March 20th, 2011 – Dose Rates 40 REM/hr – TEPCO looking to make bigger hole in U2

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From: Jackson, Donald
Sent: Sunday, March 20, 2011 7:54 AM
To: Dean, Bill; Lew, David; Wilson, Peter; Roberts,Darrell; Collins, Daniel; Lorson, Raymond; Baker, Pamela; Walker, Tracy; Clifford, James; Miller, Chris; Weerakkody, Sunil
Cc: Screnci, Diane; Sheehan, Neil; Trapp, James; McNamara, Nancy; Tifft, Doug; Hansell, Samuel; Hinson, Felicia; McKinley, Raymond; Rogge, John; Jackson, Donald; Cook, William
Subject: March 20, 2011- 0730- CA Briefing On Japan Reactor Accidents
Attachments: NRC Status Update 3-20 11–0600.pdf

The following is a synopsis of the briefing with changes or noteworthy items underlined:

Status of Fukushima Daiichi Units:

Unit 1-
No Significant Change


Unit 2-
No Significant Change

TEPCO has offsite power to an aux transformer- Working to restore control room envelope and ventilation, and switchgear/pumps/etc


Unit 3-
No Significant Change

External seawater spray applied most of day

Some reports of elevated primary containment pressure- TEPCO may be pursuing venting:


Unit 4-

No Significant Change

Beginning seawater spray soon.. .during day Sunday


Other Issues-

Unit 5 and Unit 6- Both have AC Power

Unit 5 and Unit 6 SFPs Being Positively Cooled

Some dose rate info- Access Gate down to 60mR/hr, Near Unit 3 and 4 down to 15 R/hr, In affected Power blocks- 1 to 5 R/hr

Wind is swinging to the south per forecast

Bechtel spray system still in Perth, Australia there are some loading issues in plane. Single train to still be shipped to Japan today with 2 techs

TEPCO is looking to make a bigger hole in U-2 Sec Ctmt

More at 2000 Sunday

Detailed info in attachment!


MARCH 20, 2011 0600 EDT – FUKUSHIma DAI-ICHI

Units 1, 2, and 3 reactors appear to in a stable condition with seawater injection continuing.

Containment integrity is believed to be intact on Units 1, 2, and 3.

Water continues to be sprayed on the Unit 3 reactor building/spent fuel pool. TEPCO believes the Unit 3 pool can be completely refilled in about 7 more hours. Containment pressure has been reported as “increasing” … TEPCO is monitoring and assesses that this is consistent with ongoing injection activities. NISA indicated that another release may be needed.

The Japanese Self Defense Force plans to resume water injection to the Unit 4 spent fuel pool from the ground level today.

Two diesel generators are running and supplying AC power to Units 5 and 6. A Unit 5 RHR pump, powered by one of the U-6 diesel generators was started and is providing cooling to the Unit 5 spent fuel.

TEPCO is now installing high voltage cables from a nearby transmission line to Units 1&2. Priority is being given to restoring power to RHR and cooling water pumps. Power is expected to be restored to Unit 1 &2 later today. The same kind of cables are planned to be extended to Units 3&4 (perhaps by Monday). DOE Secretary Chu requested update the status of power restoration in advance of his appearance on Sunday morning news programs. The Liaison Team provided an update to DOE.


[quote]

Dose rates around Units 3 and 4 are reducing [was 40 rem/hr, now 15 rem/hr].

Dose rates around Units 5 and 6 are 100 mRem/hr. Dose rates near the power block range from 1 to 5 Rem/hr.

The site access gate was reading 60 mRem/hr (which is about 4000 feet from the plant).

The winds continue to blow from the North West, so the plume is going out to the sea.

A dose rate was recorded to be 12 mRem/Hr at a point 20 km inland from the plant.

All other dose rates 20 to 40 km from the plant are marginally above background.

It was reported that very low levels of radioactive materials were detected in spinach and milk. [Dose rate data provided by industry representatives.]

[/quote]


Still awaiting results from NARAC on “bounding worst case” source term’s potential effects on U.S. Pending these results, NRC’s protective measures team has drafted a more realistic worst case source term that is still being evaluated. Forecast meteorological data for the next 48 hours indicate light wind oscillating on-shore during. the day and off-shore at night.

Participated in conference call with NRC Site Team, TEPCO reps, and INPO to discuss installation of the first train of emergency cooling equipment designed by Bechtel. TEPCO raised several issues regarding logistics for transporting this equipment to the site, equipment assembly, training etc.

In addition, TEPCO also requested additional items including radiation monitoring equipment, protective gear, etc. We are working to address these issues on a high priority basis.

No new overhead imagery has been received.



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