ML20199B309
| ML20199B309 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 06/03/1986 |
| From: | Withers B PORTLAND GENERAL ELECTRIC CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-80-15, IEIN-85-077, IEIN-85-77, NUDOCS 8606170107 | |
| Download: ML20199B309 (2) | |
Text
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Y, esas kg Bart D %thers Vce Presdent June 3, 1986
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Trojan Nuclear Plant
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Docket 50-344 License NPF-1 Mr. John B. Martin Regional Administrator, Region V U.S. Nuclear Regulatory Commission Creekside Oaks Office Park 1450 Maria Lane, Suite 210 Walnut Creek CA 94596-5368
Dear Sir:
Emergency Notification System IE Bulletin 80-15 IE Information Notice 85-77 This letter updates our response to IE'Bulletin 80-15 which now appears to have been in error.
NRC IE Information Notice 85-77, "Possible Loss of Emergency Notification System (ENS) Due to Loss of AC Power", advised licensees that modifications to plant telephone systems may result in a change in the vulnerability of the ENS and other plant telephone systems.
As a result of IE Information Notice 85-77, the ENS telephone equipment power supply was reviewed.
It was found that the ENS telephone equipment uses an ac power cord that is plugged into an ac outlet. The ac outlet was not wired to an uninterruptible power supply (UPS) pcwer source.
It was not known if the equipment had to receive ac power to operate properly.
Therefore, PGE tested the Trojan ENS telephone using simulated loss-of-ac power conditions. The ENS telephone failed to operate when ac power was disconnected. The NRC Operations Center and Resident Inspoctor were immediately notified of the test results. On the day following the test, the ENS telephone equipment power cable was unplugged from the non-UPS supplied outlet and plugged into an electrical outlet supplied from a UPS source.
A modification has been designed to add a designated UPS supplied outlet for the ENS telephone equipment. The modification will include a covered outlet enclosure to prevent inadvertent power plus disconnection. The modification is scheduled to be completed by September 1, 1986. The ENS telephone equipment can not be hardwired into a UPS circuit breaker panel because the telephone company maintenance procedures call for the equipment to be unplugged before work is performed on it.
8606170107 860603 PDR ADOCK 05000344
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~9 patiand ceneralsecniccompany Mr. John B. Martin June 3, 1986 Page 2 IE Bulletin 80-15 "Possible Loss of Emergency Notification System With Loss of offsite Power", required licensees to verify, by direct inspection, that the ENS used onsite power or was powered by the local telephone com-pany. Before responding to the Bulletin, PGE and a Pacific Northwest Bell (PNB) (local telephone company) representative inspected the ENS equipment and concluded at the time that the Trojan ENS was powered from the local telephone company office. The PCE response to IE Bulletin 80-15 included the RMS inspection results and information provided by Pacific Northwest Bell concerning the telephone company emergency power supply (ie, battery, diesel generators, test frequency, etc) for the ENS equipment.
It now appears that the information recetved from PNB was in error and
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therefore, the PCE response to IE Bulletin 80-15 was incorrect.
As noted above, the Trojan ENS telephone equipment is currently powered by an uninterruptible power supply. This action should provide assurance that the ENS will operate during a loss-of-offsite power at the Trojan site.
Sincerely, t
[
- ;Y Bart D. Withers Vice President Nuclear c:
Mr. Lynn Frank, Director State of Oregon Department of Energy l
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