ML19225B557

Submits Info Re 790424 Part 21 Notification of Hazard Determined on 790424:component Cooling Heat Exchangers Joints Deflected Greater than Tolerances Defined in Tech Specs.S&W Piping Installation Joints Are Being Realigned

ML19225B557
Person / Time
Site:	North Anna
Issue date:	04/27/1979
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-79-120-000 NUDOCS 7907250447
Download: ML19225B557 (2)

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Vruarxtr Er.ncrurc Axn Pow en Costmxv R tcirxonn,VinoIN A 20261 April 27, 1979

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Mr. Jones P. Oeilly, Director Serial No. 309 Office of Inspection and Fnforcement P0/FHT:scj U. S. Nuclear Regulatory Connission Docket No. 5C-338 Region II License Nc. NPF-4 101 Marietta Street, Guite 3100 Atlanta, Georgia 30303

Dear Sir:

Under the provisions of the operating license Technical Specifications and/or 10CFR21, NRC Region II was notified on April 24, 1979 that a poten-tial significant deficiency or substantial hazard existed at North Anna Power Station, Unit No, i In acccrdance with the reporting requirements of the above regulations, the following inf;rmation is submitted:

A. Name and address of reporting indiitdual:

C. M. Stallings Virginia Electric and Power Coapany P. O. Box 26666 Richmond, Virginia 23261 B. Facility, activity, and/or component 'if acted:

Service water supply and return headers to the Component Cooling Heat Exchangers, Nerth Anna Fower Station Unit No. 1 C. Name of firm supplying the' component, activity or service:

Stone 2nd Webster, Boston, Massachusetts D. Description of defect, deficiency or failure to comply:

It was discovered by Station Personnel that the twelve rubber ex-pansion joints for the service water side of the Component Cooling Heat Exchangers were deflected greater than the misalignment tolerances

.cecified by the manufacturer. Also discovered was the use of only two restraints on the expansion joints when a minimum of three is required. The cause of this deficiency is under inveuigation and will be reported at a later date.

E. Date of DeteI71 nation of Reportability: April 24, 1979 411 346

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Moixia EucTaic A .o Powrie Coxraxy to Mr. James P. O'Reilly 2 F. Similar components, activities, or services:

There are two Component Cooling licat Exchangers for each unit.

Six of .the twelve af fected joints are on the Unit 2 Component Cooling Heat Exchangers. _

G. Corrective action which has been, or is being, or will be taken, the individual responsible and the length of time to complete the action:

A re-evaluation of the piping installation is being done by Stone & Webster. As each joint is re-evaluated, the~ piping is being realigned'and a new rubber expansion joint installed.

This rework for Unit 1 will he completed prior to startup.

H. Other Information:

Any additional information regarding the above topic will be submitted as a Licensee Event Report.

Should you require further information, please contact this office.

Very truly yours, b db' Af C. M. Stallings Vice President-Power Supply and Production Operations cc: Mr. John'G. Davis, Acting Director (3)

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