ML20079N512

Final Deficiency Rept Re Delaval Problem W/Starting Air Valve Assembly on Standby Diesels.Initially Reported on 821201.Capscrews Replaced Per Approved Procedure & Drawings Revised to Reflect Shorter Length

ML20079N512
Person / Time
Site:	Bellefonte, 05000000, Hartsville
Issue date:	01/23/1984
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8401300246
Download: ML20079N512 (2)

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.-Q h TENNESSEE VALLEY AUTHORITY

, , CHATTANOOGA, TENNESSEE 374ot 400 Chestnut Street Tower II

' 'I ?.5 dUJanuary 23, 1984 HTRD-50-518/82-24 HTRD-50-520/82-24 BLRD-50-438/82-82 BLRD-50-439/82-73 U.S. Nuclear Regulatory Commission Region II Attn: Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

HAPTSVILLE PLANT A AND BELLEFONTE NUCLEAR PLANTS UNITS 1 AND 2 - DELAVAL PROBLEM WITH STARTING AIR VALVE ASSEMBLY ON STANDBY DIESELS -

HTRD-50-518/82-24, HTRD-50-520/82-24, BT.RD-50-438/82-82, BLRD-50-439/82 FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on December 1,1982 in accordance with 10 CFR 50.55(e) as NCRs HTA MEB 8202 and BLN MEB 8207. This was followed by our interim reports dated December 30, 1982 and April 8,1983 Enclosed is our final report. TVA has elected to defer construction activities on Hartsville.

Deferral does not mean that the project will be cancelled but that 77A is minimizing its expenditures and construction efforts until such time that TVA has sufficient information to indicate whether the project should be completed or cancelled. Therefore, we will not be submitting further information on Hartsville until a final decision is made regarding this project. We consider 10 CFR Part 21 applicable to this deficiency. ,

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, Manager Nuclear Licensing Enclosure cc: Mr. Richard C. DcYoung, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Records Center (Enclosure) OFFICIAL COPY Institute of Nuclear Power Operations 1103 Circle 75 Parkway, Suite 1500 gh7 Atlanta, Georgia 30339 8401300246 840123 g\

PDR ADOCK 05000438. An Equal Opportunity Employer (

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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 DELAVAL PROBLEM WITH STARTING AIR VALVE ASSEMBLY ON STANDBY DIESELS NCR BLN MEB 8207 10 CFR 50.55(e)

BLRD-50-438/82-82, BLRD-50-439/82-73 FINAL REPORT -

l Description of Deficiency There exists a potential problem with the starting air valve assemblies for TVA's standby diesel generators at Bellefonte Nuclear Plant. The standby diesel generators were manufactured by Transamerica Delavel, Inc. (TDI), of Oakland, California. The starting air valve assembly was manufactured and installed in the cylinder head by TDI. TDI has notified the NRC of this defect under 10 CFR 21 by letter dated May 13, 1982 from R. E. Boyer, Manager, Quality Assurance to the Director of the Office of Inspection and Enforcement.

The potential defect is related to the length of the capscrew which holds the starting air valve assembly in the cylinder head. If all dimension tolerance is stacked in one direction, the installed clearance is les.- than desirable. If. t'11s capscrew bottoms in the tapped hole in the cylinder head before the assembly is properly seated, the torque wrench reading would be misleading and the assembly would be too loose and could possibly fail.

TDI was requested to investigate this problem and supply a root cause of the deficiency. TDI has refused to do so.

Safety Implications Failure of the starting air valve assembly could result in nonavail-ability of the standby diesel generators. In the event of an accident, this condition would adversely affect safe plant operations.

Corrective Action TVA has replaced the capscrews on the starting air valve assemblies per an approved procedure and a revised drawing provided by TDI which reflects the new shorter length of the capscrew. The torque value of the capscrew need not be changed. The use of the shorter capscrew length will ensure that the clearance is desirable, and that the capscrew will not bottom in the tapped hole.

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- Although TDI was reqursted to supply TVA with totion required to -

prevent recurrenca, they refus;d to do to in their letter dated ,

December 2,1982 from Richard Cooke to TVA. TVA has made every effort .

to ensure that all items procured from this vendor do not have the subject deficiency. Furthermore, TVA will place a note in the vendor files which prohibits TVA from procuring any more diesel generators from this vendor without verifying that this problem has been corrected.

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