ML13150A181: Difference between revisions

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{{#Wiki_filter:Trade-Off Between Tank Vortexing Trade-M i and Margin      d ECCS Function F      ti Volume    Control Tank Refueling g Water Tank Containment Recirculation Sump NRC Meeting On Vortexing              Anderson Lin April 18 18, 2013            Diablo Canyon Power Plant (805) 545-4286 Axle@pge.com
Transfer From VCT to RWST Upon S S signal, signal CCP suctions are aligned to the RWST RWST water level is at the highest to compress any entrained gas from the VCT CCPs are boosted by the RWST static head CCPs are multi-multi-stage pumps tolerate void well (recent tests and Roadmap Report)
If VCT level were increased to prevent any vortex less VCT volume available for charging vortex,
  & letdown inventory control and H2 control
Transfer From the RWST to Sump Transfer From the RWST to Sump For a 40 40 diameter RWST RWST, its it is
  ~9,400 gal/ft.
A conservative 9 requirement to prevent vortexing p              g quarantines q            84,000 gallon of RWST inventory
Transfer From the RWST to Sump RWST inventory is relied upon for core cooling and containment depressurization If too much RWST inventory was reserved to prevent vortexing vortexing, EOP setpoint revision Reduce credited core delta BTU transfer Increase containment post LOCA P / T
Transfer From the RWST to Sump RWST inventory is credited to submerge sump screens Without submerge the sump screens, screen performance would change from pipe pipe flow to channel channel flow Flowrate through the screen relies on water t llevell drops d    inside i id the th screen Lowered the water level inside the sump screen creates even worse vortexing concerns to pump suctions
Transfer From the RWST to Sump RWST inventory to deliver boron for sump pH control Sump pH must beb maintained d 8.0 - 9.5 Too much RWST inventory quarantined in the RWST could result in higher pH Post LOCA equipment qualification may need to be revised
What Would Be A Reasonable Permissible Air Ingestion No Void At All ?
Minimal Sporadic Ingestion ?
2% ?
3% ?
Continuous 1% ?
What is the reasonable air ingestion ?}}

Latest revision as of 05:16, 6 February 2020

Trade-Off Between Tank Vortexing Margin and ECCS Function
ML13150A181
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 11/19/2013
From:
Pacific Gas & Electric Co
To:
Office of Nuclear Reactor Regulation
Warren Lyon
References
Download: ML13150A181 (8)
v • d • e


Text

Trade-Off Between Tank Vortexing Trade-M i and Margin d ECCS Function F ti Volume Control Tank Refueling g Water Tank Containment Recirculation Sump NRC Meeting On Vortexing Anderson Lin April 18 18, 2013 Diablo Canyon Power Plant (805) 545-4286 Axle@pge.com

Transfer From VCT to RWST Upon S S signal, signal CCP suctions are aligned to the RWST RWST water level is at the highest to compress any entrained gas from the VCT CCPs are boosted by the RWST static head CCPs are multi-multi-stage pumps tolerate void well (recent tests and Roadmap Report)

If VCT level were increased to prevent any vortex less VCT volume available for charging vortex,

& letdown inventory control and H2 control

Transfer From the RWST to Sump Transfer From the RWST to Sump For a 40 40 diameter RWST RWST, its it is

~9,400 gal/ft.

A conservative 9 requirement to prevent vortexing p g quarantines q 84,000 gallon of RWST inventory

Transfer From the RWST to Sump RWST inventory is relied upon for core cooling and containment depressurization If too much RWST inventory was reserved to prevent vortexing vortexing, EOP setpoint revision Reduce credited core delta BTU transfer Increase containment post LOCA P / T

Transfer From the RWST to Sump RWST inventory is credited to submerge sump screens Without submerge the sump screens, screen performance would change from pipe pipe flow to channel channel flow Flowrate through the screen relies on water t llevell drops d inside i id the th screen Lowered the water level inside the sump screen creates even worse vortexing concerns to pump suctions

Transfer From the RWST to Sump RWST inventory to deliver boron for sump pH control Sump pH must beb maintained d 8.0 - 9.5 Too much RWST inventory quarantined in the RWST could result in higher pH Post LOCA equipment qualification may need to be revised

What Would Be A Reasonable Permissible Air Ingestion No Void At All ?

Minimal Sporadic Ingestion ?

2% ?

3% ?

Continuous 1% ?

What is the reasonable air ingestion ?

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