ML20108B638

Part 21 Rept Re Defect in Velan Swing Check Valves Causing Valve Disc to Improperly Align W/Valve Seat.All Four High Pressure Injection Swing Check Valves Will Be Disassembled During Refueling Outage & Valve Internals Modified

ML20108B638
Person / Time
Site:	Davis Besse
Issue date:	11/01/1984
From:	Crouse R TOLEDO EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-84-534-000 1-477, IEIN-83-06, IEIN-83-6, PT21-84-534, PT21-84-534-000, NUDOCS 8411160131
Download: ML20108B638 (5)

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" -Docket No. 50-346 roteco IEE3lEiC)fW License No. NPF-3 '

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Mr. James G. Keppler, Regional Administrator United States Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137

Subject:

10 CFR Part 21 Report, Interference in Velan Swing Check Valves

Dear Mr. Keppler:

This letter is to serve as a notification of a 10 CFR Part 21 defect which was identified by the Toledo Edison Company on October 29, 1984. This letter confirms a conversation between your Mr. Nick Jackiw and Toledo Edison's Messrs. Stan Batch and Robert Peters on October 29, 1984.

Toledo Edison had decided to inspect the high pressure injection swing check valves during the 1984 refueling outage based on concerns in NRC IE Notice 83-06, INPO SER 20-83, and correspondence from Velan, the valve manufacturer.

On October 25, 1984 Valve HP59 was disassembled and inspected. It was discovered that the disc could be spun with sufficient force by hand to cause the anti-rotation stop on the hanger arm to bind on a disc stop (See Figure 1.) If the disc were to spin into this position during normal oper-ation, the valve disc could be prevented from properly aligning with the valve seat and some back leakage could occur.

This is the same mode of failure identified at Beaver Valley, however the root cause here appears to be a defective originally supplied component, instead of a problem with spare parts, as was identified in NRC IE Notice 83-06. The valve identified with this deficiency is a Velan Model B9-3114B-13WS, Serial No. 285, 2h" swing check valve.

Although the generic applicability of this problem has not yet been fully assessed, Toledo Edison has decided to provide this information to the NRC 1 to assure early notification of a manufacturing defect per 10 CFR Part 21.

9411160131 841101 gDRADOCK 050003gg NOV 5 E04 THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO, OHIO 43652

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x A Docket.N3. 50-346 License No. NPF-3 Serial No. 1-477

. November 1, 1984 Page 2 Davis-Besse Unit 1 presently has its fuel removed from the reactor vessel for the inspection of the reactor internals. .All-four of the high pres-sure injection swing check valves will be disassembled during the refueling -

outage and the valve internals modified to eliminate this problem. The modification involves locking the dice with a pin through the arm to pre- .

vent disc rotation, which would prevent the anti-rotation stops from binding. (See Figures 2 & 3)

The ' binding of the disc on the high pressure injection valves does not prevent the High Pressure Injection System from performing its intended function of supplying water to the reactor coolant system. The binding could prevent the disc from seating properly and allow some back leakage to occur. Since at Davis-Besse a stop check valve and a closed motor operated valve are in series with each high pressure injection swing check valve, leakage through the swing check valve would not affect the operation of the system or result in any overpressurization of the piping as occurred at Beaver Valley.

This report satisfies the requirement for written notification within five (5) days of. determination of a defect. Additional information will be provided'in a 30 day Licensee Event Report (LER), which will be provided per 10 CFR 50.73 Very truly yours, R P W /rvn RPC:SNB:bec/nif cc: DB-1 NRC Resident Inspector e

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