ML20040B498

Advises of Inherent Problem W/New (4-wire) Emergency Notification Sys Telephone Circuit.Method of Prevention Described Should Be Used Until Telephone Engineers Complete Equipment Mods

ML20040B498
Person / Time
Site:	Arkansas Nuclear
Issue date:	01/19/1982
From:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:	Cavanaugh W ARKANSAS POWER & LIGHT CO.
References
NUDOCS 8201260119
Download: ML20040B498 (2)

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Arkansas Power and Light Company ATTN: Mr. William Cavanaugh III

,j Senior Vice president

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Energy Supply

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P. O. Box 551 Little Rock, Arkansas 72203 Gentlemen:

An inherent problem has been discovered with the new (4 wire) Emergency Notification System (ENS) telephone circuit. The problem is described here 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, if a receiver is pickeo up at a facility before the circuit light is off, the telephor.e circuit for that facility will " lock up."

This results in the facility not being able to call out on the ENS circuit and the NRC lieadquarters rot t'uing able te call the facility. After " lock up" occurs a telephone serviceman will be required to disconnect and reconnect the phone circuit at the Headquarters switchgear.

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For example:

The NRC Headquarters calls an operating power reactor for daily plant status. The reactor facility answers the call and gives the necessary information, after which, both parties hang up. The facility, realizing that he fo.got to give some item of information, picks up the ENS quickly, trying 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 after the original call. NRC Head-qtnrters will be monitoring all ENS phone line indicators and will inform the fecility when lock up occurs and provide a comercial phone number to use to contact NRC Headquarters.

In addition, the NRC will contact the tele,7 hone company and initiate the necessary action to release the " lock up."

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OFFICIAL RECORD COPY

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Arkansas Power and Light Company 2

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Telephone campany engineers have fot.nd a solution to permanently correct the " lock up" problem. Until the "fix" can be applied, we appreciate j our cooperation in helping us minimize tha phone circuits being " locked up" j

and therefore maintaining the integrity of the Emergency Notification System.

Sincerely,

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John T. Collins Regional Administrator cc:

James P. O'llanlon, Plant Manager Arkansas Nuclear One P. O. Box 608 Russellville, Arkansas 72801 bcc:

J. T. Collins, RIV K. V. Seyfrit, RIV i

C. Hackney, RIV I

J. Gagliardo, 500, RIV I

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