ML20085L891

Ro:On 710710,while HPCI Test Being Set Up as Part of Startup Test Program,Hpci Turbine Stop Valve Would Not Would Not Reset.Caused by Improperly Positioned Limit Switch on Valve

ML20085L891
Person / Time
Site:	Dresden
Issue date:	07/12/1971
From:	Hoyt H COMMONWEALTH EDISON CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20085L879	List: ML20085L876 ML20085L885 ML20085L891
References
NUDOCS 8311030342
Download: ML20085L891 (1)

Text

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Commonwealth Edison Company ONE F1RST NATIONAL PLAZA

• C H I C A G O.

ILLINOIS 1

Address teoly t..

POST OFFICE BOX 767

• C H I C A G O, ILLINOl$ 60490 Dresden Nuclear Power Station R.R.#1 Morris, Illinois 60450 July 12, 1971 l

l Mr. Boyce Grier, Director A.E.C. Compliance, Region III 799 Roosevelt Road I

Glen Ellyn, Illinois 60137

SUBJECT:

DPR-25, DRESDEN NUCLEAR POWER STATION, UNIT 3, LEITER IN LIEN OF TELEGRAM DUE TO WESTERN UNION EMPLOYEE STRIKE PER SECTION 6.6. A.1 0F THE TECHNICAL SPECIFICATIONS CONFIRMING TELEPHONE CONVERSATION WITH MR. E. A. JORDAN ON JULY 11, 1971.

Dear Mr. Grier:

A High Pressure.Co61 ant Injection (HPCI) test was scheduled as part of the startup test program for Dresden Unit 3 with the reactor pressure at about 350 psig.

While the HPCI test was being set up, at 9:30 P.M. on July 10, 1971, it was found that the HPCI turbine stop valve would not reset.

The trouble was traced to a limit switch on the HPCI turbine control valve which was improperly positioned. The limit switch was adjusted by midnight on the same date and a successful test was run on the HPCI at 12:30 A.M. on July 12,19/1 The HPCI was last successfully run on July 6,1971.and it is felt that the limit switch went out of adjustment at the conclusion of the test.

A further report will be made in accordance with Section 6.6.B.2 of the Technical Specifications.

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Sincerely,g B311030342 710718 '

4.\\G 4 w PDR ADOCK 05000249 H* K.HoYt g

PDR Superintendent h

HKH:LDB:rh cc:

Dr. P. Morris b

Telegram File

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8 141971 g

Qg Commonwealth 3dison Company ONE FIRST NATRONAL PLAZA

• C H I C A G O.

ILLINOIS m,..

,,1, POSTOFFICE SOX 767

• C H I C A G O.

IL L INOl5 60690 Dresden Nuclear Power Sta' Lon R.R.#1 Morris, Illinois 60450

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Q July 12, 1971 (TU /f NLl>Lj f g

% 51971u. ?

9 cfj$3fTsr I2 Mr. Boyce Grier, Director temes A.E.C. Compliance, Region III D 3*w ka 799 Roosevcit Road q

f Glen Ellyn, Illinois 60137.

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SUBJECT:

DPR-25, DRESDEN NUCLEAR POWER STATION, UNIT 3, LETTER IN LIEN OF TELEGRAM DUE TO WESTERN UNION EMPLOYEE STRIKE PER SECTION 6.6.A.1 0F THE TECHNICAL SPECIFICATIONS CONFIRMING TELEPHONE CONVERSATION WITH MR. E. A. JORDAN ON JULY ll,1971.

Dear Mr. Grier:

A liigh Pressure. Coolant Injection (HPCI) test was scheduled as part

-of the startup test program for Dresden Unit 3 with the reactor pressure at about.350 psig.

While the HPCI test was being set up, at 9:30 P.M. on July 10, 1971, it was found that the llPCI turbine stop valve would not reset.

The trouble was traced to a limit switch on the llPCI turbine control valve which was improperly positioned.

The limit switch was adjusted by midnight on the same date and a successful test was run on the HPCI at 12:30 A.M. on July 12, 1971 The HPCI was last successfully run on July 6, 1971.and it is felt that the limit switch went out of adjustment at the conclusion of the test.

A further report will be made in accordance with Section 6.6.B.2 of the Technical Specifications.

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Sincerely, k

un.O (h

II.K.Hoyt kg X r

a,/

Superintendent jufQ p' f 3168 IIKH:LDB:rh cc:

Dr. P. Morris

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Telegram File I.?Tll N

SENT REGION J