ML20073B458
| ML20073B458 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/16/1994 |
| From: | SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML20073B444 | List: |
| References | |
| NUDOCS 9409220021 | |
| Download: ML20073B458 (19) | |
Text
.
ATTACHMENT A EXISTING TECHNICAL SPECIFICATIONS AND BASES UNIT 2 i
I 9409220021 940916
{DR ADOCK 05000361 PDR
3/4.2 PCWER DISTRIBUTION LIMITS 3/4.2.1 LINEAR HEAT RATE LIMITING CONDITION F00 OPERATION 3.2.1 The linear heat rate shall not exceed 13.9 kw/ft.
APPLICABILITY:
MODE 1 above 20% of RATED THERMAL POWER.
ACTION:
With the linear heat rate exceeding its limits, as indicated by either (1) the COL 55 calculated core power exceeding tht COL 55 calculated core power operating limit based on kw/ft; or (2) when the COL 55 is not being used, any OPERABLE Local Power Density channel exceeding the linear heat rate limit, within 15 minutes initiate corrective action to reduce the linear heat rate to within the limits and eitner:
i Restore the linear heat rate to within its limits within one hour, a.
or b.
Be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
SURVEILLANCE REQUIREMENTS 4.2.1.1 The provisions of Specification 4.0.4 are not applicable.
4.2.1.2 The linear heat rate shall be catermined to be within its limits when THERMAL POWER is above 20% of RATED THERMAL POWER by continuously monitorin; the core power distribution with the Core Operating Limit Supervisory System (COL 55) or, with the COL 55 out of service, by verifying at least once per.
2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> that the linear heat rate, as indicated on all OPERABLE Local Power Density channels, is within the limit of 13.9 kw/ft.
i 4.2.1.3 At least once per 31 days, the COL 55 Margin Alarm shall be verified to actuate at a THERMAL POVER level less than or : qual to the core power operating limit based on kw/ft.
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l 5AN ONCFRE, UNIT 2 3/4 2-1 FEB i 7 ilf!
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3/4.2 POWER DISTRIBUTION LIMITS BASES 3/a.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 will not exceed 2200'F.
Either of the, two core power distribution monitoring systems, the Core Operating Limit Supervisory System (COLSS) and the Local Power Density channels in the Core Protection Calculators (CPCs), provide adequate monitoring of the core power distribution and are capable of verifying that the linear heat rate does not exceed its its limits. The COL 55 performs this function by continuously monitoring the core power distribution and calculating a core power operating limit corresponding to the allowable peak linear heat rate. Reactor operatien at or below this calculated power level assures that the limits of 13.9 kw/ft are not exceeded.
The COL 55 calculated core power and the COL 55 calculated core power operating limits based on linear heat rate are continuously monitored and displayed to the operator. A COL 55 alarm is annunciated in the event that the core power exceeds the core power operating limit. This provides adequate margin to the linear heat rate operating limit for normal steady state opera-
' tion. Normal reactor power transients or equipment f ailures which do not require a reactor trip may result in this core power operating limit being exceeded.
In the event this occurs, COL 55 alarms will be annunciated.
If the event which causes the COL 55 limit to be exceeded results in conditions which approach the core safety limits, a reactor trip will be initiated by the Reactor Protective Instrumentation. The COL 55 calculation of the linear heat rate includes appropriate penalty factors which provide, with a 95/95 probability / confidence level, that the maximum linear heat rate calculated by COL 55 is conservative with respect to the actual maximum linear heat-rate existing in the' core. These penalty factors are determined from the uncer-tainties associated with planar radial peaking measurement, engineering design f actors, axial densification, software algorithm modelling,' computer processing, rod bow and core power measurement.
Parameters required to maintain the operating limit power level based on linear heat rata, margin to DNB and total core power are also monitored by the CPCs assuming minimum core power of 20% RATED THERML POWER. The 20% Rated-Thermal Power threshold is due to the neutron flux detector system being inaccurata below 20% core power. Core noise level at low power is too large to obtain usable detactor readings. Therefore,'in the event that the COL 55 is not being used, operation within the limits.of Figure 3.2-2 can be maintained by utilizing a predetermined local power density. margin and a total core power
' limit in the CPC trip channels. The above listed uncertainty penalty factors plus'those associated with startup test acceptance criteria are also includec in the CPCs.
