ML20040C964

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 Has Terminated

ML20040C964
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	01/21/1982
From:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:	Withers B PORTLAND GENERAL ELECTRIC CO.
References
TAC-46275, NUDOCS 8201290415
Download: ML20040C964 (2)

Text

{{#Wiki_filter:- _ _ _ _ _ _ - - _ _ _ _ e.,Je 1' N jr { q y y.- y' y i JAN 211982 Docket No. 50-344 [\\* Portland General Electric Company 121 S. W. Salmon Street p' + Portland, Oregon 97204 } RECEIVED Attention: Mr. Bart D. Withers J-- JAN 2319825 d2 Vice President Nuclear ~ n em emu mm k som max a Gentlemen: W An inherent problem has been discovered with the new (4 wire) en Notification System (ENS) telephone circuit. The problem is descr ed below along with a simple method of prevention which should be used until telephone engineers cocplete 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 operator, realizing that he forgot to give some item of information 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 after the original call has terminated. NRC Headquarters will be monitoring all ENS phone line indicators and will inform the facility when lock up occars and provide a conrnercial 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". Oko!$0oh4 ,g T, / PDR r RE S SPkt B0 K '5"ER' 5EUN f"" "NGLEN' su g " 17[ 782 " '17TI/8'2" 7i /52" f t ' " "$ -32" 2' M5

• aoecM om O FFICI A L R EL.Q_R D CO PY

JAN'21198[ j l 3.;'Partland Gineral:ElectricLCompany 2' q is s . 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 "lockuup" so: that: .the. integrity of the' Emergency. Notification System will-not be jeopardizeda Sincerely, satsMAL !!Erc gr 4 & & W1mca 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. Sternbergj K. Scown t i h w. 4 h =}}