ML19344A045

Forwards LER#78-002/01T-0

ML19344A045
Person / Time
Site:	Arkansas Nuclear
Issue date:	09/28/1978
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19344A046	List: ML19344A045 ML19344A047
References
2-098-18, 2-98-18, NUDOCS 7810110137
Download: ML19344A045 (1)

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THIS DOCUMENT CONTAINS POOR QUAUTY PAGES l

ARKANSAS POWER & LIGHT COMPANY POST Of nCE BOX 551 UTTLE ROCK. ARKMJSAS 72203 (501)371-4000 September 28, 1978 2-098-18 i

Mr. K. V. Seyf rit, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011

Subject:

Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 Reportable Occurrence Report No. 50-368/78-02 (File: 2-0520) ,_

Gentlemen:

In accordance with Arkansas Nuclear One - Unit 2 Technical Specification 6.9.1.8.e, we have attached the subject report concerning a design problem with seven (7) 4 inch gate valves.

Very truly yours, Daniel H. Williams Manager, Licensing DifW: CSP:mh Attachment cc: Mr. W. D, MacDonald, Director Office of Managerrent Information and Program Control U. S. Nuclear Regulatory Commission Washingto.n, D. C. 20555 Dr. E. Volgenau, Director Office of Inspection T Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 7P/e / / g / 37 MEMET H P/tDDLE E. CUT H UTsLITIEC SYSTE M

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1. Reportable Occurrence Report No. 50-368/78-02

2. Report Date: September 28, 1978 3. Occurrence Date: September 21, 1978

4. Facility: Arkansas Nuclear One - Unit 2 Russellville, Arkansas 72801

- 5. Identification of Occurrence:

On September 21, 1978, a desig: problem with Nuclear Valve Division (Borg Warner) 4 inch, 1500 lb , Carbon Steel Cate Valves was identified.

Five (5) of these valves are ins *alled in the plant. Two (2) valves are spares. Tag numbers for the installed valves are: 2EFW-11A,

2EFW-11B, 2EFW-5B, 2SGS-14A, and 2SGS-14B.

j 6. Conditions Prior to Occurrence:

Steady-State Power Reactor Power 0 MWth i

Hot Standby Net Output 0 MWe j- Cold Shutdown X Percent of Full Power 0  %

Refueling Shutdown Load Changes During Routine Power Operation 0 Routine Startup Operation

, Routine Shutdown Operation Other (specify)

7. Description of Occurrence:

l The problem is a potential for mechanical interference between the valve gate and the gate guide which could prevent complete closure of these manual valves.

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Reportable Occurrence Report No. 50-368/78-02

8. Designation of Apparent Cpuse of Occurrence:

Design X Procedure Manufacture Unusual Service Condition Including Environmental Installation /

Construction Component Failure (See Failure Data)

Operator Other (specify)

9. Analysis of Occurrence:

The problem was discovered during preoperational tests. Since ANO-2 has not been critical there is not a rcdiation hazard nor decay heat to be removed. The health and safety of the general public was not endangered.

Reportable Occurrence Report No. 50-368/78-02

10. Corrective Action:

The valves have been returned to the manufacturer for repair.

Corrective action appears to consist of either building up the valve gate or the gate guide at the point of interference to preclude binding.

11. Failure Data:

- Valve Division (Borg Warner) 4 inch,1500 lb. Carbon Steel

. valve.

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