Japan Earthquake

Japan Earthquake | Page 2318

Seismic trigger worked on other unit and started tape recorder, it had battery backup. This gave no alarm to control room. They have now added a UPS power supply to the Ingdal unit
by lillymunster 9/8/2011 5:40:54 PM

NRC talking about why the instruments the operators depend on didn't function as they should have. Expressing concern to dominion that these items didn't work right.
by lillymunster 9/8/2011 5:41:21 PM

Horizontal basemat of containment readings. IP-EEE external events evaluation study. Discussing horizontal and vertical acceleration and numbers of maximum design velocity.
by lillymunster 9/8/2011 5:46:32 PM

GI-199 less than 1g 25htz - this is a design basis estimate
North anna had 1.5g 25 htz
For north anna 3 they used the GI-199 standards. Now debating and confusion about what standards are being used to establish design basis and acceleration.
by lillymunster 9/8/2011 5:48:14 PM

Quoting GI-199, how curve for NA was obtained. More debating about seismic basis standards. Nobody seems to know what standards are used to compare to plant.
by lillymunster 9/8/2011 5:50:00 PM

Dominion trying to use a 2004 seismic model. Core damage frequency estimations from the 2004. They don't have new or current spectrograph siesmic standard etc. IP-EEE has not been done yet.
by lillymunster 9/8/2011 5:51:23 PM

A calculated "CAV" value for NA. 3 vendors did this. They estimated they exceeded design value horizontally in north-south direction.
by lillymunster 9/8/2011 5:53:22 PM

Duration of the strong motion of the quake. 3 values for this: 3 sec. North-South. 1.5 sec for vertical. 1 sec east-west direction
by lillymunster 9/8/2011 5:54:41 PM

NRC questioning the graphs and readings. The strong duration tells how long the harsh part of the quake was. NRC questioning that the north-south time and acceleration are different of the other directions.
by lillymunster 9/8/2011 5:56:54 PM

Looking at seismic margins. .3g is the number used. Most components can withstand .3g. They had already improved some equipment to meet this .3g level.
by lillymunster 9/8/2011 6:01:35 PM

Shut down equipment supposedly can handle more than design basis accidents per Dominion. Questions - who read the tape? A: Kinimetrics read the tape. Same person asking why nobody on site can read these tapes. Dominion engineer claiming that it was available but they could not interpret the data but Kinimetrics could turn analog to digital and interpret it.
by lillymunster 9/8/2011 6:07:58 PM

Someone again asking about why Dominion could not read their own data. That they could have known that day if they exceeded design basis right away and that sending data to vendor makes no sense.
by lillymunster 9/8/2011 6:08:45 PM

Kinimetrics says design exceeded horizontal and vertical. Other that acceleration exceeded and 3rd test also shows exceeded design.
by lillymunster 9/8/2011 6:09:29 PM

The CAV design theory applies to regular buildings not industrial building per Dominion as reason they exceeded CAV values but it isn't damaging. More questions why they are saying above OBE and yet below it.
by lillymunster 9/8/2011 6:10:38 PM

.26g is what was found for acceleration, questioner asked about this, dominion agreed this was acceleration. Wondering why talking about CAV rather than numbers against design basis and why Dominion is using these CAV standards.
by lillymunster 9/8/2011 6:12:35 PM

Comparing the readings from instruments plus a free field reading but they don't have free field seismic equipment at north Anna. They estimated the free field reading
by lillymunster 9/8/2011 6:15:00 PM

NRC structural engineering office rep talking. Correlation between soil motion and foundation motion, not all buildings are rock founded. Only containment is rock founded at NA.
by lillymunster 9/8/2011 6:16:27 PM

Based on exceeding OBE, DBE and CAV, using NRC guidelines on evaluations, flowcharts for handling such an event.
by lillymunster 9/8/2011 6:18:17 PM

Inspections after seismic event focus on critical areas for damage. Have they exceeded OBE or found damage. Said they exceeded OBE but didn't find any damage they thought was severe enough. NRC - if you exceeded OBE you need to do the inspections per NRC.

by lillymunster 9/8/2011 6:20:11 PM

Question on "no damage found" on visual only? Some testing is planned beyond visual only. Not done yet. More questions on underground pipes, tanks, sensors, inspections? No they have not completed yet.
by lillymunster 9/8/2011 6:21:17 PM

NRC says may increase inspection of underground pipes.
by lillymunster 9/8/2011 6:21:41 PM

Trip procedure, look for changes not anticipated. Wondering about the flux rate reactor change that tripped the reactor. Talking about how license renewal and aging management include seismic analysis and systems. NRC asks why did flux go down in core. Rod control or series of rod control to drop seem to be due to flux. Diverse and redundant trips coming in at once in control room

by lillymunster 9/8/2011 6:24:24 PM

transformers and flux relays didn't operate as expected.
by lillymunster 9/8/2011 6:24:47 PM

NRC asks if grid power itself had quake related problems Dominion didn't have clear answer
by lillymunster 9/8/2011 6:26:06 PM

Focus inspections on seismic event vulnerable equipment first by Dominion. No indicators found then did expanded inspections, looking at 100% of inspections. Civil walk down inspections, electrical inspections. Independent inspectors were in looking at damage.
by lillymunster 9/8/2011 6:27:47 PM

