ML20040B502
| ML20040B502 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 01/19/1982 |
| From: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | William Jones OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8201260123 | |
| Download: ML20040B502 (2) | |
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Omaha Public Power District I
ATTN:
W. C. Jones, Division t'anager -
Production Operations 1623 Harney Street Omaha, Nebraska 68102 Ger lemen:
An inherent problem has been disccvered with the new (4 wire) Emergency flotification System (ENS) telephone circuit. The problen 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 n.akes no difference) and terminated on the ENS circuit, if a receiver is picked 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 V9C lleadquarters 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 for daily plant status. The reactor facility answers the call and gives the necessary infonnation, after which, both parties hang up. The fact'lity, realizing that he forgot 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 shouid casure that a second call is not established within 20 secondi after the original call. tiRC Head-quarters 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 flRC Headquarters.
In addition, the NRC will contact the telephone company and initiate the necessary action to release the " lock up."
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Ow ha Public Power District 2
Telephone company engineers have found a solution to permanently correct the " lock up" problem. Until the "fix" can be applied, we appreciate your cooperation in helping us minimize the phone circuits being " locked up" and therefore maintaining the integrity of the Emergency Notification System.
Sincerely, John T. Collins Regional Administrator cc:
S. C. Stevens, Manager Fori Calnoun Station P. O. Box 399 L
j Fort Calhoun, Nebraska 68102 bec.
l J. T. Collins, RIV 1
K. V. Seyfrit, RIV C. Hackney, RIV j
J. Gagliardo, 5D0, RIV i
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