ML20140B542

Proposed Tech Spec Changes Implementing Relaxed Axial Offset Control

ML20140B542
Person / Time
Site:	Wolf Creek
Issue date:	01/20/1986
From:	KANSAS GAS & ELECTRIC CO.
To:
Shared Package
ML20140B540	List: ML20140B535 ML20140B542
References
TAC-60559, NUDOCS 8601270039
Download: ML20140B542 (16)

Text

{{#Wiki_filter:.. _ _. _. _. l J Attachment III i 1 Technical Specification Changes Applicable after 8000 BGiDhtTU of Cycle 1 I Wolf Creek Generating Station, Unit No. 1 i 4 i 1 ) 1 2 i 4 1 1 h I 8601270039 e60120 PDR ADOCK 05000482. PDR P i m -m-r.m -.,v re, --,,..~...-.- ..m-....-,..,y, -..e,

New Section For Af ter 8000 MWD /MTU In Cycle 1

3/4.2 POWER DISTRIBUTION LIMITS 3/4.2.1 AXIAL FLUX DIFFERENCE (AFD) LIMITING CONDITION FOR OPERATION 3.2.1 The indicated AXIAL FLUX DIFFERENCE (AFD) shall be maintained within the allowed operational space defined by Figure 3.2-1. APPLICABILITY: MODE 1 ABOVE 50 PERCENT RATED THERMAL POWER

• ACTION:

a. With the indicated AXIAL FLUX DI?FERENCE outside of the Figure 3.2-1

limits, 1.

Either restore the indicated AFD to within the Figure.3.2-1 limits within 15 minutes, or 2. Reduce THERMAL POWER to less than 50% of RATED THERMAL POWER within 30 minutes and reduce the Power Range Neutron Flux - High Trip setpoints,to less than or equal to 55 percent of RATED THERMAL POWER within the next 4 hours.

b. THERMAL POWER shall not be increased above 50% of RATED THERMAL POWER unless the indicated AFD is within the Figure 3.2-1 limits SURVEILLANCE REQUIREMENTS 4.2.1.1 The fndicated AXIAL FLUX DIFFERENCE shall be determined to be within its limits during POWER OPERATION above 50 percent of RATED THERMAL POWER by:

a. Monitoring the indicated AFD for each OPERABLE excore channel:

1. At least once per 7 days when the AFD Monitor Alarm is OPERABLE, and 2. At least once per hour for the first 24 hours after restoring the AFD Monitor Alarm to OPERABLE status. b. Monitoring and logging the indicated, AXIAL FLUX DIFFERENCE for each OPERABLE excore channel at least once per hour for the first 24 hours and at least once per 30 minutes thereafter, when the AXIAL FLUX DIFFERENCE Monitor Alarm is inoperable. The logged values of the indicated AXIAL FLUX DIFFERENCE shall be assumed to exist during the interval preceding each logging. 4.2.1.2 The indicated AFD shall be considered outside of its limits when at least 2 OPERABLE excore channels are indicating the AFD to be outside the limits.

• See Special Test Exception 3.10.2 WOLF CREEK -UNIT 1 3/4 2-1

l New Figure For After 8000 MWD /NTU In Cycle 1

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-50 -30 10 0 10 30 50 FLUX DIFFERENCE ( M ) % FIGURE 3.2-1 WOLF CREEK UNIT 1 AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF RATED THERMAL POWER

