ML20099C943
| ML20099C943 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 11/15/1984 |
| From: | Spangenberg F ILLINOIS POWER CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| U-0762, U-762, NUDOCS 8411200126 | |
| Download: ML20099C943 (2) | |
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" CLINToN POWER STATION. P.o. BOX 678, CLINToN. ILLINOIS 61727a
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Director (of; Nucle'ar(Re.actorjRegulation i
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Subject:
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- Local Encroachments: Issue.
Related+to ths Humphrey Concerns?
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Dear?Mr.2Schwencer:
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e In'let_teriU-0756jdated Oct$ber-24 1984,dllinois: Power Company,
.provided the,NRC;with-a program to, resolve the local' encroachments issu'e, j@j -
relatedjtog the'Humphrey concerns.- This program is divided'into two; parts' - a. generic program," established'by the Containment Issues;0wners (Group (CIOG),fand.a plant-specific program ~. In :Illinoik Power's plant-specific program, we committed to determine lo' ads from'1/10-scale
encroachments'te'sts and provide load application information, for which'
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the. adequacy /ofl structures can be determined.
A plant-specific.loadLhas been established from the 1/10-scale encroachments tests consistent with General Electric's generic methodology. : Loads were. determined on structural beams and the concrete JG
. portion of the Hydraulic Control Unit (HCU)-floor based upon observations from the. tests on' pool surface curvature,. velocity and U,_
-water ligamentithickness. The' methodology for which these loads were~
n developed will.be presented to the NRC by the CIOG in mid-November.
The load was applied to the entire-HCU ficor. However, only the area between 54*jand 76* (approximately 351) lies directly above the l
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-. encroachment.. Applying the load over the entire floor is a conservative 1R representation of the' actual' impact area.. An assessment of the HCU floor structure has'been: completed using this load. The'results of this E
iwork have indicatedithat the floor is capable-of withstanding this loading.
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$755'-0" and.between azimuths 43*iand276':will.belevaluated'for water)
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" iimpact loads observed lfrosi the" encroachments; testis. : A submittal.toi the:
JNRC-lproviding the' details's,'cf;the HCU floor analysis,and:the evaluations!,
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- of the piping' and other ' structures /is::anticipatedjby; December; 1;;:1984~.,
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. - 1:iPlease contactius /should you require further information.
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- B.--I.! Siegel[NRC.Clinton:L' censing' Project: Manager L
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Regional Administrator, Region III USNRC;,
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