NG-16-0130, Six-Month Status Report in Response to 06/06/2013 Commission Order Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation Under Severe Accident Conditions (Order Number EA-13-109)

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Six-Month Status Report in Response to 06/06/2013 Commission Order Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation Under Severe Accident Conditions (Order Number EA-13-109)
ML16187A265
Person / Time
Site: Duane Arnold NextEra Energy icon.png
Issue date: 06/30/2016
From: Vehec T
NextEra Energy Duane Arnold
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
EA-13-109, NG-16-0130
Download: ML16187A265 (11)
v • d • e


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  • 'N~xtEra'ltrletg\i buane*'Arnold, LLC's Six-Month Status Report in--Response td.JUiie:6.

'.201:, :Commission :order Modifying ticenses with Regard to :Reliable* Hardened*

.contaih'mentVerits CarJ'able,:ot 0p-eration Unoer*Sevete:Acciderit:GO'n'ditioris (Order

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order EA-:13.-1.09, OrderModifyliig Lic:e:Jh'sfa.witti Regatd to

-.Reliable.Hardened tontainmenfVents* Capable of Operation Under

.sevefre Abcideiit.Cofiditiehs;*" :aated June.6; *20.13 (ML1 :naoAd67) *

2.: NextEra Energy DlianeArribld.LLC's Phase 1 overall lnteigrated *.

Plan.in Response to June 6>20:13 Commission Order Moc:lifying

  • Licenses With Regah:i to .Reliable Hardeffed Chnfafrfrneht Vents*
  • Capabl~ of Operation Under severe Acddent-Gohditidhs* (Ol'der*

Numb'Efr£A-t3-109. dated December 10, 20.1:4 (IVJL14349A324}

NextEra EriergY Duane Arriold; LliG'.s Six,.,Morith Status: Repd'rt ant!

Phase *~ .and .-2.*0verall lritegrated Plan in.Response.to June:f'.6, 201<3 comh'iissior1 Order Modifying.Licenses with Regard to>Reliable.

Hardem~d C.on'faln111entVe*nts*:.8apable of:Operation *onder'S:e\1e*r.e

AcCidenfCcinditions ~Order Numher.EA'"f:3.:1 o:9) .dated December)
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::ra Energy t.>.uqne Arno-Id, LLC': Reference *f was*

frnmediat~ly effect'ive *and:*.tjJrects*Ne~tEfa'. En,efgy Dpan<fArhgl(J, LLQ: (lier6:ciftef Ne~Er1:1 Energy o*uanei\rnold):lo Jnstali:a rdibtble hardenea*ventfng cap<<:lBlfity for' pre.,

cRr.~:*g~tf\age<?'Q<:1 . Lfrft;fsY"s~V.¢re ac*¢.iq¢nt con:(Jiti.o0~. incllJ9ing tno§e/inVolying* a ,b.re,ach.

of the reactor vessel* by rndlten '.core debris; Sp.ecif!c requirement~ ~re .outlin~d in Attf:tcht:n:enr2 of R,ef~_renq_e*~*L .. . . .

Ref~f.~hg~ 1 :f¢ctL1ir~d.*l?iJ.biTJi$$iQM gf.@ fihas.e 1 Overall Integrated Plan* '(OLP) pursuant.

.td Section lv, condition D, and st$t~1s tep()rts at siX.-mt>n~~ interv~!,$ ther\~atter~ Ne>.ctEra l!-153 Ne~tEra Ener,gy Duane Amold, LLC, .3277'DAEC Road,_Palo, IA.52324 IJflfL

Document Control Desk NG-16-0130 Page 2of2 NextEra Energy Duane Arnold submitted the Phase 1 OIP by letter dated December 10, 2014 (Reference 2). Reference 3 included the required six-month status update, as well as the Phase 2 OIP submittal. The consolidated Phase 1 and 2 OIP document provided a list of the Phase 1 OIP open items, and addressed ttie NRC Interim Staff Evaluation open items for Phase 1. This letter is being submitted to satisfy the requirements for providing the six-month updates for Phase 1 and 2 of the Order in accordance with Section IV, Condition D.3, of Reference 1.

This letter contains no new regulatory commitments. If you have any questions regarding this submittal, please contact Tim Holt at 319-851-7345.

I declare under penalty of perjury that the foregoing is true and correct.

Exec ed on June 30, 2016.

