05000369/LER-1981-079, Forwards LER 81-079/03L-0.Detailed Event Analysis Encl

Forwards LER 81-079/03L-0.Detailed Event Analysis Encl

ML20009G215
Person / Time
Site:	McGuire
Issue date:	06/04/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G216	List: 05000369/LER-1981-079, Forwards LER 81-079/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-079-03, /03L-0:on 810508,during Fuel Loading,Water Found in Sample Line for Noble Gas Activity Monitor.Caused by Improperly Designed Loop Seal on Sample Line.Monitor Repaired & Mods Being Made to Correct Deficiency
References
NUDOCS 8108030436
Download: ML20009G215 (2)

LER-1981-079, Forwards LER 81-079/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981079R00 - NRC Website

text

{{#Wiki_filter:. 1 DUKE POWER COMdA5i OFFICIAL N Y s Powsu Ucimixo 422 Sourn Cucacn STnesT, CnAnwrTE, N. C. 2824a v. LLI AM O. PAR M ER, J R. TcLtewowc Anta 704 '/icr PmE$sotNY June 4, 1981 3,340 3 src.- Pacoverio~ I[f Mr. James P. O'Reilly, Director q ' /j U.S. Nuclear Regulatory Commission Region II s' ( g 101 Marietta Street, Suite 3100 bgL1 s Atlanta, Georgia 30303 j 9_ ' JUL,, y gggie T y poa 22 Re: '!cGuire Nuclear Station Unit 1 (. o s.eppsb locket No. 50-369

Dear Mr. O'Reilly:

-{f Please find attached Reportable Occurrence Report R0-369/81-79. T.;is report concerns the inoperability of the noble gas activity monitor, EMF-33. This incident was considered to be of no significance with respect to the health and safety of the public. Very truly yours, Q / William O. Parker, Jr. RWO:pw Attachment cc: Director Mr. Bill Lavallee Office of Management & Program Analysis Nuclear Safety Analysis Center U.S. Nuclear Regulatory Commission Post Office Box 10412 Washington, D. C. 20555 Palo Alto, CA 94303 Ms. M. J. Graham Resident Inspector - NRC McGuire Nuclear Station [ hl 8108030436 010604 PDR ADOCK 05000369 S PDR

McGUIRE NUCLEAR STATION INCIDENT REPORT Report Number: 81-79 Report Date: June 4, 1981 Occurrence Date: May 8, 1981; 1140 hours Facility: McGuire Unit 1, Cornelius, N. C. Identification of Occurrence: The noble gas activity monitor (EMF-33) on the Condenser Steam Air Ejector (ZJ) System was declared inoperable. Condition Prior to Occurrence: Mode 5, Cold Shutdown. Prior to initial criticality. Description of Occurrence: Water was discovered in the sample line of EMF-33. The Shift Supervisor, therefore, declared the system inoperable. This was e reportable pursuant to Technical Specification 3.3.3.9 and required implem-tation of Action Statement #37 of Table 3.3-13. Apparent Cause: Improper design of loop seal on EMF-33 sample line. Analysis of Occurrence: At 1125 hours on May 8, 1981, a Health Physics technician discovered the presence of water in the sample line of EMF-33. The Shift Super-visor declared the EMF inoperable at 1140 hours and instructed Health Physics to initiate a work request to have the system repaired. The necessary repairs to return it to service were performed. The system was declared operable at 1350 hours on May 8, 1981.

Safety Analysis

Only new, non-irradiated fuel existed in the core at the time of this incident. Sample analysis of the React: r Coolant (NC) and the ZJ Systems confirmed that no radiation levels above bacLground were present. Thus, the safe operation of the plant and the health and safety of the public were not affected by this incident.

Corrective Action

Grab samples were taken and analyzed every eight hours as re-quired by Action Statement #37 of Table 3.3-13. Health Physics initiated a work request to have the system repaired. The sample line was cleaned and the flow switch was adjusted trom 8"w.c. to 2"w.c. in an attempt to reduce the vacuum of the system so that water would not be sucked into the pump. The length of the loop seal is to be moditied to correct this deficiency. }}