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0 ATTACHMENT B EXISTING TECHNICAL SPECIFICATIONS AND BASES UNIT 3 s
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3/4.2 POWER DISTRIBUTTON LIMITS Jg 3/4.2.1 LINEAR HEAT RATE 4;
?h LIMITING CONDITION FOR OPERATION 4
y 3.2.1 The linear heat rate shall not exceed 13.9 kw/ft.
~
APPLICABILITY: MODE 1 above 20% of RATED THERMAL POWER.
ACTION:
E With the linear heat rate exceeding its limits, as indicated by either (1) the i
COLSS calculated core power exceeding the COLSS calculated core power operating limit based on kw/ft; or (2) when the COLSS is not being used, any OPERABLE Local Power Density channel exceeding the linear heat rate limit, within 15 minutes initiate corrective action to reduce the linear heat rate to within the limits and either:
Restore the linear heat rate to within its limits within one hour, a.
or b.
Be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
. O suaver u*"cs arou'ae e"'s 4.2.1.1 The provisions of Specification 4.0.4 are not applicable.
4.2.1.2 The linear heat rate shall be determined to be within its limits when THERMAL POWER is above 20% of RATED THERMAL POWER by continuously monitoring the core power distribution with the Core Operating Limit Supervisory System (COLSS) or, with the COLSS out of service, by verifying at least once per 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> that the linear heat rate, as indicated on all OPERABLE Local Power Density channels, is within the limit of 13.9 kw/ft.
4.2.1.3 At least once per 31 days, the COLSS Margin Alam shall be verified 0
to actuate at a THERMAL POWER level less than or equal to the core power f
operating limit based on kw/ft.
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$AN ONOFRE-UNIT 3 3/4'2-1 se
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~s 3/4.2 POWER DISTRIBUTION LIMITS
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BASES g
p 3/4.2.1 LINEAR HEAT RATE The limitation on linear heat rate ensures that in the event of a LOCA, a
the peak temperature of the fuel cladding will not exceed 2200*F.
?
y Either of the two core power distribut' ion monitoring systems, the Core
~
Operating Limit Supervisory System (COLSS) and the Local Power Density channels in the Core-Protection Calculators-(CfCs-), provide adequate monitoring of the i
core power distribution and ar2 capable of verifying that the linear heat rate does not exceed its its limits.
The COLSS performs this function by continuously monitoring the core power distribution and calculating a core power operating limit corresponding to the allowable peak linear heat rate.
Reactor operation i
at or below this calculated power level assures that the limits of 13.9 kw/ft are not exceeded.
The COLSS calculated core power and the COLSS calculated core power operating limits based on linear heat rate are continuously monitored and displayed to the operator.
A COLSS alarm is annunciated in the event that the core power exceeds the core power operating limit. This provides adequate i
margin to the linear heat rate opcrating limit for normal steady state opera-tion.
Normal reactor power transients or equipment failures which do not
-]
require a reactor trip may result in this core power operating ifait being-exceeded.
In the event this occurs, COLSS alarms will be annunciated.
If the event which causes the COLSS limit to be exceeded results in conditions lwhich approach the core safety limits, a reactor trip will be initiated by the Reactor Protective Instrumentation.
The COLSS calculation of the linear heat rate includes appropriate penalty factors.which provide, with a 95/95' probability / confidence level, that the maximum linear heat rate calculated by COLSS is conservative with respect to the actual maximum linear heat rate existing'in the core.
These penalty factors are determined from the uncer-tainties associated with planar radial peaking seasurement, engineering design factors, axial densification, software algoriths modelling, computer processing, rod bow and core power measurement.
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Parameters required to maintain the operating lief t power level based on 3
L linear heat rate, margin to DN8 and total core power are also monitored by the
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p CPCs assiming einimum core power of 20% RATED THERMAL POWER. The 205 Rated p,-
Thermal Power threshold is due to the neutron flux detector system being inaccurate below 20% core power.
Core noise level at low power is.too large s
f!
to obtain usable detector readings. Therefore, in the event that the COLSS is not being used, operation within the limits of Figure 3.2-2 can be maintained by utilizing a predetermined local power density margin and a total core power limit in.the CPC trip channels.