. . Vehec Vice President, Duane Arnold Energy Center NextEra Energy Duane Arnold, LLC Enclosure cc: Director, Office of Nuclear Reactor Regulation USNRC Regional Administrator Region Ill USNRC Project Manager, Duane ArnQld Energy Center USNRC Resident lnspectorj Duane Arnold Energy Center

  • Enclosure to NG-16-0130 NextEra Energy Duane Arnold, LLC's Six~Month Status Report in Response to June 6, 2013 Commission Order Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation Under Severe Accident Conditions (Order Number EA-13-109) 8 pages follow

Enclosure to NG-16-0130 - NextEra Energy Duane Arnold, LLC's Six Month Status Report for the Implementation of Order EA-13-109,0rder Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation under Severe Accident Conditions 1 Introduction NextEra Duane Arnold Energy Center, LLC developed an Overall Integrated Plan (Reference 1 in Section 8), documenting the planned installation of a Hardened Containment Vent System (HCVS) that provides a reliable hardened venting capability for pre-core damage and under severe accident conditions, including those involving a breach of the reactor vessel by molten core debris, in response to Reference 2. Starting with this six month status report, updates of milestone accomplishments will be based on the combined Phase 1 and 2 Overall Integrated Plan dated December 22, 2015.

NextEra Duane Arnold Energy Center, LLC developed an updated and combined Phase 1 and 2 Overall Integrated Plan (Reference 7), documenting:

1. The planned installation of a Hardened Containment Vent System (HCVS) that provides a reliable hardened venting capability for pre-core damage and under severe accident conditions, including those involving a breach of the reactor vessel by molten core debris, in response to Reference 2.
2. An alternative venting strategy that makes it unlikely that a drywall vent is needed to protect the containment from overpressure related failure under severe accident conditions, including those that involve a breach of the reactor vessel by molten core debris, in response to Reference 2.

This enclosure provides an update of milestone accomplishments since submittal of the combined Phase 1 and 2 Overall Integrated Plan. including any changes to the compliance method, schedule, or need for relief/relaxation and the basis, if any.

2 Milestone Accomplishments The following milestone(s) have been completed since the development of the combined Phase 1 and 2 Overall Integrated Plan (Reference 7), and are current as of June 1, 2016.

  • Design Complete Phase 1
  • Submit 6 Month Status Report (Complete with this submittal) 3 Milestone Schedule Status The following provides an update to Part 5 of the combined Phase 1 and 2 Overall Integrated Plan. It provides the activity status of each item, and whether the expected completion date has changed. The dates are planning dates subject to change as design and implementation details are developed.

Page 1of8

EnCJo~~re fcH*!G-1'6.:0130"' N~xtEr~ Erj:~XQY pu~n~ Afn9ld, LLC!s.Six Moh,th Stefitus* Report for the lri1plerhentatiO-n of Order EA-13-109;Grder Modifying L.icenses with Regard tO Reliable Hardene'd

. Coritciinrneht Vents Capable df Gperatiori under' Severe AcCiderit Conditions Phase 1 Mflesfone Sched.ule:

June 2014 *Co_n'Jplel$

SLibrhifbverall Integrated Implementation Plan .June '2014 .Complete fnitial Qi.ttag.e forPhase 1 Plannin~J. Nov. 2014 Complete

,.................Montlf:status submif6 , . . . . . . .... . . . . .Re* ort.

. P...

D$c.~ 2015 Complet?

Mar. 2016 *Complete Submit6 Month Stafus'Repoff June 2016 .Complete W,ith thi~

sub.mittcil Qc.t,*2016 *started*

Site $pe:cifiq Mc;lint~nqnc~ and Testing OcJ,.2016 :start$d.

ProceduresDeveloped *

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Ehblosure:to NG.,16-0130 :- NextEra EhergyDuaiie Arnold, LLC's.Six Month Status Report for the lmplemehtaliori.6f Order EA..:1~-109,0rder,MbC.lifying Licer1ses with Regard lei' ReiiableHarderred C6ntainiilemt Vents Capable of Operation under:Severe Accident Conditions Phase* 2 Milestone Schedule C'~-~,->~i~t:i!~\~1~--~ ,.

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started Submit 6 Month*Status Report Complete with this sl1bn11tt~1 SLibmifX1 Month;Status Report De.c. 2016. Not

  • Started.

