ML19354E176

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Provides Results of Unit 1 latching-type Relays & Informs That Electrical Maint Procedure E005-2 Revised to Ensure That All Future Relays Will Be Inspected for Proper Latch Engagement Prior to Installation
ML19354E176
Person / Time
Site: Zion  File:ZionSolutions icon.png
Issue date: 01/22/1990
From: Richter M
COMMONWEALTH EDISON CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-88-003, IEB-88-3, NUDOCS 9001290194
Download: ML19354E176 (2)


Text

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L Commonwealth Edison

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Address Hoply to: Post Office Box 767

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= Chicago, lilinois 60690 0767

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January 22, 1990 j

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't-U.S.: Nuclear Regulatory Conunission:

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a"' ' ATTN: Document Control Desk ~

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1 Washington, DC-20555.

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h 'e Zion Station Units 1 and 2 1

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' Supplemental Response.to NRC Bulletin 88-03 NRC Docket Nos. 50-295 and 50-304

References:

'(a) -NRC Bulletin 88-03,' dated March 10, 1988.

L (b)

W.E. Morgan-letter to U.S. NRC, dated June 15, g

1988.

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/(c)

M.H.' Richter letter U.S. NRC, dated March-23, 1989.

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Dear Sir:

-Reference (a) requested-that addressees' perform inspections to ensure that'a11' General Electric'(GE) latching-type HFA1 relays installed in Class 1E-

?(safety-related)1 applications _have adequate latch engagement and that those

' relays which1 fail-to meet acceptance criteria'be repaired or-replaced.

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'l,~In accordanceLwith References l(a) and (b) the_ inspection of all GE HFA latching relays installed in ' safety-related applications;for Zion Unit 1 hasibeen performed. -For Unit 1,sHFA 54_and HFA 154 series relays are the only f

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GE.HFA_l'atching relays' used;in safety-related' applications. The inspections b

. were' performed on Unit-1 prior to and during the unit's Fall-1989 refueling' l

outage. During theiinspections, a relay was replaced.if it failed to satisfyc M

W all ofLthe GE acceptance' criteria delineated in-Reference (a). Any C

replacement-relay was verified to satisfy,all=of the' acceptance criteria.

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results)of'_the'. inspections are presented in the following t.able.

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L Relay Type Relay Type I,

HFA 54 HFA 154 l

No. of relays; inspected 97 4

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No. of relays replaced due to 0

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. insufficient' contact carrier

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'No. of relays replaced due to 0

0 insufficient' leaf spring: tension 9001290194 900122 A

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6 i*kS.NRC: January 22, 1990

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This completes the inspections of the GE HFA latching relays, as requested by Reference (a), for Zion Unit 1.

As indicated in Reference (c),

the inspection of the Zion Unit 2 relays, and the spue relays, has been completed. Therefore, no further action ic required by Zion Station for Reference (a).

It should be noted that Electrical Maintenance procedure E005-2 (HFA Relay Inspection and Adjustment) has been revised to ensure that all future spare GE HFA latching relays will be inspected for proper latch engagement prior to installation.

The following information is also being submitted to assist the Nuclear Regulatory Commission in evaluating the cost of implementing Reference (a).

-- Approximately 150 man-hours were spent identifying relays and writing test procedures.

Approximately 40 man-hours were spent performing the inspections.

Approximately 5 man-hours were spent providing requested documentation.

- The cost of replacing the HFA 154 relays was approximately

$1,128.00, and no other additional costs were incurred.

Please direct any questions that you may have concerning this response to this office.

Respectfully, o

M.H. Richter Generic Issues Administrator l

cc:

A.B. Davis - Regional Administrator, Region III Senior Resident Inspector - Zion C. Patel - Project Manager, NRR 7l:::::::: - ~

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" OFFIC; AL SEAL "

SUBSCRIBED AND SWORN to before me thiscDod day

% PATRICI A LYNN MARLOW 4 NOTARY PUBLIC. STATE OF ltLINOIS of no ii nh

,.1 90 1MY COMMISSION EXP;RES 11/ 5 / 9 1

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