From: Sent: To: Subject: Attachments: RST01 Ho c Monday, April 18, 2011 1:26 PM (b)(6) FW: Answers for the questions on Fukushima Daiich NPS Attachment_2 DWpressure after N2).pdf; Attachment_l pressure).pdf; Attachment 6 water injection).pdf; Attachment_5 Survey map).pdf; AttachmentA(transfer line).pdf; Attachrrient _3 PCVcooling).pdf; Requests for assistance from the DOE.doc; Fukushima questions Apr 15 Answer) .docx DOE documents attached. Boron/seawater evaluation included. Larry Criscione Reactor Safety Team From: Versluis, Rob [mailto: [email protected]] Sent: Thursday, April 14, 2011 10:17 AM To: RSTO1 Hoc Subject: Fw: Answers for the questions on Fukushima Daiich NPS Fy i Rob Versluis +1-301-903-1890 o) b) 6) 3m) From: Kelly, John E NE) To: DL-NERT-AII Sent: Thu Apr 14 10:00:31 2011 Subject: FW: Answers for the questions on Fukushima Daiich NPS From: A, -T- [mailto:[email protected]] Sent: Thursday, April 14, 2011 9:04 AM To: Kelly, John E NE) Cc: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; N = ; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; )z *_Q; ll A; [email protected]; [email protected]; Onishi, Yasuo; [email protected]; [email protected]; hirohide.oikawa@toshiba .co.jp Subject: Answers for the questions on Fukushima Daiich NPS Dear Mr. Kelly, This is Kumano from TEPCO. DK 344 of 1892
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8/12/2019 Exhibit 4 – Answers from DOE in response to TEPCO
The Injection into reactors of Fukushima I U nit 1- 3 is presently continued with use of temporary
pumps driven by the power supplied via the Tohoku EPCs power grid. The followings are being
evaluated and implemented for enhancement of reactor injection reliability; (7 Multiplexing of
Pumps.
(2) Multiplexing of Power Supply and ®MDiversification of Injection Points. (9 Countermeasures for
Tsunami were also evaluated.
(D Multiplexing of Pumps
Current Status:
* Injection is carried out with use of one temporary pump (non-safety) for each plant
respectively.
Measures for Reliabil i ty Enhancement:
* A backup pump for non-safety temporary pump is being prepared. It was Installed on
April 12 and its test operation is planned on April 13 and 14.
* The header is attached to the outlet of the temporary pump w hich forms the line
configuration enabling water delivery using other pump when the pump fails => (Done).
injection by the fire engine is feasible as further backup => (Done).
(2) Multiplexing of Power Supply
Current Status:
* The power is supplied via the Tohoku EPC's power grid.
Reliabil i ty Enhancements:
a, * The temporary pump (non-safety) is powered by the temporary DG If the power from theTohoku EPC's grid is lost => (Done).
* The bus cable connecting the power supply system for Units 1 and 2 (from Tohoku grid)
with that for Units S and 6 (from T E P C O grid) is being installed => (Under Preparation). Two dedicated power supply cars are deployed to supply the power to 6.9kV M/C of Unit
1/2 and Unit 3/4 power supply systems => (From Today)
(M Diversification of Injection Points
Current Status:
f injection for Unit 1 via F / W line is carried out by a temporary pump (Non-safety)
* Injection for Unit 2 and 3 is carried out via fire fire line - low head Injection l ine using a
temporary pump (non-safety).
Reliabil i ty Enhancements:
* Installation of one Injection l ine from F/W line and Increase of F1W l ine injection points
are being prepared. However, there is a concern that about 10 of injection water flow
into the condenser because sufficient boundary configuration is difficult in the high
radiation area.
8/12/2019 Exhibit 4 – Answers from DOE in response to TEPCO
- A temporary pump (non-safety) and a temporary DG are Installed near the deionized
water tank (low elevation). They cannot be accessed dur ing there occurs the Tsunami
warning.Y here Is a possibility that the large scale Tsunami could damage the t empora ry pump,
temporary DG, existing hose, etc.
Reliability Enhancements:
* Relocate Pump Control Panel and temporary DG to higher elevation to enable switchingover to pump star tup ope rat ion and temporary DG even w h e n the Tsunami warning Is
issued.Y he hose reinstallation will be necessary due the damage to the existing hose when th elarge scale Tsunami hits. Thus, the following material and equipment must be procured
and deployed.Fire hose - The 20m x 250 spools already ordered in addit ion to spares present ly
available3- Fire Engines - 10 fire engines are already deployed at higher elevation (by the
seismically Isolated emergency building
3 W ater Source - Headers and others which would facilitate connection of f ire hose
with pipe branch flange between filtered water , pure water tank and filtered water
tankTemporary Pump (non-safety) andTemporary G --Spare units are being preparedto enable existing equivalent facility after securing the power
8/12/2019 Exhibit 4 – Answers from DOE in response to TEPCO
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for Long-term Cooling: Achieve stable core cooling while mitigating release
radioactivity to the environment (atmosphere and ocean)
for 1F-1 (1F-3 would be similar)
* Current assumption: 6ton/hr of water injected in the core is evaporated; some portion ofwhich is released to the atmosphere or T/B with radioactivity.
* Due to external PCV cooling, steam released to the atmosphere accompanying
radioactivity will decrease in 3 months, but will not become zero. (PCV temp.: 112 °C)
* On the other hand, water cooling requires 40ton/hr of injection compared to the current
injection rate of 6ton/hr, leading to increased leakage to T/B.
* Access to R/B is necessary in order to conduct work on injection line for external PCV
cooling.
* Thus, we will increase water level up to TAF, maintain current water injection and, if
possible, prevent external released by early construction of upper roof. U Target externaPCV water cooling in 6 to 7 months when PCV temperature can be maintained below 100
°OC by injection rate of 10ton/hr.
for 1F-2
on closure of suppression pool leakage location by grout or alternativematerial.
*After closure of leakage location, basically same as for 1F-1, 3.
8/12/2019 Exhibit 4 – Answers from DOE in response to TEPCO