RS-08-094, Response to Request for Additional Information Related to Technical Specification 3.8.3, Diesel Fuel Oil and Starting Air

Response to Request for Additional Information Related to Technical Specification 3.8.3, Diesel Fuel Oil and Starting Air

ML082060176
Person / Time
Site:	LaSalle
Issue date:	07/23/2008
From:	Simpson P Exelon Generation Co, Exelon Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RS-08-094, TAC MD8674, TAC MD8675
Download: ML082060176 (17)

Text

Exelon Nuclear www,exeloncorp.corn 4300 Winfield Road Warrenville, IL 60555 RS-08-094 July 23, 2008 Attn : Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001 LaSalle County Station, Units 1 and 2 Facility Operating License Nos. NPF-11 and NPF-18 NRC Docket Nos. 50-373 and 50-374

Subject:

Response to Request for Additional Information Related to Technical Specification 3.8.3, "Diesel Fuel Oil and Starting Air" (TAC Nos. MD8674 and MD8675)

There are no regulatory commitments contained within this letter. Should you have any questions concerning this letter, or require additional information, please contact Mitchel Mathews at (630) 657-2819.

Exelon Nuclear 10 CFR 50.90

Reference:

Letter from P. R. Simpson (Exelon Generation Company, LLC) to U. S. NRC, "Request for a License Amendment to Technical Specification 3.8.3, 'Diesel Fuel Oil and Starting Air' to Relocate Stored Fuel Oil Volumes to Licensee Control,"

dated May 2, 2008 In the referenced letter, Exelon Generation Company, LLC (EGC) requested an amendment to Appendix A, Technical Specifications (TS), of Facility Operating License Nos. NPF-11 and NPF-18 for LaSalle County Station (LSCS), Units 1 and 2. The proposed change modifies TS Section 3.8.3, "Diesel Fuel Oil and Starting Air," to replace the numerical volume requirements for stored diesel fuel oil inventory with requirements that state that volumes equivalent to seven-days and six-days of fuel oil are available. EGC requested to move the diesel fuel oil numerical volumes equivalent to seven-day and six-day supplies to the TS Bases.

During the NBC's acceptance review of the Reference document, the NRC found that additional information was required to support its review. The requested information is provided in the attachment to this letter.

The information provided in this letter does not affect the No Significant Hazards Consideration, or the Environmental Consideration provided in Attachment 1 of the original license amendment request as described in the referenced submittal.

In accordance with 10 CFR 50.91(b), "State consultation," EGC is providing the State of Illinois with a copy of this letter and its attachment to the designated State Official.

July 23, 2008 U. S. Nuclear Regulatory Commission Page 2 I declare under penalty of perjury that the foregoing is true and correct. Executed on the 23rd day of July, 2008.

Respectfully, Patrick R. Simpson Manager - Licensing Exelon Generation Company, LLC

Attachment:

Response to NRC Request for Additional Information

Question #1 Below Table 1 (Page 3) it is stated that "The proposed numerical volumes requirements are based on calculating the maximum required fuel consumption (Ibm) over the American Petroleum Institute (API) gravity range allowed by SR 3.8.3.2 converted to a single volumetric value (gallons) at an API gravity of 30 at a nominal temperature of 60 °F. " Some commercially available ULSD is in the API gravity band of 27 to 39. Provide the bases for using an API gravity of 30, and provide justification as to why it is a conservative value.

Response

Exelon Generation Company's, LLC (EGC's) calculation considered all ultra-low sulfur diesel fuel oil (ULSD) across the allowable API gravity band of 27 to 39. This evaluation determined that the maximum mass of fuel would be required when considering the properties of ULSD at an API gravity of 27 at 50 °F. Since measured fuel oil storage tank level is converted to gallons, and fuel is ordered by the gallon, the maximum required mass of fuel was converted to gallons using an API gravity of 30 at 60 °F. Figures 1 through 4 below demonstrate that for the Division 1, 2, and 3 Diesel Generators at LaSalle County Station (LSCS), there is a significant conservative margin between the Technical Specifications (TS) limits of usable fuel oil proposed in TS Bases Table B3.8.3-1, and the actual amount of usable fuel oil required to meet the associated diesel generator's safety function. Furthermore, Figures 1 through 4 show that the proposed TS limits are conservative across the entire band of API gravities allowed by the LSCS Diesel Fuel Oil Testing Program.

