ML13123A085

Relief Request No. I5R-02 - Request for Additional Information

ML13123A085
Person / Time
Site:	Dresden
Issue date:	05/02/2013
From:	Purnell B A Plant Licensing Branch III
To:	Mathews M Exelon Corp
References
TAC ME9684, TAC ME9685
Download: ML13123A085 (2)

Text

1 NRR-PMDAPEm Resource From:Purnell, Blake Sent: Thursday, May 02, 2013 2:54 PM To: Mitchel.Mathews@exeloncorp.com Cc: ken.nicely@exeloncorp.com; Bowen, Jeremy; Mozafari, Brenda

Subject:

Dresden Relief Request No. I5R Request for Additional InformationOFFICE OF NUCLEAR REACTOR REGULATION REQUEST FOR ADDITIONAL INFORMATION DRESDEN NUCLEAR POWER STATION, UNITS 2 AND 3 EXELON GENERATION COMPANY, LLC RELIEF REQUEST NO. I5R-02 DOCKET NUMBERS 50-237 AND 50-249 TAC NOS. ME9684 AND ME9685

By letter to the U.S. Nuclear Regulatory Commission (NRC) dated September 28, 2012 (Agencywide Documents Access and management System (ADAMS) Accession No. ML12275A069), as supplemented by letter dated November 28, 2012 (ADAMS Accession No. ML12333A263), Exelon Generation Company, LLC (the licensee) submitted several proposed relief requests for the Dresden Nuclear Power Station, Units 2 and

3. The NRC staff determined that the following additional information is necessary to complete the review of relief request I5R-02. This request for additional information (RAI) is in addition to the RAI sent to you on April 9, 2013, and the associated RAI numbering is continued. To support the schedule for approval the response to this request is expected by June 3, 2013.

Based on the NRC staff's review of Relief Request I5R-02:

4. The description and disposition of the gap identified in Attachment 1 of relief request I5R-02 for supporting requirement DA-C12 does not address the requirements in the American Society of Mechanical Engineers (ASME)/American Nuclear Society (ANS) RA-Sa-2009, "Addenda to ASME/ANS RA-S-2008: Standard for Level 1/Large Early Release Frequency Probabilistic Risk Assessment for Nuclear Power Plant Applications." Provide verification that a review was conducted that shows support system dependencies are properly captured as required by the standard. In addition, specify whether peer-review or self-assessment results i ndicate whether this supporting requirement is categorized as capability Category I or not-met. If categorized as "not-met", provide the disposition that ascertains the supporting requirement is now capability Category I.

A copy of this email will be placed into ADAMS and made publicly available.

Sincerely,

Blake Purnell, Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission

ph: 301-415-1380

Hearing Identifier: NRR_PMDA Email Number: 681 Mail Envelope Properties (Blake.Purnell@nrc.gov20130502145300)

Subject:

Dresden Relief Request No. I5R Request for Additional Information Sent Date: 5/2/2013 2:53:55 PM Received Date: 5/2/2013 2:53:00 PM From: Purnell, Blake Created By: Blake.Purnell@nrc.gov Recipients: "ken.nicely@exeloncorp.com" <ken.nicely@exeloncorp.com> Tracking Status: None "Bowen, Jeremy" <Jeremy.Bowen@nrc.gov>

Tracking Status: None "Mozafari, Brenda" <Brenda.Mozafari@nrc.gov> Tracking Status: None "Mitchel.Mathews@exeloncorp.com" <Mitchel.Mathews@exeloncorp.com> Tracking Status: None Post Office: Files Size Date & Time MESSAGE 2287 5/2/2013 2:53:00 PM

Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received: