ML20024E006
| ML20024E006 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 07/28/1983 |
| From: | Drummond F LOUISIANA POWER & LIGHT CO. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| REF-PT21-83 10CFR-050.55E, 10CFR-50.55E, W3I83-0248, W3I83-248, NUDOCS 8308090018 | |
| Download: ML20024E006 (2) | |
Text
4-s l OUISIANA P O W E R & L i G H T! P O BOX 6008
- NEW OnLEANS. LOUISIANA 70174 242 OeLanONOe stater
- (504) 366-2345 MlOOLE SOUTH uTiuriES SYSTEM July 28, 1983 W3183-0248 Q-3-A35.07.72
, -f_= &
t Mr. John T. Collins, Regional Administrator, Region IV U. S. Nuclear Regulatory Commission tj
.L!0,1 611 Ryan Plaza Drive, Suite 1000 AIS - 31983 1
hg Arlington, Texas 76012 as
SUBJECT:
Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 72
" Radiation Monitoring System RM-23 Control Modules" Final Report
REFERENCE:
LP&L letter W3183-3225 dated July 5, 1983
Dear Mr. Collins:
In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 72,
" Radiation Monitoring System RM-23 Control Modules".
If you have any questions, please advise.
Very truly ours, V **'
F. J. Drummond Project Support Manager - Nuclear Attachment FJD/WAC/ MAL:keh cc:
- 1) Director 3)
Mr. E. L. Blake Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 (w/15 copies)
- 2) Director 4)
Mr. W. M. Stevenson Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D. C.
20555 (w/1 copy)
F308090018 830728 PDR ADOCK 05000382 O
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o-s FINAL REPORT OF SIGNIFICANT CONSTRUCTION = DEFICIENCY NO. 72-
-, - RADIATION MONITORING SYSTEM RM 23 CONTROL MODULES"
~
INTRODUCTION Thisreportissubmittedpursuantto10CFR50.5$(e).. It describes deficiencies
~
which existed in the radiation monitoring system RM-23 modules. This deficiency fis considered reportable under the: requirements of'10CFR50.55(e).
. General Atomic Technologies, Inc. of San Diego, California has informed LP&L-
.that-this problem has been reported to the Nuclear Regulatory Commission. pursuant' cto'10CFR21.
DESCRIPTION GA Technologies Inc.-(the vendor) informed us that1 uring start-up of a GA-d Radiation Monitoring: System at a nuclear' plant, an intermittent lock-up of the RM-23 display was observed. This lock-up apparently causes the " Channel Activity" display to freeze at the most recent activity value for each channel.
~
Initially it was thought that-this condition was an anomaly related to the.
specific castallation. However, as the RM-23 modules are safety related, further studies were conducted, and the results of these studies indicated that a. general-
-design. problem within the RM-23 modules did exist.
SAFETY IMPLICATIONS The main control board alarms for. safety-related radiation monitors are connected to the RM-23 alarm contacts, which are dependent on RM-23 processed data.- These monitors include the containment radiation monitors, the plant--
stack radiation monitors, the Fuel Handling Building radiation monitors, and other post-accident radiation monitors. Without operational RM-23 modules, the
~ control room. audible and visual alarms based on these monitors cannot be 1
i initiated. Although there are safety-related recorders which would provide L
. radiation level information from these monitors as well as other indirect indications of the alarm condition, the primary alarm would be lost-and s
therefore' plant' safety would be affected if this deficiency were left uncorrected.
CORRECTIVE ACTION
-Nonconformance Report W3-5744 was initiated to track and document corrective
. action.
The vendor modified'the RM-23 modules to provide them with more memory capacity which permits computer software changes to eliminate lock-ups.
1 All corrective action.is complete and Ebasco (Engineering and Quality Assurance)
- has reviewed and accepted all the supporting documentation.
This report is submitted as the Final Report.
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