ML20155J955
| ML20155J955 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 10/31/1998 |
| From: | HOUSTON LIGHTING & POWER CO. |
| To: | |
| Shared Package | |
| ML20155J935 | List: |
| References | |
| NUDOCS 9811130048 | |
| Download: ML20155J955 (9) | |
Text
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AttachneM to CAS-96-308 l
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Nuclear Operating Company MNT 4
i SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION UNIT 2 CYCLE 7 l
CORE OPERATING LIMITS REPORT i
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October 1998 l
9811130048 981102 PDR ADOCK 05000499 P
PDR _
Core Operating Limits Report Page I of 9
SottrH TEXAS UNrr 2 CYCLE 7 OCTOBER 1998 j
1.0 CORE OPERATING LIMITS REPORT This Core Operating Limits Report for STPEGS Unit 2 Cyde 7 has been prepared in accordance with the requirements of Technical Specification 6.9.1.6. The core operating limits have been developed using l
the NRC-approved methodologies specified in Technical Specification 6.9.1.6.
i The Technical Specifications affected by this report are:
1) 3/4.1.1.3 MODERATOR TEMPERATURE COEFFICIENT LIMITS 2) 3/4.1.3.5 SHUTDOWN ROD INSERTION LIMITS 3) 3/4.1.3.6 CONTROL ROD INSERTION LIMITS 4) 3/4.2.1 AFD LIMITS 5) 3/4.2.2 HEAT FLUX HOT CHANNEL FACTOR 6) 3/4.2.3 NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR 2.0 OPERATING LIMITS The cycle-specific parameter limits for the specifications listed in Section 1.0 are presented below.
2.1 MODERATOR TEMPERATURE COEFFICIENT (Specification 3.1.1.3):
2.1.1 The BOL, ARO, MTC shall be less positive than the limits shown in Figure 1.
4
- 2.1.2 The EOL, ARO, HFP, MTC shall be less negative than -6.12 x 10 Ak/k/*F.
4 2.1.3 The 300 ppm, ARO, HFP, MTC shall be less negative than -5.22 x 10 Ak/k/*F (300 ppm Surveillance Limit).
where: BOL stands for Beginning-of-Cycle Life EOL stands for End-of-Cycle Life ARO stands for All Rods Out HFP stands for Hot Full Power (100% RATED THERMAL POWER)
HFP vessel average temperature is 589 'F Core Operating Limits Report Page 2 of 9
SOUTH TEXAS UNrr 2 CYCLE 7 OCTOBER 1908 2.2 ROD INSERTION LIMITS (Specification 3.1.3.S and 3.1.3.6):
2.2.1 All banks shall have the same Full Out Position (FOP) of at least 254 steps withdrawn but not exceeding 259 steps withdrawn.
2.2.2 The Control Banks shall be limited in physical insertion as specified in Figure 2.
2.2.3 Individual Shutdown bank rods are fully withdrawn when the Bank Demand Indication is at the FOP and the Rod Group Height Limiting Condition for Operation is satisfied
)
(T.S. 3.1.3.1).
2.3 AXIAL FLUX DIFFERENCE (Specification 3.2.1):
2.3.1 AFD limits as required by Technical Specification 3.2.1 are determined by CAOC Operations with an AFD target band of +3, -12%.
2.3.2 The AFD shall be maintained within the ACCEMABLE OPERATION portion of Figure 3, as required by Technical Specifications.
2.4 HEAT FLUX HOT CHANNEL FACTOR (Specification 3.2.2):
2.4.1 F RTP = 2.55.
q 2.4.2 K(Z) is provided in Figure 4.
2.4.3 The F,y limits for RATED THERMAL POWER (F,yRTP) within specific core planes shall be:
2.4.3.1 Less than or equal to 2.102 for all core planes containing Bank "D" control rods, and 2.4.3.2 Less than or equal to the appropriate core height-dependent value from Table 1 for all unrodded core planes.
2.4.3.3 PF,y = 0.2.
These F,y limits were used to confirm that the heat flux hot channel factor F (Z) will be q
limited by Technical Specification 3.2.2 assuming the most-limiting axial power distributions expected to result for the insertion and removal of Control Banks C and D during operation, including the accompanying variations in the axial xenon and power distributions, as described in WCAP-8385. Therefore, these F,y limits provide assurance that the initial conditions assumed in the LOCA analysis are met. along with the ECCS acceptance criteria of 10 CFR 50.46.
Core Operating Limits Report Page 3 of 9
)
. g south TEXAS UNrr 2 CYctE 7 OCTOBER 1998
, For Unit 2 Cycle 7, the L(Z) penalty is not applied (i.e., L(Z) = 1.0 for all core elevations).
2.5 ENTHALPY RISE HOT CHANNEL FACTOR (Specification 3.2.3):
Standard Fuel VANTAGE SH / RFA Fuel j
2.5.1 F RTP = 1.49.
FmRTP = 1.557.
AH PF n = 0.3.
PF n = 0.3.