236000 235000 234000 a 233000 231000 230000 229000 228000 227000 Attachment Response to NRC Request for Additional Information Page 1 of 15 39 38 37 36 35 34 33 32 31 30 29 28 27 Fuel Oil API Gravity Figure 1 : Division 1 and 2 Diesel Generator 7 Day Usable Fuel Oil Requirements Required (S15 50T) Usable Fuel Oil (Ibm)

- - - TS Fuel Oil Limit (32, 200 gal 7.305 Ibrn'gal) (Ibm)

200000-E N

N td g O

G1 IL 202000 201000 199000 Attachment Response to NRC Request for Additional Information Figure 2: Division 1 and 2 Diesel Generator 6 Day Usable Fuel Oil Requirements 198000-197000 ;

196000-195000 II~

r--,--r-T T-,--

39 38 37 36 35 34 33 32 31 30 29 28 27 Fuel Oil API Gravity 219000 217000 215000 213000-211000 -j 209000 207000 205000 39 38 37 36 35 34 33 32 31 30 29 28 27 Fuel API Gravity Figure 3 : Division 3 Diesel Generator 7 Day Usable Fuel Oil Requirements Page 2 of 15 Required (S15 @ 50

°F) Usable Fuel Oil (Ibm)

- - TS Fuel Oil Lirrit (27, 600 gal 7.305 Ibrn'gal) (Ibm)

Required (S15 50 °F)

Usable Fuel Oil (Ibm)

TS Fuel Oil Limit (30, 000 gal 7.305 Ibrrdgal)

(Ibm)

189000

~ 187000 11 185000 M

! 183000 -

181000-W 179000 -

Attachment Response to NRC Request for Additional Information 177000 39 38 37 36 35 34 33 32 31 30 29 28 27 Fuel Oil API Gravity Page 3 of 15 Figure 4: Division 3 Diesel Generator 6 Day Usable Fuel Oil Requirements Required (S15 @ 50 T) Usable Fuel Oil (Ibm)

TS Fuel Oil Limit (25, 900 gal @

7.305 bfrVgal) 06 44! --It

Attachment Response to NRC Request for Additional Information Question #2 In Section 3.0 (page 4 of 11) it is stated that "EGC in its evaluations used a 1 % reduction in energy content for ULSD compared to the diesel fuel that was used as the basis in the design of LSCS. " Provide the bases for the 1 % reduction value, and provide justification as to why it is a conservative value.

Response

It is well-known that the National Bureau of Standards developed a correlation between fuel oil API Gravity and energy content in 1933. This relationship is shown in Table 1. At LSCS, required fuel oil storage values were calculated using the most limiting API gravity, and therefore the most limiting fuel energy content. As long as the fuel oil placed in the storage tanks is within the API gravity band allowed by the LSCS Diesel Fuel Oil Testing Program, the calculations of fuel consumption and required stored volume remain valid.

Table 1 :

Typical Gross Heat Content of Diesel Fuel from Bureau of Standards, Miscellaneous Publication No 97; Thermal Properties of Petroleum Products, April 28, 1933 Additionally, to determine the impact of the use of ULSD or S15 at all of its nuclear stations, EGC conducted an evaluation of the heat content of ULSD. To assess the impact on heat content, or the gross heat content (higher heating value (HHV)) of S15, fuel from different regions of the United States was collected from various stations and diesel fuel oil suppliers, and analyzed using ASTM methodology. The purpose of these analyses was to determine the actual heat content of the ULSD. The results of these analyses were compared to the gross heat content of typical diesel fuel oil. Table 1 shows the gross heat content of typical fuel oil as provided by the Bureau of Standards.

Page 4 of 15 API Gross Heat Content (BTU/gal) 44 133500 42 134700 40 135800 38 137000 36 138200 34 139400 32 140600 30 141800 28 143100 26 144300 24 145600 22 146800 20 148100 18 149400 16 150700 14 152000 12 153300 L

10 154600

Table 2 shows the results of the heat content analyses of ULSD fuel samples from across the Unites States.

