AECM-83-0195, Interim Deficiency Rept Re GE Hea Relays.Initially Reported on 830217.Deficiency Not Reportable for Unit 1 Per 10CFR50.55(e).Investigation for Unit 2 Continuing.Final Rept Will Be Submitted by 830418

Interim Deficiency Rept Re GE Hea Relays.Initially Reported on 830217.Deficiency Not Reportable for Unit 1 Per 10CFR50.55(e).Investigation for Unit 2 Continuing.Final Rept Will Be Submitted by 830418

ML20072M215
Person / Time
Site:	Grand Gulf
Issue date:	03/18/1983
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, AECM-83-0195, AECM-83-195, NUDOCS 8304010172
Download: ML20072M215 (5)

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MISSISSIPPI POWER & LIGHT COMPANY

,; fielp'iiig Build Mississippi P. O . B O X .16 4 0;.I J A C K S O N ~. M I S S I S S I P P I 3 9 2 0 5 NUCLEAR PRODUCTION DEPARTMENT .

d March 18, 1983 Of fice of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region 11 101 Marietta Street, N.W.

Suite 2900 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 Docket No. 50-416/417 License No. NPF-13 File 0260/15525/15526 PRD-83/01, Interim Report, GE HEA Relays AECM-83/0195 On February 17, 1983, Mississippi Power & Light Company notified Mr. R.

Butcher, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns GE HEA Relays.

MP&L has evaluated this deficiency and determined that it is not report-able for Unit 1. This deficiency was reported, to your office, for Unit 2, as being potentially reportable under the provisions of 10CFR50.55(e). The investigation, for Unit 2, is continuing.

l Attached is our Interim Report. MP&L expects to submit a Final Report by

( April 18, 1983.

Yours truly, M

? McGaughy, Jr.

h p J.Vice P.President

! ACP:dr l ATTACHMENT cc: See page 2 l

8304010172 830318 PDR ADOCK 05000416 l S PDR ,

, VFFici,il. copy Member Middle South Utilities System A}l

e Mr. J. . P. O' Reilly AECM-83/0195-i NRC Page 2 - -

r cc: Mr. J. B. Richard Mr. R. B. McGehee 1

Mr. T. B. Conner.

Mr. Richard C. DeYoung, Director Office of Inspection & Enforcement i

U. S. Nuclear Regulatory Commission

, Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Hattiesburg, MS 39401 I

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s-s Attachment to AECM-83/0195 Page 1 of 2 INTERIM- REPORT FOR PRD-83/01 I. _ Description of the Deficiency On-August 31, 1981, Mississippi Power & Light Company received GE Service Advice (SA) 721-PSM-165.1 concerning a potential problem with GE HEA Relays which may fail to operate when the trip solenoid is ener-gized. The Service Advice concluded that the affected relays were e manufactured with malformed torsion springs during the period from May 1979 through December 1980.

i

' This deficiency is not applicable to the NSSS scope of supply for either Unit 1 or Unit 2 in that none of the safety-related HEA Relays which GE, supplied to Grand Gulf, were manufactured during the spring problem period.

This deficiency is not applicable tio the Bechtel scope of supply for Unit 1 in that a field inspection, by. MP&L Plant Staff, revealed no GE HEA Relays which had been installed in safety-related ' applications.

Therefore, the determination has been made that this deficiency is not

, reportable for Unit I under the provisions of 10CFR50.55(e) or 10CFR21.

For the Unit 2 Bechtel scope of supply,Lan investigation / inspection.was performed to determine if any of the HEA relays,- noted by the Service

. Advice, were used in safety-related equipment.' Two (2) relays were identified in safety-related applications. They are:

(1) 25AA-Cubicle #1 - Device 186B-2-Relay Type 12HEA61C238 (2) 26AB-Cubicle #1 - Device 186B-2-Relay Type .12HEA61C238

'Our Architect / Engineer has responded by saying thac according to the Service Advice those relays manufactured with malformed torsion springs-i will perform satisfactorily within. the limits of applied control voltage, 80% to 112.5% of nominal. Since the control' voltage for these relays will be within this voltage range, these relays will. perfona as i designed. The function of relay 186B-2 is to trip and lockout the incoming 4.16KV breaker. Should this relay fail to operate, the overcurrent relaying and/or the time /overcurrent neutral relaying for the connected ESF transformer will trip the transformer breaker and the associated diesel generator will start 'and feed the bus loads. After the diesel generators have picked up the bus loads the operator can verify the availability of an alternate source of power and manually sychronize' the bus to an alternate source of power from the available ESF transformers.

The design function of this relay is to trip the ESF bus during the fault condition which would have to occur to challenge the relay. Only one (1) ESF Division would be affected at a time. .

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Attachment to AECM-83/0195 Page 2 of 2 According to our Architect / Engineer, there would be no-impact on plant safety. However, MP&L Project Engineering is continuing to investigate this deficiency to determine reportability under the provisions of 10CFR50.55(e) .

11. Approach to Resolution of the Problem Investigations are continuing to determine if this deficiency is report-able for Unit 2. Our Constructor has determined that their corrective action will be to (1) test the relays per S. A. 721-PSM-165.1 and replace if necessary or (2) simply replace the relays.

III. Status of Proposed Resolution Our Constructor will have all corrective ections completed by October 15, 1983.

IV. Reason Why a Final Report Will Be Delayad A Final Report will be delayed until MP&L Project Engineering has deter-mined whether or not the rationale supplied by our Architect / Engineer substantiates that there would be no impact on safety.

V. Date When a Final Report Will Be Submitted MP&L expects to submit a Final Report concerning this matter by April 18, 1983.

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bec: Mr. R. T. Lally ]

Mr. J. F. Fager Mr. J. P. McGaughy, Jr.

Mr. J. F. Hudson Mr. C. D. Wood.

Mr. Adrian Zaccaria Mr. R. S. Trickovic Mr. J. W, Yelverton Mr..L. F. Dale Mr. C. K. McCoy Mr. T. H. Cloninger Mr. J. E. Cross Mr. J. F. Pinto Mr. S. H. Hobbs Mr. A. R. Smith Mr. M. D. Archdeacon Mr. C. C. Hayes Mr. A. G. Wagner Mr. J. Starling (2)

Mr. W. E. Edge Mr. J. E. Reaves PRD File Manual File File (6]

Mr. M. D. Houston

-U.~S. Nuclear Regulatory Commission Division of Licensing Washington, D. C.. 20555 5

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