2.5.2 a
3
3.0 REFERENCES
3.1 Letter from N. R. Metcalf (Westinghouse) to Dave Hoppes (STPNOC), " Unit 2 Cycle 7 Core Operating Limits Reports," 98TG-G-0064 (ST-UB-NOC-1840), October 12, 1998.
3.2 NUREG-1346, Technical Specifications, South Texas Project Unit Nos. I and 2.
Core Operating Limits Report Page 4 of 9
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SOUTH TEXAS UNrr 2 CYct.I 7 OCTOBER 1998 w
Figure 1 MTC versus Power Level 70 hhfkhhMN$IEkNbbNh$$Nhh)
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9 Tif5b$$$b UNACCEPTABLEOPERATION 60 50 wer -mw am ;
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2.0
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ACCEPTABLE OPERATION H
l 2
l1 1.0 l
0.0 i
l l
-1.0
-2.0 1
-3.0 0.0 20.0 40.0 60.0 80.0 100.0 Relative Power (%)
Core Operating Limits Report Page 5 of 9 4
S south TEXAS UNrr 2 CYCu 7 OCTOBER 1998 Figu m 2 4
Contrul Rod Insertion Limits
- versus Power Level fPower, POP):
Overlan (23,259): 122 Step overlap
):
op W orlap e
260
/
g
/
(22,256): 119 Step Overlap
/
r,/
(21,254): 117 Step overlap
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r 240
/
r
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/
fPower. FOP 1: Overlan
/
(79,259): 122 Step overlap
/,r I
/
(79,258): 121 Step Overlap I
220 j
j (78,256): 119 Step overlap
/
/
(77,254): 117 Step overlap j
d0,202 l
/
200
/
180 l100,174 F j
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A q
160 j
5 f
innux c i j
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140 y
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120 g
j-f g
t o
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f a
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100 g
j g
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f
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IBANK D I
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f 80
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2 16,651
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60 r
1
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5 40 7
/
/
r 20
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/
r
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,29,01 0
O 10 20 30 40 50 60 70 80 90 100 RELATIVE POWER (%)
Contal Bank A is already withdrawn to Full Out Position.
Core Operating Limits Report Page 6 of 9
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SOUTH TEXAS UNTT 2 CYCLE 7 OC10BER 1998 Figure 3 AFD Limits versus Rated Thermal Power 120 100 l-11,90l l11,901
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UNACCEPTABLE y
UNACCEPTABLE OPERATION
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T OPERATION J
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u i
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3 o
(
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f h
0 60 a
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h e
ACCEPTABLE t
j OPERATION g
I-31,50!
!31,50!
40 20 0
-50
-40
-30
-20
-10 0
10 20 30 40 50 Flux Difference (AI) %
Core Operating Limits Report Page 7 of 9 l
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SOUTH TEXAS UNrr 2 CYCLE 7 OCrOBER 1998 Figure 4 K(Z) - Nonnalized F (Z) versus Core Height n
1.2 E'
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0 2
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Core Elevation FQ K(Z) i
@ 04 0.0ft 2.55 1.0 W
7.0 ft 2.55 1.0 l
14.0 ft 2.359 0.925 E
OJ Z
0 0.0 7.0 14.0 CORE HEIGHT (FT) l l
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Core Operating Limits Report Page 8 of 9
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SOUTH TEXAS UNrr 2 CYCLE 7 OCIOBER 1998 Table 1 Unrodded F,7 for Each Core Height
- Core Height Unrodded Core Height Unrodded F.M (Ft.)
F.
(Ft.)
14.000 3.M 6.800 1.
'3.800 3.125 6.600 1.907 13.600 2.793 6.400 1.909 13.400 2.453 6.200 1.911 13.200 2.193 6.000 1.909 13.000 2.032 5.800 1.905 12.800 1.987 5.600 1.904 12.600 1.975 5.400 1.907 12.400 1.983 5.200 1.916 l
12.200 1.985 5.000 1.923 12.000 1.994 4.800 1.929 11.800 2.007 4.600 1.926 11.600 2.029 4.400 1.923 11.400 2.024 4.200 1.924 l
11.200 2.000 4.000 1.927 11.000 1.949 3.800 1.937 10.800 1.918 3.600 1.951 10.600 1.899 3.400 1.945 10.400 1.892 3.200 1.929 10.200 1.889 3.000 1.908 10.000 1.886 2.800 1.886 9.800 1.883 2.600 1.862 9.600 1.878 2.400 1.844 9.400 1.872 2.200 1.831 9.200 1.866 2.000 1.816 9.000 1.861 1.800 1.805 8.800 1.857 1.600 1.788 8.600 1.855 1.400 1.786 8.400 1.854 1.200 1.777 8.200 1.857 1.000 1.779 8.000 1.862 0.800 1.8%
7.800 1.872 0.600 2.113 7.600 1.884 0.400 2.381 7.400 1.895 0.200 2.643 7.200 1.901 0.000 2.893 7.000 1.903 l
For Unit 2 Cycle 7, the L(Z) penalty is not applied (i.e., L(Z) = 1.0 for a!! core elevations).
I Core Operating Limits Report Page 9 of 9