ML18225A138
| ML18225A138 | |
| Person / Time | |
|---|---|
| Site: | 05200046 |
| Issue date: | 08/13/2018 |
| From: | Korea Hydro & Nuclear Power Co, Ltd |
| To: | Office of New Reactors |
| Shared Package | |
| ML18225A136 | List: |
| References | |
| MKD/NW-18-0111L | |
| Download: ML18225A138 (6) | |
Text
06.02.02-43_Rev.1 - 1 / 5 KEPCO/KHNP REVISED RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION APR1400 Design Certification Korea Electric Power Corporation / Korea Hydro & Nuclear Power Co., LTD Docket No.52-046 RAI No.: 520-8693 SRP Section: 06.02.02 - Containment Heat Removal Systems Application Section:
Date of RAI Issue: 09/13/2016 Question No. 06.02.02-43 In RAI 391-8462, Question 06.02.02-35, the staff requested information about the source of the temperature profiles used in the chemical effects analysis, including the treatment of submerged vs. unsubmerged aluminum and the LOCADM calculation for deposition of chemical precipitates on the fuel. The response, dated August 10, 2016 (ML16223A976), described the source of the temperature profiles as DCD Figure 6.2.1-4 extended to 30 days. The response did not identify how the profiles in Figure 6.2.1-4 were extended. Since those profiles end at 106 seconds (approximately 11.6 days), the extended profile has a significant effect on the amount of chemical precipitate calculated for 30 days. Although the response includes a temperature column in the proposed revision to Table 3.8-5 of the APR1400 GSI-191 technical report (APR1400-E-N-NR-14001-NP, Rev. 0, Design Features to Address GSI-191), it does not provide the 30-day pool and containment temperature profiles used in the chemical precipitate calculations. The staff requests the following information:
a) description of how the sump and containment temperature profiles in FSAR Figure 6.2.1-4 were extended from 106 seconds to 30 days, b) a description of how the extension of the temperature profiles was documented, and c) the 30-day sump and containment temperature profiles used in the chemical precipitate calculations.
Response - (Rev. 1) a) During the decay heat phase of a LOCA, which is referred to as the long-term period from the End-of-the Post-Reflood (EOPR) to the end of the transient, the containment pressure and temperature are gradually decreased with a reduction of steaming of the core coolant caused by a decrease in decay heat. In this phase, the IRWST water is continually cooled by heat removal of the containment spray heat exchanger (CSHX) as
06.02.02-43_Rev.1 - 2 / 5 KEPCO/KHNP well. For this phase, the containment and sump temperatures are calculated using the containment analysis model which was developed using the GOTHIC computer code.
The GOTHIC containment model was revised to resolve several issues raised from the response to RAI 296-8342 Question 06.02.01.01.A-3, which was discussed in public teleconferences dated at July 7, 2016, August 9, 2016, and September 2, 2016.
The containment and sump temperature profiles, which were produced from the limiting LOCA that yields the maximum containment pressure, had been used for calculating the chemical effect until the DCD Rev. 1. However, The LOCA containment analysis that yields the highest sump temperature has some differences in the containment initial conditions from that applied to the containment model described in DCD Section 6.2.1 that maximizes the containment pressure. Thus, the containment responses to a LOCA were recalculated with the initial conditions that maximizes the sump temperature and its results has been finally chosen for the chemical effect analysis.
The description of the containment model that yields the highest sump temperature is presented in the Appendix B, Section B.4 of Technical report, APR1400-Z-A-NR-14007-P, Mass and Energy Release Methodologies for LOCA and MSLB, Rev. 2. From the comparison of all LOCA analyses, the scenario that yields highest sump temperature is estimated to the case Double-ended discharge leg slot break with Max. SI flow.
Figure 1 below illustrates the temperature profiles of the containment and sump extended up to 30 days of the accident.
300.0 300 250.0 250 o o 11.6 days 30 days Temperature ( F) Temperature ( F) 200.0 200 IRWST Water Temperature 150.0 150 Containment Air Temperature 100.0 100 0.0 5.0x105 1.0x106 1.5x106 2.0x106 2.5x106 3.0x106 Time (sec)
Figure 1
06.02.02-43_Rev.1 - 3 / 5 KEPCO/KHNP In Figure 2 below, it illustrates the containment pressure and sump temperature responses to the LOCA up to 107 seconds (116 days) with logarithmic scaling for the X-axis.
70.0 400 60.0 Containment pressure 350 Containment Pr.
50.0 39.2 psia @ 17,105 sec 300 o
Pressure (psia) 40.0 IRWST water, Tmax Temperature ( F) 249.49 oF @ 17,105 sec 250 30.0 200 20.0 150 10.0 IRWST water temperature 0.0 100 10-1 100 101 102 103 104 105 106 107 Time (sec)
Figure 2 b) A description of the GOTHIC containment model and how the containment and sump temperatures are calculated during the decay heat phase is provided in detail in the Appendix A of Technical Report, APR1400-Z-A-NR-14007-P, Rev. 2.
c) Based on the revised 30 day containment and sump temperature profiles, the chemical effect analysis has been re-performed and incorporated in Technical Report, APR1400-E-N-NR-14001-P/NP, Rev. 3. Technical Report, Subsections 3.8.2 and 6 have been revised to incorporate the changed assumption of temperature profiles for chemical effect analysis and its reference. Subsection 4.3.2, Tables 3.8-4, 3.8-5, and 4.3-2 have been revised to incorporate the changed IRWST average temperature profiles and calculation results of chemical effects analysis.
