ML19253A578

LER 79-024/03L-0:on 790804,on Three Occasions Between 790804-16,total Primary Coolant Oxidants Exceeded 10 Ppm W/Core Average Outlet Temp Greater than 1,200 F.Caused by Dryer Bypass Resulting in Water Ingress to Core

ML19253A578
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/31/1979
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19253A577	List: ML19253A576 ML19253A578
References
LER-79-024-03L, LER-79-24-3L, NUDOCS 7909100359
Download: ML19253A578 (1)

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DATE 7 8 60 61 COCKET NUM8ER EVENT DESCRIPTION AND PROBABLE CONSEOUENCES h o 2 l Cn three occasions during the period August 4, 19 79, through August 16, 1979, total I o 3 primary coolant oxidants (sum of water, carbon monoxide, and carbon dioxide) ex- l l ceeded 10 ppm with core average outlet temperature greater than 1,200*F. This con-o 4 g  ; stitutes operation under a degraded mode permitted by LCO 4.2.10 and is reportable l o 6 per Technical Specification AC 7.5.2(b)2. l I

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SYSTEM CAUSE CAUSE V ALV E CODE CODE SU8 CODE COMPONENT CCDE SL8C00E SU8 CODE

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EVENT YE AR REPORT NO. CODE TYPE NO.

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_,21 22 23 24 26 27 28 29 30 31 32 ACTIO N FUTURE EFFECT SHUTOOWN ATTACHMENT NP R O-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOO HOURS SUBMITT ED FORMdu8. SUPPLI E R MANUFACTURER lx l@l2 l@

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1 o l L CO 4. 2.10 p rimarv coolant imp uri tv limits vere exceeded durine drvine out op era ti ons I i 1 l following the first refueling. A previous drver bvoass resultine in water imec &

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7 l the core and breakthrough of the curification train contributed to increased oxidant l

i 31 l levels observed.

I 3 i4 l 80 7 8 9 5A S  % POW E R OTHER STATUS 015 0 RY O'SCOVERY DESCRIPTION s

l C l@ bl 4l 3l@l N/A l lA l@l Operator Observation l ACTIVITY CO TENT OP RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 lZl AELEASE@D Z l@ N/A l N/A l 7 d 9 10 tt 44 45 80

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