ML19327B627

Special Rept:On 890909,determined That Pressurizer Level Indication in Standby Shutdown Facility Failed Low.Caused by Faulty Pressure Sensing Element.Faulty Transmitters Taken to Vendor for Repair.Barton Transmitter Installed

ML19327B627
Person / Time
Site:	McGuire, Mcguire
Issue date:	10/23/1989
From:	Tucker H DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 8911030014
Download: ML19327B627 (2)

Text

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DUKE POWER GOMPANY l P.O. DOX 33889 '

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' I CHAR Arrw N.O. 98948 ,

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< i i  : October 23, 1989  :

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, . U.S. Nuclear Regulatory Comission -

-> Document Control Desk '

Washington, DC 20555 x '

Subject:

McGuire Nuclear Station, Units 1 and 2 i Docket Nos. 50-369 and 50-370 i Standby Shutdown Facility Special Report  :

. l

[ ' Gentlemen:

Pursuant to FSAR Selected Licensee Comitment 16.9-7, Standby Shutdown Facility (SSF).. find attached a tpecial report concerning the inoperability of the SSF  :

Pressurizer Level Indication.

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

Very truly yours,-  !

h .

lal E.' Tucker'  !

SEL/467 l l ,

Attachment

' xc Mr. S.D. Ebneter, Administrator Mr. P.K. Van Doorn ,

U.S. Nuclear Regulatory Comission NRC Senior Resident Inspector l

i. Region II McGuire Nuclear Station i 101 Marietta St. , NW, Suite 2900  ?

' Atlanta, Georgia 30323 l'

Mr. 'D.S. Hood, Project Manager INPO Records Center Office of Nuclear Reactor Regulation Su'.te 1500 ,

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- U.S. Nuclear Regulatory Comission n 00 Circle 75 Parkway ,

t Washington, DC 20555 Atlanta, Georgia 30339

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, f I I' '8911030014 891023 9

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I. ;< U.S. Nuc1 car Regulatory Commission  ;

Document Control Desk i Docket Nos. 50-369 and 50-370 j October 23, 1989 t

Attachment '

Duke Power Company ,

McGuire Nuclear Station l Standby Shutdown Facility Special Report I

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On September 9, 1989 at 0430, Operations determined that the Pressurizer 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  ;

l' L components in the' loop were verified correct with the exception of level L transmitter INCLT5151. Additionally, the remote amp could not be verified correct l due to a problem in the wiring harness. The problem was believed to be faulty pressure sensing element. The spare trans,.iitters located in the warehouse could not be calibrated, and no other replacement transmitter could be located. The '

i 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 Annt.lus, 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 available 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 repairs however, none of the transmitters would operate satisfacterily. A stat'on problem report was written to replace the Foxboro E13DM with another type transmitter. McGuire Exempt i 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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