Revised chemical effects analysis results do not affect the strainer design and associated testing results, based on the existing test results, as described in the response to RAI 391-8462 Question 06.02.02-35.
The revised temperature profiles for the chemical effect analysis are provided below.
06.02.02-43_Rev.1 - 4 / 5 KEPCO/KHNP Sump Sump Sump Steam or Containment Time (sec) min hr days Temp. Mixed pH Spray pH Temp. (ºF)
(ºF) 1=Yes 10.00001 0 0.00 0 10 120.883 0 10 260.0398 150.0307 2.5 0.04 0 10 131.2436 0 10 268.7843 250.0307 4.2 0.07 0 10 134.3058 0 10 274.9165 350.0307 6 0.10 0 10 139.8727 0 10 276.2973 550.0502 9 0.15 0 10 147.7199 0 10 271.4709 800.0352 13 0.22 0 10 157.3256 0 10 265.6382 1,201.40 20 0.33 0 10 169.8575 0 10 258.1261 1,806.10 30 0.50 0 10 186.8405 0 10 250.27 2,701.97 45 0.75 0 10 206.4409 0 10 243.7442 4,008.25 67 1.11 0 10 223.5439 0 10 239.4057 5,807.90 97 1.61 0 10 235.8982 0 10 237.5173 8,000.68 133 2.22 0 10 243.1143 0 10 237.3219 12,001.01 200 3.33 0 10 248.1351 0 10 237.6717 14,402.60 240 4.00 0 8.5 249.1753 0 8.5 237.5392 17,104.52 285 4.75 0 8.5 249.4851 0 8.5 236.9539 27,012.74 450 7.50 0 8.5 247.2806 0 8.5 233.076 39,022.98 650 10.84 0 8.5 242.0837 0 8.5 226.2202 55,037.62 917 15.29 1 8.5 233.7735 0 8.5 216.1138 80,064.75 1334 22.24 1 8.5 222.4623 0 8.5 202.2903 120,004.10 2000 33.33 1 8.5 210.7919 0 8.5 187.6952 180,013.40 3000 50.00 2 8.5 199.8533 0 8.5 173.0438 250,030.10 4167 69.45 3 8.5 191.9353 0 8.5 161.9907 380,062.30 6334 105.57 4 8.5 181.5331 0 8.5 148.9329 550,079.20 9168 152.80 6 8.5 172.5131 0 8.5 144.0736 800,114.40 13335 222.25 9 8.5 164.513 0 8.5 139.8202 1,200,004.00 20000 333.33 14 8.5 158.2274 0 8.5 136.4261 1,390,009.00 23167 386.11 16 8.5 156.2835 0 8.5 135.3757 1,560,011.00 26000 433.34 18 8.5 154.5565 0 8.5 134.4452 1,730,014.00 28834 480.56 20 8.5 152.8324 0 8.5 133.5195 1,900,015.00 31667 527.78 22 8.5 151.1141 0 8.5 132.5977 2,070,017.00 34500 575.00 24 8.5 149.6763 0 8.5 131.8159 2,240,020.00 37334 622.23 26 8.5 148.9302 0 8.5 131.3985 2,410,022.00 40167 669.45 28 8.5 148.1989 0 8.5 130.9946 2,580,023.00 43000 716.67 30 8.5 147.4718 0 8.5 130.5956 Impact on DCD DCD Tier 2, Table 6.8-3 will be revised to incorporate the updated chemical precipitates quantities, as indicated in Attachment.
Impact on PRA There is no impact on the PRA.
06.02.02-43_Rev.1 - 5 / 5 KEPCO/KHNP Impact on Technical Specifications There is no impact on the Technical Specifications.
Impact on Technical/Topical/Environmental Reports Technical Report, APR1400-E-N-NR-14001-P/NP, Subsections 3.8.2, 4.3.2, and 6, and Tables 3.8-4, 3.8-5, and 4.3-2 have been revised, as indicated in Rev.3.
RAI 520-8693 - Question 06.02.02-43_Rev.1 Attachment (1/1)
APR1400 DCD TIER 2 RAI 520-8693 - Question 06.02.02-43_Rev.1 Table 6.8-3 Design Basis Debris Debris Type Debris Amount Reflective Metal Insulation (RMI) 3.44 / 121.5 (m3/ft3)
Qualified Epoxy Coating 132.2 / 291.4 (kg/lbm)
Latent Debris Particulate 83.9 / 185 (kg/lbm)
Fibers 6.8 / 15 (kg/lbm)
Miscellaneous Note Chemical Aluminum Oxy-hydroxide 180.6 / 398.2 (kg/lbm)
Sodium Aluminum Silicate 4.3 / 9.5 (kg/lbm)
Calcium Phosphate 0.7 / 1.5 (kg/lbm)
Note:
To deal with the quantity of miscellaneous debris, a 9.29 m2 (100 ft2) penalty of sacrificial strainer surface area per sump is applied.
153.6/338.7 (kg/lbm) 4.36/9.60 (kg/lbm) 0.71/1.56 (kg/lbm) 6.8-32 Rev. 2