ML17311A796

Rev 0 to Core Operating Limits Rept for Pvngs,Unit 2,Cycle 6.

ML17311A796
Person / Time
Site:	Palo Verde
Issue date:	04/10/1995
From:	ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:
Shared Package
ML17311A795	List: ML17311A794 ML17311A796
References
NUDOCS 9504140162
Download: ML17311A796 (40)

Text

PALO VERDE NUCLEAR GENERATING STATION (PVNGS)

UNIT 2 CYCLE 6 Revision 0 9504i40162 9504i0 PDR ADOt:K 05000529 P PDR

Revision 0 CORE OPERATING LIMITS REPORT PALO VERDE NUCLEAR GENERATING STATION (PVNGS)

UNIT 2 CYCLE 6 INDEX

~AvF.

REVISION HISTORY .

AFFECTED PVNGS TECHNICAL SPECIFICATIONS CORE OPERATING LIMITS LIST OF FIGURES LIST OF TABLES 18 Page 2 of 23

Revision 0.

CORE OPERATING LIMITSREPORT PALO VERDE NUCLEAR GENERATING STATION (PVNGS)

UNIT 2 CYCLE 6 REVISION HISTORY Revision Date ~Pa es Issue for Use (23 Total Pages)

Page 3 of 23

P Revision 0 CORE OPERATING LIMITSREPORT PALO VERDE NUCLEAR GENERATING STATION (PVNGS)

UNIT 2 CYCLE 6 This Core Operating Limits Report for PVNGS Unit 2 Cycle 6 has been prepared in accordance with the requirements of Technical Specification 6.9.1. The core operating limits have been developed using the NRC approved methodologies specified in Section 6.9.1.10 of the Palo Verde Unit 2 Technical Specifications.

I'I'H THD PVN TH HNI AI. PH IFI ATI N

1) 3.1.1.2 Shutdown Margin KN ~ - Any CEA Withdrawn

2) 3.1.1.3 Moderator Temperature Coefficient

3) 3.1.2.7 Boron Dilution Alarms

4) 3.1.3.1')

Movable Control Assemblies - CEA Position 3.1.3.6 Regulating CEA Insertion Limits

6) 3.1.3.7 Part Length CEA Insertion Limits

7) 3.2.1 Linear Heat Rate

8) 3.2.3 Azimuthal Power Tilt - Tq

9) 3.2.4 DNBR Margin

10) 3.2.7 Axial Shape Index RH PHRATIN I IMIT The cycle-specific operating limits for the specifications listed are presented below.

8.1.1.2 - Shutdown Mar 'n K~ - An CEA Withdrawn The Shutdown Margin shall be greater than or equal to that shown in Figure l.

3.1.1.3 - Moderator Tem erature Coefficient The moderator temperature coefficient (MTC) shall be within the area of Acceptable Operation shown on Figure 2.

Page 4 of 23

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Revision 0 PVNGS UNIT 2 CYCI E 6 CORE OPERATING L'IMITS REPORT RE PERATIN I IMIT - NTIN ED 3.1.2.7 - Boron Dilution Alarms With one or both start-up channel high neutron flux alarms inoperable, the RCS boron concentration shall be determined at the applicable monitoring frequency specified in Tables 1 through 5.

3.1.3.1 - Movable Control Assemblies - CEA Position With one or more full-length or part-length CEAs misaligned from any other CEAs in its group by more than 6.6 inches, the minimum required MODES 1 and 2 core power reduction is specified in Figure 3.

3.1.3.6 - Re latin CEA Insertion Limits One or more CEAC's OPERABLE: The regulation CEA groups shall be limited to the withdrawal sequence and to the insertion limits shown ori Figure 4 when the COLSS is IN SERVICE or shown on Figure 5 when the COLSS is OUT OF SERVICE.

.1..7- Part Len h EA Insertion Limits One or more CEAC's OPERABLE: The part length CEA groups shall be limited to the insertion limits shown on Figure 6.

