05000416/LER-1982-058-03, /03L-0:on 820823,control Room Fresh Air Units a & B Not Fully Operable Due to Failure of Filter Train Heater to Energize.Caused by Failure of Air Flow Sensor in a & B Heater Switch When Placed in Test Position

/03L-0:on 820823,control Room Fresh Air Units a & B Not Fully Operable Due to Failure of Filter Train Heater to Energize.Caused by Failure of Air Flow Sensor in a & B Heater Switch When Placed in Test Position

ML20027B873
Person / Time
Site:	Grand Gulf
Issue date:	09/22/1982
From:	White A MISSISSIPPI POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20027B872	List: 05000416/LER-1982-058, Forwards LER 82-058/03L-0 05000416/LER-1982-058-03, /03L-0:on 820823,control Room Fresh Air Units a & B Not Fully Operable Due to Failure of Filter Train Heater to Energize.Caused by Failure of Air Flow Sensor in a & B Heater Switch When Placed in Test Position
References
LER-82-058-03L, LER-82-58-3L, NUDOCS 8209300248
Download: ML20027B873 (2)

LER-1982-058, /03L-0:on 820823,control Room Fresh Air Units a & B Not Fully Operable Due to Failure of Filter Train Heater to Energize.Caused by Failure of Air Flow Sensor in a & B Heater Switch When Placed in Test Position

Event date:
Report date:
4161982058R03 - NRC Website

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y NRC FORM 366 U. S. NUCLEAR REGULATOXY COMMIS$10N Attachment to AECM-82/416 LICENSEE EVENT REPORT Page 1 of 2 CONTROL BLOCK:

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 78 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l 0 l 2 l l On August 23, while performing an operability surveillance test, the Control Room l

l Fresh Air Unit "A" was not fully operable due to the failure of the unit filter train l O 3 0 4 l heater to energize.

- A Limiting Condition for Operation was entered pursuant to l

l0[3l lT.S.3.7.2, allowing 7 days for repair.

12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> later, an operability surveillance l

lO[ol l test was conducted on Control Room Fresh Air Unit "B" and it also was determined to bel O 7 [ inoperable due to the failure of its heater to energize. The effect was to reduce thej [Oisl l filtration efficiency of the HVAC. There was no effect to public or plant safety.

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47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h Q W IThe failed air flow sensor switch on Unit "A" was replaced.

Investigation l

l established that the "B" heater switch, on a local panel had been placed in " Test" 1 i i 7 lby person or persons unknown. Placing the switch in the operate position, and I

l replacing the flow switch made both units operable.

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Attechment to AECM-82/416 Page 2 of 2 Supplementary Information to LER 82-058/03 L-0 Licensee:

Mississippi Power & Light Company Facility:

Grand Gulf Nuclear Station - Unit 1 Docket'No.:

50-416

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The failure of the flow sensor switch is considered an isolated failure and no further. corrective action is planned. The placing of the "B" local switch in the " Test" position was personnel error and investigation was failed to reveal the cause of this error. No further action is planned.

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The heaters in the Standby Fresh Air Units serve to lower the inlet relar.ive humidity to prevent saturation of the charcoal filter media, thus increasing the efficiency of the filter for radioactive gases and/or vapors. No threat to the health and safety of the public existed nor was there a threat to plant safety. This is intended as a final report.

AEIN3