ML20084G965

Ro:On 711116,failure Occurred in Station Air Sys Resulting in Complete Loss of Air.Caused by Complete Rupture of 6-inch Stainless Steel Flexible Connection Mounted on Discharge Side of Air Compressor 1-2

ML20084G965
Person / Time
Site:	Oyster Creek
Issue date:	12/17/1971
From:	Finfrock I JERSEY CENTRAL POWER & LIGHT CO.
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084G962	List: ML20084G961 ML20084G965
References
NUDOCS 8304270199
Download: ML20084G965 (2)

Text

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. ;i M ADISON AVENU E A T F' U N C H O o W L Ro AD e M OR RIS T oWN. N. J. 07960 e 533 - 0111 December 17, 1971

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Dr. Peter A. Morris, Director h Division of React.cr Licencing United States Atende Energy Cc= mission O

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Dear Dr. Morris:

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Subject:

Oyster Creek Station Docket No. 50-219 ,,.

Locs of Station Air. System ,/

The purpece of this letter is to report to you the recent ,

locc of the Oyster Creek Station Air System.

On November 16,1971 at 9 :56 a.m. , while operating at a power level of lL42 IGlt, 495 ige grocs, a failure occurred in the Stat. ion Air Syctem resulting in a ecmplete loss of air. When the control rocn operatcr received a rod drift alvtre and observed individual control rods cera ming becauce the scram valves fail open at 25 to 30 prig, he scra ned the reactor manually. The '

time lapse between the failure and the scram could not have been greater than 5 minutes. The air pressure had decreased to approxinately 30 psig. As far as could be determined, all air-operated equipment operated as expected upon the loss of air.

The cau w of the air cystem failure was the complete rupture of a 6-inch stainlesc steel flexible connection mounted on the discharge cide of Air Ccaprecsor 1-2. Wheh the flexible

) connecticn failed, it struck the comprencor high temperature trip cvitch which caused-the cc=preccor to trip. Air Compressor 1-1 started autc atically but was unable to keep up with the air loss.

Subsequently, Air Cc=prescor 1-2 discharge valve van f, closed which isclated it frc= the air receiver and permitted the air preccure to build up. It is ectitated that pressure was

/p rectored to normal in approximately 15 minutes. There were no 3ft spare flexible connections at the site so a solid cpool piece g was fabricated an'i installed to provide a te=porary emergency l\ ;- back-up supply of air, and the compreccor temperature evitch hf f  %

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e Dr. Peter A. Morris alhe'II Docenbec 17, 1971 was repaired. It was alce noted thrt there was axial misalignment of t h= c ;m; rec: or discharge and the pipe ecnnected to the receiver.

This '::i t a] Lament var corrected prio ta installing the temporary spool piet-. A ruch crie: . ras placed for new flexible connectiens, and 11 ter.parary spool piece has been replaced with a new ecnnection for Air Compruco: 2-1. The connection vill tm replaced on Air Ccsprec~;r 1-1 cn soon ac it arrivec. L. additien , a study har been initiated to redeuicn the ccmpreccor discharde piping system to prevent a recurrence of this event.

Twenty-five copies of this report are attached.

Very truly yours, k.

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Ivan R. Finfr ek, J .

Manager, Nuclear Generating Stations IRF/pk

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cc:'Mr. J. P. O'Reilly, Director Divisien of Cc:pliance, Regien I l

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