3.2.1 - Linear Heat Rate The linear heat rate limit of 13.5 kw/ft shall be maintained.

.2.3 - Azimuthal Power Tilt - T The AZIMUTHALPOWER TILT (Tq) shall be less than or equal to the limit in Figure 7 with COLSS IN SERVICE.

Page 5 of 23

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Revision 0 PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITSREPORT RF<. PF<.RATIN I.IMIT - TI ED 3.2.4- DNBR Mar 'n COLSS IN SERVICE and Both CEAC's INOPERABLE - Maintaining COLSS calculated core power less than or equal to COLSS calculated core power operation limit based on DNBR decreased by the allowance shown in Figure 8.

COLSS OUT OF SERVICE and Either One or Both CEAC's are OPERABLE - Operating within the region of acceptable operation of Figure 9 using any operable CPC channel.

COLSS OUT OF SERVICE and CEAC's INOPERABLE - Operating within the region of acceptable operation of Figure 10 using any operable CPC channel.

3.2.7- Axial Sha e Index The core average AXIALSHAPE INDEX (ASI) shall be maintained within the following limits:

COLSS OPERABLE

-0.28 < ASI < 0.27 COLSS OUT OF SERVICE (CPC)

-0.20 < ASI < 0.20 Page 6 of 23

N Revision 0 PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITSREPORT

,I T F<FI v RES

1. Shutdown Margin Versus Cold Leg Temperature.

2. MTC Acceptable Operation, Modes 1 and 2.

3. Core Power LimitAfter CEA Deviation.

4. CEA Insertion Limits Versus Thermal Power (COLSS In Service).

5. CEA Insertion Limits Versus Thermal Power (COLSS Out of Service)

6. Part Length CEA Insertion LimitVersus Thermal Power.

7. Azimuthal Power Tilt LimitVersus Thermal Power (COLSS In Service).

COLSS DNBR Power Operating LimitAllowance for Both CEACs Inoperable.

9. DNBR Margin Operating Limit Based on Core Protection Calculators (COLSS Out of Service, CEACs Operable) 10.DNBR Margin Operating LimitBased on Core Protection Calculators (COLSS Out of Service, CEACs Inoperable)

Page 7 of 23

t PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITSREPORT Revision 0 FIGURE 1 SHUTDOWN MARGIN VERSUS COLD LEG TEMPERATURE (500, 6.5 RE ION OF ACCEPTABLE OPERATION A (350 4.0)

@o 4 S4 REGION OF UNACCEPTABLE OPERATION 100 200 300 400 500 600 COLD LEG TEMPERATURE ( F)

Page 8 of 23

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0.5 ech. Spec. 3.1.1.3 aximum Upper imit (100%, 0.0)

(0%, 0.3$

0 (20%, 0.1) Q (50%, 0.0)

(100%, -0.2)

-0.5 Beginning of Cycle limit g

MTC AREA OF ACCEPTABLE OPERATION 0

-2.5 0

g (0%, -3.1) End of Cycle limit 0

-3.5 (100%, -3.8)

-4.0 I I I I 0 10 20 30 40 50 60 70 80 90 100 CORE POWER LEVEL,% OF RATED THERMALPOWER

Revision 0 PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITSREPORT FIGURE 3 CORE POWER LIMITAFTER CEA DEVIATION":

30 R

0 (60 MIN, 20%)

U A 20 Q c4 Oa C4 Q io gg Pc4 0 10 20 30 40 50 60 TIME AFTER DEVIATION,MINUTES

• WHEN CORE POWER IS REDUCED TO 55% OF RATED THERMAL POWER PER THIS LIMITCURVE, FURTHER REDUCTION IS NOT REQUIRED Page 10 of 23

