ML20151X593

PNO-77-140:on 770805,while Unit 2 & 3 Were Operating & Unit 1 Was Shutdown,Chemical Spill Occurred in Area Below Control Room.Control Room Ventilation Sys Was Switched to Alternate Mode Which Cleared Control Room of Fumes

ML20151X593
Person / Time
Site:	Dresden
Issue date:	08/05/1977
From:	Klingler G, Noland F, Sniezek J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-77-140, NUDOCS 9809170167
Download: ML20151X593 (2)

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't PRELIMINARY NOTIFICATION August 5, 1977 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-77-140 1 This areliminary notification constitutes EARLY notice of an event of l _POSSI 3LE safety or public interest significance. The information

) presented is as initially received without verification or evaluation

_and is basically all that is known by IE staf.f on this date. '

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l l "' . Faci 4ity: Commonwealth Edison. Company, Dresden Unit Nos. 1, 2 and 3 (DN-010,-237,-249)-

Subject:

CONTROL ROOM ATMOSPHERE DEGRADED BY ACID AND' CAUSTIC FUMES At approximately 1:15 a.m., on August 5,1977, while Unit Nos. 2 and 3 were operating and Unit No. 1 was shutdown, a chemical spill occurred in an area below the control room. While filling the sulfuric acid and caustic tanks in the make-up demineralizer area, the operators atten-tion was diverted and both tanks overflowed. Severe fuming resulted and these fumes entered the control room ventilation system, filling the control room with fumes. All control room personnel were placed

,in Scott Air Pack breathing apparatus.

The control room ventilation system.was switched to an alternate mode which cleared the control room of fumes in approximately 25 minutes, and control room personnel were able to operate without the Scott Air . .

Pack breathing apparatus.

The area in which the spill occurred was inaccessible due to the fumes,

. thus, the overflow continued until remote isolation of the system was accomplished. The event was teminated in approximately two hours.

There were no personnel injuries.

This PN is being issued because tiie occurrence is considered to be of potential public interest.

No press release was planned by the licensee or Region III (Chicago).

r' Region III (Chicago) inspectors were' dispatched to the site to review this event on August 5, 1977. i CONTINUE

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9809170167 770805 PDR IkE PNO-77-140 PDR A c; ;Ju l

.., Page 2 August 5, 1977 Continued PN0-77-140

- l Region III (Chicago)' received notification of..this occurrence by  ;

telephone from the Shift . Engineer, at 10:20 a.m., on  !

August 5, 1977.

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Contact:

GKlingler, IE x20818 FNoland, IE x20819 JSniezek, IE x20819 Distribution: Transmitted H St f/d ; .

.g Comissioner Kennedy C. C. Kammerer, CA

• G. F. Murphy, JCAE Comissioner Gilinsky S. J. Chilk, SECY H. H. Whites,ide,7SCNR l

-H. R. Myers; HCEE i Tran$mitted: MNBB M PBldgI'.)/ SS Bldg Y / h L. V. Gossick, EDO E. G. Case, NRR C. V. Smith, NMSS S. H. Hanauer, EDO J. A. Harris, PA W. G. Mcdonald, MIPC Luge (MAIL E. Volgenau, IE  ;

R. G. Ryan, OSP T. J. c ernan, OIA Region g gjj T H. K. Shapar, ELD {

PRELIMINARY NOTIFICATION l 1 j .e -

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