ML20196F168

Responds to NRC Bulletin 88-003, Inadequate Latch Engagement in Hfa Type Latching Relays Mfg by Ge

ML20196F168
Person / Time
Site:	Seabrook
Issue date:	12/02/1988
From:	George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Russell W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
IEB-88-003, IEB-88-3, NYN-88157, NUDOCS 8812120213
Download: ML20196F168 (5)

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Geotge S. Thomas vice ne9oerdw:i.or moducnon NYN-88157 Put2c Service of New Hampshire New Hampshire Yankee Division United States Nuclear Regulatory Commission Region I 475 Allendale Road t

King of Prussia, PA 19406 Attention:

Mr. William T. Russell Region Administrator

References:

(a) Facility Operating License NPF-56 Docket No. 50-443 (b) HRC Bulletin 88-03 ' Inadequate Latch Engagement in HFA Type Latching Relays Manufactured by General Electric Company (GE),' dated March 10, 1988

Subject:

Response to NRC Bulletin 88-03

Dear Sir:

In response to Reference (b), this letter provides the results of inspections of General Electric (CE) HFA latching relays in class lE safety-related applications and spare stock at Seabrook Station.

g Fourteen GE HFA latching relays were identified as requiring inspection per the requirements of the Bulletin.

Four of these relays were installed in Class lE safety-related applications and the remaining ten were in spare 3

i stock.

Two of the four installed relays were associated with the 4160 volt emergency bus (E5/E6) power transfer schemes and two provided an emergency i

diesel generator neutral ground alarm.

i The fourteen identified GE HFA latching relays were inspecced in l

accordance with the requirements of the Bulletin.

Four of the inspected j

relays failed to meet one or both of the Bulletin 88-03 acceptance criteria.

i A more detailed sumc.ary of the relay inspection results is provided in tabular

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form as Enclosure 1.

Prior to their required inspection, the four installed HFA latchinF relays were replaced with sp.sre relays meeting the Bulletin 88-03 acceptance l

criteria. Of the four originally installed relays, only one would have required replacement because of failure to meet the Bulletin acceptance i

criteria. The three remaining relays which failed to meet the acceptance criteria remain in spare stock and are under evaluation to determine their

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fiaal disposition.

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P.O. flox 3%. Seabrook, NH 03874. Telephone (603) 474 9574 th

s United States Nuclear Regulatory Commission December 2. 1988 Attention:

Mr. William T. Russell Page 2 The optional information regarding staff time and costs associated with activities prompted by NRC Bulletin 88-03 is provided as Enclosure 2.

This information is approximate and represents man-hours expended and costs incurred to date.

Should you have any questions regarding this information, plesse contact Mr. Geoffrey Kingston at (603) 474-9574 extension 3371.

Very truly yours, f

George S. Thomas Enclosure cc:

Document Control Desk (Original letter)

United States Nuclear Regulatory Commission Washington, DC 20555 Mr. Victor Nerses. Project Manager Project Directorate I-3 Division of Reactor Projects United States Nuclear Regulatory Commission l

Washington DC 20555 Mr. D. G. Ruscitto NRC Senior Resident Inspector Seabrook Station Seabrook. NH 03874 l

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ENCLOSURE 1 TO NYN-88157 Summary of GE HFA Latching Relay Inspection Results I

Failed to Meet criterion i 4

HFA Relay Total Original 1

2 Remarks Type Involved Location Bus E5/E6 54L 2

Svitchgear 1

1 Note 1 51B Bus E5/E6 2

Switchgear 0

0 154E Spare 5

Stock 0

1 151B Spare 5

Stock 0

2 Note 1:

The same relay failed to meet both criteria.

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et ENCLOSURE 2 TO NYN-88157 Licensee Hours And Costs Associated With NRC Bulletin 88-03 1.

Staff time to perform requested inspections, corrective actions, and associated operability testings.............. 60 hrs.

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Staff time to prepara requested documentationi............ 20 hrs.

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Additional cost incurred as a result of the inspection findings (e.g., costs of corrective actions, costs of down time):................................................Hinima1 l

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STATE OF NEW HAMPSHIRE Rockingham, ss.

December 2. 1988 Then personally appeared before me, the above-named George S. Thomas who, being duly sworn, did state that he is Vice President - Nuclear Production of Public Service Company of New Hampshire, that he is duly authorized to execute and file the foregoing information in the name and on the behalf of Public Service Company of New Hampshire, and that the statements therein are true to the best of his knowledge and belief.

G-+f yd Mary E. Sloan. Notary Public My Commission Expires January 8. 1992 1

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