ML20085L852

Ro:On 710725,upper Isolation Valve for Scram Discharge Tank Level Switch 302-8A Found Closed.Cause Unknown.Valve Immediately Reopened

ML20085L852
Person / Time
Site:	Dresden
Issue date:	07/26/1971
From:	Hoyt H COMMONWEALTH EDISON CO.
To:	Grier B US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085L840	List: ML20085L842 ML20085L852
References
NUDOCS 8311030305
Download: ML20085L852 (2)

Text

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.; V 3 4 O Commonwealth Edison Company ONE FI R S T N A T IO N A L PLAZA

• CHICAGO B L LI N OI S

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I cost oe r ec e sox rer

• cnic Aco, a t tinois edae o Dresden Nuclear Power Station R. R. El Morris, Illinois 60450 July 26, 1971 Mr. Boyce Grier, Director A.E.C. Compliance Region III 799 Roosevelt Road -

Glen Ellyn, Illinois 60137

Subject:

DFR 25 Dresden I!uelcar Power Station Unit 3 Lotter in lieu of telegrm because of liest.crn Union employco strike. Confirming conycrnations with Mr. E. A. Jordan and H. Dance on July 26, 1971 "

Dear I*r. Grier:

At 0153 on 7/25/71, the upper isolation valve for Scram Dischar;;e Tank level switch 3C2-?A vas found closed. This was discovered during investigation of discharge tank draining difficultics following a planned reactor scram at 2242 on 7/24/71 as part of STI 25 at 25% reactor power.

The valve was reopened immediately.

The valve was verified open during system valvo checks on 6/11/71 and 7/3/71. The valve was closed and then reopened on 7/10/71 for surveillance required by Tablo 4.1.1 of the Technical Specifications.

The time and n.othod of closing the valve is unknown at this time.

Amplifying information will be reported as r9 quired by Section 6.6.B of the Technical Specifications.

/S Sincerely, W71 Xg .

/, .h

!!. K. Hoyt Superintenden.

HKil:GPU:ls '

cc: Dr. P. Forris 10Og5} P S

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.,, MEMO ROUTE SUP _

I Form AEC-9) (Rev. May 14,1947) AECM . 40 Note and return. For signature. For Information.

IMY1ALS RE MARKS TO (Name and unit)

J. G. Keppler CO:HQ uTE TO (Narne and unit) MTIALS REMARKS 4 DATE o

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INTIALS REMARK $

TO (Name and unit) un F M (Name unit) REM ARKS ~

M M ^**achaa fa cha neieinal nf n terrer frnm Commnnvealth Edison D. M. unnicutt CO:III dated 7-26-71, in lieu of telegram, reporting a malfunction 1

in the Scram Discharge Tank level switch. } h

, PHONE 9eth DATE ,, r r,.3 <

7-29-71 [F6p'sent PDR  :

usE oTHtR sioE rom Acc.Tm RtMARKs

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