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Enclosure to NG-16-0130 - NextEra Energy Duane Arnold, Ltc*s Six Month Status Report for the Implementation of Order EA-13-109,0rder Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation under Severe Accident Conditions

4. Changes to Compliance Method There are no changes to the compliance method as documented in the combined Phase 1 and 2 Overall Integrated Plan (Reference 7). However, changes have been made to the design details which affect descriptions contained in Reference 7.
  • The HCVS "Nitrogen Supply Isolation at 1A3 ROS" (V43-0642) will be normally closed and locked to prevent inadvertent vent operation. This valve will have to be manually opened at the Remote Operating Station (ROS) in the 1A3 Essential Switchgear Room to supply nitrogen for CV operation and purging.
  • The .Uninterruptible Power Supply (UPS) originally had the normal power supply from 1832. Analysis identified that 1832 did not have adequate margin to add this load; therefore the normal power supply has been changed to 1815. A receptacle will be installed at the UPS for direct connection to the portable 480 VAC generator.

The power to 1815 will be lost during an ELAP. The UPS will provide power for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; the FLEX 480 VAC generator will provide power beyond 24 hrs.

5 Ne'ed for Relief/Relaxation and Basis for the Relief/Relaxation NextEra Duane Arnold Energy Center. LLC expects to comply with the order implementation date and no relief/relaxation is required at this time.

6 Open Items from Combined Phase 1 and 2 Overall Integrated Plan and Interim Staff Evaluations The following tables provide a summary of the open items documented in the combined Phase 1 and 2 Overall Integrated Plan or the Interim Staff Evaluation (ISE) and the status of each item.

Combined Phase 1 and 2 OIP Open Item Status Phase *1 Open Items

1. Confirm secondary .containment bypass leakage is Completed. Appropriate rupture acceptable without an installed rupture disk or retain disk is included in design of an appropriate disk. modification.
2. Perform severe accident evaluation for FLEX DG and Started replacement gas to confirm accessibility for use for oost 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> actions.
3. Evaluate tornado/missile effects on HCVS components Complete above the protected area of the Reactor Buildina.
4. Evaluate the system design for H2/CO measures to be Complete taken.

Page4of8

Enclosure to NG-16-0130

  • NextEra Energy Duane Arnold, LLC's Six Month Status Report for the Implementation of Order EA-13-109,0rder Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation under Severe Accident Conditions Interim Staff Evaluation Open Items Status Phase 1 ISE Items

. a e ava1 a e or s a au 1 ana yses Started demonstrating that HCVS has the capacity to vent the steam/energy equivalent of one (1) percent of licensed/rated thermal power (unless a lower value is .justified), and that the suppression pool and the HCVS together are able to absorb and reject decay heat such that following a reactor sliutdown from fuh power containment pressure is restored and then maintained below the primary containment design pressure and the Rrimary containment P-ressure limit. (Section 3.2.2.1, Section 3.2.2.2)

Started a e ava1 a e or s a au 1 a 11ona e a1 Eliminated.

on the design features that minimize unintended cross flow of vented fluids within a unit, including a The design has been modified one line diagram containing sufficient detail to since issuance of the ISE. The confirm the Clescription in tfie OIP. (Section 3.2.2.7) HCVS vent path is a dedicated path, eliminating the possibility of unintended cross flow.

Started

. rov1 e a escnp ion o e stra eg1es or y rogen Started control that minimizes the potential for hydrogen gas migration and ingress Into the reactor building or other buildings. (Section 3.2.2.6)

Started Started Page 5 of8

Enclo~ure to NG-16-0130

  • NextEra Energy Duane Arnold, LLC's Six Month Status Report for the Implementation of Order EA-13-109,0rder Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation under Severe Accident Conditions Started Started
  • a e ava1 a e or s a au 1 ocumen a ion of an evaluation verifying the existing containment isolation valves, relieCJ upon for the ACVS, will As stated in NG-15-0169, Six open under the maximum expected differential Month Status Update, due to pressure during BDBEE and severe accident design changes in vent wetwell venting. (Section 3.2.2.9) location and routin_g, existing containment isolation valves will no longer be used for venting. New vent design will utilize a spare torus penetration with two new primary containment isolation valves and a rupture disk.

An evaluation will be done to ensure the two new containment isolation valves .

wlll open under the maximum expected differential pressure during BDBEE and severe accident wet well ventin .

