ML20028E764

Interim Deficiency Rept 83-01 Re Westinghouse Emd Gate Valve Position Indication.Initially Reported on 821223.Gate Valve Applications in Cold & Hot Leg Safety Injection Lines May Require Mod.Investigation Continuing.Next Rept by 830531

ML20028E764
Person / Time
Site:	Wolf Creek, Callaway, 05000000
Issue date:	01/21/1983
From:	Petrick N STANDARDIZED NUCLEAR UNIT POWER PLANT SYSTEM
To:	Jay Collins, James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, 83-03, 83-3, NUDOCS 8301280182
Download: ML20028E764 (3)

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• SNUPPS Stenderdized Nesteer Unit Power Plant System s choke cherry need Nicholas A.Pewick v send 20060 Executive Director January 21, 1983 SLNRC 83- 03 FILE: 0491.10.2 SUBJ: Westinghouse EMD Gate Valve Position Indication Issue; 50.55 (e) Interim Report 83-01

r. James G. Kepple, Director USNRC Office of Inspection & Enforcement, Region III 799 Roosevelt Road Glen Elyn, Illinois 60137 Mr. John T. Collins, Director USNRC Office of Inspection and Enforcement, Region IV 611 Ryan Plaza Drive Arlington, Texas 76102 Docket Nos.: STN 50-482 and 50-483 Gentlemen:

On December 23, 1982, SNUPPS informed the Nuclear Regulatory Commission, Region III and IV Offices of Inspection and Enforcement of a potential deficiency regarding the Westinghouse EMD gate valve position indication.

This notification was based on information from Westinghouse provided on December 22 and 23,1982 to SNUPPS. Westinghouse Water Reactor Div-l 1sions Safety Review Committee determined on December 22, 1982 that "a significant deficiency as defined in 10CFR 50.55(e) exists for Callaway and Wolf Creek ...." regarding this issue. Further details are provided herein on this matter, with this letter being an interim report. A l

follow-up report on thir. matter will be provided by May 31, 1983, when I

any specific corrective actions for each valve are defined.

The issue involves the valve position indication for certain Westing-house manufactured gate valves. An indication of " closed" could occur prior to the valve disc fully isolating flow. If the valve should stall l

or bind following the premature closure indication being given, the op-i erator would have an inaccurate indication of true valve position.

A geared limit switch rotor is set to provide an electrical bypass of I the OPEN torque switch at the beginning of the opening stroke. On a closing stroke, this switch changes state before the flow path is com-pletely blocked. As a result, it is likely that monitor and/or indicator lights also operated by that rotor will indicate valve closure slightly before the flow path is completely shut off. If the valve were to stop between this setpoint and the full shut off position, a flow path through the valwa ~~ "

8301280182 830121

• t even though a CLOSED indication had been achieved. M P,DRADOCK05000g g 4 jgg3 ts

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SLNRC 83-03 Page 2.

Depending on the valve application and consequences of inaccurate closure indication, the wiring of certain valves may need to be altered to' avoid the issue defined above. This conclusion is based on the Westinghouse

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generic wiring specification. Further checking is still required to ensure that these valves have not been modified to meet additional '

requirements or rewired as part of modifications to increase shut off pressure rating.

A review of the gate valve applications in the cold and hdt ' leg safety injection lines for the SNUPPS plants has indicated that the valves tabulated in the attachment may require modification. This list includes all valves where incorrect position indication by itself may cause an unacceptable situation that could violate the established licensing basis. Valves identified in the attached listing are provided for~

information only. As stated above, any specific corrective actions for each valve will be defined by May 31, 1983.

Verygrulyyours, M OC v Nicholas A. Petrick J0C/nld2b27 Attachment cc: G. L. Koester KGE D. T. McPhee KCPL D. F. Schnell UE J. H. Neisler NRC/ CAL T. E. Vandel NRC/WC _

J. Konklin NRC Region III-R. Redano NRC Region IV l

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