Walk down every "line" in the plant. Structural walkdown by civil engineers. Claiming they are at "damage 0"
NRC questioning EPRI guidelines and actions to take. Dominion says still considering long term actions after startup. Still in damage accessment and inspection stage.
by lillymunster 9/8/2011 6:29:49 PM

4 steps, data collection, research, asessment, analysis. In process of getting 3rd party reviews of analysis. 3 of 4 3rd parties agree with Dominion. Kennedy expert says no reason why dominion can't restart and is seismically as safe as it was before quake
by lillymunster 9/8/2011 6:31:39 PM

Sea radiation leaks reach 15,000 terabecquerels off Fukushima plant : Researchers estimate that amount of radioactive substances that leaked into the sea from the crippled Fukushima Daiichi nuclear power plant between March 21 and April 30 totaled 15,000 terabecquerels, an entity which led the research work said Thursday.
The estimate compares with 4,700 terabecquerels of radioactive iodine and cesium that the plant operator, Tokyo Electric Power Co., estimated had leaked into the sea between April 1 and 6 from a water inlet at the No. 2 reactor at the four-reactor plant following the March 11 earthquake and tsunami. mdn.mainichi.jp
by Majj 9/8/2011 6:32:53 PM

Dam also examined by Dominion. Surveillance testing, calibration of equipment and instruments, trips, functional tests, pump testing, kinds of tests they are doing beyond damage assessment. Dry cask storage pads, containment and spent fuel pool assessment. NRC asking question - more about the evaluation of the core fuel vs. inspections. What are you actually going to look at? Dominion - inspection plan to look at fuel in pool, new fuel racks, core, core detailed inspections in offload, visuals. Sampling of the fuel not all and only in one reactor, not both. Would not look at unit 1 fuel until spring 2012 next outage.

by lillymunster 9/8/2011 6:35:40 PM

General overview, visual inspections, sampling video inspections up and down rods. NRC questioning that visual only inspections. NRC saying - fuel and control rods. Confirm no distortions of rods or control rods and guides, mixing veins also a concern. NRC thinks these should also be done. NRC wants to know if mixing veins are damaged from event. NRC concerns about control rods and drive mechanism safety. Has seismic data been sent to fuel supplier for them to check their design envelope.
by lillymunster 9/8/2011 6:38:47 PM

NRC - coolant chemistry tests, temp, pressure changes in core, this information would be good. Wants pre-post quake. NRC wants core physics data due to the flux trip.
by lillymunster 9/8/2011 6:39:48 PM

Dominion - says they plan to do these in their inspections.
by lillymunster 9/8/2011 6:40:57 PM

NRR accident inspector - latent damage in reactor? Dominion - looking at weak links, vibration data, long term damage to materials. We have not finished these tests.
by lillymunster 9/8/2011 6:42:11 PM

Snubbers - how will those be evaluated? Dominion - tested a couple that had low fluid levels in past. Now some oil hanging off some snubbers. NRC again says concerned about non visual damage. NRC asks about hydraulic mechanical testing on snubbers.

by lillymunster 9/8/2011 6:43:45 PM

Spent fuel team NRC rep - boraflux used in spent fuel pool? Dominion - no, using patterning for control. NRC - evaluations of fuel storage, what kinds of inspection on racks in pool, pool liner? Dominion - some inspections so far of video on racks, comparing to 2001 video. Visual no deformation. NRC - cranes, loading and fuel handling equipment inspections? Dominino - fuel handling maybe done, cranes not
by lillymunster 9/8/2011 6:45:43 PM

NRC div. of engineering - What did you take from the KK event, how did you incorporate that into your plant in places like welds? I see nowhere you incorporated any lessons learned from international events.
by lillymunster 9/8/2011 6:46:31 PM

Dominion - We did visual, inspections of welds at unit 2. NRC - they had
hidden damage at KK and this is not being addressed.
by lillymunster 9/8/2011 6:47:04 PM

Dominion - we might pick up high risk welds. working on non safety components as indicators of other damage.
by lillymunster 9/8/2011 6:47:59 PM

Dominion - all inspections will be documented. To document everything so traceable. inspections, evaluations, repairs to be done will present this to facility safety review committee. To demonstrate our ability to restart. 1000 "pairs of eyes" at plant and engineering inspections.
by lillymunster 9/8/2011 6:49:16 PM

Dominion - going to install a free field seismic device. The time it takes to purchase and install a problem. Reinstalled the building seismic device with battery back up.
by lillymunster 9/8/2011 6:50:06 PM

Dominion engineer - inspections have not found damage that challenges safety and structures. Initial inspections are done. Rating of "0". Do more detailed inspections to cover all plant systems and structures.
by lillymunster 9/8/2011 6:51:05 PM

Inspections being done, pipe on drawing, highlight it on a document as done. Identifying all deficiencies quake or non quake related. 80% of system walk downs done. Inspections ongoing for normal electrical equipment. NRC asks about generator will coolant leak, what kind of leak? Dominon - radiator closed cooling system with a tank. Shut down, won't give a reason to NRC for shut down.

by lillymunster 9/8/2011 6:54:27 PM

97% structure inspections done. Including dams. NRC asks - how much of containment was inspected. Dominion - all accessible.
by lillymunster 9/8/2011 6:55:40 PM

Areva ready to deal with spent nuclear fuel at Fukushima plant: new CEO

TOKYO, Sept. 8, Kyodo
english.kyodonews.jp
by Edano 9/8/2011 6:56:24 PM