Modifications to 3/4.2.1 and Figure 3.2-1

REPLACE WITH NEW SECTION AFTER 8000 MWD /MTU IN CYCLE 1 3/4.2 POWER DISTRIBUTION LIMITS 3/4.2.1 AXIAL FLUX DIFFERENCE LIMITING CONDITION FOR OPERATION .2 3. 1 The indicated AXIAL FLUX DIFFERENCE (AFD) shall be maintained withi the ollowing target band (flux difference units) about the target flux diffe nce: a. 5% for core average accumulated burnup of less than or e al to 000 MWD /MTU, and b. + , -12% for core average accumulated burnup of great than 300 MWD /MTU. The indicate AFD may deviate outside the above require target band at greater than or eq-1 to 50% but less than 90% of RATED THF 3AL POWER provided the indicated AFD is.ithin the Acceptable Operation Limi of Figure 2.2-1 and the cumulative pen Ity deviation time does not exce 1 hour during the previous 24 hours. The indicated AFD may viate outside the abov required target band at greater than 15% but less tha 50% of RATED THERM POWER provided the cumulative penalty deviation time does no exceed I hour d ing the previous 24 hours. APPLICABILITY: MODE 1 above 15% o RATED TH MAL POWER *. ACTION: a. With the indicated AFD outsi of the above required target band and with THERMAL POWER greater t or equal to 90% of RATED THERMAL POWER, I within 15 minutes, either: 1. Restore the in cated AF to within the above required target band mits, or 2. Reduce THE AL POWER to less an 90% of RATED THERMAL POWER. b. With the indicat AFD outside of the above equired target band for more than 1 ho of cumulative penalty devia 'on time during the previous 24 h rs or outside the Acceptable Op ation Limits of Figure 3.2-and with THERMAL POWER less than 9 but equal to or greater th n 50% of RATED THERMAL POWER, reduce: 1. THERMAL POWER to less than 50% of RATED T RMAL POWER within 30 minutes, and g The Puwer Range Neutron Flux - High Setpoin to less than or equal to 55% of RATED THERMAL POWER within e next 4 hours. ^See Spec ~al Test Exception Specification 3.10.2.

1. Surve' lance testing of the Power Range Neutron Flux Channel may be perfo ed purs nt to Specification 4.3.1.1 provided the indicated AFD is maintained thin the cceptable Operation Limits of Figure 3.2-1.

A total of 16 hours operati m be accumulated with the AFD outside of the above required target band duri ( sting without penalty deviation. WOLF CREEK - UNIT 1 3/4 2-1

REPLACE WlTH NEW SECTION AFTER 8000 MWD /MTV IN CYCLE 1 ~ POWER DISTRIBUTION LIMITS LIMITING CONDITION FOR OPERATION inued) N the indicated AFD outside o above required target c. band fo e than 1 hour umulated penalty deviation time during the pre s ours and with THERMAL POWER less than 50% but great ian of RATED THERMAL POWER, the THERMAL POWER not be increase ual to or greater than 50% of THERMAL POWER until the in d AFD is within the above required target band. S QUIREMENTS 4. 1.1 The indicated AFD shall be determined to be within its limits dur' g POWE OPERATION above 15% of RATED THERMAL POWER by: Monitoring the indicated AFD for each OPERABLE excore chan 1: a. 1 At least once per 7 days when the AFD Monitor Alar is OPERABLE, and 2) A least once per hour for the first 24 hours after restoring the FD Monitor Alarm to OPERABLE status. b. Monitoring d logging the indicated AFD for ach OPERABLE excore channel at le t once per hour for the fir 24 hours and at least once per 30 min es thereafter, when the D Monitor Alarm is inoperable. The ged values of the dicated AFD shall be assumed to exist during the 'nterval precedi each logging. 4.2.1.2 The indicated AFD shall consid ed outside of its target band when two or more OPERABLE excore channel are ndicating the AFD to be outside the target band. Penalty deviation outsi of the above required target band shall be accumulated on a time basis of: a. One ninute penalty dev~ tion for ch 1 minute of PGWER OPERATION outside of the targe band at THERM POWER levels equal to or above 50% of RATED THER POWER, and b. One-half minut enalty deviation for ea 1 minute of POWER OPERATION outside of t target band at THERMAL POWE levels between 15% and 50% of RAT THERMAL POWER. 4.2.1.3 The tar t flux difference of each OPERABLE excor channel shall be determined by asurement at least once per 92 Effective Ful Power Days. The provisio of Specification 4.0.4 are not applicable. 4.2.1.4 e target flux difference shall be updated at least once er 31 Eff tive Full Power Days by either determining the target flux ference purs 'nt to Specification 4.2.1.3 above or by linear interpolation bet en the recently measured value and 0% at the end of the cycle life. The mo t ovisions of Specification 4.0.4 are not applicable. WOLF CREEK - UNIT 1 3/4 2-2 b

