05000321/LER-1981-087-03, /03L-0:on 810902,during Removal of Radioactive Matl from Fuel Pool,Containment Atmosphere Dilution Sys Analyzers Failed & Drywell to Torus Delta P Dropped Below Spec.Caused by High Radiation Levels

/03L-0:on 810902,during Removal of Radioactive Matl from Fuel Pool,Containment Atmosphere Dilution Sys Analyzers Failed & Drywell to Torus Delta P Dropped Below Spec.Caused by High Radiation Levels

ML20010J540
Person / Time
Site:	Hatch
Issue date:	09/25/1981
From:	Rogers W GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010J539	List: 05000321/LER-1981-087, Forwards LER 81-087/03L-0 05000321/LER-1981-087-03, /03L-0:on 810902,during Removal of Radioactive Matl from Fuel Pool,Containment Atmosphere Dilution Sys Analyzers Failed & Drywell to Torus Delta P Dropped Below Spec.Caused by High Radiation Levels
References
LER-81-087-03L, LER-81-87-3L, NUDOCS 8110050298
Download: ML20010J540 (2)

LER-1981-087, /03L-0:on 810902,during Removal of Radioactive Matl from Fuel Pool,Containment Atmosphere Dilution Sys Analyzers Failed & Drywell to Torus Delta P Dropped Below Spec.Caused by High Radiation Levels

Event date:
Report date:
3211981087R03 - NRC Website

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_ U. S. NUCLEAH HEGULA 4 OH f GUMMst ieOld i NRC FORM 366

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• LICENSEE EVENT REPORT COMVROL BLOCct:

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8 60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 t

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l TTTT1 l With the reactor at 2430 MWT, when-technicians were removing radio-I

! ITTT1 I active material from the fuel pool, the ' refueling floor vent exhaust i

i g O i4 l l radiation monitor tripped.

This resulted in both the containment atmo-I system H O2 analyzers to be inop. and the dry-l g l sphere dilution (CAD) 2 10181 t well to torus delta p to drop below 1.5 psid.

This resulted in a vio-I

'I l O ( 7 l l lation of Tech. Spec. Section 3.7. A.6 (c) and 3.7.A.7.

The health and

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l safety of the public were not affected.

This is not a repetitive event.1 lOggi

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li!Oi l Reason for the monitcir trip was high radiation levels.

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iiiiglis at 20 mr/hr.

The trip initiated a Group II isolation causing anal- _ l gyzers to be inop. and also drywell to torus delta p to drop below 1.5 l

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Radiation levels in the area were reduced by installing temporary l

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Systems were back to normal in about two hours.

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PDR ADOCK 05000321 ISSUED @j N/A S

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8 9 10 912-367-7751 NAME OF PREPARER.

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LER #:

50-321/1981-087 Licensee:

Ga. Power Co.

Facility:

Edwin I.

Hatch Docket #:

50-321

Narrative

Report for LER 50-321/1981-087 On September 2,

1981 while the eactor was operating at steady state power of 2430 MWT while the technicians were removing highly radioactive filter demins from the fuel pool, the refueling floor vent exhaust radiation monitor tripped.

This event caused a Group II isolation and resulted in isolating the (a) suction to the pumps connected to H2 and 02 analyzers and (b) drywell pneumatics.

The H2 and 02 analyzers became inop. and the drywell to torus delta p dropped below 1.5 psid.

This was a failure to comply with Tech Specs Section 3.7.A.6(c) and 3.7.A.7.

Neither plant operation nor public health and safety were affected.

This is a non repetitive event.

The cause of the event has been attributed to high radiation levels on the refueling floor.

The general area radiation levels were reduced by placing shielding (lead blankets and concrete filled dr ums), around the filter demins.

In the future, while performing any work involving high rad levels, health physics personnel have been cautioned to make careful estimates of radiation levels such that preventative methods, such as shielding, can be adopted to reduce these levels below the monitor trip setpoints.

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