ML19207C227

Application to Amend Tech Specs to Change Limiting Conditions of Core Thermal Power & Helium Flow Rate & Amount of Fuel Oil Required to Maintain Power Operated Relief Valve Cooling in Loss of Forced Circulation Situations

ML19207C227
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/29/1979
From:	Millen C PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML19207C223	List: ML19207C222 ML19207C227
References
NUDOCS 7909100508
Download: ML19207C227 (14)

Text

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i BllfEP2 Tif E lluITED STATES NUCL::AR PIGL"uATORY C072fISSIO:i In the !!atter of the Facility Oncrating License)

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of ) Do cket :;o. 50-267

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PUliLIC SERVICE C01:PA'iY OF COLORADO )

Application for Anendmnt to Appendix A of Facility Operating License Licenae No. DP R-34 / .A.A,,

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OF THE PUdLIC SERVICE COMPA'iY OF COLORADO FOR TiiE "0RT ST. VRAIN iiUCLl:AR C10?ERATI?iG SYATIO!T This application for Anendaent to Appendix A of Facility Op eratin;; Licens e, Licenne :10 DP R- 34, is aubnitted for :iRC reviev and approval.

Frapectfully submitted, PLILIC S ERVICE CO?DTTY OF COLOFX00

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C. K. ac , Senior Vice President

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SFIELD & 0' DO:!'iELL

.& Donnel obert .. 9iorpson Public Servic , Conoony Building Denve r, Coloraco 02U2 Attorneys f o r Anplican t o.,,,q'* ;c) 7000100 M .

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STATE OF COLOPADO )

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CITY AfD ColIITY OF D;NVER)

C. K.11111en, being first duly sworn, deposes and says;

'niat he is Senior Vice President of Operations of Public Service Company of Colorado, the Licensee herein; that he has read the foregoing Application for Amend: cut to Appendix A of Facility Operating License and knows the contents thereof, and that the staterents and natters set forth therein are true and correct to the beat of his knavledge, information and b elief.

.f*' ,f l //

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C. K. Stillen Subacribed and nuorn to before te this <I # ~ day of Auguat, 1979.

Witness ry hand and of ficial seal.

Ity coardsaion expires: - ,,

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otary Public iNY

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ATTACHMENT 1 a

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3.1 Reactor Core - Safety Limit 3.1.1 Applicability Applies to the limiting combinations of core thermal power and core helium flow rate.

3.1.2 Objective To maintain the integrity of the fuel particle coatings.

3.1.3 Specification SL 3.1 - Reactor Core Safety Lindt The combination of the reactor core power-to-flow ratio and the total integrated operating time at the power-to-flow ratio during the lifetime of any segment shall not exceed the following limits.

3.1.3.1 Power-to-Flow Ratio Setween 1.17 and 2.5 The combination of the reactor core power-to-flow ratio and the total integrated operating time at thia power-to-flow ratio during the lifetime of any segment shall not exceed the limit given in Figure 3.1-1. This safety limit is exceeded when the combination of operating parameters (power, flow, and time) lies above or to the right of the line given in Figure 3.1-1.

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For the purpose of obtaining the total effective integrated operating time for Figure 3.-1, only transients resulting in a power-to-flow ratio above the curve of Figure 3.1-2, at the appropriate core power level shall be used.

3.1.3.2 Power-to-Flow Ratio Greater than 2.5 and Less Than or Equal to 15 The time interval (t) from the start of the transient in power-to-flow ratio above Figure 3.1-2 to the time at which the power-to-flow ratio goes below a value of 2.5 shall be reduced by 100 seconds and the remaining time shall be limited to a total allowable time of 2 minutes. The allowable time for power-to-flow ratios less than 2.5 at times larger than (t) are given in 3.1.3.1.

3.1.3.3 Power-to-Flow Ratio Greater than 15 The time interval (t) from the start of the transient in power-to-flow ratio above Figure 3.1-2 to the time at which the power-to-flow ratio goes below a value of 2.5 shall be reduced by 60 seconds and the remaining time shall be limited to a total allowable time of 2 minutes. The allowable time for power-to-flow ratios less than 2.5 at times larger than (t) are given in 3.1.3.1.

