ML18051A525
| ML18051A525 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 08/10/1983 |
| From: | Toner K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML18051A526 | List: |
| References | |
| TASK-07-01.A, TASK-7-1.A, TASK-RR NUDOCS 8308150204 | |
| Download: ML18051A525 (2) | |
Text
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consumers Power company General Offices: 1945 West Parnell Road, Jackson, Ml 49201 * (517) 788-0550 August 10, 1983 Dennis M Crutchfield, Chief Operating Reactor Branch No 5 Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR
- PALISADES PLANT - SEP TOPIC VII-1.A "ISOLATION OF REACTOR PROTECTION SYSTEM FROM NONSAFETY SYSTEMS, INCLUDING QUALIFICATIONS OF ISOLATION DEVICES" -
SUPPLEMENTAL FAILURE ANALYSES This submittal is in response to an NRC staff reviewer's June 20, 1983 verbal request for analyses supplemental to those provided in Consumers Power Company's letter dated May 27, 1983 on Systematic Evaluation Program (SEP) Topic VII-1.A "Isolation of Reactor Protection System from Nonsafety Systems, Including Qualifications of Isolation Devices." The commitments stated in Consumers Power Company's letter dated May 27, 1983 are not altered by this submittal.
Request Consumers Power Company's submittal dated May 27, 1983 identifies Consumers Power Company's plan to install lOOK-ohm isolation resistors as close as possible to the Reactor Protection System (RPS) loop dropping resistors.
The analyses accompanying the referenced submittal address postulated faults occuring near the Fischer and Porter Plant Computer. One of the postulated faults is the inadvertent application of a maximum credible voltage which is assumed to be 15V DC.
Please analyze the effect or credibility of the appli-cation of a 125V DC and 440V AC fault in the cable between the Fischer and Porter Plant Computer and the isolator location.
Response
The application of a 125V DC fault in the cable between the Fischer and Porter Plant Computer and the isolator location is addressed in Enclosure 1, Page 12.
As shown in the Enclosure, the application of this fault has no affect on the safety-related RPS loop.
(The enclosed analysis, EA-83-SR0-005, Rev 1 super-sedes Rev 0 previously submitted as part of Consumers Power Company's letter dated May 27, 1983.)
e3oa1so204 030010 PDR ADOCK 05000255 P
PDR OC0783-0010A-NL02
DMCrutchfield, Chief Palisades Plant SEP TOPIC III-1.A August 10, 1983
- 2 The application of a 440V AC fault in the cable between the Fischer and Porter Plant Computer and the isolator location is not considered a credible event.
As concluded in Enclosure 2, the raceway which carries the signals from the RPS to the Fischer and Porter Plant Computer does not carry cable which is energized at either 440V AC or 480V AC.
It is the opinion of Consumers Power Company that this submittal will serve to resolve any outstanding NRC concern related to the installation of the lOOK-ohm isolation resistors.
Kerry A Toner Senior Licensing Engineer CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades Enclosures OC0783-0010A-NL02