ML20084G965
| 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: |
| References | |
| NUDOCS 8304270199 | |
| Download: ML20084G965 (2) | |
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N.-l 4-t yp Jersey Central Powe(id & Ligllt Company R{' p'/
- 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 AMD.
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h O g O g gM Dr. Peter A. Morris, Director Division of React.cr Licencing q
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United States Atende Energy Cc= mission f
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Dear Dr. Morris:
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Subject:
Oyster Creek Station Docket No. 50-219 Locs of Station Air. System
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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
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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.
f, Subsequently, Air Cc=prescor 1-2 discharge valve van 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 7 [
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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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