The heat content of the samples in Table 2 was compared to typical heat content values of legacy fuels found in Table 1. This comparison is shown graphically in Figure 5 below.

c 0

x x

Table 2 :

Ultra-Low Sulfur Diesel Fuel Oil (S15) Sample Heat Content Results 160000-150000 140000-130000-120000-110000-100000-Attachment Response to NRC Request for Additional Information 0

10 20 30 40 50 AN Gravity Figure 5: Typical Diesel Fuel Gross Heating Value Compared ULSD (S15) Heating Value Page 5 of 15 Typical Diesel Fuel ULSD (S15)

ULSD (S15)

Fuel Sample API Gravity S15 Gross Heat Content BTU/Gal ULSD (S15)

Fuel Sample API Gravity S15 Gross Heat Content BTU/Gal 1

41.8 134500 15 36.4 137471 2

38.6 136221 16 36.3 138174 3

38.1 136843 17 36.1 135833 4

37.9 136924 18 36 134619 5

37.8 137357 19 35.8 138211 6

37.8 136648 20 35.7 138700 7

37.7 137171 21 35.3 139600 8

37.7 139167 22 35.3 136023 9

37.6 138404 23 34.7 139250 10 37.5 137238 24 34.7 141394 11 37.5 133786 25 34.5 138504 12 37.4 137050 26 34 141711 13 37 137721 27 32.3 138878 1 4 36.4 136930 28 32.1 139763

Attachment Response to NRC Request for Additional Information The collected S15 gross heat content data shows some variations for the similar API gravity.

The data scatter in Figure 5 is likely due to differences in base oil stock and refining processes among fuel oil refineries, as well as testing accuracies. The tests were performed in accordance with either ASTM D-4809 or ASTM D-240. The Table 2 data shows that the gross heat content results for all the samples as a function of API gravity is consistent with the predictions of ASTM D-4868 and NBS Publication 97 data shown in Table 1. This analysis supports the claim that the heat content of S15 fuel is only marginally different than that of the older fuels with higher sulfur content.

Moreover, literature from Exxon Mobile Corporation and BP, the preferred suppliers for the fuel oil delivered to LSCS, report that S15 fuel is expected to have approximately a 1 % reduction in fuel economy caused when compared to higher sulfur content (S500) fuel. Corporate publications from Marathon Oil Corporation and Chevron Corporation confirm that a 1 reduction in fuel economy is typical (this information is available on the respective company websites). Figure 5 demonstrates that the results of analyses performed by EGC are consistent with these claims.

Question #3 In Section 4.0 (page 6 of 11) it is stated that "The TS requirements for fuel oil inventory at LSCS have been determined using fuel oil consumption rates as provided by the specific engine manufacturer. " Are these fuel oil consumption rates provided by the manufacturer applicable for ULSD fuel? If so, it should be stated in the request.

Response

The diesel engines at LSCS were purchased in the late 1970s and early 1980s, and data provided by the specific engine manufacturer would not reflect the use of ULSD fuel oil. As stated in the amendment request, fuel oil consumption rates provided by the specific engine manufacturer were conservatively modified to account for a 1 % reduction in fuel oil energy content to account for the use of ULSD.

Page 6 of 15

Attachment Response to NRC Request for Additional Information Question #4 Provide the calculation(s) that determined the fuel oil volumes in Table B3.8.3-1.

Response

The Technical Specification 3.8.3 Bases 7 day and 6 day Onsite Usable Fuel Storage Volume Requirements were determined as follows:

Division 1 and 2 EDG 7 Day Onsite Usable Fuel Storage_ Requirement The new Technical Specification 3.8.3 Bases 7 day onsite usable fuel storage requirements for the Division 1 and 2 EDG is calculated as follows:

The Division 1 and 2 EDG fuel bounding required pound-mass is 247444 pounds for ULSD S15 API Gravity 27 fuel at 50 °F per Table 3 below. This is the total mass in the combined storage tank and day tank (unusable plus usable fuel mass). Table 3 states the Division 1 and 2 EDG fuel mass required to support 7 days of continuous EDG operation at rated load or rated bhp is 232600 pounds, which is the bounding usable fuel mass.

