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Proposed Tech Spec Pages 2.2-1,3.10-9,3.10-12 & 3.10-13,re Reactor Core Safety Limits & Power Dependent Insertion Limit,Supporting Proposed Change 128 for Cycle 10 Operation
	ML20207P530
Person / Time
Site:	Maine Yankee
Issue date:	01/12/1987
From:	; Maine Yankee
To:	;
Shared Package
ML20207P516	List: ML20207P515; ML20207P530; ML20207P536;
References
	NUDOCS 8701160220
	Download: ML20207P530 (5)
	v • d • e

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MAINE YANKEE ATOMIC POWER COMPANY 2.2 SAFETY LIMITS - REACTOR CORE Acolicability Applies to the limiting combinations of reactor power, and Reactor Coolant System flow, temperature, and pressure during operation.

Obiective To maintain the integrity of the fuel cladding and prevent the-release of significant amounts of fission products to the reactor coolant.

Soecifications A. The reactor and the Reactor Protection System shall be operated such that the Specified Acceptable Fuel Design Limit (SAFDL) on the departure frcm nucleate boiling heat flux ratio (DNBR):

DNBR = 1.20 using the YAEC-1 DNB heat flux correlation is not exceeded during normal operation and anticipated operational occurrences.

B. The reactor and the Reactor Protection System shall be operated such that l the SAFDLs for prevention of fuel centerline melting.

A steady-state peak linear heat rate equal to:

Fuel Tvoe LHGR Limits. kw/ft E E E 21.3 20.6 ]

ML 20.9 19.8 ]

, N 22.2 20.9 ]

! P 23.1 22.2 ]

are not exceeded during norr.ial operation and anticipated operational ,

occurrences. The LHGR limit for each fuel type decreases linearly ] I with Core Average Burnup (CAB). The EOC Eurnup for purposes of establishing a linear relationship is 13,500 MHD/MTU CAB. ]

Basis To maintain the integrity of the fuel cladding, thus preventing fission product release to the Primary System, it is necessary to prevent overheating of the cladding. This is accomplished by operating within the nucleate l boiling regime of heat transfer, and with a peak linear heat rate that will not cause fuel centerline melting in any fuel rod. First, by operating within the nucleate boiling regime of heat transfer, the heat transfer coefficient is large enough so that the maximum clad surface temperature is only slightly greater than the coolant saturation temperature. The upper boundary of the nucleate boiling regime is termed " Departure from Nucleate Boiling" (DNB). At this point, there is a sharp reduction of the heat transfer coefficient, which would result in higher cladding temperature and the possibility of cladding failure.

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MAINE YANKEE ATOMIC POWER COMPANY ATTACHMENT D Cycle 10 Core Performance Analysis Report

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