ML101450294

Request for Additional Information License Amendment Request for Technical Specification Changes and Analyses Regarding Use of Alternate Source

ML101450294
Person / Time
Site:	Arkansas Nuclear
Issue date:	05/25/2010
From:	Kalyanam N Plant Licensing Branch IV
To:	Clark R Entergy Operations
Kalyanam N, NRR/DORL/LP4, 415-1480
References
TAC ME3678
Download: ML101450294 (1)

Text

From: Kalyanam, Kaly Sent: Tuesday, May 25, 2010 10:22 AM To: CLARK, ROBERT W

Subject:

Request for Additional Information on the AST LAR - ME3678

Bob, By letter dated March 31, 2010, Entergy Operations, Inc. (the licensee), submitted a request for license amendment to implement an alternative source term (AST) for Arkansas Nuclear One, Unit 2 (ANO-2).

The staff, has reviewed and evaluated the information provided by Entergy, in its application.

Based on this review, it was determined that additional information is required to complete the staffs evaluation for the license amendment request. In order for the staff to meet the established due date, the licensee needs to respond to the request for additional information (RAI) within 30 days of the receipt of the RAI.

Thanks Kaly (N) Kalyanam1 PM, ANO-1 and 2 and Waterford 3 REQUEST FOR ADDITIONAL INFORMATION ON THE LICENSE AMENDMENT REQUEST TECHNICAL SPECIFICATION CHANGES AND ANALYSES RELATING TO USE OF ALTERNATIVE SOURCE TERM FOR ENTERGY OPERATIONS, INC.

ARKANSAS NUCLEAR ONE, UNIT 2 DOCKET NUMBER: 50-368

1. Describe the methodology used to verify that the minimum possible post-LOCA sump pH remains greater than 7.0. Specifically, please describe how the following parameters were accounted for in the calculation.

a. What is the maximum, beginning of cycle, boron concentration in the reactor coolant and borated water storage tank?

b. What is the minimum volume of water assumed in the calculation of post-LOCA sump pH?

c. What is the minimum quantity of buffering agent contained in the baskets?

d. What is the buffering agent used at ANO-2 (trisodium phosphate or sodium tetraborate)?

e. What assumptions are made for the dissolution time of the buffering agent?

f. Describe the analysis used to determine strong acid concentrations in the sump for a period of 30 days post-LOCA. Include a description of the calculations for hydrochloric acid, generated by radiolytic decomposition of Hypalon cable insulation, and nitric acid, produced by irradiation of water and air in the containment.

2. How do the calculations for the proposed AST sump pH analysis differ from the previous calculation of sump pH?

3. Provide the time dependant sump pH profile for the full duration of the LOCA analysis.

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Subject:

Request for Additional Information on the AST LAR - ME3578 Sent Date: 5/25/2010 9:59:55 AM Received Date: 5/25/2010 10:21:00 AM From: Kalyanam, Kaly Created By: Kaly.Kalyanam@nrc.gov Recipients:

RCLARK@entergy.com (CLARK, ROBERT W)

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