L-88-392, Forwards Response NRC Bulletin 88-003, Inadequate Latch Engagement in Hfa Type Latching Relays Mfg by Ge. Twenty Hfa Relays of Type Described by Bulletin Installed in safety-related Sys
| ML20207J667 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 09/22/1988 |
| From: | Conway W FLORIDA POWER & LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-88-003, IEB-88-3, L-88-392, NUDOCS 8809280076 | |
| Download: ML20207J667 (3) | |
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e P. O. 80X 14000, JUNO BE ACH, FL 33408 0420 g//g $lPTEMBER 2 2 1988 L 88 392 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 Centlemen: Re: St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50 389 NRC Bulletin No. 88 03 Inadequate Latch Engagement in HFA TYPE Latching Relays Manufactured hv Ceneral Electric (GE) Correany By the subject Bulletin, the NRC staff requested that licensees perform inspections to ensure that all CE latching type HFA relays installed in Class 1E (safety related) applications have adequate latch engagement and that those relays which fail to meet acceptance criteria be repaired or replaced. The attached complete response to the Bulletin is provided purcuant to Section 182a of the Atomic Energy Act of 1954, as amended. If further information is required on this topic, please contact us. Very truly yours, 1fttW V. F. Con Senior Vice President Nuclear VFC/GRM/cm Enclosure cc: Dr. J. Nelson Grace Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, St. Lucie Plant 1 l t i L i g(I CRsILE I hN"R88Enggggg2 F$ an FPL Group company
I i STATE OF FLORIDA ) ) ss. t COUNTY OF PALM BEACH ) l W. F. Conway being first duly sworn, deposes oad says: That he is Senior Vice President. Nuclear - of Florldo Power & Light Company, e the Licensee herein; i That he has executed the foregoing documentt that the statements made in this l document are true and correct to the best of his knowledge, Information, and belief, and that he is authorized to execute the document on behalf of sold Licensee. 1 ? l i W. F. Cd6way t l I I j Subscribed and worn to before me this l h Mdoy of t/ rA ha Ito,19, / [ W cIbt c d O X 8 7ty s v / g i i NOTARY PUBLIC,in and for the County 2 of Palm Beoch, State of Florido i I heary h,W. State of Rida gy comneden Esp'nes La t 19H My Commission expirest --*'*'aa-** I I i I i ? .\\ L i i .,,--...,-_..n.-,..-- ,..-,,._,,n.---,, ,,,n_._, ,-n---
Mac not. LATIN woo 88-03 i r Actions Requested: Addressees should complete the actions described below for all latching-type HFA relays in Class 1E (safety-related) applications no later than restart following the next refueling outage scheduled to begin 30 days or more from receipt of this bulletin. 1) In accordance with the GE recommendations contained in Attachment 1, measure the distance between the top of the molded contact carrier and the top of the relay armature. This distance should be a minimum of 1/32 inch. 2) In accordance with the GE recommendation contained in i Attachment 1, with the armature fully depressed against 1 the pole piece, check to see if the latch is fully rotated by pulling up on the latch assembly. If the latch is i fully rotated, there should be no more motion of the latch, since the latch should be held against the armature by spring tension. 3 3) Repair or replace any relay which faf1s the above inspections, such that the relay satisfies the GE j criteria. 1 i 4) Inspect all existing spare HFA relays as above. Future 1 l spares received should be inspected prior to their i installation if manufactured prior to November 1, 1987. i Action Taken: J Twenty (20) HFA relays of the ty pe described by the bulletin l 1 were installed in sa f e ty-rela ted systems. Inspections were performed on the relays using the criteria listed in Items t i 1 & 2 above. Seventeen (17) were type HFA-54E and four (4) failed to meet the criteria. The four f ailures were replaccd i) with type HFA 154E Century Series models which were tested satisfactorily. The three remaining installed relayssatisfactorily. pected ins Final were type HFA 154E and were tested inspection results are as follows: Seventeen (17) type HFA 54E were inspected with four (4) i that failed due to latch motion with the latch fully rotated. (Item 2). Seven (7) type HFA 154E were inspected with no failures. i Future spares received will be inspected prior to their l l installation if manufactured prior to November 1, 1987. l 1 i i n
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