NLS2024055, Data from Metamic Coupon Sampling Program

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Data from Metamic Coupon Sampling Program
ML24211A055
Person / Time
Site: Cooper Entergy icon.png
Issue date: 07/29/2024
From: Dewhirst L
Nebraska Public Power District (NPPD)
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
NLS2024055
Download: ML24211A055 (1)


Text

NLS2024055 July 29, 2024 H

Nebraska Public Power District "Always there u:'hen yo1t need us" Attention: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Subject:

Data from Metamic Coupon Sampling Program Cooper Nuclear Station, Docket No. 50-298, Renewed License No. DPR-46

Reference:

Letter from Stewart B. Minahan, Nebraska Public Power District, to U.S. Nuclear Regulatory Commission, dated April 17, 2007, "Response to Request for Additional Information Regarding License Amendment Request for Onsite Spent Fuel Expansion" (ML071240495)

The purpose of this letter is for the Nebraska Public Power District (NPPD) to provide to the Nuclear Regulatory Commission surveillance data from the Cooper Nuclear Station (CNS)

Metamic coupon sampling program. The purpose of the sampling program is to characterize certain physical and chemical properties of the Metamic sample coupons in the CNS spent fuel storage pool (SFSP). Per the referenced letter, NPPD committed to remove a Metamic coupon from the SFSP for testing after 2, 4, 8, 12, 16, 20, 24, and 28 years, including performance of a neutron attenuation test after 4, 12, and 20 years. This letter pertains to the 16-year test.

Coupon 102-087C-2 was removed from the SFSP after sixteen years and the testing results are provided in the Enclosure. Inspection results indicated no bowing, pitting, or swelling. All measurements were within close tolerances of the pre-irradiation baseline data and all inspection acceptance criteria were met. The results indicate the Metamic coupon samples are not degrading within the SFSP environment, which indicates the SFSP Metamic fuel storage rack is not degrading.

There are no regulatory commitments made in this submittal. If you should have any questions regardin this submittal, please contact me at ( 402) 825-5416.

L-,/Linda Dewhirst Regulator Affairs and Compliance Manager

/dv

Enclosure:

Testing Data for Metamic Sample Coupon 102-087C-2 COOPER NUCLEAR STATION 72676 648A Ave/ P.O. Box 98 / Brownville, NE 68321 http://www.nppd.com

NLS2024055 Page 2 of2 cc:

Regional Administrator w/enclosure USNRC - Region IV Cooper Project Manager w/enclosure USNRC - NRR Plant Licensing Branch IV Senior Resident Inspector w/enclosure USNRC-CNS NPG Distribution w/enclosure CNS Records w/enclosure

NLS2024055 Enclosure Pagelof3 Enclosure Testing Data for Metamic Sample Coupon 102-087C-2 Cooper Nuclear Station, Docket No. 50-298, Renewed License No. DPR-46

  • --------------------~

ATTACHMENT 1 COUPON DATA FORM ATTACHMENT 1 COUPON DATA FORM Visual Inspection Results:

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Performed By: ~.::1},4,/zo.2(/

I.D. No.

A B

C

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1"..J A

B C

PROCEDURE 10.24 REVISION 10 PAGE 7 OF 16

Serial Number Data Point Baseline Data February 2024 Data Delta of Base to 2024 Data 102-087C-2 A

6.186 6.191 0.005 B

6.174 6.177 0.003 Water Temp deg C C

6.157 6.16 0.003 22.3 D

4.095 3.997 0.098 E

4.088 3.994 0.094 Water Density F

4.088 3.992 0.096 0.9978 G

0.08 0.082 0.002 H

0.08 0.082 0.002 K

0.08 0.082 0.002 L

0.08 0.081 0.001 M

0.08 0.082 0.002 Weight (D) 86.28 86.78 0.579508577 Weight(W) 54.18 54.29 0.203026947 Density 2.68 2.665 Data for A through M is in inches. Weight is in grams. Delta of A through M is in inches. Delta for Weight is in% change.

l,AC for Wei_g_ht is,Oelta s; +/- 5%. AC for A through Fis s; +/-0.125". AC for G through Miss; +/-0.07.

Acceptance Criteria Good Good Good Good Good Good Good Good Good Good Good Good Good