The above listed uncertainty penalty factors plus those associated with startup test acceptance criteria are also included in the CPCs.
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j SAN ONOFRE-UNIT 3 8 3/4 2-1 i
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ATTACHMENT C PROPOSED TECHNICAL SPECIFICATIONS AND BASES UNIT 2
3/4.2 POWER DISTRIBUTION LIMITS 3/4.2.1 LINEAR HEAT RATE LIMITING CONDITION FOR OPERATION 3.2.1 The linear heat rate shall not exceed 44 4 13;0 kw/ft.
APPLICABILITY: MODE 1 above 20% of RATED THERMAL POWER.
ACTION:
With the linear heat rate exceeding its limits, as indicated by either (1) the COLSS calculated core power exceeding the COLSS calculated core power operating limit based on kw/ft; or (2) when the COLSS is not being used, any OPERABLE Local Power Density channel exceeding the linear heat rate limit, within 15 minutes initiate corrective action to reduce the linear heat rate to within the limits and either:
a.
Restore the linear heat rate to within its limits within one hour, or b.
Be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
SURVHILLANCE REQ,UIREMENTS 4.2.1.1 The provisions of Specification 4.0.4 are not applicable.
4.2.1.2 The linear heat rate shall be determined to be within its limits when THERMAL POWER is above 20% of RATED THERMAL POWER by continuously monitoring the core power distribution with the Core Operating Limit Supervisory System (COLSS) or, with the COLSS out of service, by verifying at least once per 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> that the linear heat rate, as indicated on all OPERABLE Local Power i
Density channels, is within the limit of 44,4 13.0 kw!ft.
4.2.1.3 At least once per 31 days, the COLSS Margin Alarm shall be verified to actuate at a THERMAL POWER level less than or equal to the core power operating limit based on kw/ft.
1 i
SAN ONOFRE-UNIT 2 3/4 2-1 AMENDMENT NO.
l 1
3/4.2 POWER DISTRIBUTION LIMITS 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 will not exceed 2200. *F.
i Either of the two core power distribution monitoring systems, the Core Operating Limit Supervisory System (COLSS) and the Local Power Density channels in the Core Protection Calculators (CPCs), provide adequate monitoring of the core power distribution and are capable of verifying that the linear heat rate does not exceed its its limits. The COLSS performs this function by continuously monitoring the core power distribution and calculating a core power operating limit corresponding to the allowable peak l
linear heat rate.
Reactor operation at or below this calculated power level assures that the limits of 44ve 13^0 kw/ft are not exceeded.
The COLSS calculated core power and the COLSS calculated core power operating limits based on linear heat rate are continuously monitored and displayed to the operator. A COLSS alarm is annunciated in the event that the core power exceeds the core power operating limit. This provides adequate margin to the linear heat rate operating limit for normal steady state opera-tion.
Normal reactor power transients or equipment failures which do not require a reactor trip may result in this core power operating limit being r,xceeded.
In the event this occurs, COLSS alarms will be annunciated.
If the event which causes the COLSS limit to be exceeded results in conditions which approach the core safety limits, a reactor trip will be initiated by the Reactor Protective Instrumentation. The COLSS calculation of the linear heat rate includes appropriate penalty factors which provide, with a 95/95 probability / confidence level, that the maximum linear heat rate calculated by COLSS is conservative with respect to the actual maximum linear heat rate existing in the core. These penalty factors are determined from the uncer-tainties associated with planar radial peaking measurement, engineering design factors, axial densification, software algorithm modelling, computer processing, rod bow and core power measurement.
Parameters required to maintain the operating limit power level based on linear heat rate, margin to DNB and total core power are also monitored by the CPCs assuming minimum core power of 20% RATED THERMAL POWER.
The 20% Rated Thermal Power threshold is due to the neutron flux detector system being inaccurate below 20% core power.
Core noise level at low power is too large to obtain usable detector readings. Therefore, in the event that the COLSS is not being used, operation within the limits of Figure 3.2-2 can be maintained by utilizing a predetermined local power density margin and a total core power limit in the CPC trip channels. The above-listed uncertainty penalty factors plus those associated with startup test acceptance criteria are also included in the CPCs.
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9 SAN ONOFRE-UNIT 2 B 3/4 2-1 AMENDMENT NO.
