April 2nd, 2011 – Reactor 1 uncontrolled depressurization/leak – Dose rate of 27 R/hr found – Radiation Level at Reactor 2 measured over 100 R/hr

Author: No Comments Share:

From: Franovich, Mike
Sent: Saturday, April 02, 2011 12:28 PM
To: Ostendorff, William
Cc: Nieh, Ho; Kock, Andrea; Zorn, Jason
Subject: UPDATE from 08:30 Telecon on Fukushima Daiichi Events
Attachments: image001 .jpg; Major dose assessment matrix_03312011 .xlsx

Leeds led the call

– No change in status of Unit 1, 2, or 3 or the SFPs except one item regarding Unit 1 containment pressure drop. The Unit 1 primary containment pressure has decreased from approx. 25 psig to 9 psig. It appears to be an uncontrolled depressurization/leak. Through Q&A, PMT informed the CAs that drywell is leaking at 10 to 30 volume percent per day.

– Nitrogen inerting/purging of Unit1 containment drywell delayed till no earlier than April 9, if then. Plant high rad/access is problematic to establish inerting capability. From Q&A, RST director noted one key reactor building area has dose rate of 27 R/hr. Tepco may purge without inerting but the urgency to reduce containment pressure may have been negated at this time given the leakage/lowering containment pressure.

– Tepco is not looking to flood any of the Unit 1, 2, or 3 primary containments. Tepco will continue to us bleed makeup and steam venting in a controlled
manner. Tepco feels more comfortable with this approach given plant conditions. (I suspect they have a long-term view incorporating environmental cleanup and securing the plant for commissioning).

– Second fresh water barge being retrofitted with higher capacity pump

– Bechtel single train is available. Second train not needed so no shipment from Australia at this time.

RST Priorities:
1. The NRC/RST updated the SAMG document and was issued as Revision 1. NRC/RST with GEH/INPO/others writing a supplemental paper to the SAMGs to
discuss venting operations (for unit 1).

2. Revision 2 of SAMGs being prepared to include SFP guidance.

3. Answer new question on implications of sustained long-term feed and bled rather than containment flood up.

PMT Priorities:

1. Monitor radiological conditions

2. Continue assessment work with NARAC on Ambassador Roos desire to provide guidance to US citizens returning to Japan/Tokyo after spring break (April 15).

3. Review source term for NARAC on various scenarios (note: source term assumptions/scenarios file is attached which was provided after the telecom.
NRC/DOE/NARAC still seeking White House approval of scenario assumptions/results.

LT Priorities:

1. Continue to coordinate the daily 21:00 consortium calls. It was noted that NRC is not leading this effort, but coordinating each agenda with feedback/input from participants.

2. Continue routing interactions with outside agencies/organizations.

Other Items

– Asked about reports of concrete pumpers/truck being shipped from SRS MOX construction site. Media say a German design concrete pumper will be sent and
that the manufactures pumpers were used to entomb Chernobyl Unit 4. Asked if discussed in consortium call. The ET has no note of the concrete truck being
proposed for Fukushima.

– Asked about Unit 4 Tepco new video footage if the ET/RST has seen the video. RST has seen the 20 minute video and they were not able to ascertain
damage/integrity of the SFP. The RST has asked the in-country team for additional assessment.

News Outside of Telecon:

– Tepco said high-level radioactive water is leaking into the ocean from Unit 2. Tepco said today the source of the leak is from a crack in the wall of a 2-meters deep pit that contains power cables near the reactor’s water intake. Water measuring between 10 and 20 centimeters deep was found in the pit. The radiation level has been measured at over 100 R/hr. Tepco is preparing to pour concrete into the cracked pit to stop the leak.

– Eight monitoring posts to measure radiation levels on the border of the compound started functioning again on Friday for the first time since the
quake/Tsunami struck. However, as the automatic data transmission system is still out of order, workers will make daily visits to collect the radiation data which Tepco will then post on its website.

– Workers are also testing the spraying of synthetic resin in areas around the reactors in the hope that it will contain radioactive materials released by the hydrogen blasts. This resin was reported as Zeolite in a CA telecom, but the press called it something different. (note: Soviets used polymer spray around Chernobyl to reduce tracking of contamination; I shared this with ET during an evening call a few days ago).

– Tap water in Tokyo declared safe again to drink declare J gov officials Ew News reports of mounting public frustration with Tepco openness/transparency

– Story of the day on Reuters …. see link to story/video on miracle Tsunami dog rescue after adrift for three weeks at sea.

http://www.smh.com.au/world/ad rift-tsunami-dog-rescued-from-a-sea-of-debris-20110402-1 cshx. html

Previous Article

JAEA-3, inside of Reactor Building of Unit 2, Fukushima Daiichi Nuclear Power Station

Next Article

Derived Concentrations (pCi/I) of Beta and Photon Emitters in Drinking Water

Leave a Reply