ML20249B109

PNO-76-025A:on 760213,Region I Ofc,Philadelphia,Confirmed That Unplanned Release & Ground Level Contamination Event at Millstone Unit 1 Has Not Resulted in off-site Contamination or Personnel Overexposures

ML20249B109
Person / Time
Site:	Millstone
Issue date:	02/13/1976
From:	Dreher F, Roy G, Thornburg H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-76-025A-01, PNO-76-25A-1, NUDOCS 9806220073
Download: ML20249B109 (2)

Text

YOfk OjlR M tz t Q j. W ) }Mv!h)AL-February 13, 1976

/ PRELIMINARY N0"FIL .ON OF EVENT OR UNUSUAL 0"URRE 2 -PNO-76-25A This preliminary notification constitutes EARLi notice of events of l POSSIBLE safety or public interest significance. The information l presented is as initially received without verification or evaluation and is basically all that is known by OIE staf f as of 4:00 P.M. on date of this notification. IT SHOULD BE SPECIFICALLY NOTED THAT THIS NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT l NOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) SUBSEQUENTLY l WILL BE ISSUED IF WAPJ1 ANTED.

Facility: Millston'e Point 1 and 2 (DNs 50-245 and 50-336)

Subject; UNPLANNED RELEASE AND GROUND LEVEL CONTAMINATION Our Region I Office, Philadelphia, has confirmed that the " Unplanned Release and Ground Level Contamination" event at Millstone Unit I has not resulted in off-site contamination or personnel overexposure. It appears that the total release is approximately 5 m1111 curies. The water loss is estimated at one or two hundred gallons. The release can be categorized  !

- as being " minor" and of "no consequence." If the release was all iodine, the most restrictive isotope, the release would have been a minute fraction of one percent of the annual discharge limit from the stack. Minor Bround contamination has been collected in drums for decay or for subsequent j removal from the site. All site conditions are normal. l l

Preliminary reports from three NRC inspectors on site indicate that there I were no operator errors. There were no equipment probic=s other than the one problem associated with the isolation condenser system. Apparently a tube in the isolation condenser failed. This condition is an anticipated and evaluated situation. Releases from the shell of the isolation condenser to the atmosphere are specifically monitored by radiation detection equipment to identify a tube failure. The attached figure illustrates the design.

The plant is ready for startup; however, the tube failure has caused pipe movements in the isolation condenser system that must be analyzed to assure that the interfaces with the primary system were not overstressed. Region I C inspectors are on site. [

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, Media interest has been worldwide. -

All Northeastern States have been informed of the facts by Region I.

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A press release (No. 76-7) was issued at 1:00 p.m., Friday, February 13. c

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Contact:

FADreher, IE x27261 GWRoy, IE x27353 HDThornburg, IE x27541 d Distribution:

I Chairman Anders Commissioner Mason S. J. Chilk, SECY

( Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE Commissioner Kennedy C. C. Kammerer, CA L. V. Gossick, J. G. Davis, OIE J. A. Harris, PA B. C. Rusche, NRR J. La Fleur, ISP T. J. McTiernan, AIA K. R. Chapman, NMSS H. K. Shapar, ELD

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PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE

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