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ATTACHMENT D i
i PROPOSED TECHNICAL SPECIFICATIONS AND BASES t
UNIT 3 i
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3/4.2 POWER DISTRIBUTION LIMITS 3/4.2.1 LINEAR HEAT RATE LIMITING CONDITION FOR OPERATION 3.2.1 The linear heat rate shall not exceed M,4 13 0 kw/ft.
APPLICABILITY: MODE 1 above 20% of RATED THERMAL POWER.
i ACTION:
With the linear heat rate exceeding its limits, as indicated by either (1) the i
COLSS calculated core power exceeding the COLSS calculated core power operating limit based on kw/ft; or (2) when the COLSS is not being used, any OPERABLE Local Power Density channel exceeding the linear heat rate limit, within 15 minutes initiate corrective action to reduce the linear heat rate to within the limits and either:
a.
Restore the linear heat rate to within its limits within one hour, or b.
Be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
SURVEILLANCE REQUIREMENTS 4.2.1.1 The provisions of Specification 4.0.4 are not applicable.
4.2.1.2 The linear heat rate shall be determined to be within its limits when l
THERMAL POWER is above 20% of RATED THERMAL POWER by continuously monitoring the core power distribution with the Core Operating Limit Supervisory System (COLSS) l or, with the COLSS out of service, by verifying at least once per 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> that i
the linear heat rate, as indicated on all OPERABLE Local Power Density channels, l
I is within the limit of H,413,0 kw/f t.
4.2.1.3 At lesst once per 31 days, the COLSS Margin Alarm shall be verified to actuate at a THERMAL POWER level less than or equal to the core power operating limit based on kw/ft.
I i
SAN ONOFRE - UNIT 3 3/4 2-1 AMENDMENT NO.
1
3/4.2 POWER DISTRIBUTION LIMITS BASES 3/4.2.1 LINEAR HEAT RATE 7he limitation on linear heat rate ensures that in the event of a LOCA, the peak temperature of the fuel cladding will not exceed 2200 "F Either of the two core power distribution monitoring systems, the Core Operating Limit Supervisory System (COLSS) and the Local Power Density channels in the Core-Protection Calculators- (CPCs), provide adequate monitoring of the
[
core power distribution and are capable of verifying that the linear heat rate does not exceed its its limits.
The COLSS performs this function by continuously monitoring the core power distribution and calculating a core power operating limit corresponding to the allowable peak linear heat rate.
Reactor operation at or below this calculated power level assures that the limits of 44 G 13.0 kw/ft are not exceeded.
The COLSS calculated core power and the COLSS calculated core power operating limits based on linear heat rate are continuously monitored and displayed to the operator. A COLSS alarm is annunciated in the event that the core power exceeds the core power operating limit. This provides adequate margin to the linear heat rate operating limit for normal steady state opera-tion.
Normal reactor power transients or equipment failures which do not require a reactor trip may result in this core power operating limit being exceeded. In the event this occurs, COLSS alarms will be annunciated.
If the event which causes the COLSS limit to be exceeded results in conditions which approach the core safety limits, a reactor trip will be initiated by the Reactor Protective Instrumentation. The COLSS calculation of the linear heat rate includes appropriate penalty factors which provide, with a 95/95 probability /
confidence level, that the maximum linear heat rate calculated by COLSS is conservative with respect to the actual maximum linear heat rate existing in the core.
These penalty factors are determined from the uncertainties associated with planar radial peaking measurement, engineering design factors, axial densification, software algorithm modelling, computer processing, rod bow and core power measurement.
Parameters required to maintain the operating limit power leve) based on linear heat rate, margin to DNB and total core power are also monitored by the CPCs assuming minimum core power of 20% RATED THERMAL POWER.
The 20% Rated Thermal Power threshold is due to the neutron flux detector system being inaccurate below 20% core power.
Core noine level at low power is too large to obtain usable detector readings.
Therefore, in the event that the COLSS is not being used, operation within the limits of Figure 3.2-2 can be maintained by utilizing a predetermined local power density margin and a total core power limit in the CPC trip channels. The above listed uncertainty penalty factors
[
plus those associated with startup test acceptance criteria are also included in the CPCs.
