ML20148P415

/03L-0 on 781102:reactor Maximum Cooldown Rate of 100 Degrees F Exceeded During Reactor Auto Scram & Vessel Depressurization.Caused by Personnel Error;Personnel Have Been Admonished

ML20148P415
Person / Time
Site:	Hatch
Issue date:	11/20/1978
From:	Baxley S GEORGIA POWER CO.
To:
Shared Package
ML20148P410	List: ML20148P415
References
LER-78-063-03L-01, LER-78-63-3L-1, NUDOCS 7811280220
Download: ML20148P415 (2)

Text

MQt.NSLQ (EVENY REPORT coninot utock:

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0'> bl L,'rA L T l.ti'J a! H id fe J IVLN1 DAll #4 l hEFO41 OAl E LJ cvt ot semPTiod AND s'HOULL.E CONSEQUEr:CLS h 70 j l Reactor maximum cooldoun ra te _ of 100 degrys F Per_ lLQUEJIU_.cyceeded on *,'cL_2.._.1928 ]

of,; [ Due to injection of condensate water into reactor vessel followinq a reactor scram I gj l from rated pressure, reactor pressure decreased di,Lq_t?_mjn_timbjnn seals supplied I o ;,,, , by nuclear steam to below condensate booster pump pressure and allowed condensate l o g,, l water to be injected into reactor vessel through feeduater lines, resulting in a cool-1 o ,; ; doen rate of 119 degrees F. in a one hour period.

Reactor r1SIV's were closed and j gi injection of condensate water to vessel stopped, reactor coolant temocratures (con ' t )J BD + #

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Georgia Power Company s Edwin 1. Hatch Power ,

O caxies, ceorsie 31sia Reportable Occurrence f! umber: 50-366/1978-63 l

' Event Description Con't were back within limits in-15 minutes.

Evaluation of occurrence by reactor engineering confirmed that due to evaluatien of other temperatures indications for overall reactor coolant systems and '

by o');erving rccctor vessel metal temperatures (Delta T's) that no significant stress occurred'io reactor vessel or coolant systems. There were no personnel injuries '

or overexposure or any release of radioactive materials to the environs as a result  !

of this occurrence. -

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Cause Description Con't and to observe pressure decrease and level increase very closely in transient conditions to prevent exceeding reactor cooldcun rates.  ;

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