ML20148J298
| ML20148J298 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 05/02/1972 |
| From: | Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Johnson W YANKEE ATOMIC ELECTRIC CO. |
| References | |
| NUDOCS 8011210674 | |
| Download: ML20148J298 (2) | |
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DISTRIBUTION M
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N. Dube, DRL (5)
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MAY 2 - 1972.
T. Laughlin, DTIE PDR f ocket File Local PDR (holding)
Docket No. 50-29 DRL Reading l
Branch Reading ACRG (16)
E. Tedesco Yankee Atomic Electric Company R. Vollmer, Clarence Hebron 3
ATTN Mr. Wendell P. Johnson R, Boyd, C. Roberts, EPA l
Assistant Vice President R. DeYoung, R. Schemel 20 Turnpike Road D. Skovholt, A. Burger Westboro, Massachusetts 01581 T. Carter, S. Teets Change No. 98 Gentlemen:
License No. DPR-3 This refers to your Proposed Change No. 98, dated April 26, 1972, request-j ing authorization to operate the Yankee reactor in the Core X configuration with 22 specified Inconel clad AgInCd-Zircaloy control rod assemblies and two proposed hafnium-Zircaloy control rod assemblies.
You have indicated in your letter that during refueling with Core X and I
pre-operational sting of each of the 24 control rod assemblies, you 0
identified two control rodw that exhibited offanormal resistance to rod k
motion. Thereforc, Yankee proposes to replace the two distorted AgInCd control rods with new hafnium control rods that were purchased as spares at the time such rods were used in previous Cores III, IV and V.
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We have reviewed the information you bave submitted including your evalu-i ation of the safety considerations associated with the proposed use of the x
hafnium-Zircaloy control rod assemblies during cperation of Core X.
We
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have concluded that acceptable performance of hafniu:n control rods has
{dh been demonstrated ciuring operation of the reactor with previous cores and that physics measurements made during startup testing of Core III have i
verified that the reactivity worth of hafnium rods is about 57. greater than the reactivity worth of the specified AgInCd in like core positions.
We have also concluded that the use of the two replacement control rods to be installed in locations of the " Shutdown Group D" will not decrease the margins of safety determined previously for Core X operations.
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i We have concluded that the itse of the two hafnitan-Zircaloy control rod assemblies during operation of Core X does not present significant 4
hazards considerations not described or implicit in the Final Safety
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Analysis Report, and that there is reasonable assurance that the health and safety of the public will not be endangered by operation of the y
Yankee reactor in the manner propor:ed. Accordingly, pursuant to Section j.
50.59 of 10 CFR 50, Change No. 98 is hereby authorized.
.y Av Sincerely,
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Donald J. Skovholt g
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Assistant Director for Reactor Operations Division of Reactor Licensing w.
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C. Duane Blinn, Esquire f
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Day, Berry & Howard 1
Counselors at Law 1 Constitution Plaza Hartford, Connecticut 06103 J
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