ML021640237

Cycle 9 Core Operating Limits Report

ML021640237
Person / Time
Site:	Seabrook
Issue date:	05/31/2002
From:	Peschel J North Atlantic Energy Service Corp
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NYN-02055
Download: ML021640237 (19)

Text

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North Atlantic Energy Service Corporation SNorth P.O. Box 300 Northa i

Seabrook, NH 03874 Atlantic (603) 474-9521 The Northeast Utilities System May 31, 2002 Docket No. 50-443 NYN-02055 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 - 0001 Seabrook Station Cycle 9 Core Operating Limits Report North Atlantic Energy Service Corporation (North Atlantic) is enclosing the Cycle 9 Core Operating Limits Report (COLR) for Seabrook Station pursuant to Technical Specification 6.8.1.6.c. Cycle 9 operation of Seabrook Station is scheduled to commence in the near future as North Atlantic is nearing completion of the eighth refueling outage.

Should you require further information regarding this report, please contact Mr. Paul V. Gurney, Manager-Reactor Engineering at (603) 773-7776.

Very truly yours, NORTH ATLANTIC ENERGY SERVICE CORP.

Miager - Regulatory Programs cc:

H. J. Miller, NRC Region I Administrator R.D. Starkey, NRC Project Manager, Project Directorate 1-2 G.T. Dentel, NRC Senior Resident Inspector

ENCLOSURE TO NYN-02055

RE-21 Rev. 01-09-01 Page 1 of 17 CORE OPERATING LIMITS REPORT SEABROOK CYCLE 9 COLR March 2002 RE Supervisor Operations Manager Signature D/2-t /b2 Date

RE-21 Rev. 01-09-01 Page 2 of 17 1.0 Core Operating Limits Report This Core Operating Limits Report for Seabrook Station Unit 1, Cycle 9 has been prepared in accordance with the requirements of Technical Specification 6.8.1.6.

The Technical Specifications affected by this report are:

1) 2.2.1 Limiting Safety System Settings

2) 3.1.1.1 Shutdown Margin Limit for MODES 1, 2, 3, 4

3) 3.1.1.2 Shutdown Margin Limit for MODE 5

4) 3.1.1.3 Moderator Temperature Coefficient

5) 3.1.3.5 Shutdown Rod Insertion Limit

6) 3.1.3.6 Control Rod Insertion Limits

7) 3.2.1 Axial Flux Difference

8) 3.2.2 Heat Flux Hot Channel Factor

9) 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 Limiting Safety System Settings: (Specification 2.2.1) 2.1.1 Cycle Dependent Overtemperature AT Trip Setpoint Parameters and Function Modifier:

2.1.1.1 K1

= 1.180 2.1.1.2 K2

= 0.021 / OF 2.1.1.3 K3

=0.0011/psig T

= Measured RCS T,,g (IF), and T'

= Indicated RCS Tavg at RATED THERMAL POWER (Calibration temperature for AT instrumentation, < 588.5*F ).

P'

= Nominal RCS operating pressure, 2235 psig

RE-21 Rev. 01-09-01 Page 3 of 17 2.1.1.4 Channel Total Allowance (TA) N.A.

2.1.1.5 Channel Z = N.A.

2.1.1.6 Channel Sensor Error (S) = N.A.

2.1.1.7 Allowable Value - The channel's maximum Trip Setpoint shall not exceed its computed Trip Setpoint by more than 0.5% of AT span. Note that 0.5% of AT span is applicable to OTAT input channels AT, Tavg and Pressurizer Pressure; 0.25% of AT span is applicable to AL.

2.1.1.8 f1(AI) is a function of the indicated difference between top and bottom detectors of the power-range neutron ion chambers; with nominal gains to be selected based on measured instrument response during plant startup tests calibrations such that:

(1)

For qt - qb between -20% and +4%, f1(AD) > 0; where qt and qb are percent RATED THERMAL POWER in the upper and lower halves of the core, respectively, and qt + qb is the total THERMAL POWER in percent RATED THERMAL POWER; (2)

For each percent that the magnitude of qt - qb exceeds -20%, the AT Trip Setpoint shall be automatically reduced by Ž 3.1% of its value at RATED THERMAL POWER.

