ML20040C981

Advises of Inherent Problem W/New Four Wire Emergency Notification Sys Telephone Circuit.To Prevent Lockup, Facility Should Ensure That Second Call Is Not Established within 20-s After Original Call Is Terminated

ML20040C981
Person / Time
Site:	07000734
Issue date:	01/21/1982
From:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:	Wellhouser H GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER
References
NUDOCS 8201290433
Download: ML20040C981 (2)

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M 21 Egj Docket No.70-734 General Atomic Company Q

P. O. Box 81608 c'

San Diego, California 92138 RsCs;pFD

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Attention: Dr. H. N. Wellhouser, Manager MNSS I

Nuclear Material Control Division 9]fg 2

Gentlemen:

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An inherent problem has been discovered with the new (4 wire) Em 1 M Notification System (ENS) telephone circuit. The problem is describe ow along with a simple method of prevention which should be used until telephone engineers complete equipment modifications.

After a call has been established (the originator of the call makes no difference) and terminated on the ENS circuit, the telephone circuit for the facility called will " lock up" if a receiver is picked up at that facility before the circuit light is off. This results in the facility not being able to call out on the ENS circuit and the NRC Headquarters not being able to call the facility. After " lock up" occurs a telephone serviceman will be required to disconnect and reconnect the phone circuit at the Headquarters switchgear.

For example:

The NRC Headquarters calls an operating power reactor plant for daily plant status. The reactor facility answars the call and gives the necessary information, after which, both parties hang up. The facility operator, realizing that he forgot to give some item of information 1

quickly picks up the ENS phone in an effort to catch the NRC Headquarters before Headquarters hangs up their phone. This type of action results in " lock up".

To prevent " lock up" from occurring, the facilities should ensure that a second call is not established within 20 seconds afte,' the original call has terminated.

NRC Headquarters will be monitoring all ENS phone line indicators and will inform the facility when lock up occurs and provide a comercial phone number to use to contact NRC Headquarters.

In addition, the NRC will contact the telephone company and initiate the necessary action to release the " lock up".

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NRC FORM 318 4tO pot NRCM O2dO OFFICIAL RECORD COPY

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General Atomic Company jaf; g 7 Telephone company engineers have found a solution to permanently correct the " lock up" problem.

Until the "fix" can be applied, we will appreciate your cooperation in helping us minimize ENS phone circuit " lock up" so that the integrity of the Emergency Notification System will not be jeopardized.

Sincerely, inclut ritra e' L L KPENCEE R. H. Engelken Regional Administrator bcc:

DMB/ Document Control Desk (RIDS)

Distributed by RV:

State; Resident Inspector; RHE J. L. Crews; G. S. Spencer; H. E. Book; D. M. Sternberg; K. Scown l

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