ML032230338
| ML032230338 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 07/03/2003 |
| From: | Alexion T NRC/NRR/DLPM/LPD4 |
| To: | Millar D Entergy Operations |
| Shared Package | |
| ML032260096 | List: |
| References | |
| Download: ML032230338 (3) | |
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ICA.W1ND0W§\\TEMP\\GW 001.MP C:\\WINDOWS\\TEMP\\G 0001.TMP
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IeI Mail Envelope Properties (3F04647B.B36: 0: 20628)
Subject:
Creation Date:
From:
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RAI FOR ANO-1 7/3/03 1:14PM Thomas Alexion TWA@nrc.gov Recipients entergy.com DMILIAR (MILLAR, DANA)
Action Transferred Post Office Delivered Date & Time 07/03/03 01:14PM Route entergy.com 07/03/03 11:42AM Files Size ANO-IMetamic RAIEMCB.wpd MESSAGE 736 Date & Time 35792 07/03/03 01:14PM Options Auto Delete:
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Concealed
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No None Yes Standard No None No Standard To Be Delivered:
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Immediate Delivered & Opened
I Thomas Alexion - RAI FOR ANO-1 Paae I I From:
To:
Date:
Subject:
Thomas Alexion MILLAR, DANA 7/3/03 1:14PM RAI FOR ANO-1
- Dana, See the attached.
Tom
REQUEST FOR ADDITIONAL INFORMATION MATERIALS AND CHEMICAL ENGINEERING BRANCH REQUEST FOR LICENSE AMENDMENT DATED APRIL 2.2003 ARKANSAS NUCLEAR ONE UNIT 1
- 1.
The submittal references a topical report submitted to the staff on August 8, 2002. This topical report describes the physical and chemical properties of Metamice as well as the test results supporting the use of MetamicS in fuel pool applications. The staff notes the types of coupons tested and discussed in that report; i.e., 15 weight percent (wt %) or 31 wt % B4C, mill-finished or anodized.
Based on the information provided In the submittal, the staff requests the licensee to address the following:
- a.
Identify if the 25 wt% B4C MetamicS poison inserts to be used are mill-finished or anodized.
- b.
The topical report concludes that corrosion on both mill-finished and anodized MetamicS coupons Is due to inadequate cleaning of the surface. Discuss the cleaning technique to be used on the inserts prior to installation, its acceptability, and its expected effectiveness in controlling impurities.
- c.
If anodized inserts are to be used, discuss the anodizing process used for these inserts and its effectiveness in reforming the protective oxide layer in the event the surface should be scratched. Discuss the process used to ensure that the protective oxide layer will be formed adequately during installation.
- 2.
The Metamic coupon sampling program is briefly discussed on page 5 of Attachment 1 to the submittal. The licensee commits to establishing this program to monitor the physical and chemical properties of MetamicS over time. Metamic coupons will be suspended on a mounting tree and inserted into an empty fuel cell in a rack that is surrounded by spent fuel assemblies. A total of 10 coupons will be created from the same lots that will be used to manufacture the inserts.
MetamicO is a new material to be used in the spent fuel pool environment. While the staff agrees that a coupon sampling program is prudent and critical in verifying the assumptions used in the spent fuel pool criticality analysis, details of this program were not provided in the submittal. Therefore, the staff requests that the licensee discuss the following:
size and types of coupons to be used; i.e., similar in fabrication and layout to the proposed insert including welds and proximity to stainless steel; technique for measuring the nitial B4C content of the coupons; simulation of scratches on the coupons; frequency of coupon sampling and its justification; and tests to be performed on coupons; e.g., weight measurement, measurement of dimensions (length, width and thickness), and B4C content.