ML19208D873

LER 79-043/01T-0:on 790911,C-E Informed Util That Curve Coordinates Were Nonconservative at 80% Rated Thermal Power. Caused by Ambiguous Rendering of Curve Resulting in Issuance of Nonconservative Tech Specs.Correct Curve Used

ML19208D873
Person / Time
Site:	Calvert Cliffs
Issue date:	09/24/1979
From:	Lippold W, Minalcik J BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19208D874	List: ML19208D873 ML19252A288
References
LER-79-043-01T, LER-79-43-1T, NUDOCS 7910010442
Download: ML19208D873 (1)

Text

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REPORT CATE S DOCKET NUMBER EVENT DESCRIPTION AND PROB ACLE CONSEQUENCES h t o 12i i At about 1630 on 9/11/79, Combustion Engineering (CE) informed the Plant Nuclear I g o i3; i Engineer that Technical Specification Figure 3.2-4 was non-concervative in that I j o p l l the curve's coordinates at 80" rated therinal power should be + .30 instead ofy i v

ioi3j g .35 ASI units. A review of all ASI data recorded on plant computer If4 CORE type- 1 o s l writer since this cycle start-up confirms that the reactor has been operated within i j o l,i l the more conservative, correct limits. ' Consequently, the plant has been operated I g g within the scope of the safety analysis. '

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l C DE CODE SUBC E

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.- SE OUE NTI AL OCCURRENCE REPORT - REVISION L EVENT YEAR REPORT NO. . CODE TYPE

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^74 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h is o l An ambicuity in'the rendering of the curve on Ficure 3.2-4. initiated by CE in I

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1 i Isupport of Cycle Four Operation, was not clarified durino the chain nf reviews. 1 J -[ '

g , g,i lbetween CE, BG&E, and NRC and'resulted in the issue of a n'on-conservative TechnicalP l'-

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3 3 l Specification by NRC. Plant Operations staff will use the correct and more  ; 1' "'I e

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g , p i l conservative curve in lieu of Fiaure 3.2-4 until correct curve is issued by NRC. I f 3 g -

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NAME OF PREPARER *

• i ippold/J. A. Mihalcik pd (301) 234-7984