ML13330B715

RAI from the Mechanical & Civil Engineering Branch Re. Revise STP Submittal and Request for Exemptions and License Amendment for a Risk-information Approach to Resolving Generic Safety Issues (GSI)-191

ML13330B715
Person / Time
Site:	South Texas
Issue date:	11/26/2013
From:	Matt Bartlett Plant Licensing Branch IV
To:	Harrison A South Texas
Singal B
References
GSI-191, TAC MF0613, TAC MF0614
Download: ML13330B715 (2)

Text

From: Bartlett, Matthew Sent: Tuesday, November 26, 2013 10:54 AM To: awharrison@stpegs.com Cc: Sebrosky, Joseph

Subject:

RAI from the Mechanical & Civil Engineering Branch Mr. Harrison, The U.S. Nuclear Regulatory Commission (NRC) staff's Chief, Mechanical & Civil Engineering Branch (EMCB) has reviewed your application dated June 19, 2013 (Agencywide Documents Access and Management System (ADAMS), Accession No. ML13175A211) and supplements dated October 3, 2013 (ADAMS Accession No. ML13295A222) and October 31, 2013 (ADAMS Accession No. ML13323A673). Attached below is an RAI regarding your license amendment request for the GSI-191. Please provide your response to the attached RAI by January 17, 2014 in order to support the review schedule.

Thanks.

Sincerely, Matt Bartlett NRRIDORULPLIV (Rotation)

(301) 415-1577 REQUEST FOR ADDITIONAL INFORMATION (RAI)

REGARDING LICENSE AMENDMENT FOR RISK-INFORMED APPROACH TO RESOLVING GENERIC SAFETY ISSUE (GSI) 191 SOUTH TEXAS NUCLEAR OPERATING COMPANY (STPNOC)

SOUTH TEXAS PROJECT (STP), UNITS 1 AND 2 DOCKET NOS. 50-498 AND 50-499 (TAC NOs MF2400 and MF2401)

References:

1. Enclosure to Letter From William H. Ruland, Director, Division of Safety Systems, Office of Nuclear Reactor Regulation, U.S. Nuclear Regulatory Commission, to Anthony Pietrangelo, Vice President, Regulatory Affairs, Nuclear Energy Institute, "Revised Content Guide for Generic Letter 2004-02 Supplemental Responses." November 21, 2007. (ADAMS Accession No. ML073110389)

2. Letter No. NOC-AE-08002372, From David W. Rencurrel, Site Vice President, South Texas Nuclear Operating Company, to U.S. Nuclear Regulatory Commission, Document Control Desk, "Supplement 4 to the Response to Generic Letter 2004-02," December 11, 2008. (Accession No. ML083520326)

3. Letter No. NOC-AE-13002986, From D. W. Rencurrel, Senior Vice President, Operations, South Texas Nuclear Operating Company, to U.S. Nuclear Regulatory Commission, Document Control Desk, "Revised STP Pilot Submittal and Requests for Exemptions and License Amendment for a Risk-Informed Approach to Resolving Generic Safety Issue (GSI)-191 ,"June 19, 2013. (Accession No. ML13175A211)

4. Letter No. NOC-AE-13003043, From G. T. Powell, Site Vice President, South Texas Nuclear Operating Company, to U.S. Nuclear Regulatory Commission, Document Control Desk, "Supplement 1 to 1

Revised STP Pilot Submittal and Requests for Exemptions and License Amendment for a Risk-Informed Approach to Resolving Generic Safety Issue (GSI)-191 ," November 13, 2013.

(Accession No. ML13323A183)

Mechanical and Civil Engineering Branch (EMCB)

STP-GSI-191-EMCB-RAI-1 Item 3.k of Reference 1 requested licensees to summarize the structural qualification results and design margins for various components of the sump strainer structural assembly. In Reference 2, STPNOC, the licensee, provided a qualitative response regarding the structural analysis without any supporting quantitative data. Additional information is needed regarding actual and allowable stresses and design margins for the various components of the sump strainer structural assembly to clarify the inherent level of conservatism employed in the design. This information was not STPNOC submittals (References 3 and 4).

Please summarize the structural qualification results, including the actual and allowable stresses, and design margins for the various components of the sump strainer structural assembly.

2