ML20071H902
| ML20071H902 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 07/11/1994 |
| From: | NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO) |
| To: | |
| Shared Package | |
| ML20071H901 | List: |
| References | |
| RE-21, NUDOCS 9407220091 | |
| Download: ML20071H902 (7) | |
Text
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RE-21 CORE OPERATING LIMITS REPORT CYCLE 4 COLR Ve b-7/II/77 RE DEPT SUPERVISOR OPERATIONS MANAGER v
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RE-21 Rev 01-04-00 Page 2 of 7 1.0
' CORE OPERATING LIMITS REPORT The Core Operating Limits Report for Seabrook Station Unit 1, Cycle 4 has been prepared in accordance with the requirements of Technical Specification 6.8.1.6.
The Technical Specifications affected by this report are:
1) 3.1.1.1 Shutdown Margin Limit for MODES 1,2,3,4 2) 3.1.1.2 Shutdown Margin Limit for MODE 5 3) 3.1.1.3 Moderator Temperature Coefficient 4) 3.1.3.5 Shutdown Rod Insertion Limit 5) 3.1.3.6 Control Rod Insertion Limits 6) 3.2.1 Axial Flux Difference 7) 3.2.2 Heat Flux Hot Channel Factor 8) 3.2.3 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 in the following subsections.
These limits have been developed using the NRC-approved methodologies specified in Technical Specification 6.8.1.6.
2.1 Shutdown Margin Limit for MODES 1,2,3, and 4:
(Specification 3.1.1.1) j A)
The Shutdown Margin shall be greater than or equal to 1.3%
1 Ak/k, in MODES 1,2,3.
B)
The Shutdown Margin shall be greater than or equal to 1.7%
Ak/k in MODE 4 2.2 Shutdown Margin Limit for Mode 5:
(Specification 3.1.1.2)
The Shutdown Margin shall be greater than or equal to 1.7% Ak/k.
2.3 Moderator Temperature Coefficient:
(Specification 3.1,1.3) 2.3.1 The Moderator Temperature Coefficient (MTC) shall be less positive than 0 Ak/k/*F for Beginning of Cycle Life (BOL).
All Rods Out (ARO), Hot Zero Thermal Power conditions.
2.3.2 MTC shall be less negative than -4.2 x 10 Ak/k/*F for. End of Cycle Life (EOL), ARO, Rated Thermal Power conditions.
2.3.3 The 300 ppm ARO, Rated Thermal Power MTC shall be less negatite than -3.3 X 10 Ak/k/*F (300 ppm Surveillance Limit).
RE-21 Rev. 01-04-00 Page 3 of 7 i
2.4 Shutdown Rod Insertion Limit:
(Specification 3.1.3.5) 2.4.1 The shutdy-n rods shall be fully withdrawn.
The fully withdrawn position is defined as the interval within 225 steps withdrawn to the mechanical fully withdrawn position i
inclusive.
2.5 Control Rod Insertion Limits:
(Specification 3.1.3.6) j 2.5.1 The control rod banks shall be limited in physical insertion as specified in Figure 1.
2.6 Axial Flux Difference:
(Specification 3.2.1) 2.6.1 The Axial Flux Difference (AFD) Target Band is + 3%, - 12%.
2.6.2 The indicated AFD may deviate outside the required band specified in 2.6.1 (above) at greater than or equal to 50%.
but less than 90% of RATED THERMAL POWER provided the
)
indicated AFD is within the Acceptable Operation Limits as specified in Figure 2.
2.7 Heat Flux Hot Channel Factor: (Specification 3.2.2) 2.7.1 FyP-2.32 2.7.2 K(Z) is specified in Figure 3.
l 0.2 2.7.3 PF y
2.7.4 The F limits for Rated Thermal Power within specific core y
planes shall be:
2.7.4.1 F
(RTP) less or equal to 1.839 for all planes i
ycontaining blanks D + C control rods, j
2.7.4.2
'F (RTP) less than or equal to 1.784 for all y
planes containing bank D control rods.
2.7.4.3 F
(RTP) less than or equal to 1.644 for all y
unrodded planes; and 2.7.4.4 See Figure 4 for a plot of Fn -(Z) x P(REL) versus axial core height.
2.8 Nuclear Enthalpy Rise Hot Channel Factor:
(Specification 3.2.3) 2.8.1 Fj$P-1.490 for the movable incore detector system Fj$P= 1.488 for the fixed incore detector system 2.8.2 PFen - 0. 2 m
RE - 21 Rev. 01 00 Page 4 of 7 Figure 1 Rod Bank Insertion Limits vs. Thermal Power Four-Loop Operation f! (0,286,225)
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RE - 21.
Rev. 01 00 i
Page 5 of 7 Figure 2 Axial Flux Difference Limits as a Function of Rated Thermal Power i
120 i
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RE - 21 Rev. 01 00 Page 6 of 7 Figure 3 K(Z) - Normalized Fq(Z) as a Function of Core Height 1.2 (0.0,1.0 (6.0,1.0) 1 I
(10.8 0.94)
^ 0.8 6f Q
k 0.6 (12.0, 0.65)
E a:OZ b
M 0.4 K(Z)
ELEVATION (Feet) 1.0 0.0 1.0 6.0 0.2 0.94 10.8 0.65 12.0 BASIS:
FOT = 2.32 0
0 2
4 6
8 10 12 CORE HEIGHT (FEET)
RE - 21 Rev. 01 00 Page 7 of 7 Figure 4 Maximum [Fq x P(REL)] vs. Core Height 2.4 I
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