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{{#Wiki_filter:il5 , a NRC -Luminant Power Public Meeting Comanche Peak Nuclear Power Plant Secondary Line Breaks July 9th 2009 Secondary Line Breaks* Containment Spray provides containment heat removal -maximum 10 hour mission time for equipment qualification.
{{#Wiki_filter:a il5 ,
Decay heat removal is by the secondary systems (not by ECCS, i.e., 50.46)* GDC-38 and GDC-41 do not apply Containment Spray is not credited for Part 100 RG 1.82 R3" "Some PWRs may require recirculation from the sump for licensing basis events other than LOCAs. Therefore, plants should review the licensing basis and include potential break locations in the main steam and main feedwater lines as well in determining the most limiting conditions for sump operation."* GDC-4 is the Comanche Peak licensing basis for secondary line breaks* CPNPP elected to evaluate sump performance using the same break selection criteria as for LOCA.Comparison of Fiber Load Fibrous MSLB (lbs) Prototype (lbs) LOCA (lbs) Bounded Latent Fiber 24 30 24 Yes LDFG Fines 42.6 53.8 Yes LDFG Smalls 160 540.75 183 Yes LDFG Large 18.4 LDFG Intact 18.6 Kaowool 353.6 448.8 Prototype Sil-temp 52.4 71.4 Prototype Min-K 12.96 8 1.6 No Covers 27.2 Total 645.6 1099 218.8 Prototype Comparison of Particulate Load MSLB (lbs) Prototype (lbs) LOCA (lbs) Bounded Dirt/Dust 136 170 136 Yes Min-K Fines 52.16 34.3 lbs 6.72 No Acceptable Epoxy 217.5 3860.9 262.9 Yes Acceptable IOZt 366.9 267.5 376 Yes Unqualified Epoxy 2838 (6 mil) 12920 lbs as 2838 (6 mil) Yes.(outside ZOI) particulate fines (walnut shells)Unqualified IOZ Yes (outside ZOI) 16834 25634 16834 Unqualified Alkyd Yes (outside ZOI) 104 992 104 Total 20, 549 43,879 20,557.6 Yes Prototype (small flume) Testing* Ultra-Conservative test temperature  
NRC - Luminant Power Public Meeting Comanche Peak Nuclear Power Plant Secondary Line Breaks July 9th 2009 Secondary Line Breaks
-< 50 F" Fiberglass fibers settle in 20 to 60 minutes in 50 F water versus 20 to 30 seconds in 120 F water[NUREG/CR-2982, "...water temperature has a paramount effect on buoyancy..."]
*Containment Spray provides containment heat removal - maximum 10 hour mission time for equipment qualification.
* Tests conducted at 128 F and 169 F confirmed the effect on settling of fiberglass
Decay heat removal is by the secondary systems (not by ECCS, i.e., 50.46)
[Test Report No. ITR-92-03N]* MSLB Head Loss -Small Flume 0.005 ft. (0.0044 fps)* LOCA Head Loss -Small Flume 0.4682 ft. (0.0073 fps)* LOCA Head Loss -Large Flume 0.6 ft. (0.0073 fps)RAI 13 Conclusion
* GDC-38 and GDC-41 do not apply Containment Spray is not credited for Part 100
* Debris Generation and Transport analyses were performed consistent with the SER for NEI 04-07" Prototype testing showed that LOCA debris loads and conditions bounded the secondary break head loss" Large flume testing under the March 2008 protocol confirmed the the small flume test protocol was conservative for this case" CPNPP has provided reasonable asurrance, that the Containment Spray System wil perform its design function for secondary line breaks}}
 
RG 1.82 R3
" "Some PWRs may require recirculation from the sump for licensing basis events other than LOCAs. Therefore, plants should review the licensing basis and include potential break locations in the main steam and main feedwater lines as well in determining the most limiting conditions for sump operation."
* GDC-4 is the Comanche Peak licensing basis for secondary line breaks
* CPNPP elected to evaluate sump performance using the same break selection criteria as for LOCA.
Comparison of Fiber Load Fibrous       MSLB (lbs) Prototype (lbs) LOCA (lbs) Bounded Latent Fiber 24         30             24         Yes LDFG Fines   42.6                       53.8       Yes LDFG Smalls 160         540.75         183       Yes LDFG Large                               18.4 LDFG Intact                             18.6 Kaowool     353.6       448.8                     Prototype Sil-temp     52.4       71.4                       Prototype Min-K         12.96       8               1.6       No Covers                                   27.2 Total         645.6       1099           218.8     Prototype
 