3.1.3.4 Power-to-Flow Ratio Less Than 1.17 For power-to-flow ratios exceeding values of Figure 3.1-2 but less than 1.17, an operating time limit of 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> shall be used. If the conbination of power-to-flow ratio and percentage of design core thermal power 3.30I."/3

exceeds the curve of Figure 3.1-2, the operator will take action to bring the combination of power-to-flow and percentage of design core thermal power under the curve of Figure 3.1-2. If this cannot be accomplished in four hours, an orderly shutdown shall be initiated.

3.1.4 Basis for Specification SL 3.1 In order to assure integrity of the fuel particles as a fission pro-duct barrier, it is necessary to prevent the f ailure of significant quantities of fuel particle coatings. Failure of fuel particle coatings can result from the migration of the fuel kernels through their coatings. The dependence of the rate of migration of the particle kernel upon temperature and temperature difference across the particle kernel using 95% confidence levels on the ex-perimental data was used. During power operation, there is a temperature gradient across each fuel rod, the higher temperature being at the center of the fuel rod and the lower temperature at the outer edge of the fuel. In an overtemperature condition, fuel kernels can move through their coatings in this temperature gradient, in the direction of the higher temperature.

The Core Safety Limit has been constructed to assure that a fuel ker-nel migrating at the highest rate in the core will penetrate a distance less than the combined thickness of the buf fer coating plus the inner isotropic coating on the particle.

The quantity of failed particle coatings in the core at all times is determinable by measurement of gaseous fission product activity in the pri-mary loop.

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In Figure 3.1-1, the quantity P is the fraction of design core ther-mal power, i.e., core thermal power (W) divided by 842. The quantity F is the f raction of design core coolant flows at the circulators, i.e. , the total coolant flow at the circulators in (lb/hr) divided by 3.5 x 106 lb/hr.

The limiting combinations of core thermal power and core coolant flow rate are established using a series of short time conservative assumptions.

All hot channel factors discussed in Section 3.6 and all power peaking fac-tors discussed in Section 3.5.4 of the FSAR were applied in determining this limiting curve. The range of region radial power peaking f actors (average power density in any refueling region, P eg, divid d by average power density in the core, P e

) was assumed to be less than or equal to 1.83 and greater th an. or equal to 0.4. The maximum intra-region power peaking factor (average power density in a fuel column, P , divided by the average power density in a fuel region, P.- ) used was 1.46 1 0.2 for regions with control rods inserted and 1.34 1 0.2 for all unrodded regions. A conservative estimate of the most unfavorable axial power distribution was also used. That is, the ratio of power density in the bottom layer of fuel elements of a core region, P

er @ r, to the average power density of the region, P , is less than or equal to 0.90 1 0.09 for regions with control rods fully inserted or with-drawn, and 1.23 1 0.12 for regions with control rods inserted more than two fee t. The measured region coolant outlet temperature for the nine regions with their orifice valves most fully closed and all regions with control rods inserted more than two feet, was assumed to be not more than 50 F greater than the core average outlet temperature. The measured region coolant out-let temperature for the remaining core regions was assumed to be not more than 330173

200*F greater than the core average outlet temperature. During normal full power operation, a condition with any measured region outlet temperature more than 50 F above average should not persist for longer than a few hours. A measurement uncertainty for the core region outlet temperature o f + 50* F was ass ume d. A 5% uncertainty in flow measurement and a 5% uncertainty in reactor thermal power measurement was assumed in establishing the limit.

For the total fuel lifetime in the core, based on calculations incor-porating plant parameters and uncertainties appropriate for longer times, mi-gration of the fuel particle kerne? through its coating would be less than 20 microns for the fuel with the most damaging temperature history and with the core operated constantly at any of the power-to-flow ratios and power com-binations shown on the curve of Figure 3.1-2. Out of a total inner coating thickness of 70 microns, only 50 microns have been used for the determination o f fuel particle failure in setting the 1.mit curve in Figure 3.1-1.

