8/2/2019 Diablo Canyon Q-As With Edits - Pages From C142449-02E-4

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Bensi, Michelle /From:Sent:To:Subject:Attachments:

Bensi, Michelle .Friday, March 25, 2011 2:22 PMKammerer, AnnieDiablo Q&As.Diablo Canyon QAsMBedit_3-25.docx

Annie,I have attached the Diablo Canyon Q&As with edits. You will see that I have replaced big chunks of words inthe Diablo doc with the exact text used in the public FAQs (based on the revisions we made yesterday). Ithought it would be good to have the wording be consistent between the documents.With regard to the SONGS doc:. Some of the questions are common between the SONGS and Diablodocuments. I will not edit the common questions until Iget back your revisions on the Diablo questions (so thatthe answers will use the same wording).I am working on the public FAQs now.Shelby

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8/2/2019 Diablo Canyon Q-As With Edits - Pages From C142449-02E-4

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1.What does the Japanese Earthquake Mean to Diablo Canyon?

1) Could an earthquake and tsunami the size of the one in Japan happen at Diablo Canyon?.Thisarhguake A-occurred onn subduct on;zo-n",which Isthe type of teztonc regienhat praduccehearogceset magnteitudeseadthoquaeo ontectonic plate b oundaryhereeenelates pushednde rnEther planth pubaetie.eoneretsFunames are th5e required texpred in thJ indf ffectin teuonai seen in t easthcdintetbdl US, the anly cubduetien ene is the asEadfO '1Wabduction,zond the~ :offrthernost ortnf farfortiher Caoifnuently, andoninenta Scuntminntas lrgeasthqke ond teuperien:cla,d an J apanould only happen thC re!

Ih dTohoku earthijuake occurred on asubduiciion zone, wich~sphe~vof~tctonIc region h~aiDaroduces earthquakes of the largest magnitude. A ubductionzne isa tectonic plate boundary heone tectonic plate isoushed under another'plate. Se v1ereIts unamis like the one experienced inJapan'are only produced by earthquakes occurring at this typIe of Plate boundary. The only subduction zoneaffecting the continental US is he Cascadia subduction zone, which lies off the coasts of Oregon1Washington. and the northernmost portion of California. Consequently, acontinental earthquake an d'tsunami as large as the one experienced inJapan could only happen in hat coastal region, L -Diablo Canyon Nuclear Power Plant is ocated outside of the Cascadia subduction zone. QO,#ide-ef-thpCaseadia subdue#9ien zen, eEarthquakes occurring outside of the Cascadia subduction zone are notexpected to exceed a magnitude of approximately 8. 2 5_.a;d that would er+, lEarthquakes of thi.magnitude would only occur on the largest fault lines, Such as the San Andreas fault, which is 50 miles . -away from Diablo Canyon Nuclear Power Plant. Furthermore, the Sa n Andreas is an onshore fault andthus not capable of producing a tsunami.2) What magnitude earthquake are currently operating US nuclear plants such as Diablo

Canyon designed to?

comment [MB1]: Changed wording to beconsistent with the public FAQcdocument.

- Comment [1B2]: Can you make this statementa little "stronger' by saying the only fault that iscapable of producing such large EQs and that islocated near DCNPP is he SanAndreas? If not, thenthis answer is incomplete and you would really needto list other large faults. ".

Structural damage is caused by the igtegsiWstrenpah of qroundmotion experienced during an .. Formatted: Font: Italic __earthquake. Ground motion intensity is a function of the magnitude of an earthquake, the distancefrom the fault to the site, and other geologic characteristics. Nuclear plants, and in fact all engineered - .structures, are designed based on ground motion-i nt@siWeYe4. not earthquake magnitudes. Each-eacE-eF-nuclear power plant in the United States is designed for a rd-e.eground motion intensity that 'Momn'ent[n3]: Thisisn't 'perfectV' accurateis determined on a site-specific basis. Graund rau iEn aa .unetiep Of bath the magnitde of an sam e actualanal numbesmaybe t... .earthquake and the dictan;e fress the fault te the site; and i cgreund metien that eauaeu damage. Sn,Nuclear plants, and in. at all engineered Structurec, a.e actu"ally designed based en fGrund m.etien. ' leyel:, net earthquake magnitudes,~ 's ,