05000325/LER-1980-073-03, /03L-0:on 801122,RHR Flow Indicator Signal Converter 1-E11-FY-3338 Would Not Respond to Input Signal. Caused by Remote Shutdown Panel RHR Sys Flow Indicator 1-E11-FI-3338 Loading Converter to Give Inaccurate Response

/03L-0:on 801122,RHR Flow Indicator Signal Converter 1-E11-FY-3338 Would Not Respond to Input Signal. Caused by Remote Shutdown Panel RHR Sys Flow Indicator 1-E11-FI-3338 Loading Converter to Give Inaccurate Response

ML19340D371
Person / Time
Site:	Brunswick
Issue date:	12/19/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19340D369	List: 05000325/LER-1980-073, Forwards LER 80-073/03L-0 05000325/LER-1980-073-03, /03L-0:on 801122,RHR Flow Indicator Signal Converter 1-E11-FY-3338 Would Not Respond to Input Signal. Caused by Remote Shutdown Panel RHR Sys Flow Indicator 1-E11-FI-3338 Loading Converter to Give Inaccurate Response
References
LER-80-073-03L-01, LER-80-73-3L-1, NUDOCS 8012300433
Download: ML19340D371 (2)

LER-1980-073, /03L-0:on 801122,RHR Flow Indicator Signal Converter 1-E11-FY-3338 Would Not Respond to Input Signal. Caused by Remote Shutdown Panel RHR Sys Flow Indicator 1-E11-FI-3338 Loading Converter to Give Inaccurate Response

Event date:
Report date:
3251980073R03 - NRC Website

text

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8 64 61 COCK ET NUnggR EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES l During the performance of Remote Shut own RHR System Flow Calibration, P.T. 55.8PC, l

go,2, l the RHR flow indicator signal converter, li-Ell-FY-3338, Moore Industries. Incorp.,

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- o 3 g o,,, l Model No. SRT-/4-20/1-5/45 STD, would not respond to an input signal. Similar events l involving this instrumentation have been reported in LER's 1-79-84, 1-80-47, and l

o s I [77g-} l 1-80-69.

This event did not affect the health or safety of the public.

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JJ J4 JS 36 31 40 41 42 4J 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS ITTTI I An investigation revealed that Renote Shutdown panel RHR Svstem flow indicator 1-E11-l Model No. 1151, was loading the signal con-I W l FI-3338. Siz-a International Instru=ent, The flow indicator movement l l verter such that the indicator response was inaccurate.

, 2 g ] was replaced with a direct replacement and the flow indication loop was successfully l

l l calibrated and returned to service.

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1 1.ER ATT/OIENT - RO # 1-80-73 Facility: BSEP Unit No. 1 Event Date: 11-22-80 i

This event occurred as a result of the previous replacement of the indicator

=eter move =ent,=odel No. 1151-VB-1-5 =a DC, with a modified =eter move =ent of st=ilar specifications until the receipt of a direct replace =ent fro = the manuf acturer (LER l-80-69). The te=porary meter =ove=ent, =edel No.1151-VB-4-20 =a DC, had undergone the following =odifications at the ti=e it was in-stalled: a 247.5 oh=,1%,.25 WATT range resistor installed in series with the =eter movement inside the =eter case. However, as was later discovered as a result of this modification, the i=pedance of the modified =eter was too low and caused loading of the =eter square root converter. The te=po-rarily installed =eter and the =eter square root converter =et the calibra-l tion require =ents of PT 55.SPC following its installation, but due to the lower input i=pedance of the =odified =eter, a higher-than-normal current output fro = the =eter square root converter resulted, which caused a de-gradation in converter perfor=ance over the period of ti=e the te=porary movement was in service. At the ti=e of this event, the direct replace =ent move =ent for this =eter had recently arrived and was, therefore, installed, calibrated and returned to nor=al service. To prevent any future si=ilar events of this nature, the =aintenance engineer involved has been counselled on the necessity for thorough review of equip =ent characteristics prior to sub=itting repair procedures for approval. Flow loop 1-Ell-F1-3338, which is nor= ally calibrated on a quartcrly basis, will be calibrated =onthly for the next three months to ensure the proper operation of this instrument.

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