I SAN ONOFRE-UNIT 3 B 3/4 2-1 AMENDMENT NO.
ENCLOSURE 2 UNITS 2 AND 3 TECHNICAL SPECIFICATIONS PCNs 325 AND 442 MARKUP
t 3/4.2 POWER DISTRIBUTION LIMITS 3/4.2.1 LINEAR HEAT RATE g
r LIMITING CONDITION FOR OPERATION 1
3.2.1 The linear heat rate shall not exceed M 13;0 kw/ft.
g APPLICABILITY: MODE 1 above 20% of RATED THERMAL POWER.
ACTIOtj:
With ine lircer Sect rate exceeding it: limitc, Oc indicated by cither (1) the COLEE calculated ccre perer excceding the COLEE calculated cere percr operating limit Esced en '" /f t; cr (E) the COLEE ic net being ured, any OPEPR LE Local rcrc: Dencity channci creceding the lincar heet rat limit, within 15 minutec initiate cerrcctiJe action te reduce the linc2r Sc2t rate te ithir the limitr and either; 2.
Hectere the linear heat rate te rithin it: limit: :ithin en: hour, Sw h.
Ec in at leset "OT STA"EY ::ithin th^ ner'- E heurc.
al With COLSS~in'. service;andithe' linear heat hate'nottbeing:: maintained as indicated'byl.COLSS; calculated core power!exceedingJthe:COLSS' calculated
~
core powerioperating limit' based on linear heat;ratel(kw/ft):
N m
n ik Re' store theilinearlheat rate to within(itsT11mits within?1; hour,for g
A 2.
ReduceETHERNAL1 POWER to,less;than.or equalitoi20%iofiRATED THERMAL z
POWER within.thelnextL6 hoursi
~
b, WithLCOLSS;notLin_serviceland the<linearLheatirateinotibeing, maintained asEindicated bylany..; OPERABLE LocalfPowerkDensity channelfexceedingithe linearfheatarate;1imiti 1;
Within.15EminutealinitiateTsurveillancelrequirement[4;2 1'.3 and restore thelline'arfheatirate'to withinilimits'within'4? hours,,or 21 ReduceTTHERMAL~POWERito less'than7or'equalitoT20%iof. RATED. THERMAL POWER within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
~
l SURVEILLANCE REQUIREMENTS 4.2.1.1 The provisions of Specification 4.0.4 are not applicable.
4.2.1.2 The linear heat rate shall be determined to be within its limits when THERMAL POWER is above 20% of RATED THERMAL POWER by continuously monitoring 4
the core power distribution wie :he Core Operating Limit Supervisory System
{
(COLSS) or, with the COLSS out service, by verifying at least once per
.i 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> that the linear heat rate, as indicated on all OPERABLE Local Power 1
i w
Density channels, is within the limit of M 13.0 kw/ft.
A 4'.2.1132 WithcCOLSS1not2in' service-and the linear' heat; rate notibeing maintainedTas~ indicated byLanyfOPERABLE' Local' Power" Density Channel! exceeding g
the linearsheaC ratellimitil. verify'every 15 minutesLthat:there is'no~ adverse g
trend' in.;the711near; heat'jate!
d L
k t*M' 4.2.1.44 At least once per 31 days, the COLSS Margin Alarm shall be verified to actuate at a THERMAL POWER level less than or equal to the core power k
operating limit based on kw/ft.
SAN ONOFRE-UNIT 2 3/4 2-1 AMENDMENT NO.
d 3 /4. 2 POWER DISTRIBUTION LIMITS 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 will not exceed 2200 F.
Either of the two core power distribution monitoring systems, the Core Operating Limit Supervisory System (COLSS) and the Local Power Density channels in the Core Protection Calculators (CPCs), provide adequate monitoring of the IO core power distribution and are capable of verifying that the linear heat rate f
does not exceed its 64e limits. The COLSS performs this function by G'
continuously monitoring the core power distribution and cf ulating a core power operating limit corresponding to the allowable peak line-Seat rate.
Reactor operation at or below this calculated power level assures that the limits of 44,9 13.0 kw/ft are not exceeded.
.2 1
M The COLSS calculated core power and the COLSS calculated core power operating limits based on linear heat rate are continuously monitored and displayed to the operator. A COLSS alarm is annunciated in the event that the core power exceeds the core power operating limit. This provides adequate margin to the linear heat rate operating limit for normal steady state opera-tion.
