ML20096F437

Second Interim Deficiency Rept Re Flexible Conduits Extensions Not Meeting Thermal Criterion for Length. Initially Reported on 840112.Evaluation Still in Progress. Next Rept Will Be Submitted by 841214

ML20096F437
Person / Time
Site:	Bellefonte
Issue date:	08/10/1984
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8409100009
Download: ML20096F437 (2)

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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA TENNESSEE 374of 400 Chestnut Street Tower II I

8tl AUG44us't 116,344 BLRD-50-438/84-06 BLRD-50-439/84-05 U.S. Nuclear Regulatory Commission Region II Attn:

Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323

Dear Mr. O'Reilly:

BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - LENGTHS OF FLEX CONDUIT EXTENSIONS NOT AS SPECIFIED - BLRD-50-438/84-06, BLRD-50-439/84 SECOND INTERIM REPORT The subject deficiency was initially reported. to NRC-0IE Inspector P. E. Fredrickson on January 12, 1984 in accordance with 10 CFR 50.55(e) as NCR 2707. This was followed by our interim report dated February 7,1984.-

Enclosed is our second interim report. We expect to submit our. next report -

by December 14, 1984.

If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.

Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, nager Nuclear Licensing Encloeure cc:

Mr. Richard C. DeYoung, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.

20555 Records Center (Enclosure)

Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 84092000o9 840s gDRADOCM05000h8 PDR OF'FICIAL col'Y i

An Equal Opportunity Employer pi g

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ENCLOSURE i

e, o BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2

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LENGTHS OF FLEX CONDUIT EXTENSIONS NOT AS SPECIFIED BLRD-50-438/84-06, BLRD-50-439/84-05 NCR 2707 10 CFR 50.55(e)

-SECOND INTERIM REPORT Description of Deficiency Flexible conduit extensions of the following conduit do not meet the thermal criterion for length:

Existing Flexible Minimum Specified Conduit Size Conduit Extension Extension ID (inches)

Length Exposed (inches)

Length (inches) 1R4-1959-B 1-1/2 25.5 32 1R3-1961-B 1-1/2 27 32 1R3-1962-B 1-1/2 24 32 1R3-1964-B 1-1/2 25 32 1R3-1965-B 1-1/2 21 24 1R3-1341-B 0.75 22.75 24 General construction specification G-40, " Installing Electrical Conduit Systems and Conduit Boxes," revision 5, section 3.2.6.3, " Thermal Movement Consideration," specifies that, where flexible conduit is to be connected to items which are part of a mechanical system designed for thermal movement, it should be used to compensate for any expansion and contraction.

The apparent cause of this deficiency was failure to specify that the thermal movement consideration should be applied to these assemblies.

Interim Progress TVA's Division of Engineering Design (EN DES) is still in the process of providing all necessary criteria and other pertinent information to allow for -

the proper installation and inspection of flexible conduit assemblies on mechanical systems designed for thermal movement.

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