ML20215G267
| ML20215G267 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/06/1986 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 2NRC-6-104, 86-12, NUDOCS 8610200300 | |
| Download: ML20215G267 (3) | |
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2NRC-6-104 Beenr Vall
- o. 2 Unit Project Organization Telecopy (
3-5 Ext.160 P.O. Box 328 Oct. 6, 1986 Shippingport, P/. 15077 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406
. ATTENTION:
Dr. Thomas E. Murley Administrator
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 Potential Significant Deficiency Report 86-12 Gentlemen:
Tnis Potentially Reportable Significant Deficiency Report is being submitted pursuant to the requirements of 10CFR50.55(e). This is a final report.
No additional reports are anticipated.
DUQUEStiE LIGHT COMPANY By J'. J. 'Carey Sr. Vice President RWF/ijr NR/SDR/8612 Attachment cc:
Mr. P. Tam, Project Manager
- w/ attachment Mr. J. M. Taylor, Director (3)
- w/ attachment Mr. J. Beall, NRC Sr. Resident Inspector
- w/ attachment Mr. L. Prividy, NRC Resident Inspector
- w/ attachment INPO Records Center
- w/ attachment NRC Document Control Desk
- w/ attachment f
8610200300 861006
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'I Beaver Valley Power Station Unit 2 Duquesne Light Compay Design Control of Terminal Block Application 1.
Summary During NRC Inspection 50-412/85-25, the NRC. inspector noted the inst'illation of commercial grade tenninal blocks in locations where the Electrical Installation Specification, 2BVS-931, indicates that nuclear grade terminal blocks'should be used.
2.
Immediate Action Taken Nonconformance and Disposition Report No.16520 was issued, against the junction boxes referenced in Inspection Report 50-412/85-25 and was dispositioned by requiring replacement of the commercial grade tenninal blocks with nuclear grade terminal blocks.
On September 9,1986, Mr. R. J. Wallauer from Duquesne Light Company notified Mr. David Limroth from 11RC Region 'I regarding this potential significant deficiency.
3.
Description of Deficiency On December 2,1985, it was determined that the design philosophy indi-cated in Specification 2BVS-931, Electrical Installation,.was not transl ated into wiring diagram 10080-RE-18EC, Revision 2A, concerning the type of tenninal blocks acceptable for use in the wiring installation for the feedwater isolation valve actuators.
Specifically, 2BVS-931 indicates that nuclear grade terminal blocks (Marathon Type 1500-NUC and 142-NUC) should.be used in the Main Stean Valve House for Category I circuits.
Wiring Diagram 10080-RE-18EC, Revision 2A,. Hydraulic Feedwater Isolation Valves 2FWS*HYV157A,1578, 157C specified the use of commmercial grade Marathon 1500 tenninal blocks. The inspector detennined that a commercial grade Marathon 1512 terminal block was installed in the. junction box (2JB*3603) for 2FWS*HYV157C.
SWEC Engineering reviewed all electrical drawings (RE series) for consistency with Specification 2BVS-931 regarding terminal blocks.
I SWEC Engineering also reviewed the associated Field Construction Procedure (FCP-432, Electrical Tenninations) and SQC Inspection Plan IP-8.5.2, (Scheduled Cable Tennination Acceptance).
The results of this review were that FCP-432 and IP-8.5.2 accurately reflect the requirements of 2BVS-931. However, 26 commercial grade tenninal blocks were shown on RE drawings for use in areas in which nuclear grade tenninal blocks are required.
Of these 26, a visual verification showed that six commercial grade blocks were actually installed.
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The differences between Marathon " Nuclear" and " Commercial" blocks are as follows:
" Nuclear" blocks are made from a proprietary a.
Block Material compound supplied by one manufacturer.
The " Commercial" block materials' are furnished by various suppliers that do not provide the proprietary material.
b.
Bus Bar - The " Nuclear" blocks have thicker bus bars (.090 in.)
vs (0.045 in.) on the " Commercial" blocks.
Additionally, the materials on commercial grade bocks are not traceable and changes in material are not controlled.
4.
Analysis of Safety Implications The commercial grade terminal blocks are not qualified for all possible adverse environments which they may experience during accident con-ditions for the locations they are located.
5.
Corrective Action All affected RE drawings have been revised by issue of E&DCR No.
2P-4829, to show the installation of the nuclear grade tenninal blocks in accordance with 2BVS-931.
Construction will replace any commercial grade terminal blocks previously installed with the nuclear grade ter-minal blocks as required.
To prevent recurrence, Engineering personnel have been informed in writing that all future tenninal blocks for safety-related applications will be shown on RE drawings as nuclear grade regardless of plant location.
6.
Additional Reports This is a final report. No additional reports are anticipated.
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