Normal reactor power transients or equipment failures which do not require a reactor trip may result in this core power operating limit being exceeded. In the event this occurs, COLSS alarms will be annunciated.
If the event which causes the COLSS limit to be exceeded results in conditions which approach the core safety limitr, a reactor trip will be initiated by the Reactor Protective Instrumentation. The COLSS calculation of the linear heat rate includes appropriate penalty factors which provide, with a 95/95 probability /
confidence level, that the maximum linear heat rate calculated by COLSS is conservative with respect to the actual maximum linear heat rate existing in the core. These penalty factors are determined from the uncertainties associated with planar radial peaking measurement, engineering design factors, axial densification, software algorithm modelling, computer processing, rod bow and core power measurement.
The! core power; distribution'and;Talcorresponding_powe17 operating;1imit; based on Linear <ReatL RateL(LHR)L are' more accurately determined!by Tthe.COLSS using the l
incore: detector system. : The CPCs determine?LHR[less accuratelyf with ;the"excore y
detectors; When COLSS:is?notTavailable;the;,TSlLCOs~are~morelrestrictiveLdue to y
theEuncertalnty ofithewCPCs. LHoweverl when COLSSfbecomes inoperable'the*added t
margin associated lwith CPCfuncertainty is not1immediately; required;and.aT4 hour 2
ACTION'is'providedLforfappropriatelcorrective action.
d[
Parameters required to maintain the operating limit power level based on linear heat rate, margin to DNB and total core power are also monitored by the CPCs assuming minimum core power of 20% RATED THERMAL POWER.
The 20% Rated Thermal Power threshold is due to the neutron flux detector system being inaccurate below 20% core power. Core noise level at low power is too large to obtain usable detector readings. Therefore, in the event that the COLSS is not being used, operation within the limits of Figure 3.2-2 can be maintained by utilizing a predetermined local power density margin and a total core power limit in the CPC trip channels. The above listed uncertainty penalty factors plus those associated with startup test acceptance criteria are also included in the CPCs.
SAN ONOFRE-UNIT 2 B 3/4 2-1 AMENDMENT NO.
3/4.2 POWER DISTRIBUTION LIMITS 3/4.2.1 LINEAR HEAT RATE A
LIMITING CONDITION FOR OPERATION h
t 3.2.1 The linear heat rate shall not exceed 4A4 13'.0 kw/f t.
APPLICABILITY: MODE 1 above 20% of RATED THERMAL POWER.
ACTION:
Mith th^ lireer 'est rate exceeding itc limitc, 2 indicated by cither (1) the COLEE calculated cere percr exceeding the COLEC c21cu22ted ccre percr cper2 ting limit baced en '" /ft; cr (2) " hen the COLEC ic not being uccd, 2ny CPEPM LE Lec21 Perer Dencity ch2nnel encccding the linc2r hect r2tc limit, :ithir 15 mi 2tcc initi2tc correctifc cation te reduce the lincar hc2t r2tc to crithin the Mmit: 2nd 2i4}WF+
2.
" cater tPc linear h 2t r2tr te ::ithir it: limit: ::ithir en^ hour, or b.
Ec in 2t le2ct MOT ST m ?Y ithir the ncn* E heurc a.
With~COLSS'it servicefand the linear heat rate.not,being maintained,as indicated by~COLSS calculated core' power exceeding:.the.COLSS' calculated core power ' operating ~ limit L based on linear heat rateT (kw/f t) :
M 1;
Restore the~ linear heat.' rate' towithin its' limits within.1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />,.or j
t 2.
Reduce THERMAL POWER to lesslthanior. equal to 20%;of RATED THERMAL POWER withinlthe~nextE6 hours.
b.
With COLSS;not"in service 1and'the linear' heat. rate.not being maintained as indicated;by any OPERABLE. Local' Power Density.. channel ~ exceeding lthe linear heat rate limit 1;
Within 15 minutes initiate, surveillance requirement.4.2.113"and restore. thel linear heat' rate ' to' within. limits :.within '4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, or 2.