i I REPLACE WITH NEW FIGURE AFTER 8000 MWD /MTU IN CYCLE 1 f / e ag s 4 ) g O E

1. E E

100 UNACCEPTABL (-11,90) (11, 90) NACCEPTABLE e OPERATION OPERATION a 2 80 a 42 E O ACCEPTAB PERATION e* E O (-31, 50) (31,50) a 5 <0 o. 20 0 -40 -30 20 10 0 10 20 30 40 50 FLUX DIFFERENCE Iall% e FIGURE 3.2-1 AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION OF RATED THERMAL POWER j l WOLF CRLEK - UNIT 1 3/4 2-3

Modifications to Table 2.2-1 I

TABLE 2.2-1 (Continued) TABLE NOTATIONS (Continued) 9 NOTE 1: (Continued) A 7 T' 588.5 F (Nominal T,yg at RATED THERMAL POWER); E K = 3 0.000671; Z Pressurizer pressure, psig; P = ~ 2235 psig (Nominal RCS operating pressure); P' = Laplace transform operator, s 1; S = and f (al) is a function of the indicated difference between top and bottom detectors of the t power-range neutron ion chambers; with gains to be selected based on measured instrument response during plant STARTUP tests such that: -27% (i) for q A between-)5G(and+7%,f(AI)=0,whereq and q are percent y DiUEES t b 3 t b m MINIED RATED THERMAL POWER in the top and bottom halves of the core respectively, and q +q is i F(R RAOC t b total THERMAL POWER in percent of RATED THERMAL PCWER; e i aro 1 -27*4 FEU' (ii) for each percent that the magnitude of q q exceeds-))5k,theATTripSetpoint IN CELE t b s shall be automatically reduced by 37t6%:of its value at RATED THERMAL POWER; and 1.57 % (iii) for each percent that the magnitude of q q exceeds +7%, the aT Trip Setpoint t b shall be automatically reduced by 1.05% of its value at RATED THERMAL POWER. NOTE 2: The channel's maximum Trip Setpoint shall not exceed its computed Trip Setpoint by more than 3.3%~of AT span. P a N-

l 1 Modifications to B 3/4.2.1 and Figure B 3/4.2d

3/4.2 POWER DISTRIBUTION LIMITS BASES The specifications of this section provide assurance of fuel integrity during Condition I (Normal Operation) and II (Incidents of Moderate Frequency) events by: (a) maintaining the minimum DN8R in the core greater than or equal to 1.30 during normal operation and in short-term transients, and (b) limiting the fission gas release, fuel pellet temperature, and cladding mechanical properties to within assumed design criteria. In addition, limiting the peak linear power density during Condition I events provides assurance that the initial conditions assumed for the LOCA analyses are met and the ECCS acceptance criteria limit of 2200 F is not exceeded. The definitions of certain hot channel and peaking factors as used in these specifications are as follows: F (Z) Heat Flux Hot Chanr.el Factor, is defined as the maximum local 9 heat flux on the surface of a fuel rod at core elevation Z divided by the average fuel rod heat flux, allowing for manufacturing tolerances on fuel pellets and rods; F Nuclear Enthalpy Rise Hot Channel Factor, is defined as the ratio of g the integral of linear power along the rod with the highest integrated power to the average rod power; and F (Z) Radial Peaking Factor, is defined as the ratio of peak power density to average power density in the horizontal plane at core elevation Z. 3/4.2.1 AXIAL FLUX DIFFERENCE DELETE Af0 The its on AXIAL FLUX DIFFERENCE (AFD) assure that t 9(Z) upper bound REPLACE WITH I N envel pe f 2. times the normalized axial peaking fa r is not exceeded A AFTER during either norma eration or in the event of on redistribution following 8000 p wer changes.

• D/MTU IN CYCLE 1 Target flux difference is ermi at equilibrium xenon conditions.