Page 7 of 15

Attachment Response to NRC Request for Additional Information Table 3 : Total Division 1 and Division 2 Fuel Oil Consumption and Storage Requirements for API 27 through API 39 Fuel Oil at 50 °F and 122 °F Page 8 of 15 FOR S15 ULSD FUEL at 50°F API SG @ 50°F Fuel Density Ibs/ al HHV @

50°F Btu/Ib Fuel (S15)

Consumption Rate (Ib/bhp-hr Div 1 & 2 S15 Consumption at Rated bhp for 7-day Continuous Ibs Div 1 & 2 S15 Consumption at Rated bhp for 7-day Continuous (gals)

Div1 &2S15Div1 Consumption at Rated bhp for 50 minutes Continuous Ibs

&2815 Consumption at Rated bhp for 50 minutes Continuous (gals)

Div 1 & 2 Unusable Volume -

Day Tank Volume Div 1 & 2 Required Volume for S15 (gals)

Div 1 & 2 Required Weight of S15 Fuel Ibs 40 0.8284 6.907 19725 39 0.8333 6.947 19695 0.3721 227766 32786 1130 163 1987 34773 241570 38 0.8381 6.987 19664 0.3727 228121 32647 1132 162 1987 34634 242005 37 0.8431 7.029 19632 0.3733 228489 32506 1133 161 1987 34493 242456 36 0.8481 7.071 19601 0.3739 228862 32367 1135 161 1987 34354 242911 35 0.8532 7.113 19568 0.3745 229245 32228 1137 160 1987 34215 243379 34 0.8583 7.156 19535 0.3752 229631 32090 1139 159 1987 34077 243850 33 0.8635 7.199 19501 0.3758 230028 31952 1141 158 1987 33939 244333 32 0.8687 7.243 19467 0.3765 230430 31816 1143 158 1987 33803 244820 31 0.8741 7.288 19432 0.3772 230850 31677 1145 157 1987 33664 245330 30 0.8795 7.333 19396 0.3779 231274 31541 1147 156 1987 33528 245844 29 0.8850 7.378 19360 0.3786 231707 31405 1149 156 1987 33392 246367 28 0.8904 7.423 19323 0.3793 232143 31272 1152 155 1987 33259 246894 27 0.8961 7.471 19285 0.3800 232600 31136 1154 154 1987 33123 247444 26 0.9017 7.518 19247 FOR S15 ULSD FUEL at 122°F API SG @ 122°F Fuel Density @ 122°F Ibs/ al HHV @

122°F Btulb Fuel (S15)

Consumption Rate (Ib/bhp-hr Div 1 & 2 S15 Consumption at Rated bhp for 7-day Continuous Ibs Div 1 & 2 S15 Consumption at Rated bhp for 7-day Continuous (gals)

Div1&2S15Div1&2S15 Consumption at Rated bhp for 50 minutes Continuous Ibs Consumption at Rated bhp for 50 minutes Continuous (gals)

Div 1 & 2 Unusable Volume -

Day Tank Volume Div 1 & 2 Required Volume for S15 (gals)

Div 1 & 2 Required Weight of S15 Fuel Ibs 40 0.8044 6.706 19874 39 0.8093 6.747 19844 0.3693 226054 33505 1121 166 1987 35492 239460 38 0.8141 6.787 19814 0.3699 226394 33355 1123 165 1987 35342 239881 37 0.8191 6.829 19783 0.3705 226748 33204 1125 165 1987 35191 240317 36 0.8241 6.871 19752 0.3710 227105 33054 1127 164 1987 35041 240757 35 0.8292 6.913 19720 0.3716 227472 32904 1128 163 1987 34891 241208 34 0.8343 6.956 19688 0.3722 227842 32756 1130 162 1987 34743 241663 33 0.8395 6.999 19655 0.3729 228224 32608 1132 162 1987 34595 242131 32 0.8447 7.042 19622 0.3735 228608 32461 1134 161 1987 34448 242602 31 0.8501 7.087 19588 0.3742 229011 32312 1136 160 1987 34299 243094 30 0.8555 7.132 19553 0.3748 229418 32165 1138 160 1987 34152 243591 29 0.8610 7.178 19518 0.3755 229833 32019 1140 159 1987 34006 244096 28 0.8664 7.223 19482 0.3762 230252 31876 1142 158 1987 33863 244604 27 0.8721 7.270 19445 0.3769 230690 31730 1144 157 1987 33717 245136 26 0.8777 7.318 19408

The bounding usable fuel mass (ULSD API Gravity 27 fuel at 50 °F) is converted to ULSD API Gravity 30 fuel at 60 °F. This is performed by dividing the mass of ULSD API Gravity 27 fuel at 50 °F by the density of ULSD API Gravity 30 fuel at 60 °F. The fuel density of ULSD API Gravity 30 fuel at 60 °F is 7.305 pounds/gallon.

