Text

ACRS Review of Applications for Operation in the Expanded Power to Flow Domain
	ML19107A233
Person / Time
Issue date:	04/17/2019
From:	Riccardella P; Advisory Committee on Reactor Safeguards
To:	Margaret Doane; NRC/EDO
	Wang, W, ACRS
References
	Download: ML19107A233 (4)
	v • d • e

UNITED STATES NUCLEAR REGULATORY COMMISSION ADVISORY COMMITTEE ON REACTOR SAFEGUARDS WASHINGTON, DC 20555 - 0001 April 17, 2019 Ms. Margaret M. Doane Executive Director for Operations U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

SUBJECT:

ACRS REVIEW OF APPLICATIONS FOR OPERATION IN THE EXPANDED POWER TO FLOW DOMAIN

Dear Ms. Doane:

During the 662nd meeting of the Advisory Committee on Reactor Safeguards, April 4-5, 2019, we evaluated our involvement in reviews of the License Amendment Request (LAR) in the expanded power to flow domain, such as the Maximum Extended Load Limit Analysis Plus (MELLLA+) operating domain. Our discussion was informed by materials presented at the March 19, 2019, meeting of the ACRS Power Uprates Subcommittee in which representatives from the staff and their consultants reported their progress on a review of the license amendment request (LAR) by Tennessee Valley Authority (TVA) for Units 1, 2, and 3 of the Browns Ferry Power Plant (Browns Ferry) and on other activities affecting operation in the expanded power to flow domain. Representatives from TVA also provided input regarding their Browns Ferry LAR during this Subcommittee meeting.

The staff has established a mature process for completing reviews on this topic and applied this process to a range of BWR designs. In more complex cases, such as ones in which a licensee combines methods developed by multiple vendors, the staff completes TRACE confirmatory calculations to increase confidence that appropriate uncertainties are considered by the licensee.

Hence, we conclude:

No additional ACRS review of the TVA MELLLA+ LAR for Browns Ferry is required unless there are substantive changes in the status that the staff provided on March 19, 2019.

ACRS participation in future reviews of this topic is not required unless a new LAR involves substantive differences from the plant designs and conditions that have been approved.

We request that the staff continue to inform us of future activities relevant to this topic that might impact the above conclusions.

Sincerely,

/RA/

Peter C. Riccardella Chairman REFERENCES

1. Tennessee Valley Authority, Proposed Technical Specifications (TS) Change TS510 -

Request for License Amendments - Maximum Extended Load Line Limit Analysis Plus, February 23, 2018 (ADAMS Accession No. ML ML18079B140 and ML18086A088 (proprietary)).

2. Tennessee Valley Authority, Proposed Technical Specifications (TS) Change TS510 -