Reduce THERMAL POWERito less than or equal'toL20t'of RATED THERMAL POWER within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
SURVEILLANCE REQUIREMENTS 4.2.1.1 The provisions of Specification 4.0.4 are not applicible.
4.2.1.2 The linear heat rate shall be determined to be within its limits when THERMAL POWER is above 20% of RATED THERMAL POWER by continuously monitoring the core power distribution with the Core Operating Limit Supervisory System (COLSS) h or, with the COLSS out of service, by verifying at least once per 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> that 7
the linear heat rate, as indicated on all OPERABLE Local Power Density channels, g
is within the limit of 4 A 4 13.0 kw/ft.
g 4 '. 2; 1. 31 : Withi.COLSS'not in'. service'andithellinear heat,rateLnot being maintained
~
as% indicated'by any.. OPERABLE ~ Local Power. Density, channel. exceeding'the. linear D
heatTrate. limit, verify every 15 minutes that there is no? adverse trend in the i
linear: heat: rate,
~1 2.
4.2.1.84 At least once per 31 days, the COLSS Margin Alarm shall be verified to 7
act'1 ate at a THERMAL POWER level less than or equal to the core power operating 2
limit based on kw/ft.
(
SAN ONOFRE-UNIT 3 B 3/4 2-1 AMENDMENT NO.
3/4.2 POWER DISTRIBUTION LIMITS 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 will not exceed 2200 F Either of the two core power distribution monitoring systems, the Core (3
Operating Limit Supervisory System (COLSS) and the Local Power Density channels y
in the Core-Protection Calculators- (CPCs), provide adequate monitoring of the h
core power distribution and are capable of verifying that the linear heat rate does not exceed its &be limits. The COLSS performs this function by continuously monitoring the core power distribution and calculating a core power operating limit corresponding to the allowable peak linear heat rate.
Reactor a
operation at or below this calculated power level assures that the limits of
{
&%4 13.0 kw/ft are not exceeded.
u The COLSS calculated core power and the COLSS calculated core power operating limits based on linear heat rate are continuously monitored and-displayed to the operator. A COLSS alarm is minunciated in the event that the core power exceeds the core power operating linit. This provides adequate margin to the linear heat rate operating limit for normal steady state opera-tion.
Normal reactor power transients or equipment failures which do not require a reactor trip may result in this core power operating limit being exceeded.
In the event this occurs, COLSS alarms will be annunciated.
If the event-which causes the COLSS limit to be exceeded results in conditions which approach the core safety limits, a reactor trip will be initiated by the Reactor Protective Instrumentation. The COLSS calculation of the linear heat rate includes appropriate penalty factors which provide, with a 95/95 probability /
confidence level, that the maximum linear heat rate calculated by COLSS is conservative with respect to the actual maximum linear heat rate existing in the These penalty factors are determined from the uncertainties associated core.
with planar radial peaking measurement, engineering design factors, axial densification, software algorithm modelling, computer processing, rod bow and core power measurement.
The core' power distribution ~'and a. corresponding power operating-licit. based on Linear Heat Rate '{LHR)7arelmorefaccuratelyfdetermined by theiCOLSS using'~the incore detector system.- EThe'CPCs. determine LHR lessiaccuratelymwithithehxcore g
detectors. LWhen~COLSS is notLavailableLtheLTS:LCOs;are;more;restrictiveIdueLto e
~
thelbncertaintys of'the CPCs HoweveriTwhen COLSS'becomes; inoperable'theladded margin; associated'with CPC:uncertaintyJis notTimmediatelyfrequiredandla 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> ACTION. is provided ' forlappropriatelcorrective f action.
Parameters required to maintain the operating limit power level based on linear heat rate, margin to DNB and total core power are Llso monitored by the CPCs assuming minimum core power of 20% RATED THERMAL POWER.
The 20% Rated Thermal Power threshold is due to the neutron flux detector system being inaccurate below 20% core power.
Core noise level at low power is too large to obtain usable detector readings. Therefore, in the event that the COLSS is not being used, operation within the limits of Figure 3.2-2 can be maintained by utilizing a predetermined local power density margin and a total core power limit in the CPC trip channels. The above listed uncertainty penalty factors plus those associated with startup test acceptance criteria are also included in the CPCs.
SAN ONOFRE-UNIT 3 B 3/4 2-1 AMENDMENT NO.