(3) For each percent that the magnitude of qt - qb exceeds +4%, the AT Trip Setpoint shall be automatically reduced by > 2.44% of its value at RATED THERMAL POWER.

See Figure 5.

2.1.1.9 T, > 8 seconds 2.1.1.10 c2 3 seconds 2.1.1.11 T3 =0 seconds 2.1.1.12 t 4 >- 33 seconds 2.1.1.13 cs < 4 seconds 2.1.1.14 16 = 0 seconds

RE-21 Rev. 01-09-01 Page 4 of 17 2.1.2 Cycle Dependent Overpower AT Trip Setpoint Parameters and Function Modifier:

2.1.2.1 K4 1.121 2.1.2.2 K5

=

0.020 / IF for increasing average temperature and K5 = 0.0 for decreasing average temperature.

2.1.2.3 K6

=

0.00175 / OF for T > T" and K6 = 0.0 for T*< T", where:

T

=

Measured Tavg (OF), and T11 Indicated Tavg at RATED THERMAL POWER (Calibration temperature for AT instrumentation, <587.5 OF).

2.1.2.4 Channel Total Allowance (TA) = N.A.

2.1.2.5 Channel Z = N.A.

2.1.2.6 Channel Sensor Error (S) = N.A.

2.1.2.7 Allowable Value - The channel's maximum Trip Setpoint shall not exceed its computed Trip Setpoint by more than 0.5% of AT span. Note that 0.5% of AT span is applicable to OPAT input channels AT and Tvg.

2.1.2.8 f2(AI) is disabled.

2.1.2.9 ul as defined in 2.1.1.9, above.

2.1.2.10

'"C as defined in 2.1.1.10, above.

2.1.2.11 Tx as defined in 2.1.1.11, above.

2.1.2.12 T6 as defined in2.1.1.1 4, above.

RE-21 Rev. 01-09-01 Page 5 of 17 2.1.2.13 T7 > 10 seconds. It is recognized that exactly equal values cannot always be dialed into the numerator and denominator in the protection system hardware, even if the nominal values are the same (10 seconds). Thus given the inequality sign in the COLR (greater than or equal to) the intent of the definition of this time constant applies primarily to the rate time constant (i.e. the Tau value in the numerator). The lag time constant (denominator Tau value) may be less than 10 seconds or less than the value of the numerator Tau value (e.g., if the numerator is set at 10.5, the denominator may be set to 10 or 9.5) and still satisfy the intent of the anticipatory protective feature.

2.2 Shutdown Margin Limit for MODES 1, 2,3, and 4: (Specification 3.1.1.1)

A)

The Shutdown Margin shall be greater than or equal to 1.3% AK/K, in MODES 1, 2, 3.

B)

The Shutdown Margin shall be greater than or equal to 2.2% AK/K, in MODE 4.

2.3 Shutdown Margin Limit for MODE 5: (Specification 3.1.1.2)

The Shutdown Margin shall be greater than or equal to 2.2% AK/K.

2.4 Moderator Temperature Coefficient: (Specification 3.1.1.3) 2.4.1 The Moderator Temperature Coefficient (MTC) shall be less positive than +2.92 x 10-1 AK/K/0F for Beginning of Cycle Life (BOL), All Rods Out (ARO), Hot Zero Thermal Power conditions.

2.4.2 MTC shall be less negative than -5.0 x 10-4 AK/K/°F for End of Cycle Life (EOL), ARO, Rated Thermal Power conditions.

2.4.3 The 300 ppm ARO, Rated Thermal Power MTC shall be less negative than -4.1 x le AK/K/°F (300 ppm Surveillance Limit).

2.5 Shutdown Rod Insertion Limit: (Specification 3.1.3.5) 2.5.1 The shutdown rods shall be fully withdrawn. The fully withdrawn position is defined as the interval within 225 steps withdrawn to the mechanical fully withdrawn position inclusive.

RE-21 Rev. 01-09-01 Page 6 of 17 2.6 Control Rod Insertion Limits: (Specification 3.1.3.6) 2.6.1 The control rod banks shall be limited in physical insertion as specified in Figure 1.

2.7 Axial Flux Difference: (Specification 3.2.1) 2.7.1 The indicated AFD must be within the Acceptable Operation Limits specified in Figure 2.

