ML19296D429

LER 80-018/03L-0:on 800207,during Normal,Full Power Operation,Hydraulic Control Unit Accumulator 42-23 Received Low Pressure Alarm.Caused by Failure of Nitrogen Cartridge Valve from Wear Due to Constant Use

ML19296D429
Person / Time
Site:	Hatch
Issue date:	02/25/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19296D424	List: ML19296D423 ML19296D429
References
LER-80-018-03L, LER-80-18-3L, NUDOCS 8003040572
Download: ML19296D429 (2)

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oi?i i alarn was received. The acctmulctor was determined ta_!Le ingpftr.Able- CRD 34-27 had I oi,  ! ben inocerable since 1-30-80. Tech Specs section 3.3.B.3.4 states that at least 4 I oi5 Lgpmtal1c_ 2 control rods must separate anv 2 inop_e_rable ones. This is not a repetitive 1 o o I occurrencs. There were no effects up_on Dublic health and safety due to this event. 1

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i' J c 4J 47 43 44 47 c-u:- ~ . m: .. > =, nc a ; , :nu.. g i IlPCN accu ~uiator -; b e r ro inne rable v.nen the nitrocen cartridce valve failed 1I I f rom we a r c u m b_co n'; Lc n : usam. CR0 34-27 was already inocerable. Tho cartridon i . ; i valve (LP 111) uas r ai;.ccd, returning the CRD to operability within Tech Specs tin.e i i l recuir: r.s. Ti'= mi t is in full canaliance, and no further recortino is reauirod. I i i i i I

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nARPATI'!E REPCRT G~org:, Power Cerany Plant . I. Hatch Baxli;, Georgia 3!513 Repo rtable Occurrence Report t'o. 50-321/1980-018 at 19C1 CST on 2-7-80, a low nressure alarm was received on HCU accumulator 42-22. Uoon investigatien it was discovered that the accumulator would not hold a nitrocen charge due to a leaking cartridge valve (EP 111) on the ac-cu.uiator nitrogen charging mechanism.

Tech Snecs section 3.3.B.'.4 states that at least 4 operable control rods must separate any 2 inoperabi'e ones. If this cannot be met, the unit must be brought to cold shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Control rod 34-27 had been inoperable by Tech Specs since 1-30-80, due to a charging water valve which

',t coen and which must he repaired in cold shutdown.

2_ : ~ J ' T "n :-7-E]. tne cartricce valve was replaced, and the accumulator cn i r' o n tn nitrocen. Inis fulfilled the Tech Specs requirements, and shut-m o not necessary.

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2:::ination, tne valve failure was determined to have been caused by ey.cm-i/e packing wear. This event is neither a repetitive nor a generic occur 2nce. ' n i c 2 was unaf fected. The unit is now in full compliance, u

and no furtner reporting is required.