ML20244B845
| ML20244B845 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 02/08/1982 |
| From: | Widner W GEORGIA POWER CO. |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20236H997 | List: |
| References | |
| TAC-54378, TAC-54379, NUDOCS 8202160488 | |
| Download: ML20244B845 (2) | |
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E 2 Wi A. Widner February 8, ?l982 >
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Director;of tbclear Reactor Regulation
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-OPERATING LICENSE DPR-57
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EDWIN I. HATCH NUCLEAR PLANT UNIT l-IMMEDIATE' RELIEF FOR DRYWELL.INERTING-TECHNICAL SPECIFICATION h
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Gentlemen-
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'1 Pursuanti to 10 CFR -50.90, as required by ~10 CFR 50.59(c), Georgia Power ;
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. Company proposes 1 an amendment to the. Unit 1 Technical' Specifications
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(Appendix"A to the~ Operating ~ License).
Technical Specification 3.7. A.S.b - requires "withinithe 124-hour period :
/ subsequent to ' placing the reactor in the RUN mode following a' shutdown, the j
containment atmosphere ~ oxygen concentration shcIl be reduced to'less than 40 1
- byJvolume andLmaintained in this' condition".
However, during the startup.of February 7; L1982, Lit became apparent thatL there was ~an insufficient amount-
- i Lof' liquid nitrogen ' available to meetH this' 24-hour JLCO.
Additionally, j
resupplies ?are not available until after the 'LCO expires.'. We hereby request-1 a-one time extension :of the 24-hour-LCO to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> beginning at 3 'p.m'.
EST n,
on February 7, 1982.
Minimum levels '(2000 gallons) of nitrogen are being h,,
- mainta'ined to preserve operability of the Containment Atmosphere Dilution i
L(CAD). system per Technical Specification 3.7.A.6.b.
L Safety Evaluation'- Drywell Inerting b
The basis for a 24-hour requirement on attaining a 4 percent oxygen
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~ concentration following. entry into the RUN mooe is to minimize the i
possibility of. hydrogen combustion.following a loss-of-coolant accident.
The 24-hour period was established, as stated in the bases for specification 3.7_. A.5,. as being suf ficient to perform necessary drywell inspections and establish-the required oxygen concentration.
The control is administrative and supplements the CAD system.
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p The CAD system provides the basis for assuring containment integrity
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post LOCA.
Due. to the license date for Unit 1, the CAD system was installed l
to Lmeet. the then applicable regulations addressing. hydrogen evolution.
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.Q order to meet the currently applicable interim final rule, capability to q
q install portable hydrogen recombiners is being engineered, and, therefore, l
h/ g M*.7 orgia. Power.Comoany is in compliance with the regulations.
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%$e; ("g g4 Because3the (24-hourt limit X is h an l administrative ? control, m as ? opposed j to' l'
(providing "a /safetyffunction,duced 'bylallowing a'. : longer. period 'of time; margins of safety,f asi efine d
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? Specifications,Jareinotfre to?
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,,:completeidrywell;..'inerting-TheT safety marginbis ';providedj by7thei CAD; '
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system.
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- Addit.ionally, l due [tof plarb factars,.:' af maximumithe'rmal power flevel* of.-
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4Mlesshth'an'[ 50 f percent? will 'be reached.duriiig ithe reque'sted periddi.of(" ?,Y
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. Lextension. JWef estimate ithat :inithe expected ; rod pattern, marginst to Ethe l,,
i V:MAPLHCR limitMshouldLapproach 50 : percent,Jproviding i additionalFconservatism W. '
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,%y 1totthe analysis? accident' conditions.
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%,,,, 1 Extension 'ofithe drywell'inerting LCO Jalso necessitates anJe'xtenAion/of-..' y' ', y m
the: LCO} for TechnicalL Specificatiori; 3.7. A'.7. (1) dDrywell-SuppressionlChamber m
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-Dif ferential. Pressurei t for. a.' like! time ' period.' Re' quired differential-M y
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- pressurecannotbefestablisheduntil'inertingis-complete.D 7
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, g4 pni i jThis(submittai Jis; for immediate relief.: AL formal submittal,fincluding m *'
determination ^of amendment class,Lwill. follow.
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<..3 2 W, 1 W.E A. Widner ustates f that heJis Vicei President of...GeorgialPower Company cand,
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Jis l authorized Jto? execute this; cath Lon; behalf of ' Georgia Po.wer L Company,5 and -
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thatt to' the "bestiof his knowledge ' andL belief theJ facts set forth'in this '
'IB 1 M 11etter are true.,
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GEORGIA; POWER COMPANY-
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' 'l By:
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W. A. Widner r
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Sworni o and subscribed.before me this 8th day of February,1982.
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Notary Public, Georgia, State at Large
-Q My Commission E.xpires Sept. 20,1983 Q '/
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Notary Public e
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R. F. Rogers, III
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J.:P. O'Reilly (Region II - NRC) q; '
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