IR 05000237/1985034
| ML17195A996 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 10/30/1985 |
| From: | Danielson D, Yin I NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML17195A995 | List: |
| References | |
| 50-237-85-34, NUDOCS 8511050098 | |
| Download: ML17195A996 (3) | |
Text
U.S. NUCLEAR REGULATORY COMMISSION
REGION III
Report No. 50-237/85034(DRS) *
Docket No. 50-237 License No. OPR-19 Licen~ee: Commonwealth tdison Company Post Office Box 767
- Chicago, Illinois 60690 Facility Name:
Dresden Station, Unit 2 Inspection At:
Dresden Site, Mbrris, Illinois Inspection Conducted:
October 17-18, 1985 Inspector:
Approved By:
.
.
I. T.* Yin D. H. Danielson,* Chief Materials and P~ocesses Section Inspection Summary
/()µ.?jPr Date
v){~oJ.er Date
. Inspection on Ottober 17-18, 1985,(Reeort Nb: 50-237/8~034(D~~)l.
Areas Inseected: * Annouriced, special rnspect1on*. to ~~view ac,t1v1t1es related to the'Marn Steam (MS) -Transient Monitoring *system. * fhe inspection involved a total of 16 inspector-hours onsite and in the NRC *.Region III* 9ffice by one NRC i nspecto.r...
,-
.
_..
.
Results:
No~ vio1ations or deviations were'ddentified...
- DETAILS Persons Contacted Commonwealth Ed1son Company (CECo)
R. W. Stobert, Senior QA Inspector R. A. Flessner, Services Superintend~nt J. W. Wujciga, Production Superintendent J. R. Wojnarowski, Nuclear Licensing Administrator
- J. Achterberg, Technical Staff Supervisor*
M. L. Reed, SNED Engiiie :.
S. E. Kuczynski, Technical Staff Engineer..
C. E. Beck, SNED Engineer
- D. Adam, Compliance Administrator
"""_,..
~...,._ ~.,.. :
. '
. ~
-.
Sargent arid lundyE_rigineer'(S&L.)
-
D. E. Olson, Project E~gineer D. M. McFarland, Senior Engineer Specialist
'.
,.. -.
- Denotes those attending the management exit meeting on October 18, 1985. Review of Strain Gage (SG) Signal Indic~tions
.Since the issuance of RIII Confirmatory Action Letter (CAL) 85-04 on April 5, 1985, there have been 15 SG signal indications observed on the MS transient monitoring syste The inspector's review of ea~lier signal indications were do~umented in RIII Inspection Reports 50-237 /85018 and 50-237 /8502 The inspect.or reviewed the fo 11 owj ng two strain gage (SG) signal strip charts during this inspection:
Occurrence No. ~4
Octurr.ence No: 15.*
Notification to RIII was made on August 21, 198 A written report and safety.evaiuation was*
sent to RIII in CECo letter 85-836, dated August 23, *198 Notifitation to RIII was made on August 28, 198 A written report and safety evaluation was sent to RIII in CECo letter 85-914, ~ated September io, 198 As a result of the.review the inspector concurred with the licensee's conclusion that the MS transient monitoring system trips.were sp~ri6us in nature and were caused by the electrical interference generated from the movement of the source and intermediate range reattor power ~evel monitors.
- -
- Followup on Rill.CAL 85.:.04 In Item 3 of the CAL CECo agreed to modify the MS transient monitorfog system ~o that any one of the six linear variabl~ differential transformers (LVDTs) will activate the system when it ex.ceeds the set leve At the present only SG signals can attivate the syste Prior to the site inspection, CECo 'forwarded the following ~aterial to RIII:
- . Dresden 2 -
Dresden 2 -
MS Line Snubber Monitoring Syste (This material describes the system, and addresses the spurious.trip problems.)
MS Line Snubber Mbnitoting System:
Snubber Displ&cement LVDT Tri~ Limit In addition "to the above, the fo 11 owing materi a 1 was presented to the inspector at the ~ite: *
Dresden 2 -
MS L~ne Snubber Monitoring System:
Megadac Data Acquisition Syst~m~
Upon review of the abov~ ~aterial, the *inspector concurred with the CECo techhical ~valuatio~s and the proposed. upgrade of the monitoring syste The inspector 1 s review of the CE Co presentation *and discussions with the litensee and ~&L technical personnel formed the basis for an~amendment to CAL 85~04. Amendment 1 was issued on October 23, 1985 (Attachment 1).
Exit Interview The Region Ill inspector ~et with litensee_repr~senta~ives (denoted in Paragraph 1) at the tbnclusion of the inspection on October 18, 198 "The inspe~tor summariied the s~ope and findings of the inspection~
The inspect~r also distussed the likely informational. content of the inspection report *,wit~ r_egard to docum.ents *re vi e~ed by the i n_spector during the inspectio The: l_icensee representatives did not identify *
any such doc.uments as proprietar *
3