05000255/LER-1981-019-01, /01T-0:on 810528,during Fuel Vendor Review,Three Radial Peaking Factor Limits Were 1% Nonconservative During Current Cycle.Caused by Vendor Errors in Fuel Cycle Calculations.Surveillance Limits Have Been Revised

/01T-0:on 810528,during Fuel Vendor Review,Three Radial Peaking Factor Limits Were 1% Nonconservative During Current Cycle.Caused by Vendor Errors in Fuel Cycle Calculations.Surveillance Limits Have Been Revised

ML20009B595
Person / Time
Site:	Palisades
Issue date:	06/11/1981
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009B592	List: 05000255/LER-1981-019, Forwards LER 81-019/01T-0 05000255/LER-1981-019-01, /01T-0:on 810528,during Fuel Vendor Review,Three Radial Peaking Factor Limits Were 1% Nonconservative During Current Cycle.Caused by Vendor Errors in Fuel Cycle Calculations.Surveillance Limits Have Been Revised
References
LER-81-019-01T, LER-81-19-1T, NUDOCS 8107160366
Download: ML20009B595 (2)

LER-1981-019, /01T-0:on 810528,during Fuel Vendor Review,Three Radial Peaking Factor Limits Were 1% Nonconservative During Current Cycle.Caused by Vendor Errors in Fuel Cycle Calculations.Surveillance Limits Have Been Revised

Event date:
Report date:
2551981019R01 - NRC Website

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.o Attachnent to LER 31-19 d

Consumers Power Company

- Palisades Nuclear Plant Docket 50-255 Consumers Power Company has been notified by its fuel vendor that the radial' peaking factor limits which are specified in 3.10.3g of the Palisades Technical-Specifications are nonconservative by approximately one percent. The following table sunnarizes the errors:

Peaking Technical Fevised Factor Specification Limit Limit F

1.kS(1.0 + 0.5(1 - P)). l.h3(1.0 + 0.5(1 - P))

F 1.77(1.0 + 0.5(1 - P)) 1.75(1.0 + 0.5(1 - P))

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F 1.66(1.0.+ 0.5(1 - P)) 1.6h(1.0 + 0.5(1 - ?))

A review of the current cycle core operating data was revievel to determine if the revised limits had been exceeded; the review indicated they had not been ex-ceeded. Power distribution surveillance vill be based on the revised limits for the remainder of this operating cycle.

The nonconservatism in the technical specification limits was caused by an error -

in the DNB calculation for H fuel in Cycle.h.

This vas discovered by the fuel vendor during a reviev of the analysis. The error was apparantly caused by the analyst's failure to rec Sgnize that the assembly radial peaking factor limit in the technical specificat ;ons is deff ned on the basis of assembly power and not average linear heat rate within the assembly. This discrepancy caused the assem-fbly power, and hence the peaking factor implied by the analysis, to be about 1%

lever than the corresponding technical specification limits.