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PREI.IMINARY NCTIQCATIOb
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December 13, 1977 l
l PREI.IMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-77-220 This areliminarv notificatfort constitute _s EARLY notice of an event of' POSSISLE safety or oublic interect sig'tificance.
The information s
1 presented. is as initially received without verification or evaluation and is basically all that is knovm by IE staff on this date.
Facility:
Millstone Unit No.1 (DN 50-245)
Waterford, Connecticut
Subject:
EXPLOSION IN OFF GAS SYSTEM An explosion occurred ist the Off Gar System at approximately 9:30 AM. The
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Plant was operating at 90 percent rated power with a stac of 30,000 microcuries per second. A plant shutdown was initiated due to
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loss of monitoring instrumentation.
At approximately 1:00 PM, with power now at 15 percer.t. a second explosion occurred in the stack building,..It is assumed that this explosion resulted from-ignitiorr of hydrogen (an~d oxygen' that had collec:ed in the basement of the stack following the loss of loop seals in the initial explosion. A door was blown off and some contamination of the area arocnd the base of the stack
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occurred. The plant was imediately tripped and Maie Steam Isolation Valves shut to halt further release.
The plant is proceeding to cold shutdown an-1 ticipated by 5:00 PM.
2 A site emergency has been initiated and local authorities notified. No air-j borne problem is anticipated. The wind is blowing over Long Island Sound.
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One man was knocked down and contaminated by the blast. The man was not j
seriously injured, but was taken to the hospital for examination.
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Region I has dispatched two inspectors to site.
The explosion was heard over a large area and news media imediately began covering the story. A press release is planned by Region I and the licensee.
CONTINUED 0301100113 821207 i
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-i e-Page 2 PNO 220 Continued November 13, 1976 l
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i NRC', Region I (Philadelphia) received notification df this occurrence by telephone from the licensee at 12:55 PM, December 13, 1977.
The information is current as. of 3:0a PM, December 13,.1977.
Contact:
G8tdinger, IE. x28188 LJC.'anningham, IE x28188 LEHigginbotham,'x28098 Distribution:
Transmitted H St Yl3 8 Chairman Hendrie Comissiorair Eradford Comissioner Kennedy S
J. Chilk, SECY C. C. Kannerer, CA j
Comissioner Gilinsky (For Distribution)
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Transmitted: MNBB @ J b P B1dg /fJ f E. Valgenau. IE j
L. V. Gossick, EDO E. G. C'ase, NRR Region %, g;3 7
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S. H. Hanauer, EDO 3
J. J. Fouchard, PA SS Bldg h,, m770 7 4 MIL) f R. Hartfield, MIPC C. V. Smith, NMSS R. J. McTiernan, OIA R. G. Ryan,. OSP R. Minogue, SD H. K. Shapar, ELD
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PRELIMINARY NOTIFICATION I
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