ML19270H020

LER 79-035/03L-0 on 790521:during Startup from Refueling Outage,Disccovered That Mod to Rod Lock Monitor Was Neither Approved Nor Installed.Mod Approved & Installed.Procedures Being Written to Prevent Recurrence

ML19270H020
Person / Time
Site:	Brunswick
Issue date:	06/15/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19270H016	List: ML19270H015 ML19270H020
References
LER-79-035-03L-01, LER-79-35-3L-1, NUDOCS 7906220375
Download: ML19270H020 (2)

Text

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1. 8 60 61 DOCF.E T NUMBE n 68 69 EVENT DATE 75 HEPORT DATE 80 EVEuT DESCRIPTION AND PROHABLE CONSEQUENCES h o 2 l During a normal plant startup following a refueling outage, it was discovered that I o a iplant modification 79-056 on the Unit 2 Rod Block Monitor (RBM) had not been fully l o 4 approved or installed. This modification revise _ the RBM upscale trip from l o s - (.66 Wg + 40) to - (.66 Wd + 39). Investigation revealed that an APRM calibration l 0 6 l performed at 367, power (the approximate preset power level for RBM auto-bypass above l o 7 l which RBM is required ) set the APRM's conservatively by s e veral percent power, con- l 9o a j sequently keeping the effective RBM setpoint within Technical Specification (con't) 1 7 8 9 80 SYSTEM C AlibE CAUSE COMP valve CODE CODE SUBLODE COYPONENT CODE SUBCODE SUBCODE JT51 8

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o When discovered, the plant was in a shutdown condition. The modification was approvedi t i [i j and installed. A procedure is now being written which will ensure that future i 7 loccurences of this nature do not happen. Personnel responsible for this oversight I i 3 have been counseled on the consequences of their actions. I i 4I l l 8 9 80 STA 5 NPOAEH OTHEH S T A1US is r F DISCOVE HY DESCHIF TION

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I LER CONTINUATION -- RO# 2-79-035 Facility: BSEP Unit No. 2 Event Date: 5-21-79 limits. Total time above 307. power was approximately 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, with the highest power approximately 487..

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