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1.0 0.9 0.8 0.7 o

0 + Qi z 0.6 ecn~(R t-~Fr 0 0 RAN IENT NSE TIO LIM 0t z

/0 0.5 g~@~)O o< @5 M y oo, p Ch5 0.4 92 Cn \

0.3 H 0 0.2 0.1 0

0.0 GROUPS GROUP 3 GROUP 1 150 120 90 60 30 0 150 120 90 60 30 0 150 120 90 60 30 0 GROUP4 GROUP 2 150 120 90 60 30 0 150 120 90 60 30 0 CEA POSITION INCHES WITHDRAWN)

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1.0 0.9 0.8 0

z 0.7 0

0.6 0.5 p04 M +~ ~

0 +~>~O 0.4 z ~+ms@

0.3 ~ ~~ 4 R~>>o.

M 0.2 0.1-0.0 GROUP5 GROUP3 GROUP 1 150 120 90 60 30 0 150 120 90 60 30 0 150 120 90 60 30 0 GROUP 4 GROUP 2 150 120 90 60 30 0 150 120 90 60 30 0 CEA POSITION (INCHES WITHDRAWN)

l 1.00 R

Q 0.90 0+

zQ R 0.80 O

0>

Q C5 0.70 2'.

0 M z z 0 0.60 th C5 (50% RATED THERMALPOWER) 0 0 z z 0.50 0"0 z 5 0 0

.0.40 0 z R

0 R 0.30 R Q q

0 iB

+n C) zO 0.20 zO 0 3 z

I" 0.10 0 0 0.00 C

~ 0 o~

fA O 0 0 0 0 0 0 OO Ch 0 o 'o tA o o 0 PART LENGTH CEA POSITION, INCHES WITHDRAWN

H 1'

r PI t

4 t

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t PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITS REPORT Revision 0 FIGURE 7 AZIMUTHALPOWER TILT LIMITVERSUS THERMALPOWER (COLSS IN SERVICE) 100 90 80 R

l4 70 0C4 UNACCEPTABLE c 60 OPERATION ~

C4 50 g

0 40 30 20 15 10 A

OPERATION 20 30 40 50 60 70 80 90 100 PERCENT OF RATED THERMALPOWER Page 14 of 23

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Revision 0 PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITS REPORT FIGURE 8 COLSS DNBR POWER OPERATING LIMIT ALLOWANCEFOR BOTH CEACs INOPERABLE 100 (20, 95)

C4 75 o 50 Q

C4 0

25 U

C4 fV 0

25 20 15 10 COLSS DNBR POWER OPERATING LIMITREDUCTION

(% OF RATED THERMALPOWER)

Page 15 of 23

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Revision 0 PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITS REPORT FIGURE 9 DNBR MARGIN'OPERATING LIMITBASED ON CORE PROTECTION CALCULATORS (COLSS OUT OF SERVICE, CEACs OPERABLE) 2.5 ACCEP ABLE 2.4 OPERATION M NIMUM1 C AC OPERA LE 2.3 zA (0.06,2.22)

(0.2, 2.22) 2 U 2.1 U

(-0.2, 2.07 2.0 UNACCE TABLE OPERATION

'.9 1.8

-0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 CORE AVERAGE ASI Pago 16 of 23

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t PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITSREPORT t Revision 0 FIGURE 10 DNBR MARGIN OPERATING LIMITBASED ON CORE PROTECTION CALCULATORS (COLSS OUT OF SERVICE, CEACs INOPERABLE) 2.6 ACCE ABLE OPERATION 2.5 CEACs INO ERABLE (0.2, 2.45)

(0.05 2.45) 2.4 2.3 i5

(-0.2, 2.25) 2.2 UNAC PTABLE 2.1 OPERATION 2.0

-0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 CORE AVERAGE ASI Page 17 of 23

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Revision 0 PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITSREPORT I,I T I TABLFS

l. Required Monitoring Frequencies for Backup Boron Dilution Detection as a Function of Operating Charging Pumps and Plant Operational Modes for E g > 0.98.