Comparison of Particulate Load MSLB (lbs)   Prototype (lbs)   LOCA (lbs)   Bounded Dirt/Dust           136         170               136         Yes Min-K Fines         52.16       34.3 lbs         6.72         No Acceptable Epoxy   217.5       3860.9           262.9       Yes Acceptable IOZt     366.9       267.5             376         Yes Unqualified Epoxy   2838 (6 mil) 12920 lbs as     2838 (6 mil) Yes.
(outside ZOI)                       particulate fines (walnut shells)
Unqualified IOZ                                                 Yes (outside ZOI)       16834       25634             16834 Unqualified Alkyd                                               Yes (outside ZOI)       104         992               104 Total               20, 549     43,879           20,557.6     Yes Prototype (small flume) Testing
* Ultra-Conservative test temperature - < 50 F
" Fiberglass fibers settle in 20 to 60 minutes in 50 F water versus 20 to 30 seconds in 120 F water
[NUREG/CR-2982, "...water temperature has a paramount effect on buoyancy..."]
* Tests conducted at 128 F and 169 F confirmed the effect on settling of fiberglass [Test Report No. ITR-92-03N]
* MSLB Head Loss - Small Flume 0.005 ft. (0.0044 fps)
* LOCA Head Loss - Small Flume 0.4682 ft. (0.0073 fps)
* LOCA Head Loss - Large Flume 0.6 ft. (0.0073 fps)
 
===RAI 13===
 
Conclusion
* Debris Generation and Transport analyses were performed consistent with the SER for NEI 04-07
" Prototype testing showed that LOCA debris loads and conditions bounded the secondary break head loss
" Large flume testing under the March 2008 protocol confirmed the the small flume test protocol was conservative for this case
" CPNPP has provided reasonable asurrance, that the Containment Spray System wil perform its design function for secondary line breaks}}

Latest revision as of 04:15, 14 November 2019

Luminant RAI 24 and 37, Secondary Line Breaks, Debris Load and Testing
ML091940085
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 07/09/2009
From:
Luminant Power
To:
Office of Nuclear Reactor Regulation
References
Download: ML091940085 (4)
v • d • e


Text

a il5 ,

NRC - Luminant Power Public Meeting Comanche Peak Nuclear Power Plant Secondary Line Breaks July 9th 2009 Secondary Line Breaks

  • Containment Spray provides containment heat removal - maximum 10 hour1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> mission time for equipment qualification.

Decay heat removal is by the secondary systems (not by ECCS, i.e., 50.46)

RG 1.82 R3

" "Some PWRs may require recirculation from the sump for licensing basis events other than LOCAs. Therefore, plants should review the licensing basis and include potential break locations in the main steam and main feedwater lines as well in determining the most limiting conditions for sump operation."

  • GDC-4 is the Comanche Peak licensing basis for secondary line breaks
  • CPNPP elected to evaluate sump performance using the same break selection criteria as for LOCA.

Comparison of Fiber Load Fibrous MSLB (lbs) Prototype (lbs) LOCA (lbs) Bounded Latent Fiber 24 30 24 Yes LDFG Fines 42.6 53.8 Yes LDFG Smalls 160 540.75 183 Yes LDFG Large 18.4 LDFG Intact 18.6 Kaowool 353.6 448.8 Prototype Sil-temp 52.4 71.4 Prototype Min-K 12.96 8 1.6 No Covers 27.2 Total 645.6 1099 218.8 Prototype

Comparison of Particulate Load MSLB (lbs) Prototype (lbs) LOCA (lbs) Bounded Dirt/Dust 136 170 136 Yes Min-K Fines 52.16 34.3 lbs 6.72 No Acceptable Epoxy 217.5 3860.9 262.9 Yes Acceptable IOZt 366.9 267.5 376 Yes Unqualified Epoxy 2838 (6 mil) 12920 lbs as 2838 (6 mil) Yes.

(outside ZOI) particulate fines (walnut shells)

Unqualified IOZ Yes (outside ZOI) 16834 25634 16834 Unqualified Alkyd Yes (outside ZOI) 104 992 104 Total 20, 549 43,879 20,557.6 Yes Prototype (small flume) Testing

  • Ultra-Conservative test temperature - < 50 F

" Fiberglass fibers settle in 20 to 60 minutes in 50 F water versus 20 to 30 seconds in 120 F water

[NUREG/CR-2982, "...water temperature has a paramount effect on buoyancy..."]

  • Tests conducted at 128 F and 169 F confirmed the effect on settling of fiberglass [Test Report No. ITR-92-03N]
  • MSLB Head Loss - Small Flume 0.005 ft. (0.0044 fps)
  • LOCA Head Loss - Small Flume 0.4682 ft. (0.0073 fps)
  • LOCA Head Loss - Large Flume 0.6 ft. (0.0073 fps)

RAI 13

Conclusion

  • Debris Generation and Transport analyses were performed consistent with the SER for NEI 04-07

" Prototype testing showed that LOCA debris loads and conditions bounded the secondary break head loss

" Large flume testing under the March 2008 protocol confirmed the the small flume test protocol was conservative for this case

" CPNPP has provided reasonable asurrance, that the Containment Spray System wil perform its design function for secondary line breaks

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