The volume of API Gravity 30 fuel at 60 °F is :

Volume (Div 1 and 2 EDG ULSD API 30 @ 60 °F) = fuel mass / density

= 232600 pound / 7.305 pound/gal

= 31841.205 gallons An engineering margin of 1 % is added to this volume:

Volume (Div 1 and 2 EDG ULSD API 30 @ 60 °F, with 1 % margin)

= 31841.205 gal

• 1.01

= 32160 gallons Attachment Response to NRC Request for Additional Information The volume of 32160 gallons is rounded up to the next 100 gallons, which results in a volume of 32200 gallons. This volume (32200 gallons) is the new Technical Specification Bases 7 day onsite usable fuel storage requirements for the Division 1 and 2 EDG.

Division 1 and 2 EDG 6 Day Onsite Usable Fuel Storage Requirement The new Technical Specification 3.8.3 Bases 6 day onsite usable fuel storage requirements for the Division 1 and 2 EDG is calculated as follows :

The Division 1 and 2 EDG fuel bounding required pound-mass is 214216 pounds for ULSD S15 API Gravity 27 fuel at 50 °F per Table 4. This is the total mass in the combined storage tank and day tank (unusable plus usable fuel mass). Table 4 states the Division 1 and 2 EDG fuel mass required to support 6 days of continuous EDG operation at rated load or rated bhp is 199372 pounds, which is the bounding usable fuel mass.

Page 9 of 15

Attachment Response to NRC Request for Additional Information Table 4 : Div 1 and 2 Fuel Requirements for 6 Days EDG Operation The bounding usable fuel mass (ULSD API Gravity 27 fuel at 50 °F) is converted to ULSD API Gravity 30 fuel at 60 °F. This is performed by dividing the mass of ULSD API Gravity 27 fuel at 50 °F by the density of ULSD API Gravity 30 fuel at 60 °F. The fuel density of ULSD API Gravity 30 fuel at 60 °F is 7.305 pounds/gallon.

Page 1 0 of 15 Determining density, fuel usage and storage at different SG and tem eratures :

For AN 29.3 at 0°F the s = 0.900 and at 150°F the s =0.850.

API

@ 0°F 060°F X1 50°F sg/°F change in sg c@

50°F change in sg 122°F 29.30 0.9000 0.8 0.8500 0.0003 0.0033

-0.0207 o determine the HHV at different temperatures :

AN SG @

60°F SG @

50°F SG @

122°F HHV 60oF(Btu/Ib)

HHV @

50°F(Btu/Ib)

HHV @

122°F (Btu/Ib)

Fuel Density @

50°F (Ibs/gal)

Fuel Density (@

122°F (Ibs/gal) 40 0.8251 0.8284 0.8044 19750 19725 19874 6.907 6.706 39 0.8300 0.8333 0.8093 19715 19694 19844 6.947 6.747 30 0.8762 0.8795 0.8555 19420 19396 19553 7.333 7.132 29 0.8817 0.8850 0.8610 19385 19360 19518 7.378 7.178 28 0.8871 0.8904 0.8664 19350 19323 19482 7.423 7.223 27 0.8928 0.8961 0.8721 19310 19285 19445 7.471 7.270 26 0.8984 0.9017 0.8777 19270 19247 19408 7.518 7.318 API SG Fuel Density (Ibs/gal)

HHV 0°F(Btu/Ib)

Consumpt.

Rate @ 50°F (Ib/bhp-hr)

Div 1 &2 Consumption @

Rated bhp 0 50°F for 6-day Continuous (Ibs)

Div 1 &2 Consumption

@ Rated bhp

@ 50°F for 6-day Continuous als Div 1 &2 Consumption 0 Rated bhp @

50°F for 50 min.

Continuous (Ibs)

Div 1&2 Consumption Cg Rated bhp

@50°F 50 min.Cont. (gals)

Div 1 &2 Unusable Vol.

@ 50°F-Day Tank Vol.(gals)

Div 1 &2 Required Vol 95 (gals)

Div 1 &2 Required Wt @

0°F Fuel (Ibs)

FOR S500 FUEL @ 50°F 30 0.8795 7.333 19396 0.3741 196272 26767 1136 155 1987 28754 210842 27 0.8961 7.471 19285 0.3763 197398 26423 1142 153 1987 28410 212242 FOR S15 ULSD FUEL at 50°F 27 0.8961 7.471 19285 0.3800 199372 26688 1154 154 1987 28675 214216 FOR S15 ULSD FUEL at 122°F 39 0.8093 6.747 19844 0.3693 193764 28717 1121 166 1987 30704 207171

