05000029/LER-1976-010-01, /01T-0:on 760830,during Review of Core 12 Analysis,Error Found in Figure 8-1 of Tech Specs.Caused by Gamma Heating Correction Omitted by Error in Application of Computer Codes

/01T-0:on 760830,during Review of Core 12 Analysis,Error Found in Figure 8-1 of Tech Specs.Caused by Gamma Heating Correction Omitted by Error in Application of Computer Codes

ML19343B092
Person / Time
Site:	Yankee Rowe
Issue date:	09/13/1976
From:	Boutwell R YANKEE ATOMIC ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19343B091	List: 05000029/LER-1976-010, Forwards LER 76-010/01T-0 05000029/LER-1976-010-01, /01T-0:on 760830,during Review of Core 12 Analysis,Error Found in Figure 8-1 of Tech Specs.Caused by Gamma Heating Correction Omitted by Error in Application of Computer Codes
References
LER-76-010-01T, LER-76-10-1T, NUDOCS 8012040204
Download: ML19343B092 (2)

LER-1976-010, /01T-0:on 760830,during Review of Core 12 Analysis,Error Found in Figure 8-1 of Tech Specs.Caused by Gamma Heating Correction Omitted by Error in Application of Computer Codes

Event date:
Report date:
0291976010R01 - NRC Website

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[ 0191 113 1716 l EVENT CATE REPORT CATE 7 8 57 58 59 60 61 68 69 74 75

EVENT DESCRIPTION

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COCE CCMPONENT CODE E l: 1Zl W lZlZlZlZlZlZl (Zj lZl9l9l9l

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m.ATON 7 89 10 11 12 17 43 44 CAUSE DESCRIPTION 47 48 [Tne accarent cause of this event was the inadverta 7 89 l to account for the fact that gamma enerev is not included in the UiGR 3

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KA OTHEA STATUS OGCOVERY OGCOVERY OESCRPTCN 7 8 9

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PERSONNEL INJUA:ES 80

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EVENT DESCRIPTION

On August 30, 1976 during a review of the Core XII analysis and in preparation for Core XIIIanalysis, an error was discovered in Fig. 8-1 of the Technical Specification D.2.c.1.

This curve delineates the alldiable peak WGR and was found to be non-conservative by 2.7%.

The allowable peak W GR culve, Fig. 8.1 as originally evaluated did not include a correction for the fact that only.0.973 of the heat is generated in the fuel (P.C. 125 Table 6-1) and'0.027 is due to gamma energy. Therefore, on applying the 0.973 multiplier, so that the curve will be consistent with measured numbers, the curve (Fig.'8.1) will be reduced by 2.7%.

To detemine whether the Mf/FT limits were actually exceeded, the measured data for Core XII was re-examined. The re-examination j

shows that the correct limiting WGR has been exceeded only for i

12 days out of the 221 power days of operation from startup of Core XII to August 30, 1976. During those 12 days (which occurred in June,1976) the actual peak WGR was between 10.24 and 10.41 Mf/FT.

t compared to the correct limit of 10.22 (Mf/Fr.

From INCORE run YR-XII-13 covering the period-of interest, it was found that only 4 fuel rods cut of 17734 in the core were in excess of the correct limiting W GR for each of the 12 days.

The plant load was reduced immediately by 2.7% in order to correct for this error.

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