ML19323H724
| ML19323H724 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 06/09/1980 |
| From: | MISSISSIPPI POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19323H723 | List: |
| References | |
| NUDOCS 8006160106 | |
| Download: ML19323H724 (1) | |
Text
Attachment to AECM-80/125 7
Page 1 of n
(v)
INTERIM REPORT #2, PRD-80/03 I.
Background and Description of Deficiency on February 28, 1980, Mississippi Power 5 Light Company notified Mr. M. J. Gouge of your of fice of a deficiency concerning damaged instrumentation cables under the Reactor Pressure Vessel (RPV).
Mr. Gouge was notified at that time of our determination that this matter was not reportable within the meaning of 10CFR50.55(e).
This notification was made for information purposes only. On March 6, 1980, Mr. Couge informed Mississippi Power 5 Light Company that this deficiency should be considered and processed as a re-portable condition.
Soc.e 132 cables located under the Unit 1 Reactor Pressure Vessel were damaged during the installation of control red drive assembly housings. Damaged cables pertain to the Control Rod Drive Hydrau-lic System and Neutron Monitoring System. The damage ranges from pinched insulation to insulation cut through to the conductor.
This is documented in several Bechtel Nonconformance Reports (NCR) and Condition Reports (CR) and filed under Bechtel MCAR-GGNS No. 62.
Several factors contributed to the occurrence of this deficiency.
Primarily the working area under the RPV is quite restricted.
Be-cause of this aspect instrumentation cables were installed Orior to the installation of the control rod drive housings. We have determined that during the CRD housing installations, adequate measures were not taken to protect the previously installed cables.
II.
Safety Implications Some of the damaged instrumentation cables are associated with safety related equipment, and as such, could have adversely af-fected the safety of plant operations at Unit 1.
This deficiency is thus reportable under iCCFR50.55(e).
III.
Corrective Actions The repair or replacement of damaged cables has been comoleted for Unit 1.
Ti.e inspection and evaluatien of this corrective action is in progress.
We are currently in the process of determining a suitable means for preventing the recurrence of this deficiency in the ins talla t ion of cables in Unit 2.
This determination will be provided in our final report on this matter.
$e 8 0 0 616 OlD le 55
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