ML20040C973
| ML20040C973 | |
| Person / Time | |
|---|---|
| Site: | 07000025 |
| Issue date: | 01/21/1982 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Remely M ROCKWELL INTERNATIONAL CORP. |
| References | |
| NUDOCS 8201290424 | |
| Download: ML20040C973 (2) | |
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JAN 211982 Docket No. 70-25 Energy Systems Group Rockwell International Corporation m
9 P. O. Box 309 G
Canoga Park, California 91304 0
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RECEIVED
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JAN 281982> h Attention: Dr. M. E. Remley, Manager Health Services and Radiation Safety f
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- Gentlemen:
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9 An inherent problem has been discovered with the new (4 wire) E g
NotificationSystem(ENS)telephonecircuit. The problem is descr d bdi along with a sigle method of prevention which should be used until te ep one 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 answers the call and gives the necessary information, after which, both parties hang up. The facility I
operator, realizing that he forgot to give some item of information
' ogg quickly picks up the ENS phone in an effort to catch the NRC Headquarters zo before Headquarters hangs up their phone. This type of action results
>E in " lock up".
88 To prevent " lock up" from occurring, the facilities should ensure that a n *-
3 second call is not established within 20 seconds after the original call S
has tenninated. 'NRC Headquarters will be monitoring all ENS phone line om indicators and will inform the facility when lock up occurs and provide
,@[u a commercial phone number to use to contact PRC Headquarters. In addition, N
the NRC will contact the telephone company and initiate the necessary action m
to release the " lock up".
I Telephone company engineers have found a solution to permanently correct
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the " lock up" problem. Until the "fix" can be applied, we will appreciate
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Energy Systems Group -
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your cooperation in helping us minimize ENS'phoneicircuit " lock up" so that
-the. integrity of the Emergency Notification System will' not be jeopardized.-
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Sincerely, esistRAL SIC R D ff t t snucts R. H..Engelken Regional Administrator bcc: DMB/ Document Control. Desk (RIDS)
I-Distributed by RV:
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State; Resident' Inspector;-RHE J. L. Crews; G. S. Spencer; H. E. Book; D. M. Sternberg; K. Scown i
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