IR 05000237/1986007

Insp Rept 50-237/86-07 on 860325.No Violations or Deviations Noted.Major Areas Inspected:Activities Re Main Steam Transient Monitoring Sys

ML20155A868
Person / Time
Site:	Dresden
Issue date:	04/04/1986
From:	Danielson D, Yin I NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
Shared Package
ML20155A867	List: IR 05000237/1986007 ML20155A863
References
50-237-86-07, 50-237-86-7, NUDOCS 8604100096
Download: ML20155A868 (3)

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U.S. NUCLEAR REGULATORY COMMISSION

REGION III

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'l Report No. 50-237/86007(DRS)

t Docket No. 50-237 License No. OPR-19

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Licensee: Commonwealth Edison Company Post Office Box 767 Chicago, IL 60690 ,

Facility Name: Dresden Station, Unit 2

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Inspection At: Dresden Site, Morris, IL

! Inspection Conducted: Ma,rch 25, 1986 l @M 4 O i Inspector- . . Yin

) Date Approved By: D. H. Danielson, Chief dd i Materials and Processes Section Date i

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Inspection Summary

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{ Inspection on March 25, 1986 (Report No. 50-237/86007(DRS))

l Areas Inspected: Announced, special inspection to review activities related to the Main Steam (MS) Transient Monitoring Syste Results: No violations or deviations were identifie l

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DETAILS P_e gons Contacted l Corrmonwealth Edison CompanyjCECo_)

J. Brunner, Assistant Superintendent, Technical Services J. Achterberg, Technical Staff Supervisor i

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M. L. Reed, SNED Engineer

• S. E. Kuczynski, Technical Staff Engineer j D. Adam, Regulatory Assurance Staff Sargent and Lundy Engineer (S&L).

D. E. Olson, Project Engineer D. M. McFarland, Senior Engineer Specialist USNRC - RIII

• E. A. Hare, Resident Inspector

• Denotes those attending the management exit meeting on March 25, 1986. l Review of_ Strain Gage (SG) _ Signal Indications

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Since the issuance of RIII Confirmatory Action Letter (CAL) 85-04 on April 5,1985, there have been 34 SG signal indications observed on the MS transient n.onitoring system. The inspector's review of earlier signal indications were documented in RIII Inspection Reports No. 50-237/85018, No. 50-237/85024, and No. 50-237/85034 The inspector reviewed the following two strain gage (SG) signal trip charts during this inspection:

Occurrence No. 29 - Notification to RIII was made on January 24, 1986. A written report and safety evaluation was

.. sent to RIII in CECO letter -

86-80, dated February 4, 198 *

Occurrence No. 30 - Notification to RIII was made on January 31, 1986. A written report and safety evaluation was sent to RIII in Ceco letter 86-80, dated February 4,198 .

As a result of the review the inspector concurred with the licensee's conclusion that the MS transient rronitoring system trips were spurious  ;

in nature and were caused by the electrical interference generated from the movement of the source and intermediate range reactor power level monitor .

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3. Rep,la_ cement of the_ Existing,N_onitoring_Sy_stfm_ wj_th__t_h_e Mega_dac System j

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S&L engineers were assigned the responsibility to replace the present ;

Gould monitoring system with a Megadac system. The Megadac unit was received on November 1,1985, and S&L engineers became familiar with I operation of the system ant verified system functicrability during i November and December 198 In January 1986 S&L engineers returned l the unit to Optim, the manufacturer, for some reconfiguration. Trial l installation of the !bgadac unit using one LVDT and one SG installed l on the MS monitoring system was accomplished during February 198 [

During the NRC inspection, drafts of the following documents were ,

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Installation Procedure r

• Functional Test for Megadac Snubber Monitoring System

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• MS Line Snubber Monitoring System  ;

i The NRC inspector discussed these draft documents with the Ceco and S&L staff and observed the Megadac unit at the assigned location. The NRC l inspector concluded that the measures taken by the Itcensee were adequat ;

4. Exit Interview i

The Region III inspector met with licensee representatives (denoted in l Paragraph 1) at the conclusion of the inspection on March 25, 1986. Th !

inspector summarized the scope and findings of the inspection. The ,

inspector also discussed the likely informational content of the >

inspection report with regard.to documents reviewed by the inspector ,

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during the inspection. The licensee representatives did rot identify any [

l such documents as proprietar l l

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