2.8 Heat Flux Hot Channel Factor : (Specification 3.2.2) 2.8.1 FRTPQ = 2.50 2.8.2 K(Z) is specified in Figure 3.

2.8.3 W(Z) is specified in Figures 4.1 to 4.5 and in Table 1.

The W(Z) data is applied over the cycle as follows:

BU < 150 MWD/MTU, linear extrapolation of 150 and 2000 MWD/MTU W(Z) data 150 < BU < 3500 MWD/MTU, quadratic interpolation of 150, 2000, and 5000 MWD/MTU W(Z) data 3500 < BU < 7000 MWD/MTU, quadratic interpolation of 2000, 5000, and 9000 MWD/MTU W(Z) data 7000 < BU < 16000 MWD/MTU, quadratic interpolation of 5000, 9000, and 16000 MWD/MTU W(Z) data BU > 16000 MWD/MTU, linear extrapolation of 9000 and 16000 MWD/MTU W(Z) data 2.8.4 The FMQ(Z) penalty factor is applied over the cycle as follows:

BU <4350 MWD/MTU, FMQ(Z) penalty factor is 1.020 4350 < BU < 6025 MWD/MTU, FMQ(Z) penalty factor is 1.025 BU > 6025 MWD/MTU, FmQ(Z) penalty factor is 1.020

RE-21 Rev. 01-09-01 Page 7 of 17 2.9 Nuclear Enthalpy Rise Hot Channel Factor: (Specification 3.2.3) 2.9.1 F* < FNH"(RTP) x ( 1 + PF x ( 1 -P))

where P = THERMAL POWER / RATED THERMAL POWER.

2.9.2.a For FNAH measured by the fixed incore detectors:

FNAH(RTP) = 1.585 for the VANTAGE+ fuel F AH(RTP) = 1.536 for the VANTAGE+ (w/IFMs) and RFA fuels 2.9.2.b For FNA measured by the movable incore detectors:

FNwu-(RTP) = 1.587 for the VANTAGE+ fuel FNtAH(RTP) = 1.540 for the VANTAGE+ (w/IFMs) and RFA fuels 2.9.3 Power Factor Multiplier for FNA = PF = 0.3 for all fuel types.

RE-21 Rev. 01-09-01 Page 8 of 17 Figure 1 Control Bank Insertion Limits Versus Thermal Power

RE-21 Rev. 01-09-01 Page 9 of 17 Figure 2 Axial Flux Difference Operating Limits Versus Thermal Power 110 (418,100)

(B,100) 100 UNACCEPTABLE UNACCEPTABLE OoUACPETABLTIONA O

90 OPERATION :

PRTO S80

/1 7

0 70 ACCEPTABLE E

OPERATION 6

S50 n

(-"38,50)

(28 40 30 20 10 0

-60

-50

-40

-30

-20

-10 0

10 20 30 40 50 60 Axial Flux Difference (%DI)

Note: %DI = %AI

RE-21 Rev. 01-09-01 Page 10 of 17 Figure 3 K(Z) Versus Core Height

RE-21 Rev. 01-09-01 Page 11 of 17 Figure 4.1 W(Z) Versus Core Height 150 MWD/MTU 1.40 1.35

1. 30 1.25 S1.20

1. 15 1.10 1.05 1.00 4

5 6

7 8

Core Height (Feet)

RE-21 Rev. 01-09-01 Page 12 of 17 Figure 4.2 W(Z) Versus Core Height 2,000 MWD/MTU 1.40 1.35 1.30 1.25

-A 1.20 1.15

1. 10 1.05 1.00 4

5 6

7 (

t Core Height (Feet)

RE-21 Rev. 01-09-01 Page 13 of 17 Figure 4.3 W(Z) Versus Core Height 5,000 MWD/MTU 1.40 1.35 1.30L 1.25 N

1.20 I. is L 1.10 1.05 1.00 1

o 0

10 11 12 4

5H h

Core Height (Feet)

RE-21 Rev. 01-09-01 Page 14 of 17 Figure 4.4 W(Z) Versus Core Height 9,000 MWD/MTU N

I 7/

I I

I l

0 2

3 4

5 6

7 8

Core Height (Feet)

I I

1i0 1i 12.

