ML11279A024

2011/10/04 NRR E-mail Capture - ME5744 - DAEC Adoption of TSTF-425 - Request for Additional Information (RAI) as Amended

ML11279A024
Person / Time
Site:	Duane Arnold
Issue date:	10/04/2011
From:	Feintuch K Division of Operating Reactor Licensing
To:	Browning T NextEra Energy Duane Arnold
References
TAC ME5744, TSTF-425
Download: ML11279A024 (3)

Text

1NRR-PMDAPEm ResourceFrom:Feintuch, KarlSent:Tuesday, October 04, 2011 10:56 AMTo:'Browning, Tony'Cc:ONeal, Daniel; Harrison, Donnie

Subject:

RE: ME5744 - DAEC adoption of TSTF-425 - Request for Additional Information (RAI) as amended.Background to this RAI On September 29, 2011, the NRC staff issued a request for additional information with two items. On October 3, 2011, the NRC enquired about an apparent typo, which was confirmed on October 4, 2011 by email exchange. The September 29, 2011 RAI has be amended to include a third item, to address the typo. The amended RAI that follows replaces in its entirety the September 29, 2011 RAI. RAI, as amended By letter dated February 24, 2011, NexEraEnergy Duane Arnold, LLC, requested an amendment to the Duane Arnold Energy Cener Renewed Facility Operating License to adopt TSTF-425, by which a risk-informed relocation to a licensee controlled program would be applied to Technical Specification surveillance frequency requirements.

On June 10, 2011 the NRC sought further information, which you provided in an August 15, 2011 supplement.

A clarification conference call took place on September 15, 2011, to discuss those responses in your August 15, 2011 supplement. At that time you were informed that the NRC would assess what further information might be required.

There are three follow-up questions, the responses to which are needed in addition to your supplement of August 15, 2011: 1. Expand the discussion on your sensitivity analysis for the loss-of-bus initiators 1A1, 1A2, 1A3, and1A4 in response to Question number 5 (referring to the text of your supplement dated August 15, 2011) , including important assumptions, what was varied in the sensitivity analysis, and the insights gained related to the importance of these buses as initiators for TSTF-425 application. Discuss how these initiators, as well as the other initiators discussed in the gap description for IE-B3-01A, will be addressed for TSTF-425 application. 2. Expand upon your response to Question number 9 e (referring to the text of your supplement dated August 15, 2011) . Discuss the scope of the focused peer review against the ASME/ANS Standard RA-Sa-2009 Supporting Requirements (SRs) for the new PRA methods. For example, did the review scope focus on only open gap items or did it address SRs for the entire element associated with the new PRA method? 3. For the Duane Arnold TSTF-425 acceptance review, the NRC Staff also seeks a clarification of an apparent typo observed in your (DAEC) answer within your August 15, 2011 supplement. Question No. 2 was related to Supporting Requirement "SC-A6." However, your response cited only reference to "IE-A4a." Please confirm that a typo occurred and provide replacement text as part of your response to this RAI We are available for a clarifying conference call. For planning purposes please respond on or about November 1, 2011. Please confirm your planned date of response.

2 Karl Feintuch USNRC 301-415-3079 Hearing Identifier: NRR_PMDA Email Number: 167 Mail Envelope Properties (26E42474DB238C408C94990815A02F0968B56B5958)

Subject:

RE: ME5744 - DAEC adoption of TSTF-425 - Request for Additional Information (RAI) as amended. Sent Date: 10/4/2011 10:56:29 AM Received Date: 10/4/2011 10:56:00 AM From: Feintuch, Karl Created By: Karl.Feintuch@nrc.gov Recipients: "ONeal, Daniel" <Daniel.ONeal@nrc.gov> Tracking Status: None "Harrison, Donnie" <Donnie.Harrison@nrc.gov> Tracking Status: None "'Browning, Tony'" <Tony.Browning@fpl.com>

Tracking Status: None Post Office: HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 2870 10/4/2011 10:56:00 AM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received: