05000366/LER-1981-026-03, /03L-0:on 810406,during Attempt to Clear High Moisture Content Alarm,Standby Gas Treatment Sys B Heater Would Not Start.Caused by Misconnection of Unlabeled Sensor Cables.Cables Labeled & Reconnected & Procedures Revised

/03L-0:on 810406,during Attempt to Clear High Moisture Content Alarm,Standby Gas Treatment Sys B Heater Would Not Start.Caused by Misconnection of Unlabeled Sensor Cables.Cables Labeled & Reconnected & Procedures Revised

ML20003H965
Person / Time
Site:	Hatch
Issue date:	04/30/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003H963	List: 05000366/LER-1981-026, Forwards LER 81-026/03L-0 05000366/LER-1981-026-03, /03L-0:on 810406,during Attempt to Clear High Moisture Content Alarm,Standby Gas Treatment Sys B Heater Would Not Start.Caused by Misconnection of Unlabeled Sensor Cables.Cables Labeled & Reconnected & Procedures Revised
References
LER-81-026-03L, LER-81-26-3L, NUDOCS 8105080247
Download: ML20003H965 (2)

LER-1981-026, /03L-0:on 810406,during Attempt to Clear High Moisture Content Alarm,Standby Gas Treatment Sys B Heater Would Not Start.Caused by Misconnection of Unlabeled Sensor Cables.Cables Labeled & Reconnected & Procedures Revised

Event date:
Report date:
3661981026R03 - NRC Website

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60 61 DOCKET NUYHER 68 69 EVENT DATE

/4 75 HEPORT DATE 80 EVENT DESCnlPTION AND PROB ABLE CONSEQUENCES h lo l2l l With the reactor at steady state power of 2430 Mut, tne reactor operator l

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attempted to clear the high moisture content alarm on "B" SBGT per HNP-l O

l 2-2503, SBGT System Filter Trouble.

"B" SBGT heater would not start. Tech l

[O lsi l Specs Section 3.6.6.1 requires two operable subsystems. This requirement l

0 s l was not met. SBGT Subsystem "A" was operable. The unit was placed in a l

l0l7ll 7 day LC0 as per Tech Specs section 3.6.6.1. The public's health and l

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This event is non-repetitive.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li t ol l The event cause was inadequate procedure. Relative humidity sensor cables l

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were swapped when doing HNP-2-3653, SBGT System Operability. The pro-1 i, 12i i cedure had both cables disconnected at one time. The cables, being un-l l i l 31 l marked were reconnected wrong. The cables were labeled, reconnected prop-l lii. i l erly and the procecure revised. "B" SBGT was made operable within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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DISCOVEHY DESCRIPTION li l s l [E_J@ l 1 l 0 l 0 l@l NA l

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R. T. Nix, Supt. of flaint.

mW-M pgggg NAME OF PREPAHEH

i Il LEP. fio. : 50-366/1981-Ciu Licensee: Georgia Power Company Facility: Edwin I. Hatch Docket No. : 50-366 flarrative Report LER flo. 50-366/1981-026.

On April 6,1981, with the reactor at steady state power of 2430 !'ilt, the plant operator attempted to clear a high moisture content alarm on the Standby Gas Treatment Subsystem "B" per HNP-2-2503, Standby Gas Treatment System Filter Trouble.

The "B" SBGT heater would not energize.

S3GT Subsystem "B" was declared inoperative. Technical Specifications Section 3.6.6.1 requires two operable SBGT subsystems, the requirenent was not met.

A seven day limiting condition of optration was initiated per Technical Specifications Section 3.6.6.1.

The public's health and safety were not affected.

This event is non-repetitive.

The cause of this event has been attributed to procedural inadequacy.

Standby Gas Treatment Subsystem "G" relative humidity sensor cables were swapped while performing H!!P-2-3653, Standby 9s Treatment System Opera bi lity.

The procedure called for both the 50% and 70% relative hunidity sensor cables to be at one point disconnected at the same time.

The cables were not labeled and when reconnected they were connected to the wrong sensor. The cables were labeled then connected to the right p

sensor.

The procedure has been revised so only one sensor is removed d

at a time. A generic review of the Unit I procedure revealed that there is no need to remove the cables to the humidity sensors.

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