As can been seen from Figure 3.1-1, suf ficient time (at least nine minuces) is available for the operator to take corrective action to prevent the core safety limit from being exceeded for nower-to-flow ratios less than or equal to 2.0. In order to reach a power-to-flow ratio of this magnitude through an increase in core power, significant equipment malfunction, or failure, and/or one or more significant deviations from operating procedures would have to occur.

However, high core power-to-flow ratios can also be obtained as a result of a reduction or loss of primary coolant circulation. The core nega-tive coef ficient of reactivity provides an intrinsic means to reduce the core z; ., o r -[-ol3 kje)lI46

power and the power-to-flow ratio, and the plant control system will usually initiate scram sequences in such cases. Nevertheless, for brief periods of time prior to or during the scram, high power-to-flow ratios can exist. Due to the slow thermal response of the core as a result of its high heat capacity, these power-to-flow rat'.os can exist for short periods of time without signifi-cantly increasing fuel tecperatures and fuel kernel migration distances.

The behavior of the core during numerous transients has been dis-cussed in the FSAR. The slow thermal response of the core is evident from the analysis results shown in Chapter 14 and Appendix D. For example, the Loss of Forced Circulation (LOFC) accident analysis presented in FSAR Appendix D shows that the maximum core temperature rises at a rate of only 6*F/ minute for the first two hours following transient initiation. During that time, however, the primary flow rate is zero, while due to fission -~oduct decav heat the effective core power is as high as 3%. Thus , the power-cu -flow ratio is f ar above the highest value shown in Figure 3.1-1.

Under transient conditions , either abnormal rapid power increases or sudden flow decreases, the allowable time in Figure 3.1-1 and 3.1-2, which was derived f rom steady state calculations, is not a meaningful indicator of kernel migration and fuel integrity. Accordingl, , a delay period is appropriate for transients entailing either a sudden decrease in primary coolant flow with a consequent decrease in reactor power or an abnormal rapid power increase.

This delay period represents the time required for the fuel to heat up from normal operating temperatures to the steady state temperatures at higher power-to-flow ratios represented by the Core Safety Limit Cu rve. Therefore, (3 s>

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this delay period can be allowed without compromising the integrity of the fuel. As a result of many transient analyses, the delay period has been con-servatively set at 100 seconds for transients resulting in a power-to-flow ratio above 2.5 but less than or equal to 15 and 60 seconds if the power-to-flow ratio is greater than 15.

The allowable time, af ter the delay time, for all transients which lead to a power-to-flow ratio in excess of 2.5 is set at 2 minutes which is also the allowable time for a power-to-flow ratio of 2.5 given by Figure 3.1-1.

The limitation of allowable operating time to a value of 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> for all operations with a power-to-flow ratio above the curve of Figure 3.1-2 and below a value of 1.17 provides a conservative limit since this is the allowable time for a power-to-flow ratio of 1.17 given by Figure 3.1-1.

Limiting the continuous operating time in this range of power-to-flow ratios to a value of 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> is additionally conservative. The 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> continuous operating time limit must be included as a fraction of the 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> allowable time.

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ATTAG MENT 2 33013.1

- me Basis for Specification LCO 4.2.17 The ACM diesel generator provides power independently of the plant elec-trical distribution network to various valves, lighting, and pieces of equip-ment. That equipment provides an alternate means of maintaining PCRV cooling during the Loss of Forced Circulation situation described in the Final Safety Analysis Report, Section 14.10.

The 10,000 gallons of fuel provides for 108 hours0.00125 days <br />0.03 hours <br />1.785714e-4 weeks <br />4.1094e-5 months <br /> operation of the gen-erator with full ACM load, which is adequate time for obtaining additional fuel from off site sources.

Reason for Change The information used to initially establish the time that 10,000 gallons of fuel oil would provide for full ACM load used a fuel consumption rate which was more conservative than that determined by actual test. A fuel oil consump-tion test was performed which established that 10,000 gallons of fuel oil will provide for 41/2 days (108 hours0.00125 days <br />0.03 hours <br />1.785714e-4 weeks <br />4.1094e-5 months <br />) operation with full ACM load of 900 KW.

3.301bd