05000325/LER-1982-118-03, /03L-0:on 821026,RTGB Narrow & wide-range Instruments Showed Suppression Pool Level of -29 Inches While Actual Level -26.5 Inches.Caused by Instrumentation Inaccuracies.Instrumentation Recalibr & Pool Level Restored

/03L-0:on 821026,RTGB Narrow & wide-range Instruments Showed Suppression Pool Level of -29 Inches While Actual Level -26.5 Inches.Caused by Instrumentation Inaccuracies.Instrumentation Recalibr & Pool Level Restored

ML20028B823
Person / Time
Site:	Brunswick
Issue date:	11/24/1982
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028B821	List: 05000325/LER-1982-118, Forwards LER 82-118/03L-0 05000325/LER-1982-118-03, /03L-0:on 821026,RTGB Narrow & wide-range Instruments Showed Suppression Pool Level of -29 Inches While Actual Level -26.5 Inches.Caused by Instrumentation Inaccuracies.Instrumentation Recalibr & Pool Level Restored
References
LER-82-118-03L-01, LER-82-118-3L-1, NUDOCS 8212070012
Download: ML20028B823 (1)

LER-1982-118, /03L-0:on 821026,RTGB Narrow & wide-range Instruments Showed Suppression Pool Level of -29 Inches While Actual Level -26.5 Inches.Caused by Instrumentation Inaccuracies.Instrumentation Recalibr & Pool Level Restored

Event date:
Report date:
3251982118R03 - NRC Website

text

NRC FORM 366 U. S. NUCLEAR REGULATCRY COMMISSION (111V. )

W-LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l

l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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7 8 9 LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T l0l11 l L @l 0l 5 l 0 l - l 0 l 3 l 2 l 5 l@l 1 l 0 l 2 l 6 l 8 l 2 @l 1l 1 l 2 l 4 l 8 l 2 l@

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121 l During plant operation. performance of the Suporession Pool Level Indicators Oper-I l o l 3 l l ability Test revealed that the RTGB narrow and wide range instruments showed a pool l

l o l 4 l l level of -29" while the actual level was -26.5".

The specified operating range for l

lo ls] l suppression chamber water level is -27" to -31".

This event did not affect the health l 0 6 l and safety of the public. The inoperability of the subiect_RTGB instrumentation is l

10171 l being reported in LER 1-82-117.

l 101811 Technical Specifications 3.6.2.1, 6.9.1.9b l

80 7

8 9 C DE CODE S BC E COMPONENT CODE SUB dE SU E

l S l Hlh Wh Wh l Il Nl Sl Tl Rl Ulh [_T_jh W h O 9 7

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CODE TYPE N O.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lThe level went out of specification without operator knowledge due to the inaccuracies l i O li li l l in the subject level instrumentation. The instrumentation was recalibrated and I

l suppression pool level was restored to normal. This level instrumentation will be I

i 7 l modified for each unit to provide more reliable indicatioa. A similar event was l

i 3 [i l4 ] l reported in LER 2-82-74.

I 80 7

8 9 SIA S

% POWE R OTHER STATUS OSCO RY DISCOVERY DESCRIPTION NA l l B l@l Periodic Test l

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NuvsER NA l

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7 8 3 11 12 80 LOSS OF OR DAMAGE To FACILt TY TYPE

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8 9 10 g2 2070012 821124 PUBL ICITY NRC USE ONLY pDR ADOCK 05000325 issVEo@ DESCRIPTION IA I

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8 9 10 68 69 80 5 NAME OF PREPARER PHONE:

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