ML20108E558
| ML20108E558 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 02/18/1985 |
| From: | Dale L MISSISSIPPI POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 84-37-1, AECM-85-0050, AECM-85-50, NUDOCS 8503120229 | |
| Download: ML20108E558 (2) | |
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MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 18 4 0, J AC K S O N. MIS SIS SIP PI 3 9 2 0 5 35 FES22 e gbgry 18, 1985 NUCLE AR LICEN$1NG & $AFETY DEPARTMENT U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30323 Attention:
Dr. J. Nelson Grace, Regional Administrator
Dear Dr. Grace:
SUBJECT:
Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 File:
0260/L-835.0 Special Report 84-37/1, Update Report, Inoperability of the Loose Parts Detection System AECM-85/0050 On November 29, 1984, the Loose Parts Detection System had been declared inoperable for 30 days reaching the 30 day Limiting Condition for Operation (LCO) time limit of Technical Specification 3.3.7.10.
The system was declared inoperable at approximately 19 percent reactor power during startup testing when a high alarm sealed in with no loose parts present. When reactor power was raised above 25 percent the alarms cleared.
Further investigation revealed the alarms to be most susceptible to changing plant conditions below 25 percent reactor power when the background noise level is greatest. This problem has not been experienced at higher power operation. The Loose Parts Monitoring System is considered to be operable and the Alarm Reponse Instruction is being revised to instruct operators in the appropriate actions to take if an alarm is received.
This Special Report is submitted as an update to AECM-84/0529 dated December 10, 1984 Yours truly, L. F. Dale Director
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Mr. R. B. McGehee Mr. N. S. Reynolds Mr. G. B. Taylor
-Mr. Richard C. DeYoung, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C.
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