The full-length rods may be positioned hin the core in accordance with their respective insertion limits and ould inserted near their normal position for steady-state operation igh power le s. The value of the target flux difference obtained und hese conditions divi by the fraction of RATED THERMAL POWER is th arget flux difference at RAT HERMAL POWER for the associated core rnup conditions. Target flux differen for other THERMAL POWER levels e obtained by multiplying the RATED THERMAL ER value by the appr iate fractional THERMAL POWER level. The periodic u ting of the get flux dif ference value is necessary to reflect core burnu siderations. ( WOLF CREEK - UNIT 1 B 3/4 2-1 I

e POWER DISTRIBUTION LIMITS BASES A FLUX DIFFERENCE (Continued) Alt ugh it is intended that the plant will be operated with th FD within the rget band required by Specification 3.2.1 about the get flux differen during rapid plant THERMAL POWER reductions, c trol rod motion will caus the AFD to deviate outside of the target b d at reduced THERMAL POWER leve This deviation will not affect the non redistribution sufficiently to chang the envelope of peaking factors ich may be reached on a subsequent return RATED THERMAL POWER (with AFD within the target band) provided the time du tion of the deviation

• limited.

Accordingly, a 1-hour penalty deviation lim cumulative durin he previous 24 hours is DELETE provided for operation outside the target nd but within the limits of Figure 3.2-1 while at THERMAL POW 1evels etween 50% and 90% of RATED THERMAL POWER. For THERMAL POWER levels Nt e 5% and 50% of RATED THERMAL POWER, deviations of the AFD outside of the et band are less significant. The penalty of 2 hours actual time ref ts t 's reduced significance. Provisions for monitorin he AFD on an a omatic basis are derived from the plant process computer rough the AFD Monit Alarm. The computer determines the 1-minute erage of each of the OPE LE excore detector outputs and provides an alarm ssage immediately if the AFD r two or more OPERABLE ( excore channels are utside the target band and the THE L POWER is greater than 90% of RATE HERMAL POWER. During operation at THER L POWER levels between 50% a 90% and between 15% and 50% RATED THERMAL P0 , the computer outputs an arm message when the penalty deviation accumulates eyond the limits o hour and 2 hours, respectively. igure B 3/4.2-1 shows a typical monthly target band. 3/4.2.2 and 3/4.2.3 HEAT FLUX HOT CHANNEL FACTOR, and RCS FLOWRATE AND NUCLEAR ENTHALPY RISE HOT CHANNEL FACTOR The limits on heat flux hot channel factor, RCS flowrate, and nuclear enthalpy rise hot channel factor ensure that: (1) the design limits on peak local power density and minimum DNBR are not exceeded, and (2) in the event of a LOCA the peak fuel clad temperature will not exceed the 2200 F ECCS acceptance criteria limit. Each of these is measurable but will normally only be determined periodically as specified in Specifications 4.2.2 and 4.2.3. This periodic surveillance is sufficient to insure that the limits are maintained provided: a. Control rods in a single group move together with no individual rod insertion differing by more than + 12 steps, indicated, from the group demand position, t b. Control rod groups are sequenced with overlapping groups as described in Specification 3.1.3.6, WOLF CREEK - UNIT 1 B 3/4 2-2

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-20% -10% 0 +10% +20% +3 INDICATED AXIAL FLUX DIFFERENCE FIGURE B 3/4.2-1 TYPICAL IflDICATED AXIAL FLUX DIFFERE'1CE VERSUS TilERftAL POWER .iOLF CREEK - Uti!T 1 B 3/4 2-3

F INSERT A 3/4.2.1 AXIAL FLUX DIFFERENCE (AFD) The limits on AXIAL FLUX DIFFERENCE assure that the r (Z) upper bound I envelope of F times the normalized axial paaking factor is not exceeded during either normal operation or in the event of xenon redistribution following power changes. Provisions for monitoring the AFD on an automatic basis are derived from the plant process computer through the AFD Monitor Alarm. The computer determines the one minute average of each of the OPERABLE excore detector outputs and provides an alarm message immediately if the AFD for at least 2 of 4 or 2 of 3 OPERABLE excore channels are outside the AFD limits and the THERMAL POWER is greater than 50 percent of RATED THERMAL POWER.}}