2. Required Monitoring Frequencies for Backup Boron Dilution Detection as a Function of Operating Charging Pumps and Plant Operational Modes for 0.98 > E g > 0.97.

3. Required Monitoring Frequencies for Backup Boron Dilution Detection as a Function of Operating Charging Pumps and Plant Operational Modes for 0.97 > E,g > 0.96.

4. Required Monitoring Frequencies for Backup Boron Dilution Detection as a, Function of Operating Charging Pumps and Plant Operational Modes for 0.96>K g> 0.95.

5. Required Monitoring Frequencies for Backup Boron Dilution Detection as a Function of Operating Charging Pumps and Plant Operational Modes for E F 50.95.

Page 18 of 23

4I Revision 0 PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITSREPORT TABLE 1 REQUIRED MONITORING FREQUENCIES FOR BACKUP BORON DILUTIONDETECTION AS A FUNCTION OF OPERATING CHARGING PUMPS AND PLANT OPERATIONAL MODES FOR Kcff) 0.98 Number of Operating Charging Pumps '

OPERATIONAL MODE 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> ONA ONA not on SCS 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> ONA ONA 5 not on SCS 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> ONA ONA 48'on SCS ONA ONA ONA ONA Notes: SCS = Shutdown Cooling System-ONA = Operation Not Allowed Page 19 of 23

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Revision 0 PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITS REPORT TABLE 2 REQUIRED MONITORING FREQUENCIES FOR BACKUP BORON DILUTIONDETECTION AS A FUNCTION OF OPERATING CHARGING PUMPS AND PLANT OPERATIONAL MODES FOR 0.98 > K ff) 0.97 1

Number of Operating Charging Pumps OPERATIONAL MODE 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> ONA 4 not on SCS 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 2.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 5 not on SCS 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 2.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 4&5onSCS 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> ONA ONA Notes: SCS = Shutdown Cooling System ONA = Operation Not Allowed Page 20 of 23

t PVNGS UNIT 2 CYCLE 6 CORE<

t OPERATING LIMITSRE<PORT Revision 0 TABLE 3 REQUIRED MONITORING FREQUENCIES FOR BACKUP BORON DILUTIONDETECTION AS A FUNCTION OF OPERATING CHARGING PUMPS AND PLANT OPERATIONAL MODES FOR 0.97 > K ff> 0.96 Number of Operating Charging Pumps OPERATIONAL MODE 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 3.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 4 not on SCS 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 3.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 5 not on SCS 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 3.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />

'&5onSCS 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> ONA Notes: SCS = Shutdown Cooling System ONA = Operation Not Allowed Page 21 of 23

Revision 0 PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITSREPORT TABLE 4 REQUIRED MONITORING FREQUENCIES FOR BACKUP BORON DILUTIONDETECTION AS A FUNCTION OF OPERATING CHARGING PUMPS AND PLANT OPERATIONAL MODES FOR 0.96 > K ff> 0.95 Number of Operating Charging Pumps OPERATIONAL MODE 0 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 4 not on SCS 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 5 not on SCS 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 48' on SCS 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> ONA Notes: SCS = Shutdown Cooling System ONA = Operation Not Allowed Page 22 of 23

I PVNGS UNIT 2 CYCLE 6 CORE OPERATING LIMITS REPORT l Revision 0 TABLE 5 REQUIRED MONITORING FREQUENCIES FOR BACKUP BORON DILUTIONDETECTION AS A FUNCTION OF OPERATING CHARGING PUMPS AND PLANT OPERATIONAL MODES FOR K~ff< 0.95 Number of Operating Charging Pumps OPERATIONAL MODE 1 2 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> 2.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 4 not on SCS 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 5 not on SCS 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> 1.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 4 k,5 on SCS 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 6 ( > 4000 ppm) 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 6 (( 4000 ppm) 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> ONA Notes: SCS = Shutdown Cooling System ONA = Operation not allowed Page 23 of 23

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