ML20079D392

Proposed Tech Spec 3/4.2.1 Re Linear Heat Rate

ML20079D392
Person / Time
Site:	Calvert Cliffs
Issue date:	07/02/1991
From:	BALTIMORE GAS & ELECTRIC CO.
To:
Shared Package
ML20079D391	List: ML20079D390 ML20079D392
References
NUDOCS 9107120223
Download: ML20079D392 (2)

Text

'

TECRT BEL.0tJ - co rohc60e( excore defeders, }m 3/4.2 POUER DISTRIBUTION LIM 8TS ConMudan win &a power rnM o BASES W#

• D 3/4.2.1 LINEAR HEAT RATE ThelimitationonlinearheatrateensuresthatintheevgntofaLOCA, the peak temperature of the fuel cladding will not exceed 2200 F.

Either of the two core power distribution monitoring systems, the Excue Detector Monitoring System and the Incore Detector Monitoring System, provide adequate monitoring of the core power distribution and are_ caoable of veri g that the linear beat rate does not exceed its limits J9The W - w - d.

f _EuCyMperfortgfthir function by continuously monitoring the AXIAL

[ SHAPE INDEX G1W-*==N*N wbM y"A = = ' O = = cc--d and vertfying that the AXIAL SHAPE INDEX is maintained within the allowable limits of Figure 3.2-2. In conjunction with the use of the excore monitoring i system and in establishing the AXIAL SHAPE INDEX limits, the following assump-I tions are made: 1) the CEA insertion limits of Specifications 3.1.3.5 and 3.1.3.6 are satisfied, 2) the AZIMUTHAL POWER TILT restrictions of Specifica-tion 3.2.4 are satisfied, and 3) the TOTAL PLANAR RADIAL PEAKING FACTOR does Qnot exceed the limits of Specification 3.2.2.

rmll Incore Detector Monitoring System continuously provides a direct (No - f the peaking factors and the alarms which have been established for the individur' incore detector segments ensure that the peak linear heat rates will be maintained within the allowable limits of Figure 3.2-1. The setpoints for these alarms include allowances, set in the conservative directions, for

1) a measurement-calculational uncertainty factor of 1.062, 2) an engineering uncertainty factor of 1.03, 3) an allowance of 1.002 for axial fuel densifica-tion and thermal expansion, and 4) a THERMAL POWER measurement uncertainty factor of 1.02.

4 3/4.2.2, 3/4.2.3 and 3/4.2.4 TOTAL PLANAR AND INTEGRATED RADIAL PEAKING FACTORS-Fjy AND F4 AND AZIMUTHAL POWER TILT - T q The limitations on FT and T are provided to ensure that the assumptions used in the analysis for e5tablis0ing the Linear Heat Rate and Local Power Density - High LCOs and LSSS setpoints remain valid during operation at the various allowable CEA group insertion limits. The limitations on FT and T are provided to ensure that the assumptions used'in the analysis es[ablish!ng the DNB Margin LCO, and The mal Margin / Low Pressure LSSS setpoints remain valipdur{ngoperationatthevariousallowableCEAgroupinsertionlimits.

,F If F e or Tq exceed their basic limitations, operation may continue under theadditionalrestrictionsimposedbytheACTIONstatementssincethese additional restrictions provide adequate provisions to assure that the assump-Jions uced in establishing the Linear Heat Rate, Thermal Margin / Low Pressure and Local Power Density - High LCOs and LSSS setpoints remain valid. An AZIMUTHAL POWER TILT > 0.10 is not expected and if it sho01d occur, subsequent operation would not be restricted to only tese operations required to identify

,the cause of this unexpected tilt.

t.

CALVERT CLIFFS - UNIT 1 B 3/4 2 1 Amendment No. 33, D , 104 9107120223 910702 POR ADOcK 05000317 P PDR

4, :,,y , , _ - ~w -

ZUSERT' cedro\ ekue\ encore deledors, k ,

MOW Cwinc% OMk Oc power- ratio 3/4.2 POWER DISTRIBUTION LIMITS

)

4 g g BASES 3/4.2.1 LINEAR HEAT RATE The limitation on linear heat rate ensures that in the event of a LOCA, the peak temperature of the fuel cladding wil-1 not exceed 2200*F.

Either of the two core power distribution monitoring systems, the Excore Detector Monitoring System and the Incore Detector Monitoring System, provide adequate monitoring of the core power distribution and are capable of verifyino that the linear heat rate does not exceed its limits.j9The " -

C-susur}'}

( hr nc rc:::a perform #this function by continuously monitoring the AXIAL SHAPE INDEX e.d n - 0;EEEE r=m -

/ _r =t=-----La-f and verifying that the AXIAL SHAPE INDEX is maintained within the allowable limits of Figure 3.2-2. In conjunction _with the use of the excore monitoring

.f system and in establishing the AXIAL (SHAP6/INDEX limits, the following assump- l tions are made: 1) the CEA insertion ~1imits of Specifications 3.1.3.5 and

'}3.1.3.6 are satisfied, 2) the AZIMUTHAL POWER TILT restrictions of Specification 3.2.4 are satisfied, and 3) the TOTAL PLANAR RADIAL PEAKING FACTOR does not

\

exceed the limits of Specification 3.2.2.

=

t/m ily, he Incore Detector Monitoring System continuously provides a direct l l Jeasure of the peaking factors and the alarms which have been established for the individual incore detector segments ensure that the peak linear heat rates will be maintained within the allowable limits of Figure 3.2-1. The setpoints for these alarms include allowances, set in the conservative directions, for

1) a measurement-calculational uncertainty factor of 1.062, 2) an engineering uncertaitity factor of 1.03, 3) an allowance of 1.002 for axial fuel densifica-tion and thermal expansion, and 4) a THERMAL POWER measurement uncertainty 1 i factor of 1.02.

~_y 3/4.2.2, 3/4.2.3 and 3/4.2.4 TOTAL PLANAR AND INTEGRATED RADIAL PEAKING T

FACTORS-Ffy AND F7AND AZIMUTHAL POWER TILT - T o ThelimitationsonFfy and Tq are provided to ensure that the assumptions used in the analysis for establishing the Linear Heat Rate and Local Power Density - High LCOs and LSSS setpoints remain valid during operatico at the I

various allowable CEA group insertion limits. The limitations on F' and T are provided to ensure that the assumptions used in the analysis esEablishing i

the DNB Margin LCO, and Thermal Margin / Low Pressure LSSS setpoints remain valip during operatien at 'the various allowable CEA group insertion limits.

If F exceed their basic limitations, ' operation may continee undeN#orF' ort restrictions imposed by the ACTION statements since tnese the abditio8al additional restrictions provide adequate provisions to assure that the assump-ptions used in establishing the Linear Heat Rate, Thermal Margin / Low Pressure iii+  !

hl CALVERT CLIFFS - UNIT 2 B 3/4 2-1 Amencment No. JE,2J,3E 6 ,p9 123