The volume of API Gravity 30 fuel at 60 °F is :

Volume (Div 1 and 2 EDG ULSD API 30 C<<3 60 °F) = fuel mass / density

= 199372 pound / 7.305 pound/gal

= 27293 gallons An engineering margin of 1 %

is added to this volume:

Volume (Div 1 and 2 EDG ULSD API 30 @ 60 °F, with 1 % margin) = 27293 gal

• 1.01

= 27566 gallons Attachment Response to NRC Request for Additional Information The volume of 27566 gallons is rounded up to the next 100 gallons, which results in a volume of 27600 gallons. This volume (27600 gallons) is the new Technical Specification Bases 6 day onsite usable fuel storage requirements for the Division 1 and 2 EDG.

Division 3 EDG 7 Day Onsite Usable Fuel Storage Requirement The new Technical Specification 3.8.3 Bases 7 day onsite usable fuel storage requirements for the Division 3 EDG is calculated as follows :

The Division 3 fuel bounding pound-mass is 212813 pounds for ULSD S15 API Gravity 27 fuel at 50 °F per Table 5. This is the total mass in the combined storage tank and day tank (unusable plus usable required fuel mass). Table 5 states the Division 3 EDG fuel mass required to support 7 days of continuous EDG operation at maximum expected load profile is 211431 pounds, which is the bounding usable fuel mass.

Page 1 1 of 15

Attachment Response to NRC Request for Additional Information Table 5 : Total Division 3 ULSD Fuel Oil Consumption and Storage Requirements for API 27 through API 39 Fuel Oil at 50 °F and 122 °F Page 12 of 15 FOR S15 ULSD FUEL at 50°F API SG 50°F Fuel Density Ibs/ al HHV @

50°F Btu/lb Fuel (S15)

Consumption Rate (Ib/bhp-hr Fuel (S15)

Consumption at 100% (eff 95.7%) Rated bhp and 0 50F for 50 min Ibs Fuel (S15)

Consumption at 100% (eff 95.7%) Rated bhp and @

50°F for 50 min (gals)

Div3 Fuel (S15)

Consumption at 100%

Rated bhp and @ 50°F for 25 hrs (gals)

Div 3 Fuel (S15)

Consumption t 2322 kw for 143 hrs (7days' 24hr/day -25 hrs) at 50°F (gals)

Div 3 Grand Total Fuel (S15)

Consumption

@ 50°F (gals)

Div 3 Grand Total Fuel (S15)

Consumption

@ 50°F Ibs Div 3 Unusable Tank Vol +

Day Tank Vol (gals)

Div 3 Required Volume for S15 (a 50°F (gals)

Div 3 Required Weight of S15 0°F Fuel Ibs 40 0.8284 6.907 19725 39 0.8333 6.947 19695 0.3721 1130 163 4879 24923 29802 207036 185 29987 208322 38 0.8381 6.987 19664 0.3727 1132 162 4858 24818 29676 207359 185 29861 08652 37 0.8431 7.029 19632 0.3733 1133 161 4837 24710 29548 207694 185 29733 08995 36 0.8481 7.071 19601 0.3739 1135 161 4817 24605 29421 208032 185 29606 09341 35 0.8532 7.113 19568 0.3745 1137 160 4796 24499 29294 208381 185 29479 09697 34 0.8583 7.156 19535 0.3752 1139 159 4775 24394 29169 208732 185 29354 10056 33 0.8635 7.199 19501 0.3758 1141 158 4755 24289 29044 209093 185 29229 10425 32 0.8687 7.243 19467 0.3765 1143 158 4735 24186 28920 209458 185 29105 10798 31 0.8741 7.288 19432 0.3772 1145 157 4714 24080 28794 209840 185 28979 11188 30 0.8795 7.333 19396 0.3779 1147 156 4694 23977 28670 210226 185 28855 11582 29 0.8850 7.378 19360 0.3786 1149 156 4673 23873 28547 210619 185 28732 119 28 0.8904 7.423 19323 0.3793 1152 155 4654 23772 28426 211015 185 28611 12389 27 0.8961 7.471 19285 0.3800 1154 154 4633 23669 28302 211431 185 28487 1281 26 0.9017 7.518 19247 FOR S15 ULSD FUEL at 122°F API SG C4+

122°F Fuel Density

@ 122°F Ibs/ al HHV @

122°F Btu/Ib Fuel (S15)

