ML20024D598

Final Deficiency Rept on Condition 226 Re 125-volt Dc Motor Operator Connected to 250-volt Dc Power Source.Initially Reported on 830107.New Motor Operator Ordered for Valve RCIC-V-69

ML20024D598
Person / Time
Site:	Columbia
Issue date:	07/26/1983
From:	Carlisle C WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, GO2-83-658, NUDOCS 8308050309
Download: ML20024D598 (3)

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Washington Public Power Supply System P.O. Box 968 3000GeorgeWashingtonWay Richland, Washington 993fd!,r[(5 372-5000 Docket No. 50-397 f# g.

July 26, 1983 G02-83-658 EIG/0Ar pg, Mr. J. B. Martin Regional Administrator U.S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596

Subject:

NUCLEAR PROJECT NO. 2 REPORTABLE 10CFR50.55(e) CONDITION #226, 125VDC MOTOR OPERATOR CONNECTED TO A 250VDC POWER SOURCE

References:

a. Telecon dated January 7, 1983 (QA2-83-010), L.C. Floyd to J. Elin.

b. Leti.er G02-83-87, dated February 2, 1983, R.G. Matlock to R.H. Engelken.

In accordance with the provisions of 10CFR50.55(e), your office was informed l by telephone, of the above potentially reportable condition. Attachment I provides the Project's final report on the above condition.

If you have any questions regarding this subject, please contact Roger Johnson, WNP-2 Project QA Manager, (509) 377-2501, extension 2712.

. hwe Q C. S. Carlisle Program Director, WNP-2 LCF/kd

Attachment:

Final Report cc: W.S. Chin, BPA N.D. Lewis, EFSEC A. Toth, NRC Resident Inspector Document Control Desk, NRC C

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Attachment I WASHINGTON PUBLIC POWER SUPPLY SYSTEM NUCLEAR PROJECT N0. 2 DOCKET N0. 50-397 LICENSE NO. CPPR-93 10CFR50.55(e) CONDITION #226 125VDC MOTOR OPERATOR CONNECTED TO 250VDC POWER SOURCE Final Report Description of Deficiency The 125 Volt DC motor operator for valve RCIC-V-69, as installed, represents a nonconforming condition to the design in that the nameplate voltage (125

, Volt DC) is incorrect and inconsistent with the design voltage specified (250 Volt DC).

This inconsistency was originally discovered by the Architect Engineer (AE) while reviewing vendor drawings submitted for approval. This inconsistency was evaluated as a noncompliance, but not reportable under 10CFR50.55(e).

However, as the nonconforming motor operator was not returned to the vendor and was in fact installed, this does constitute a reportable condition under the provisions of 10CFR50.55(e).

Analysis of Safety Implication In the highly unlikely event that any one or all of the startup functional test programs would not have detected the noncompliance, the following safety significant condition would result.

RCIC-V-69 is designed to provide containment isolation and vacuum pump dis-charge valving to the supression pool. Failure of the valve in the open position would degrade primary containment isolation capability. However, containment integrity would not be violated, since a check valve is located outboard from RCIC-V-69. The condition would be a violation of containment isolation criteria and would be considered reportable.

Failure of the valve in the closed position would eliminate vacuum to the barometric condenser. This vacuum loss would prevent and/or terninate 3CIC turbine operation. The reactor core isolation cooling system is designed to maintain or supplement reactor vessel water inventory during the following conditions:

1. Normal Operation - When the reactor vessel is isolated from its primary heat sink (the main condenser) and maintained in the hot standby condi-tion.

2. Normal Operation - When the reactor vessel is isolated and accompanied by a loss of normal coolant flow from the reactor feedwater condition.

3. When required as a backup to the High Pressure Core Spray System to miti-gate the consequences of the rod drop accident by automatically supplying cooling water to the reactor if vessel low water is sensed.

Due to item 3 above, the failure would be considered reportable.

Attachment I Page 2 cf 2 Cause Failure on the part of the AE to correctly specify name plate voltage that is compatible with design bus voltage. 125VDC motor operated valves were designed such that they were powered by a 250VDC power source.

Corrective Action A new motor operator has been ordered for RCIC-V-69, and Nonconformance Report NCR-020634 has been initiated to identify the nonconforming condition.

Action to Prevent Recurrence A 100% review and field inspection has been performed on DC motor operated valves. This action consisted of a field review to confirm what voltage valve is installed and whot voltage power source is supplied to the valve.

The AE then reviewed the field inspection data to determine if the power supplies were appropriate for the valve design voltage and to ensure the proper voltage valve was installed for the application. As a result of the review and field inspection, one additional valve, RCIC-V-19, was identified as not being compatible; all other valves are compatible. RCIC-V-19 has been identified on Nonconformance Report NCR 20632, and a new motor has been ordered to replace the existing one, I In addition to the review of the DC motor operated valves, all AC motor oper-ated valves were reviewed to ensure design voltage to nameplate voltage com-patibility. This review has determined that all AC motor operated valves are compatible for 460VAC, 3 phese operation.

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