05000321/LER-1980-042-03, /03L-0:on 800429,valve 1E11-FO16A,RHR Outboard Containment Spray,Failed to Open.Caused by Sheared Key Between Motor Shaft & Pinion Gear.Pinon Gear & Valve Key Replaced & Valve Returned to Svc

/03L-0:on 800429,valve 1E11-FO16A,RHR Outboard Containment Spray,Failed to Open.Caused by Sheared Key Between Motor Shaft & Pinion Gear.Pinon Gear & Valve Key Replaced & Valve Returned to Svc

ML19323E440
Person / Time
Site:	Hatch
Issue date:	05/20/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19323E433	List: 05000321/LER-1980-042, Forwards LER 80-042/03L-0 05000321/LER-1980-042-03, /03L-0:on 800429,valve 1E11-FO16A,RHR Outboard Containment Spray,Failed to Open.Caused by Sheared Key Between Motor Shaft & Pinion Gear.Pinon Gear & Valve Key Replaced & Valve Returned to Svc
References
LER-80-042-03L-01, LER-80-42-3L-1, NUDOCS 8005230551
Download: ML19323E440 (2)

LER-1980-042, /03L-0:on 800429,valve 1E11-FO16A,RHR Outboard Containment Spray,Failed to Open.Caused by Sheared Key Between Motor Shaft & Pinion Gear.Pinon Gear & Valve Key Replaced & Valve Returned to Svc

Event date:
Report date:
3211980042R03 - NRC Website

text

U.S. NUCLEAR REGULATORY COM511SSION NRC F ORM 36G (7 7 H

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(.8 69 EVENT DATE 74 75 REPORT DAT E 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 l With the reactor in the run mode, while performinn the RHR Operabi-l 0 l 3 l *l lity Test, the 1E11-F016A valve, RHR Outboard Containment Spray. fa l

lO l4 l l iled to open.

This valve was required to be operabic per Tech. Spec.

1 O s l 4.5.C.

due to the IC Diesel being out for' Preventive Maintenance.

An l

O s l orderly shutdown was begun to comply with Tech. Spec.

3.5.G, This l0 l 7 l l event was repetitive in nature as last reported on LER 50-366/79-86.

l l O IR I l Public health and safety were'not'affected by this incident, 1

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33 34 35 36 37 40 41 42 43 44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h [1l0llThe valve failure was due to the key between the motor <: h a f t and motor I

li li j l pinion gear being sheared.

This permitted the shnft -t o rotate wi t h f r-I i 2 l the pinion gear.

Prior to the reactor beinn shutdown, t h e' 1C Diesel I

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The pinion near and key of the IE11-F016A l

Ivalve was then replaced and the: valve returned to ' service.

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NAME OF PREPARER pgggg;

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g NARRATIVE REPORT I

f Georgia Power Company l

Plant E. I. liatch

. Baxley, Georgia 31513 k

r Reportable Occurrence Report No. 50-321/1980-042.

With the reactor at 2420 MWt, on April 29, 1980, the IE11-F016A valve, R!!L Outboard Containment Spray, failed to open while' performing the RllR operability Test. This valve was required to be operable per Tech.

Spec. 4.5.G due to the IC Diesel being out for Preventive Maintenance.

An orderly reactor shutdown was begun to comply with Tech. Spec. 3.5.G, i

but was ceased af ter approximately 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> when the IC Diesel was returned to service.

The failure o,f the IEll-F016A valve was due to the key between the motor shaft and the motor pinion gear being sheared. This permitted the motor shaft to rotate within the pinion gear. The pinion gear and key were replaced and the valve returned to service on May 2, 1980.

A similar event was reported on Unit II, reference Reportable Occurrence No. 50-366/1979-086. There were no effects to public health and safety as i

a result of this incident.

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