ML19332G198

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Rev 0 to, Yankee Cycle 20 Core Operating Limits Rept
ML19332G198
Person / Time
Site: Yankee Rowe
Issue date: 09/30/1989
From:
YANKEE ATOMIC ELECTRIC CO.
To:
Shared Package
ML19332G196 List:
References
NUDOCS 8912200301
Download: ML19332G198 (10)
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{{#Wiki_filter:h 1 l-i g.., 5.: 4-b (1 i s r t I c. i i;-- .i vy' di? Yankee Cycle 20 I Core Operating Limits Report-Revision 0 j -i 'i. 1 b 1 1 I September 1989 j -ib .i j ..). .l a i t i l' i i Controlled Copy No. _ l i l i -7772R 8912200301 891208 PDR ADOCK 05000029 r) rgatn

[7 /A f L/ 89_ b i /)f g _ Prepared By:- U C (Date) c4 /d/9' Ef Approved By: -R/).Cacciappp(i, Manager -(Dge ) y RVactor Physifs Group k!O9 Approved By: % /WM R. K. Sundaram, Manager (Date) Loss-of-Coolant Accident Analysis Group / Y f Approved By: P. A. Bergeron Manager (Dat'e ) ,"4 Transient Ana sis Group Approved By: AA B. C. Slif ', D'irector (Date) Nuclear Eng neering Department -j. I k-i i. l l Yankee Atomic Electric Company Nuclear Services Division 580 Main Street Bolton, Massachusetts 01740 7772R +

f. V: TABLE OF CONTENTS Page ) LIST OF FIGURES................................................... iv 1.0

INTRODUCTION.....................................................

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C"J F ;. 1 1 y, l$ is n .7. ; w y. 1.0 JyTRODUCTION t. 't _o p j Th S. report provides the. cycle-specific limits for operation of the Yankee hu;1 ear Power Station through Cycle 20. It includes the limits ior ~ control rod ~ insertion and reactor power. In'this report, Cycle-20 will-n. ' frequently be referred to as the Present Cycle. If any of these limits are ll, exceeded, the acti9n will be taken as defined in'the Technical Specifications. This report has been prepared'in accordance with the requirements of if ! Technical Specification 6.9.4 The core operating limits have been developed using the NRC-approved methodologies listed in Technical Specification 6.9.4. i L ;- I o, I$I .. } i 4 m E . t 7772R-j J ni

p-s. 2.0 p0RE OPERATING LIMITS ] These Present Cycle operating limits have been defined using j NRC-approved methodologies. The Present Cycle must be operated within the bounds of there limits and all others specifled in the Technical Specifications. l l-2.1 Power Dependent Insertion Limit (PDIM l Figure 1 provides the PD1L. The PD1L is based on the requirements of the steam line break transient analysis and is also an important consideration 4 in the analysis of the loss of coolant flow and boron dilution transients, since it limits the minimum shutdown margin availabic. !? 2.2 Mk, Linear IIcat Generation Rate (LHGR) Figure 2 provides the allowable peak-rod LitCR. Limiting the peak LilGR during Condition 1 events provides assurance that the initial conditions .t-assumed for' the LOCA analyses are met and the ECCS acceptance criteria limits of 100FR50.46 are not exceeded. li 'h '2.3 Xenon Redistribution Multiplier Figure 3 provides the xenon redistribution multiplier. The xenon multiplier was selected to conservatively account for the effect of xenon-redistribution transients on LilGR which can result from control rod motion at full' power.- 2.4 Reduced Power Multiplier - Figure 4 provides the reduced power multiplier. This multiplier was selected to prevent exceeding the allowable LilGR limits within the first few ' hours following return to power after control rod insertion outside the operating band for 100% allowable power as provided in Figure 1. 7772R

? FIGURE 1 POWER DEPENDENT INSERTION LIMIT TECHNICAL SPECIFICATION 3.1.3.5 100 e r 90 = UNACCEPTABLE OPERATION / / '/ 80 - / / 10-r / 6 / h 60 = 9 / l 50 = / o Y 0 49 = h j ACCEPTABLE OPERATION 6 '/ ~ 30 = / 20 = r/ l l 10-0 O 10 20 30 40 50 60 70 80 90 l CONTROL ROD GROUP C POSITION (INCHES WITHDRAWN)

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m i i .j i. L FIGURE 2 ALLOWABLE PEAK ROD LHGR VERSUS CYCLE BURNUP TECHNICAL SPECIFICATION 3.2.1/4.2.1.1 12 i 11 - o FRESH FUEL O EXPOSED FUEL -i 'I w ( ) 5 8e m i g I g9I 5 k 8-5 I I E 3 5 I 4 I I 4 3 I 3 g3 g3 g3 g4 g 3 3 I 1 I I I I I 1 I I I gI gI I I I 5 I 5 1 I 8 1 I I g I I I 3 5 I gI 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 CYCLE BURNUP (GWD/MTU)

.: A s._ i , e, -,.. FIGURE 3 MULTIPLIER FOR XENON REDISTRIBUTION VERSUS CYCLE BURNUP TECHNICAL SPECIFICATION 4.2.1.2 1.1 e ? e i a @ 1.05 - U 5 8 [ g i 2 } a: 1.0 L F e s 9 0.95 - i i i e i i i i i i i i i i i 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 CYCLE BURNUP (GWD/MTU)

,,......i 'l Il ? ' I i l FIGURE 4 MULTIPLIER FOR REDUCED POWER VERSUS CYCLE BURNUP j TECHNICAL SPECIFICATION 4.2.1,2 1.0 t 0 I. (i'l 0.95 - I e ul t n$ s 0.9 ' e t S b 8 e 0.85 - 1 e l l L 0.8 i i i i i i i i i i i i i i i i 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 i CYCLE BURNUP (GWD/MTU) l L f-l l r .}}

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