L-MT-12-111, Maximum Extended Load Line Limit Analysis Plus License Amendment Request - General Electric - Hitachi Presentation Materials Discussed at the NRC Audit Held October 24 - 25, 2012

Maximum Extended Load Line Limit Analysis Plus License Amendment Request - General Electric - Hitachi Presentation Materials Discussed at the NRC Audit Held October 24 - 25, 2012

ML12340A432
Person / Time
Site:	Monticello
Issue date:	11/30/2012
From:	Schimmel M Northern States Power Co, Xcel Energy
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-MT-12-111, TAC ME3145
Download: ML12340A432 (3)

Text

ENCLOSURE 1 CONTAINS PROPRIETARY INFORMATION WITHHOLD FROM PUBLIC DISCLOSURE IN ACCORDANCE WITH 10 CFR 2.390 XcelEnergy Monticello Nuclear Generating Plant 2807 W County Rd 75 Monticello, MN 55362 November 30, 2012 L-MT-12-111 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Monticello Nuclear Generating Plant Docket 50-263 Renewed License No. DPR-22

Subject:

Maximum Extended Load Line Limit Analysis Plus License Amendment Request - General Electric - Hitachi Presentation Materials Discussed at the NRC audit held October 24 - 25, 2012 (TAC ME3145)

References:

1)

Letter from T J O'Connor (NSPM), to Document Control Desk (NRC),

"License Amendment Request: Maximum Extended Load Line Limit Analysis Plus," L-MT-10-003, dated January 21, 2010. (ADAMS Accession No. ML100280558)

2)

Email from T Beltz (NRC) to J Fields (NSPM), et al, "Monticello Nuclear Generating Plant - Draft Request for Additional Information re: MELLLA+ License Amendment Review (TAC No. ME3145),"

dated October 4, 2012. (ADAMS Accession No. ML12279A224)

In Reference 1, Northern States Power Company, a Minnesota corporation (NSPM),

doing business as Xcel Energy, requested approval of an amendment to the Monticello Nuclear Generating Plant (MNGP) Renewed Operating License (OL) and Technical Specifications (TS). The proposed change would allow operation in the expanded Maximum Extended Load Line Limit Analysis Plus (MELLLA+) domain.

In Reference 2 the NRC provided a series of Requests for Additional Information (RAIs) pertaining to differences the NRC identified between TRACE and TRACG codes related to the transition to stable film boiling (the "Tmin correlation") and the quenching of the vapor film after it forms (the quenching mechanism correlation).

On October 16, 2012 the NRC held a conference call with NSPM and General Electric -

Hitachi (GEH) concerning the RAIs provided in Reference 2. During the conference call GEH described several published reports available in the public domain that addressed

Document Control Desk Page 2 many of the questions the NRC had related to these correlations. Subsequently, NSPM provided at the NRC's request, the discussed published reports.

Based on the conference call discussion, the NRC held an audit of GEH (on October 24

- 25, 2012) where further discussions were held regarding the application of these methods in the TRACG code. During the NRC audit GEH provided several presentations describing the correlations being used and the basis for their use. At the conclusion of the audit, the NRC requested that presentation materials used by GEH be provided to them. provides a proprietary copy of the presentation materials used by GEH during the audit performed by the NRC on October 24 - 25, 2012 in support of the MNGP MELLLA+ LAR. During the course of the NRC audit, GEH provided presentations to the NRC on the following topics:

o TRACG Tmin Model and Qualification o Axial Conduction Controlled Quenching o TRACG Benchmarking to Stern Flow Oscillation Tests o

Halden Dryout Fuel Behaviour Tests, and o

Monticello MELLLA+ ATWSI Analysis provides a non-proprietary copy of the Enclosure 1 presentation materials.

The non-proprietary copy of the presentation materials is being provided based on the NRC's expectation that the submitter of the proprietary information should provide, if possible, a non-proprietary version of the document with brackets showing where the proprietary information has been deleted. contains an affidavit executed to support withholding Enclosure 1 from public disclosure. Information in Enclosure 1 contains proprietary information as defined by 10 CFR 2.390. The affidavit sets forth the basis on which the information may be withheld from public disclosure by the NRC and addresses with specificity the considerations listed in 10 CFR 2.390(b)(4). Accordingly, NSPM respectfully requests that the proprietary information in Enclosure 1 be withheld from public disclosure in accordance with 10 CFR 2.390(a)4, as authorized by 10 CFR 9.17(a)4.

Correspondence with respect to the copyright or proprietary aspects of GEH information or the supporting GEH affidavit in Enclosure 3 should be addressed to Edward D.

Schrull, Vice President, Regulatory Affairs, GE Hitachi Nuclear Energy, 3901 Castle Hayne Road, Wilmington, NC 28401.

This letter makes no new commitments and no revisions to existing commitments.

Document Control Desk Page 3 I declare under penalty of perjury that the foregoing is true and correct.

Executed on: November3o, 2012 Mark A. Schimmel Site Vice-President Monticello Nuclear Generating Plant Northern States Power Company-Minnesota Enclosures (3) cc:

Regional Administrator, Region Ill, USNRC (w/o enclosures)

Project Manager, Monticello Nuclear Generating Plant, USNRC Resident Inspector, Monticello Nuclear Generating Plant, USNRC (w/o enclosures)

Minnesota Department of Commerce (w/o enclosures)