U-600387, Interim Deficiency Rept 55-85-10 Re Broken Rosemount Transmitter Neck Seals & Possible Damaged Hollow Screws on Installed Transmitters.Initially Reported on 851120. Investigation Will Be Completed in 30 Days

Interim Deficiency Rept 55-85-10 Re Broken Rosemount Transmitter Neck Seals & Possible Damaged Hollow Screws on Installed Transmitters.Initially Reported on 851120. Investigation Will Be Completed in 30 Days

ML20137A640
Person / Time
Site:	Clinton
Issue date:	01/02/1986
From:	Hall D ILLINOIS POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
55-85-10, U-600387, NUDOCS 8601140431
Download: ML20137A640 (4)

Text

U-600387 b)IY\

1A.120 L14-86 (01 -02 )-L

/LLINDIS POWER COMPANY g CLINTON POWER STATION. P.O. BOX 678. CLINTON. ILLINOIS 61727 January 2, 1986 Docket No. 50-461 Mr. James G. Keppler Regional Administrator Region III

- U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

Reportable 10CFR50.55(e) Deficiency 55-85-10:

Electric Conductor Seal Assemblies (ECSAs);

Broken Neck Seals and Hollow Screws on Installed Rosemount Transmitters

Dear Mr. Keppler:

On November 20, 1985 Illinois Power Company verbally notified Mr. R. Lerch, U.S. NRC Region III (ref. IP Record of Coordination Y-32509, November 20, 1985) of a potentially reportable condition under the provisions of 10CFR50.55(e) concerning the incorrect installation of ECSAs, broken Rosemount Transmitter neck seals and damaged Rosemount Transmitter termination screws. Illinois Power has reviewed and evaluated the findings associated with this investigation to date and has determined that an extensive engineering evaluation would be required to establish the adequacy of these components to perform their intended safety function if uncorrected. On this basis the issue is considered to be reportable under the provisions of 10CFR50.55(e).

Our investigation of this issue is continuing. This letter represents an interim report in accordance with the requirements of 10CFR50.55(e). Attachment A provides the details of our investigation to date.

8601140431 860102 PDR S ADOCK 05000461 PDR

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t 1 JAN 6 1986

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U-600387  :

1A.120 L14-86( 01- 02)-L We trust that this interim report provides you sufficient background information to perform ^a general assessment of this reportable deficiency and adequately describes our overall approach to resolve this issue.

Sincerely yours, D. . Hall-Vice President RLC/ckc Attachment .

cc: NRC Resident Office Director, Office of I&E, US NRC, Washington, DC 20555 Illinois Department of Nuclear Safety INPO Records Center ,

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- ATTACHMENT A Illinois Power Company Clinton Power Station Docket No. 50-461 Reportable 10CFR50.55(e) Deficiency 55-85-10 Electric Conductor Seal Assemblies (ECSAs);

Broken Neck Seals and Hollow Screws on Installed Rosemount Transmitters Interim Report Statement of Reportable Deficiency / Background Illinois Power Start-up (IPSU) identified deficiencies associated with installed Electric Conductor Seal Assemblies (ECSAs) and Rosemount transmitters on Condition Report (CR)

No. 1-85-10-054 and Nonconforming Material Reports (NCMRs)

Nos. 1-1928 and 1-1929. NCMR-1-1928 identified broken Rosemount transmitter neck seals and possible damaged hollow screws on installed Rosemount transmitters. NCMR-1-1929 identifies the following deficiencies involving ECSAs:

ECSAs installed backwards.

Incorrect'use of'Grafoil tape on Midlock Cap threaIds.

ECSA not connected directly to primary device.

No gap or excessive gap between Midlock Cap and seal body.

Investigation Results/ Corrective Action The backwards installation of ECSAs has been addressed and resolved previously. CAR 262, NCR 34479, NCR 34678 and NCR 35329 document this investigation and resolution.

The use of intermediate conduit fittings between ECSA and primary device was reviewed and verified to be an acceptable design as shown on drawing E05-1200, Sheet 21.

.On November 14, 1985, CAR-267 was initiated to investigate the incorrect use of Grafoil tape on ECSAs, incorrect gap on ECSAs, damaged Rosemount tranrnitter neck seals and damaged hollow screws on Rosemount transmitters. The Corrective Action Plan for CAR-267 calls for the inspection and rework (as necessary) of ECSAs and Rosemount transmitters. As of 12-27-85, 305 ECSAs have been inspected. 27 ECSAs were found with incorrect use of Grafoil tape, 7 ECSAs were found with improper gap, 26 Rosemount transmitters were found with broken neck seals. No additional damaged hollow screws have been found.

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ATTACHMENT A (continued)

Root Cause Our investigation has determined that the root cause associated with the deficient ECSAs was a lack of adherence to Conax Instruction Manual IPS-725 by Baldwin Associates' Craft and QC personnel. All Baldwin Associates Craft and QC personnel involved with the installation and inspection of ECSAs have been retrained.

The root cause associated with the broken neck seals on Rosemount transmitters will be determined after further background information is evaluated.

Safety Implications / Significance The incorrect use of Grafoil tape and the incorrect gap on ECSAs invalidate the ECSA qualification. The broken neck seals and damaged screws on Rosemount transmitters invalidate the Rosemount transmitter qualification.

Extensive engineering evaluation is required to determine the extent of the deficiencies and the ability of those components to performed their required safety function in their presently installed condition. On this basis the issue is considered to be reportable under the provisions of 10CFR50.55(e). It is anticipated that approximately thirty (30) days will be required to complete our investigation and to file a final report on the issue.

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