ML19322D935

Requests Info Re Notification & Followup Activities for 750613 & 770924 Transient Events at Davis-Besse & Oconee, & Actuation of Pressure Injection Sys at TMI-2

ML19322D935
Person / Time
Site:	Davis Besse, Oconee, Crane
Issue date:	02/05/1980
From:	Hart G, Simpson A SENATE, ENVIRONMENT & PUBLIC WORKS
To:	Ahearne J NRC COMMISSION (OCM)
Shared Package
ML19322D920	List: ML19322D919 ML19322D921 ML19322D922 ML19322D923 ML19322D924 ML19322D925 ML19322D926 ML19322D927 ML19322D928 ML19322D929 ML19322D930 ML19322D931 ML19322D932 ML19322D933 ML19322D934 ML19322D935
References
NUDOCS 8003110268
Download: ML19322D935 (2)

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February 5, 1980 gi, gi El.!f55 E.5..A..d

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The Honorable John F.

Ahearne g:lgg Acting Chairman

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Dear Mr. Chairman:

As part of~our investigation into the accident at Three Mile Island, we are looking at certain events which in some j;;. ;;gg way may have foreshadowed the March 28, 1979, accident.

l These events include the September 24, 1977, transient at

.3 Davis Besse, the June 13, 1975, transient at Oconee Unit 3, and

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the four previous transients at Three Mile Island Unit 2 in which the high pressure injection system was automatically actuated.

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With regard to these events, it is currently our under-P 1-standing that, following these events, your agency did not in notify other appropriate utilities of the incidents or

.;;s advise them of the corrective actions to be taken in such an event.

Please let us know:

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p First, if our understanding is correct.

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Second, if this understanding is correct, why you chose

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Third, if this is incorrect, what notification and pi.n##6j advice was given and to whom.

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Fourth, what follow-up work was done with respect to

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Please include a description of any analysis that was performed and your conclusions regarding

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the severity of the event.

Fifth, with regard specifically to the activation of HPI at TMI-2, whether you centemplated any actions that

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would reduce the number of actuations of HPI under non-loss-of-coolant accident conditions.

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In addition, TMI-2 experienced chronic problems with Edm the condensate polishing system, beginning with an incident t.:ME*E:

on October 19, 1977 (which appears similar to the problems

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on March 28, 1979) and continuing until the accident.

With

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regard to these problems:

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First, was the NRC informed?

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Second, if so, what follow-up actions were taken?

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Please include documentation.

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the circumstances surrounding the failure to inform.

So that we may have this information for our investi-Eh=d;-

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gation report, which is now in the final stages of prepara-tion, we would appreciate your providing a written reply to

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these questions as soon as possible.

We hope to have our

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first draft by February 22.

Thank you very much for your prompt attention to this

matter, w==4 Sincerely,

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Alan h.

mpson Gary Har

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.4 Ranking Minority Member Chairma f.jgMiifl Subcommittee on Nuclear Subco ittee on Nuclear Regulation Regulatio

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