Consumption Rate (Ib/bhp-hr Fuel (S15)

Consumption at 100% (eff 95.7%) Rated bhp and @

122F for 50 min fibs)

Fuel (S15)

Consumption at 100% (eff 95.7%) Rated bhp and @

122°F for 50 min (gals)

Div3 Fuel (S15)

Consumption at 100%

Rated bhp and @ 122°F for 25 hrs (gals)

Div 3 Fuel (S15)

Consumption t 2322 kw for 143 hrs (7days' 24hr/day -25 hrs) at 122°F (gals)

Div 3 Grand Total Fuel (S15)

Consumption

@ 122°F (gals)

Div 3 Grand Total Fuel (S15)

Consumption

@ 122°F lbs Div 3 Unusable Tank Vol +

Day Tank Vol (gals)

Div 3 Required Volume for S15@

122°F (gals)

Div 3 Required Weight of S15 122°F Fuel Ibs 40 0.8044 6.706 19874 39 0.8093 6.747 19844 0.3693 1121 166 4986 25470 30455 205481 185 30640 06729 38 0.8141 6.787 19814 0.3699 1123 165 4964 25356 30320 205790 185 30505 07045 37 0.8191 6.829 19783 0.3705 1125 165 4941 25241 30182 206111 185 30367 07375 36 0.8241 6.871 19752 0.3710 1127 164 4919 25127 30046 206435 185 30231 07707 35 0.8292 6.913 19720 0.3716 1128 163 4896 25013 29909 206769 185 30094 08048 34 0.8343 6.956 19688 0.3722 1130 162 4874 24900 29775 207106 185 29960 0839 33 0.8395 6.999 19655 0.3729 1132 162 4852 24788 29640 207452 185 29825 08747 32 0.8447 7.042 19622 0.3735 1134 161 4831 24676 29507 207802 185 29692 09105 31 0.8501 7.087 19588 0.3742 1136 160 4808 24563 29371 208169 185 29556 09480 30 0.8555 7.132 19553 0.3748 1138 160 4786 24451 29238 208539 185 29423 09858 29 0.8610 7.178 19518 0.3755 1140 159 4765 24340 29105 208915 185 29290 10243 28 0.8664 7.223 19482 0.3762 1142 158 4743 24231 28975 209296 185 29160 10632 27 0.8721 7.270 19445 0.3769 1144 157 4722 24120 28842 209694 185 29027 11039 1 26 0.87771 7.318 19408

Attachment Response to NRC Request for Additional Information The bounding usable fuel mass (ULSD API Gravity 27 fuel at 50 °F) is converted to ULSD API Gravity 30 fuel at 60 °F. This is performed by dividing the mass of ULSD API Gravity 27 fuel at 50 °F by the density of ULSD API Gravity 30 fuel at 60 °F. The fuel density of ULSD API Gravity 30 fuel at 60 °F is 7.305 pounds/gallon.

The volume of API Gravity 30 fuel at 60 °F is :

Volume (Div 3 EDG ULSD API 30 CC 60 °F) = fuel mass / density

= 211431 pound / 7.305 pound/gal

= 28943 gallons An engineering margin of 1000 gallons is added to this volume, which complies with UFSAR Section 9.5.4.1.1.d.3 :

Volume (Div 3 EDG ULSD API 30 @ 60 °F, with margin) = 28943 gal + 1000 gal

= 29943 gallons The volume of 29943 gallons is rounded up to the next 100 gallons, which results in a volume of 30000 gallons. This volume (30000 gallons) is the new Technical Specification Bases 7 day onsite usable fuel storage requirements for the Division 3 EDG.

Division 3 EDG 6 Day Onsite Usable Fuel Storage Requirement The new Technical Specification 3.8.3 Bases 6 day onsite usable fuel storage requirements for the Division 3 EDG is calculated as follows:

The Division 3 fuel bounding required pound-mass is 183137 pounds for ULSD S15 API Gravity 27 fuel at 50 °F per Table 6. This is the total mass in the combined storage tank and day tank (unusable plus usable fuel mass). Table 6 states the Division 3 EDG fuel mass required to support 6 days of continuous EDG operation at maximum expected load profile is 181755 pounds, which is the bounding usable fuel mass.

