IR 05000237/1985024
| ML17195A882 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 07/11/1985 |
| From: | Danielson D, Yin I NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML17195A881 | List: |
| References | |
| 50-237-85-24, NUDOCS 8507150423 | |
| Download: ML17195A882 (3) | |
Text
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U. S. NUCLEAR REGULATORY COMMISSION REGION I II Report No.:
50-237/85024(DRS)
Docket No.:
50-237 License No.:
DPR-19 Licensee:
Commonwealth Edison Company Post Office Box 767 Chicago, IL 60690 Facility Name:
Dresden Station, Unit 2 Inspection At:
Dresden Site, Morris, IL Inspection ~
1985 Inspector~. T. Vin Approved By:
D. anielson, Chief Materials and Processes Section Inspection Summary
.
7/11/ Date Inspection on June 21, 1985 (Report No. 50-237/85024(DRSll Areas Inspected: Announced, speciai-lnspection to review activities related to the Main Steam (MS) Transient Monitoring Syste The inspection involved a total of 3 inspector-hours onsite by one NRC inspecto Results No violations or deviations were identified *
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- DETAILS Persons Contacted Commonwealth Edison Company (CECo)
- C. E. Beck, Electrical Engineer, SNED
- G. G. Adams, Engineer, SNED
- W. D. Pierce, Engineer, Dresden Station
- J. Achterberg, Technical Staff Supervisor
- M. Strait, Engineer, SNED Sargent and Lundy Engineers (S&L)
- D. E. Olson, Project Engineer
- Denotes those attending the exit meeting held at the site on June 21, 198.
Licensee Action on Previously Identified In~ection_Findin9~
- (Closed)
Open Item (237/85018-01):
Followup on licensee actions related to inspection of strain gage (SG) instrumentatio Inspections were conducted by CECo and S&L on June 10, 1985, and SG damage due to snubber rod eye and end bracket interference was observe No structural or snubber damage was foun.
Review of SG Signal Indications Since the' issuance of RIII CAL 85-04 there has been six SG signal indications observed on the MS monitoring syste The first three were reviewed by the inspector and determined to be due to signal interferences and SG damag The second three (documented in CECo letter No.85-653 to RIII, dated June 12, 1985) were reviewed at the site during this inspectio The inspector concluded that these indications were all due to electrical and/or electronic interferenc.
Discussion of Future SG Instrumentation Improvements The present SG instrumentation is susceptible to electric power transient
- and electronic signal interference The Vishay signal tonditioner is not compatible with the Gould signal amplifier recorder and printer. During a meeting at the site, CECo stated that one of the following actions will be taken to improve the present instrumentation. This improvement would not affect the RIII CAL 85-04 presribed time limitatio Replace the Gould 2800S syste Replace the Vishay SG signal conditioner with a Gould signal conditioning system in addition to completing Item a. abov Continue using the existing Gould 2800W and 2800S systems with the addition of a digital computer to interpret signals generated by the Vishay signal conditione The interpretation criteria will be provided by S&L and the software will be developed by the Nutherm Compan Replace all existing units with a Megadac data acquisition syste During the meeting, CECo committed to provide Riii with the technical information that is pertinent to any planned signal filtering and control alteration prior to the actual installation of these system.
Exit Interview An exit interview with licensee representatives was conducted on June 21, 1985, to discuss the finding The inspector discussed the likely informational content of the inspection report with regard to documents reviewed by the inspector during the inspectio The licensee did not identify any such documents as proprietar