGuire Exempt Variation Notice No. 2055 was written to replace the Foxboro E13Dm with a Barton Model 764 pressure transmitter. The Barton transmitter was installed per work request no. 96999 on October 11, 1989. Operations declared the SSF Pressurizer Level Indication operable the same day.

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