ST-HL-AE-2321, Final Deficiency Rept Re Fgp Series Agastat Relays.Initially Reported on 870714.Qualified Relays & Sockets in Unit 2 Equipment Will Be Installed in Control Panels Prior to Diesel Start Testing

Final Deficiency Rept Re Fgp Series Agastat Relays.Initially Reported on 870714.Qualified Relays & Sockets in Unit 2 Equipment Will Be Installed in Control Panels Prior to Diesel Start Testing

ML20237J002
Person / Time
Site:	South Texas
Issue date:	08/12/1987
From:	Goldberg J HOUSTON LIGHTING & POWER CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
ST-HL-AE-2321, NUDOCS 8708170455
Download: ML20237J002 (4)

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s The Light company IIouston Lighting & Power _

• * "**"'**"' Y- Y b -N b b August 12, 1987 e

ST-HL-AE-2321 File No.: G12.397 10CFR50.55(e)

U. S. Nuclear Regulatory Commission Attention: Document Control Desk

. Washington, DC 20555 l

South Texas Proj ect Unit 2 Docket Nos. STN 50-498, STN 50-499 l Final Report Concerning FGP Series Agastat Relays j On July 14, 1987, Houston Lighting and Power notified your office, pursuant to 10CFR50.55(e), of an item concerning FGP Series Agastat Relays at the South Texas Project Unit 2. Enclosed is our Final Report on this item.

We have determined that this item is reportable pursuant to 10CFR50.55(e).

If you have any questions on this matter, please contact Mr.

S. M. Head at (512) 972-8392. y Y.

J. H. Goldberg Group Vice President, Nuclear i I l

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Attachment:

Final Report Concerning FGP Series Agastat Relays 6

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i I L4\NRC\md\hg-0 A Division of II ust n Industries Incorporated r i

4 Houston lighting & Power Company ST-HL AE-2321

' File No.: C12.397 l

-Page 2 l cc:

Regional Administrator, Region IV M.B. Lee /J .E. Malaski <

Nuclear Regulatory Commission City of Austin I 611 Ryan Plaza Drive, Suite 1000 P.O. Box 1088  ;

Arlington, TX 76011 Austin, TX 78767-8814 N. Prasad Kadambi, Project Manager A. von Rosenberg/M.T. Hardt U.S. Nuclear Regulatory Commission City Public Service Board 7920 Norfolk Avenue P.O. Box 1771 Bethesda, MD 20814 San Antonio, TX 78296 Robert L. Perche Project Manager Advisory Committee on Reactor Safeguards d U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission 7920 Norfolk Avenue 1717 H Street Bethesda, MD 20814 Washington, DC 20555 Dan R. Carpenter Senior Resident Inspector / Operations c/o U.S. Nuclear Regulatory Commission P.O. Box 910 Bay City, TX 77414 Claude E. Johnson Senior Resident Inspector / Construction c/o U.S. Nuclear Regulatory Commission P.O. Box 910 Bay City, TX 77414 j M.D. Schwarz, Jr., Esquire Baker & Botts One Shell Plaza l Houston, TX 77002 l

J.R. Newman, Esquire Newman & Holtzinger, P.C.

1615 L Street, N.W.

Washington, DC 20036 R.L. Range /R.P. Verret Central Power & Light Company P. O. Box 2121 Corpus Christi, TX 78403 r

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, .\ l; L Attachment' 1 I .ST-HL-AE-2321- {

l- File No.: G12.397' {

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I South' Texas Project l Unit 2 .

Docket Nos. STN 50-498, STN 50-499 l j Final Report Concerning FGP Series Agastat Relays' q I. Summary I i

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' As a result of a NRC Region IV request, a review of 10CFR21 report j P21-87-28 concerning improper seating of Agastat General Purpose (GP) '

. Series relays was conducted at the South Texas Project Electric Generating Station (STPEGS). The site inspections identified that'the j STPEGS does not have the'same problem as described in P21-87-28; however, the review identified incompatibility (improper seating) between Agastat .J FGP Series relays and their corresponding sockets used by Cooper-Bessemer W

in the diesel generator control. panels. If left uncorrected, the ability of the diesel generators to provide essential power for safe shutdown of .

Unit 2 could have been compromised.

1 II. Description of Deficiency Cooper Industries (CI) supplied STP the diesel generators for Unit 1 with control panels that used 1978 vintage Class.1E Agastat FGP relays and i sockets. In 1980, t.gastat redesigned their FGP relays and sockets. The l new relay base is slightly larger and required a new socket to accommodate the increase in the relay base dimension. In completing the-Unit 2 diesel generator panels, CI procured the 1980 vintage FCP relays.

However, the 1978 version of the mating socket was used in the panels. i Therefore, the Unit 2 FGP relays do not seat properly.in their respective- (

( sockets. While electrical connection is accomplished, the seismic l qualification of the relay and socket connection is unanalyzed. l 4

III. Corrective Action i 1

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In the Unit 2 equipment where the 1980 version of the FGP relays are used j with the older sockets, qualified relays and sockets will be installed in i the control panels prior to diesel statt testing.  ;

'I IV. Recurrence Control j

. The only use of FGP relays at STP is in the diesel generator panels. The l South Texas Project Restricted Components List has been revised to preclude the use of the newer design FGP relays and sockets without engineering evaluation.

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Attachment ,

1 ST-HL-AE-2321 File No.: G12.397-Page 2 of 2

i V. Safety Analysis The Agastat FGP relays and relay. sockets in the STP Unit 2 diesel-generator control panels were determined to be incompatible. The.

operability of these panels after a seismic event and subsequent loss of  !

offsite power is indeterminate. Had this deficiency remained uncor-rected, the ability of diesel generators to provide essential power.for, t safe shutdown of Unit 2 could have been compromised. Therefore, HL&P has determined that this item is reportable pursuant to 10CFR50.55(e).

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