2011-03-23 – NRC – Over 9,000 lbs of salt added each day to reactor pressure vessels of Fukushima Daiichi Unit 2 and Unit 3

2011-03-23-nrc-over-9000-lbs-of-salt-added-each-day-to-reactor-pressure-vessels-of-fukushima-daiichi-unit-2-and-unit-3

Leave a Reply

Your email address will not be published. Required fields are marked *

From: RSTO1B Hoc
Sent: Wednesday, March 23, 2011 10:47 AM
To: RST01 Hoc
Subject: FW: Mass energy balance
Attachments: mass balance.ppt
— Original Message —–
From: Versluis, Rob [mailto:[email protected]]
Sent: Tuesday, March 22, 2011 3:55 PM
To: RST01B Hoc
Subject: FW: Mass energy balance
—- Original Message —–
From: Peltz, James On Behalf Of Kelly, John E (NE)
Sent: Tuesday, March 22, 2011 2:37 PM
To: Larzelere, Alex; ‘Elizabeth A Connell’; Binder, Jeff; ‘[email protected]’; Peko, Damian; Beville, Tim; Bisconti,
Giulia; Cook, Trevor; Funk, Dan; Golub, Sal; Hutmaker, Matthew; Kelly, John E (NE); Kendall, Rick; McCaughey, Bill;
McGinnis, Edward; Miller, Tom; O’Connor, Tom (NE-HQ); Peltz, James; Reister, Richard; Schwab, Patrick; Smith-Kevern,
Rebecca; Tyson, Sean; Versluis, Rob; Welling, Craig
Subject: FW: Mass energy balance
FYI
— Original Message—-
From: Farmer, Mitchell T. [mailto:[email protected]]
Sent: Tuesday, March 22, 2011 1:45 PM
To: Grandy, Christopher; Gehin, Jess C.; Busby, Jeremy Todd; Binder, Jeff
Cc: Kelly, John E (NE)
Subject: Mass energy balance
This isn’t pretty I hope it helps.
Mitch
DK 661 of 1892
Mass-Energy Balances
March 21, 12:00 CST
DK 662 of 1892
Where is the water going?
*The sea water that becomes steam is being vented through the reactor safety
relief valve and passing into the suppression pool.
*Without heat sink, the suppression pool is saturated, requiring venting through
the torus pressure relief system.
*Water leaking from the vessel through the recirc pump seals (GE); leakage
collecting in drywell.
*At a seawater pumping rate of 80 gpm (GE), then for the current decay heat
level of,. 6 MWt in Units 2-3, – 25 gpm is going into steam, leaving 55 gpm to
accumulate inth e drywell.
*Drywell is about 1.1 Million gallons in volume, and so drywell will
fill infi ll ina bout two weeks.
*Venting will be required to preclude drywell pressure buildup due
to water injection, and allow more water to be pumped through
the core.
DK 663 of 1892
Salt formation rate
Based on steaming rate, -4,300 kg of salt (or 2 M3) is being added
per day to the RPV for units 2-3.
– Substantial uncertainties; these numbers are bounding
Alternatively, information suggests that the steam might be flowing
out the reactor pressure relief valve, while saturated water (is
draining out the bottom of the core region and through the pump
seals).
So, the system may act as a salt separator with the salt deposited
up on the reactor internals (steam dryers, separators etc) while
saturated coolant flows out the bottom.
– If this is the case then the units should be able to run for a while
using seawater.
DK 664 of 1892
Energy Balances – what is required
coolant flowrate?
Unit Decay Heat (22 March) Required water inlet flowrate for 100 %
saturated steam at core exit and
atmospheric pressure
1 2.8 MW 65 liters/minute
17 gpm
3.9 m3/hr
2-3 6.4 MW 150 liters/minute
40gpm
9 m3/hr
DK 665 of 1892
flowpath
~Stem/V essel Se
J Elericacl
IDkerx a ‘ IN mu .Tmine-.,a
Jet pT ,-e
TO’ O
DK 666 of 1892