ML19322C490

Requests That Info Re Beznau Facility Incident Be Forwarded. Also Requests to Be Informed of Status & Eventual Resolution

ML19322C490
Person / Time
Site:	05000273, Crane
Issue date:	07/24/1979
From:	Deyoung R NRC - NRC THREE MILE ISLAND TASK FORCE
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML19322C480	List: ML19322C479 ML19322C485 ML19322C490
References
TASK-TF, TASK-TMR NUDOCS 8001170818
Download: ML19322C490 (2)

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MEMORANDUM FOR:

Harold R. Denton, Director, Office of Nuclear Reactor Regulation 45 )'

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FROM:

Richard DeYoung, Deputy Staff Director

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SUBJECT:

HRC/TMI Special Inquiry Group h

PRECURSOR EVENT IN A FOREIGN REACTOR i

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We understand that in 1974 a small LOCA occurred at a foreign reactor that is very similar to the TMI incident, incident steam fonned in the RCS hot leg causinDuring the course of the i

rise while RCS pressure continued to decrease. g pressurizer level to This void fonnation coolant was still being released from the system. caused pressu The protective system in this design, which is similar to any U.S. reactors, required low pressurizer level and low RCS pressure for safety injection to be auto,atically initiated.

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signals and increasing pressurizer level caused the failure of safety injection to initiate while a small LOCA was occurring.

U.S. reactors have the same coincident logic for initiating safetySince many injection, they are susceptible to the same problem.

the ECCS system could be deceived by this transient and its effect onIn additio pressurizer level, then operators of plants with other designs could have been confused by the pressurizer level indication that resulted from this transient.

Despite the significance and relevance of this incident to U.S. reactors to our knowledge this incident has never been reported to the NRC by the vendor involved.

Act of 1974 require the reporting of defects and noncomp We understand that individuals subject to Part 21 need to report failures hazard in facilities and activities in the United Statesor defects insights resulting from the TMI accident, it would appear that thisBased on the b

incident should have been reported by the vendor following the TMI accident

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We request that all relevant informtion currently available to NRR con-cerning this event be forwarded to us as soon as possible.

should include as a minimum?

This information

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July 24.1979 A description of who within the lIRC became aware of this 1.

event, by wtr t rneans was knowledge.of this event fonrally or informally received by the tiRC, and when was knowledge of the event acquired.

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A discussion of the basis for any decisions that have been r.ade concerning the safety significance of this event and its applicability to domestic reactors.

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A discussion of the regulatory requirements associated with

. the reporting of this event to the liRC by the vendor both

'after and prior to the TfiI accident.

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A discussion of the basis for any decisions to release to the public information associated with this event.

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We request that we be kept informed of the status and eventual resolution of this matter.

Richard DeYoung Deputy Staff Director tiRC/TMI Special Inquiry Group DISTRIBUTION I

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