ML20245A498
| ML20245A498 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 04/01/1987 |
| From: | Rivenbark G Office of Nuclear Reactor Regulation |
| To: | James O'Reilly GEORGIA POWER CO. |
| Shared Package | |
| ML20204G396 | List: |
| References | |
| GL-83-08, TAC-57156, TAC-57157, NUDOCS 8704060264 | |
| Download: ML20245A498 (2) | |
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Dear Mr. -Of Reilly:
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, 11 MARK'I CONTAINMENTiDRYWELLiVACUUM' BREAKERS
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Our', Generic Letter 83-081 related6to modification ofEvacuum' breakers ;on Markllo 4" ", ' $
n containments identified a. potential failure >modeLofLthe wetwell/drywell vacuum 1 c
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breakers.in chuggingjand condensationioscillation'phaseslof;bloyidown/to jhe.( ' '
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torus'during.a. loss of coolantiaccidenti LInTthat Generic Letter we? requested
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1 that the impacted licensees-provide!a.commitsentyto' submitithe results: oft.
j plant unique, calculations which either formed)the: bases 1for. modifications'to;
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By a' letter dated June' 9,;1983Jyou~ provided a response to Generic Letter? _
9 83-08,' submitting the'results of anlevaluation!that pou; stated demonstrated d
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L On Jan.uary 17, 1986 wesentyouaRequest'forJAdditionaliInformation1(RAI).
The purpose of this RAI was to obtain: verification that;thespalletiimpacti 3
velocity'used in" your vacuum breaker stressianalysis was determined using thes a
approved methodologyLconsistent with the conditionstand restrictions
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prescribed by.the staff.
Your; reply dated March 13 L1986?confirmedithat*youl <
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used'the approved. methodology.
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The staff's technical assistance contractor,1FrankliniRessarch Centsrj(FRC)/
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, has reviewed the results of your stress analysis toiverify that theivacuum;
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- analytical. model of the' valve' are within Lthe' ASMETcode all(owable values 7 breaker stresses calculated by using the-pallet impact velocity asTinput'to; L
for the materials used.
Copies our' Safety Evaluation and thelFRC Tech'nical?
Evaluation are enclosed'..
A Basedonourreview,we; conclude!thattheanalSicalmethoduse'd!to:evaluatei l
critical" stresses is adequate, the' maximum' stress:in'the Hatchtvacuunitbreake?s' d
is less'than'30%1of the; Code' allowable,'and the existing designLisy f
H structurally adequ' ate' and: requires. no. modification. <
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'y g :.[ J iThis ; completes;ourdeview of Multipian.t:- ActionL Item 1D-20Tfor the' Hatch Nuclear :=
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' George W. Rivenbarli,.... Project Manager-1)
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. Bruce'W.f Chr^uc, hill,. EsquireK.
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Engineering. Department 4 D
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Post Office Box l45452 7x
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1 Nuclear Safety land Co'mpliance ManagerJ J
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s Edwin I. Hatch: Nuclear Plant:
Georgia Power Compa'ny:'
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' Post Office: Box 442-n;;
Baxley, Georgia. 31513-h
- V-1 Mr. Louis' B. Long
<m,d Southern Company Services,. Inc..
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Birmingham,iAlabama' 35202
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m Regional Administrator,. Region'II ilf 5 1
M U.S. Nuclear Regulatory:Comission,.
4 101'Marietta -Street, Suite 2900 m
Atlanta, ' Georgia 30303' e
'j Mr. Charles H. Badger a
10ffice of Planning and Budget:
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1 Room 610 Y
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Mr. J. Leonard.Ledbetter, Commissioner 1
' Department of Natural Resources-270 Washington Street, N.W.
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