ML20040B683
| ML20040B683 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 01/19/1982 |
| From: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8201260314 | |
| Download: ML20040B683 (2) | |
Text
.
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l Docket: 50-298
@ l9 1982
/9W
.N Nebraska Public Power District
'J-ATTN:
J. M. Pilant, Director f
s Licensing & Quality Assurance
,w P. O. Box 499 C/
Columbus, Nebraska 68601
/
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 picked up at a facility before the circuit light is off, the telephone 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 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 l'eadquarters switchgear.
For example:
The NRC lleadquarters 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 forgot to give some item of infomation, picks up the ENS quickly, trying to catch the NRC I!eadquarters 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-quarters will be monitoring all ENS phone line indicators and will infom the facility when lock up occurs and provide a comercial phone number to use to contact NRC lleadquarters.
In addition, the NRC will contact the telephone company and initiate the necessary action to release the " lock up."
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IV fiebraska 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,
. by J u:.
_ ;.3 John T. Collins Regional Administrator cc:
L. C. Lessor, Superintendent Cooper Nuclear Station P. O. Box 98 Brownville, fiebraska 68321 bcc:
J. T. Collins, RIV K. V. Seyfrit, RIV C. Hackney, RIV J. Gagliardo, 500, RIV I
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