ML20049H606

LER 82-001/03L-0:on 820125,one Overpower Delta T Summing Unit Found Out of Spec.Caused by Foxboro Model 66RC-OL Summing Unit Instrument Drift.Device Recalibr.Evaluation Underway

ML20049H606
Person / Time
Site:	Prairie Island
Issue date:	02/24/1982
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20049H604	List: ML20049H603 ML20049H606
References
LER-82-001-03L, LER-82-1-3L, NUDOCS 8203030355
Download: ML20049H606 (1)

Text

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61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PRO 8ABLE CONSEQUENCES h j l0 l2l l During surveillance test one overoower delta T summinn mrft was found out of I lO la l l specification. The reactor trip signal generated by the channel could have l l0 l4 l l occurred as much as 1.9% high. Redundant channels were Operable. Recent l lOlsl l similar event was RO 79-03. No effect on public health and safety.  !'

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, ltl0ll Instrument drif t in a Foxboro Model 66RC-OL Summing Unit. l i i l Device was immediately recalibrated. An evaluation is being made to determine if I I

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