IR 05000237/1986007
| 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: |
| 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
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Facility Name:
Dresden Station, Unit 2
j Inspection At:
Dresden Site, Morris, IL
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Inspection Conducted: Ma,rch 25, 1986 l
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Inspector-
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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 System.
Results:
No violations or deviations were identified.
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G604100096 G60404 gDR ADOCK 05000237 i
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DETAILS 1.
P_e gons Contacted l
Corrmonwealth Edison CompanyjCECo_)
J. Brunner, Assistant Superintendent, Technical Services i
J. Achterberg, Technical Staff Supervisor
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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.
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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:
Notification to RIII was made Occurrence No. 29
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on January 24, 1986. A written report and safety evaluation was sent to RIII in CECO letter
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86-80, dated February 4, 1986.
Notification to RIII was made on Occurrence No. 30
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January 31, 1986. A written report and safety evaluation was sent to RIII in Ceco letter 86-80, dated February 4,1986.
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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 monitors.
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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 1985.
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 1986.
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During the NRC inspection, drafts of the following documents were
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reviewed:
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Installation Procedure
r Functional Test for Megadac Snubber Monitoring System
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MS Line Snubber Monitoring System
The NRC inspector discussed these draft documents with the Ceco and S&L i
staff and observed the Megadac unit at the assigned location. The NRC l
inspector concluded that the measures taken by the Itcensee were adequate.
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. The.
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inspector summarized the scope and findings of the inspection. The
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inspector also discussed the likely informational content of the
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inspection report with regard.to documents reviewed by the inspector
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during the inspection. The licensee representatives did rot identify any
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l such documents as proprietary.
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