1.40 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00 7

RE-21 Rev. 01-09-01 Page 15 of 17 Figure 4.5 W(Z) Versus Core Height 16,000 MWD/MTU 1.40 1.35 1.30 1.25 N

20

1. 15 1.10 N

1.05

1. 00 1

0 2

3 4

5 74 6

7 Core Height (Feet)

'I 8

9 10 121 12 m--

ll:T-

qTll

RE-21 Rev. 01-09-01 Page 16 of 17 Figure 5 fl(AI) Function f (A I),

(percent) 28.59, 60 A I Band (percent)

-50

-40

-30

-20

-10 0

10 20 30 40

RE-21 Rev. 01-09-01 Page 17 of 17 Table 1 W(Z, BU) versus Axial Height HEIGHT (Z)

(Feet)

< 1.60 1.80 2.00 2.20 2.40 2.60 2.80 3.00 3.20 3.40 3.60 3.80 4.00 4.20 4.40 4.60 4.80 5.00 5.20 5.40 5.60 5.80 6.00 6.20 6.40 6.60 6.80 7.00 7.20 7.40 7.60 7.80 8.00 8.20 8.40 8.60 8.80 9.00 9.20 9.40 9.60 9.80 10.00 10.20

Ž 10.40 W(Z,BU) 150 MWDIMTU 1.0000 1.3512 1.3312 1.3102 1.2887 1.2672 1.2437 1.2286 1.22 11 1.2123 1.2045 1.1956 1.1889 1.1843 1.1782 1.1713 1.1638 1.1553 1.1463 1.1363 1.1246 1.1227 1.1317 1.1439 1.1543 1.1639 1.1727 1.1804 1.1864 1.1907 1.1931 1.1937 1.1916 1.1884 1.1897 1.1900 1.1907 1.2002 1.2199 1.2398 1.2566 1.2753 1.2952 1.3148 1.0000 2000 5000 9000 MWD/MTU MWD/MTU MWD/MTU 1.0000 1.0000 1.0000 1.3431 1.3355 1.3270 1.3212 1.3140 1.3088 1.2984 1.2916 1.2898 1.2752 1,2687 1.2702 1.2519 1.2457 1.2504 1.2277 1.2223 1.2303 1.2125 1.2068 1.2152 1.2071 1.2011 1.2068 1.2026 1.1981 1.2013 1.1974 1.1934 1.1947 1.1912 1.1883 1.1883 1.1847 1.1819 1.1825 1.1781 1.1744 1.1765 1.1711 1.1668 1.1696 1.1633 1.1584 1.1620 1.1547 1.1492 1.1537 1.1454 1.1394 1.1445 1.1354 1.1289 1.1348 1.1254 1.1184 1.1243 1.1161 1.1097 1.1140 1.1096 1.1027 1.1125 1.1124 1.1044 1.1200 1.1230 1.1141 1.1302 1.1314 1.1217 1.1388 1.1391 1.1287 1.1467 1.1462 1.1357 1.1552 1.1540 1.1442 1.1641 1.1626 1.1540 1.1723 1.1697 1.1625 1.1791 1.1754 1.1698 1.1844 1.1797 1.1760 1.1882 1.1824 1.1810 1.1902 1.1835 1.1843 1.1907 1.1829 1.1851 1.1893 1.1803 1.1836 1.1856 1.1816 1.1808 1.1834 1.1974 1.1907 1.1843 1.2218 1.2094 1.1885 1.2435 1.2303 1.2094 1.2646 1.2540 1.2299 1.2852 1.2751 1.2457 1.3046 1.2953 1.2669 1.3256 1.3223 1.2982 1.0000 1.0000 1.0000 16000 MWD/MTU 1.0000 1.2906 1.2755 1.2601 1.2451 1.2306 1.2172 1.2082 1.2032 1.1988 1.1941 1.1876 1.1853 1.1856 1.1849 1.1832 1.1804 1.1763 1.1710 1.1649 1.1593 1.1632 1.1738 1.1843 1.1933 1.2010 1.2071 1.2112 1.2133 1.2131 1.2107 1.2061 1.1985 1.1897 1.1840 1.1807 1.1849 1.1950 1.2002 1.2086 1.2201 1.2397 1.2667 1.2943 1.0000