Page 13 of 15

Attachment Response to NRC Request for Additional Information Table 6: Div 3 Fuel requirements for 6 days EDG operation The bounding usable fuel mass (ULSD API Gravity 27 fuel at 50 °F) is converted to ULSD API Gravity 30 fuel at 60 °F. This is performed by dividing the mass of ULSD API Gravity 27 fuel at 50 °F by the density of ULSD API Gravity 30 fuel at 60 °F. The fuel density of ULSD API Gravity 30 fuel at 60 °F is 7.305 pounds/gallon.

Page 14 of 15 Determining density, fuel usage and storage at different SG and temperatures 50 and 122°F For API 29.3 at 0°F the s = 0.900 and at 150°F the s =0.850.

[API

@ 0°F

@ 60°F

@ 150°F sg/°F change in sg 50°F change in sg C4 122°F 0.9000 0.8 0.8500 0.0003 0.0033

-0.0207 o determine the HHV at different temperatures.

API SG 60°F SG 50°F SG 0 122°F HHV 0 60°F (Btu/Ib)

HHV 50°F (BtuAb)

HHV @

122°F (Btu/Ib)

Fuel Density

@ 50°F (Ibs/ga Fuel Density 122°F Ibs/ al 40 0.8251 0.8284 0.8044 19750 19725 19874 6.907 6.706 39 0.8300 0.8333 0.8093 19715 19695 19844 6.947 6.747 30 0.8762 0.8795 0.8555 19420 19396 19553 7.333 7.132 29 0.8817 0.8850 0.8610 19385 19360 19518 7.378 7.178 28 0.8871 0.8904 0.8664 19350 19323 19482 7.423 7.223 27 0.8928 0.8961 0.8721 19310 19285 19445 7.471 7.270 26 0.8984 0.9017 0.8777 19270 19247 19408 7.518 7.318 API SG 50°F Fuel Density (Ibs/gal)

HHV @

50°F (BtuJb)

Fuel (S500)

Consumption Rate 50F (Ib/bhp-hr)

Div3 Fuel Cons ~

1 00% (eff 95.7%) Rated bhp @

50°F for 50 min (Ibs)

Div3 Fuel Cons ~

100% (eff 95.7%) Rated bhp @ 50°F for 50 min (gals)

Div 3 Fuel Cons. @

100% Rated bhp 50°F for 2

25 hrs (gals)

Div 3 Fuel Cons 2322 kw for 119 hrs (6

24 hr -25

-25 hrs)

@50F (gals)

Div 3 Grand Total Fuel Consumption 50F (gals)

Div 3 Grand Total Fuel Consumption 50F (Ibs)

Div3 Unusable Tk Vol -

Day Tk Vol (gals)

Div 3 Required Vol 50°F (gals)

Div 3 Required Weight a 50°F (Ibs)

OR S500 FUEL @ 50°F 30 0.8795 7.333 19396 0.3741 1136 155 4647 19755 24402 178930 185 24587 180286 27 0.8961 7.471 19285 0.3763 1142 153 4587 19501 24089 179956 185 24274 181338 OR S15 ULSD FUEL at 50°F 27 0.8961 7.471 19285 0.3800 1154 154 4633 19696 24330 181755 185 24515 183137 OR S15 ULSD FUEL at 122°F 39 0.80931 6.747 19844 0.3693 1121 166 4986 21195 26181 176640 1 85 26366 177888

Attachment Response to NRC Request for Additional Information The volume of API Gravity 30 fuel at 60 °F is :

Volume (Div 3 EDG ULSD API 30 @ 60 °F) = fuel mass / density

= 181755 pound / 7.305 pound/gal

= 24881 gallons An engineering margin of 1000 gallons is added to this volume, which complies with UFSAR Section 9.5.4.1.1.d.3 :

Volume (Div 3 EDG ULSD API 30 @ 60 °F, with margin) = 24881 gal + 1000 gal

= 25881 gallons The volume of 25881 gallons is rounded up to the next 100 gallons, which results in a volume of 25900 gallons. This volume (25900 gallons) is the new Technical Specification Bases 6 day onsite usable fuel storage requirements for the Division 3 EDG, and is provided in Table 7 below.

Table 7 :

Div 1, 2, and 3 EDG New Technical Specification 3.8.3 Bases Onsite Usable Fuel Oil Volume Page 15 of 15 EDG Seven-day Usable Fuel Six-day Usable Fuel Supply Su ",I New New Division 1 32200 gallons 27600 gallons and 2 Division 3 30000 gallons 25900 gallons