ML20141A088

Part 21 Rept Re Potential Defect in Contact Block Kits Supplied by Namco Controls.Initially Reported on 860227. Defective Kits Replaced.Vendor QA Program Under Reevaluation

ML20141A088
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	03/28/1986
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
REF-PT21-86, REF-PT21-86-126-000 FVY-86-28, PT21-86-126, PT21-86-126-000, NUDOCS 8604040383
Download: ML20141A088 (4)

Text

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o VERMONT YANKEE NUCLEAR POWER CORPORATION FVY 86-28

. RD 5, Box 169. Ferry Road, Brattleboro, VT 05301 ,my yg ENGINEERING OFFICE

_ 1671 WORCESTER ROAD

. FRAMINGH AM, MASSACHUSETTS 01701

. TEL E PHONE 617 612-8100 March-28, 1986 U.S. Nuclear Regulatory Commission Office of Inspection & Enforcement Region I 631 Park Avenue King of Prussia, PA 19406 Attention: Dr. Thomas E. Murley Regional Administrator

Reference:

a) License No. DPR-28 (Docket No. 50-271)

Subject:

Notification of Potential Existence of a Defect in Accordance with 10CFR21.21 In accordance with the provisions of 10CFR Part 21, Section 21, we are hereby notifying you that we have obtained information indicating that a defect may exist with respect to contact block kits supplied by Namco Controls.

Enclosure I to this letter documents the details of this r.utification.

l Should you have any question regarding this matter, please contact us.

l l Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION WfN*"f WarrenP.Nurphyf I l Vice President and )

Manager of Operations 40gh $ 1

) l p

.i VERMONT YANKEE NUCLEAR POWER CORPORATION U.S. Nuclear Regulatory- -

June'19, 1985 Page 2 cc: (3) U.S. Nuclear Regulatory Commission Director, Office of Inspection & Enforcement

, Washington, D.C. 20555 (3) Chairman, Vermont Yankee. Nuclear Safety Audit and Review Committee (1) Manager, Operational Quality Assurance Dept.

Yankee Atomic Electric Company (1) Institute of Nuclear Power Operations (INPO)

(1) Namco Controls 7567 Tyler Road Mentor, Ohio 44060

\

ENCLOSURE I Namco Contact Block Kit Part 21,1 Report COMPANY INFORMING Vermont Yankee Nuclear Power Corporation i THE COPHISSION RD #5, Box 169 Ferry Road Brattleboro, VT 05301 FACILITY Vermont Yankee Nuclear Power Station PO Box 157 Governor Hunt Road Vernon, Vermont 05354 FIRM SUPPLYING Namco Controls Division COMPONENT 7567 Tyler Blvd.

Mentor, Ohio 44060 NATURE OF DEFECT During rebuilding of Main Stream Isolation Valve (MSIV)

Switches, Vermont Yankee I&C personnel discovered broken /

chipped contact block kits issued from Vermont Yankee stores for use on the job. Work was halted and an inspec-tion was performed on all contact block kits ordered under the same Purchase Order (No. 20145 from Namco Controls).

Original receipt inspection for this Purchase Order had been performed on a sampling basis with no defects noted.

The subsequent 100% inspection performed resulted in 15 of the 35 contact block kits having defects. Some of the contact block kits inspected and' found to be defective during this later inspection were still in facMry sealed packaging, with no broken pieces being found the packaging. From this, it can be concluded that damaged parts were packaged and shipped by the vendor.

At Vermont Yankee these contact block kits were being used to rebuild safety class limit switches on MSIVs. Each i MSIVs is provided with four Namco limit switches. Two of the switches provide an input to the Reactor Protection System (RPS) SCRAM function, and the other two provide valve position indication required to be Category I qualified per Regulatory Guide 1.97. In addition, similar contact block kits are required to rebuild safety class limit switches on turbine stop valves which also provide inputs to the RPS SCRAM function.

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e. h Since defective contact block kits were discovered before installation and since VY was shutdown at the time of discovery, a safety hazard did not exist and no safety limits were exceeded. Although no testing was performed to determine whether or not the damage to the contact blocks would cause them to fail to operate, it is possible that the installation of defective contact block kits could have resulted in a failure of RPS trip inputs and a lack of position indication on certain safety-related valves. This could have.resulted in a failure of RPS SCRAM when required and a Technical Specific,ation violation.

The most probable cause of the damage to the contact block kits was rough handling before packaging. Contact block kits which'have been inspected and determined to be free of defects should function as designed, and ~ based on information available to date, it cannot be substantiated that they would function otherwise. Similar events, as described in this memo, could exist at other facilities which have received contact block kits from Namco for rebuilding limit switches.

DATE ON WHICH A Non-Conformance Report was initiated on January 16, 1986; DEFECT WAS DETECTED and a potential Part 21 Report Evaluation was initiated on February 27, 1986.

NUMBER-0F COMPONENTS Vermont Yankee received thrity-five (35) Namco Contact AT FACILITY Block Kits, #EA749-20043, under Purchase Order No. 20145.

Of these fifteen-(15) were identified as being defective.

CORRECTIVE ACTIONS- Vermont Yankee has:

(1) Shipped all defective Contact Block Kits back to the vendor for evaluation.

(2) Accepted undamaged Contact Block Kits based upon the results of the reinspection performed after the damaged blocks were identified.

(3) Requested our Quality Assurance organization to re-evaluate Namco's QA program in light of the defects identi fied.

RELATED ADVICE Other facilities should be made aware of the defects identified at Vermont Yankee.

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