ML19339B309

Part 21 Rept Re Electroswitch Malfunctions,Reported on 800702.Switches Showed Contact & Indication Malfunctions During Sys Testing.Cause Undetermined by Vendor.Final Rept Will Be Filed by 810219

ML19339B309
Person / Time
Site:	Grand Gulf
Issue date:	10/28/1980
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-80-279-000 10CFR-050.55E, 10CFR-50.55E, AECM-80-267, NUDOCS 8011060700
Download: ML19339B309 (4)

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- N!!SSISSIPPI POWER S. LIGHT COMPANY Helping Build Mississippi

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"$s",MNEohf October 28, 1980

- l Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.

Suite 3100 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director

Dear Mr. O'Reilly:

SUBJEC,"f: Grand Gulf Nuc har Station Units 1 and 2 Docket Nos. 50-hj6/417 /

File 0260/15525/15526 PRD-80/38, Status Report #2, Electro Switch Malfunctions AECM-80/267

Reference:

AECM-80/172, 7/30/80 On July 2, 1980, Mississippi Power & Light Company n'otified Mr. F. Cantrell of your office of a Potentially Reportable Defi-ciency (PRD) at the Grand Gulf Nuclear Station (GGNS) construc-tion site. The deficiency concerns contact and indication mal-functions of Electro Switches, Series 20, Type PR-20.

We expect to conclude our investigation and determine repor-tability of this matter under 10CFR50.55(e) and 10CFR21 by Febru-ary 19, 1981. Details of this investigation are discussed in the attached status report.

Yours truly, Yfh6 p J. P. McGaughy, Jr.

WDH:mt Attachment cc: Mr. N. L. Stampley lir. Victor Stello, Directo Mr. R. B. McGehee Division of Inspection & Enforcement Mr. T. B. Conner U. S. Nuclear Regulatory Commission Washington, D.C. 20555 ,

Member Middle South Utilities System

, ** Attcchment A to AECM-80/267

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i STATUS REPORT #2 FOR PRD-80/38 I. Description

a. Electro Switches, Series 20, Type PR-20, supplied by General Electric, showed contact and indication malfunctions during .

system testing. The malfunction is when the switch is turned to the STOP position and released quickly, the internal cen-tact arrangement is such that the AUTO from START position contacts close rather than ,the AUTO from STOP position con-tacts. A similar malfunction occurs when the'svitch is quickly released from the START position. Three (3) switches (No. S3A, S3B, S3C) which experienced this malfunction are used in the Residual Heat Removal (RHR) System.

b. Electro Switch, GE Switch Number S3A, contains an additional problem with the internal contact arrangement of the switch.

The contacts are arranged such that turning the switch to the STOP position would start the RHR pump and vice versa.

This switch controls RHR Pump "A".

II. Proposed Resolution Mississippi Power & Light Company is working with the constructor to resolve this deficiency. The following steps are being fol-lowed in this effort.

a. Determine the extent of the deficiency;

b. Perform an analysis for affects on safety of operations over the expected lifetime of the plant assuming that the defi-ciency remains uncorrected;

c. Determine the cause of the deficiency; *

d. Determine and perform necessary corrective actions including actions to preclude recurrence; and

e. Determine reportability of the deficiency under 10CFR21.

III. Statuu of Proposed Resolution General Electric is performing the following actions:

a. Coordinate with the manufacturer, Electro Switch, to deter-mine corrective action for the condition described in 1(a), l above; I

b. Replace switch S3A noted in I(b), above; and

c. Evaluate the nonconforming condition with Electro Switch to determine affect on safety of plant operations.

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Attachment A.to AECM-80/267

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In addition, Bechtel has determined that these switches are not used in GGNS safety related equipment outside the Power

. Generation Control Complex (PCCC).

- IV. Reason for Delay in Final Report General Electric has not completed their evaluation and pro-posed corrective actions. Our final report requires this

, input for completion.

.V. Final Report Date We expect to file our final report on this matter by February 19, 1981.

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