Started

. a e ava1 a e or s a au e Started descriptions of local conditions (temperaturet radiation and humidi~) anticipated during ELAP and severe accident for the components -cvalvest instrumentation, sensors, transmitters, indicators, electronics~ control devices, and etc.) required for HCVS ventmg including confirmation that the

  • com~onents are caQabre of performing. their functions during El.AP and severe accident conditions. (Section 3.2.2.3, Section 3.2.2.5, Section 3.2.2.9, Section 3.2.2.10)

Page6of8

Enclosure to .NG-16-0130 - NextEra Energy Duane Arnold, LLC's Six Month Status Report for the Implementation ~f Order EA-13-109,0rder Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation under Severe Accident Conditions 4.. rovr e a JU~ti cat19n .or ev1atmg rom e 1mmate .

rnstr1:Jme11tatron se1sm1c qualificatron guidance As stated in NG-15-0169, Six specified 1n NEI 13-02, endorsed, In part by Month Status Update, the JLD-ISG-2013-02 as an acceptable mean's for qualification method used for implementing apP.licable reguirements of Order each HCVS instrument will be EA-13-109. (Section 3.2.2.9) to the IEEE 344-2004 standard or a substantially similar industrial standard and*

therefore will not be deviating from NEI 13-02 or JLD-ISG-2013-02. .

Phase 2 Interim Staff Evaluation Open Item Status TBD N/A 7 Interim Staff Evaluation Impacts The June 2015-six-month update (Reference 6) noted the following two potential impacts to the Interim Staff Evaluation:

1) One ISE Open Item will be eliminated because the Hardened Pipe Vent will no longer use existing containment isolation valves. The revised vent pipe routing will instead use an existing spare torus penetration and install two new containment isolation valves and a rupture disk. An evaluation will be done to ensure the two new containment isolation valves will open under the maximum expected differential pressure during BDBEE and severe accident wetwell venting.
2) The Interim Staff Evaluation (ISE) inadvertently listed a vent pipe process pressure Indicator which will not be part of the Duane Arnold design.

In addition. as discussed previously in Section 4:

The HCVS "Nitrogen Supply Isolation at 1A3 ROS" (V43-0642) will be normally closed and locked to prevent inadvertent vent operation. This valve will have to be manually opened at the Remote Operating Station (ROS) in the 1A3 Essential Switchgear Room to supply nitrogen for CV operation and purging.

The Uninterruptible Power Supply {UPS) originally had the normal power supply from 1832. Analysis identified that 1832 did not have adequate margin to add this load; therefore the normal power supply has been changed to 1815. A receptacle will be installed at the UPS for direct connection to the portable 480 VAC generator.

The power to 1B15 will be lost during an ELAP. The UPS will provide power for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; the FLEX 480 VAC generator will provide power beyond 24 hrs.

Page7of.8

Enclosure to .NG-16-0130

  • NextEra Energy Duane Arnold, LLC's Six Month Status Report for the Implementation ?f Order EA-13-109,0rd~r Modifying licenses with Regard to Reliable Hardened Containment Vents Capable of Operation under Severe Accident Conditions 8 References The following references support the updates to the combined Phase 1 and 2 Overall Integrated Plan described in this Enclosure.
1. NextEra Duane Arnold Energy Center, LLC Phase 1 Overall Integrated Plan in _

Response to June 6, 2013 Commission Order Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation Under Severe Accident Conditions (Order Number EA-13-109)," dated December 10, 2014.

2. NRC Order Number EA-13-109, "Order Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation Under Severe Accident Conditions" dated June 6, 2013.
3. NEI 13-02, "Industry Guidance for Compliance with NRC Order EA-13-109, 'To Modify Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation Under Severe Accident Conditions," Revision 1, dated April 2015.
4. NRC Interim Staff Guidance JLD-ISG-2013-02, "Compliance with Order EA 109, Order Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation Under Severe Accident Conditions," Revision Qt dated November 2013 (Accession No. ML133048836). * *
5. NRC Endorsement of Industry "Hardened Containment Venting System (HCVS)

Phase 1 Overall Integrated Plan Template (EA-13-109) Rev O" {Accession No. ML14128A219).

6. NextEra Energy Duane Arnold, LLC's Six-Month Status Report in Response to June 6, 2013 Commission Order Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation Under Severe Accident Conditions (Order Number EA-13-109), dated June 18, 2015(ML15170A333)
7. NextEra Duane Arnold Energy Center, LLC Combined Phase 1 and 2 Overall Integrated Plan in Response to June 6, 2013 Commission Order Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation Under Severe Accident Conditions (Order Number EA-13-109), dated December 22~ 2015.
8. NRC Interim Staff Guidance JLD-ISG-2015-01, "Compliance with Phase 2 of
  • Order EA-13-109, Order Modifying Licenses with Regard to Reliable Hardened Containment Vents Capable of Operation Under Severe Accident Conditions,"

Revision 0, dated April 2015 (Accession No. ML15104A118).

Pages of 8

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