05000219/LER-1981-015-03, /03L-0:on 810324,main Steam Line High Flow Sensors Tripped at Values Greater than Tech Specs Limit.Caused by Instrument Repeatability.Both Sensors Reset

/03L-0:on 810324,main Steam Line High Flow Sensors Tripped at Values Greater than Tech Specs Limit.Caused by Instrument Repeatability.Both Sensors Reset

ML20003G182
Person / Time
Site:	Oyster Creek
Issue date:	04/21/1981
From:	Fitzgerald M JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20003G181	List: 05000219/LER-1981-015, Forwards LER 81-015/03L-0.Detailed Event Analysis Encl 05000219/LER-1981-015-03, /03L-0:on 810324,main Steam Line High Flow Sensors Tripped at Values Greater than Tech Specs Limit.Caused by Instrument Repeatability.Both Sensors Reset
References
LER-81-015-03L, LER-81-15-3L, NUDOCS 8104280440
Download: ML20003G182 (1)

LER-1981-015, /03L-0:on 810324,main Steam Line High Flow Sensors Tripped at Values Greater than Tech Specs Limit.Caused by Instrument Repeatability.Both Sensors Reset

Event date:
Report date:
2191981015R03 - NRC Website

text

NRC FCRM 3M U. S. NUCLEAR RE2ULATERY COMMISSION V(7 771 J

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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a 60 64 OOCK ET NUMB ER 68 69 EVENT QATE 74 75 REPORT CATE 80 EVEN T DESCRIPTION AND PROSA8LE CONSEOUENCES h tc l:I lDuring surveillance testing, the Main Steam Line High Flow Sensors I

l RE-22F and E-22G tripped at values greater than the limit of 5.97.5 psid I

iO,3, echincal Specifica-I io i4i lgiven in Table 3.1.1 Sections B.2 and B.3 of the m i O i s i ; tions. Sensor RE-22F tripped at 101.5 and RE-22G tripped at 99.0.

The I

i C e e t ! safety significance is ccmsidared minimal because the redundant sensors IOI ; iin each circuit, RE-22B and RE-22C would have actuated within the I

i e,a i idesired 1imit to initiate the required main steam isolation functions.

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l i i o l lThe cause was attributed to instrunent receatability. Sensor RE-22F was I i i i loperatino outside of its desian accuraev. and sansnr PR-?2n wan nnave-1 l ng within design accuracy. Both were reset to trip within the required l

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The probleris associated with these senscrs and their setpoints 1

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