AECM-83-0245, Final Deficiency Rept PRD-83/02 Re Possible Defect W/Liberty Control Co Telephone Relays Used in GE Protective Relays. Initially Reported on 830217.Relays Will Be Replaced. Item Not Reportable Per 10CFR50.55(e)

Final Deficiency Rept PRD-83/02 Re Possible Defect W/Liberty Control Co Telephone Relays Used in GE Protective Relays. Initially Reported on 830217.Relays Will Be Replaced. Item Not Reportable Per 10CFR50.55(e)

ML20069K695
Person / Time
Site:	Grand Gulf
Issue date:	04/18/1983
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-83-0245, AECM-83-245, NUDOCS 8304260450
Download: ML20069K695 (5)

Text

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E MISSISSIPPI POWER & LIGHT COMPANY ,

Helping Build Mississippi P. O. S O X 16 4 0, J A C K S O N , M I S S I S S I P P I 3 9 2 ([3  ;

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l' b JAMES P. McGAUGHY. JR.

vics nasiosur April 18, 1983 D'  : t ')

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Of fice of Inspection & Enforcement C U. S. Nuclear Regulatory Commission ~

kegion 11 {,

101 Marietta Street, N.W. -

Suite 2900 Atlanta, Georgia 303d3 Attention: Mr. J. P. O'Reilly, Regional Administrator

Dear Mr. O'Reilly:

SUBJECI: Grand Gulf Nuclear Station Units 1 and 2 Docket No. 50-416/417 License No NPF-13 File 0260/15525/15526/16694.4 PRD-83/02, Final Report, Liberty Control Telephone Relays AECM-83/0245

Reference:

AECM-83/0196, 3/18/83 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 Liberty Control Telephone Relays.

As previously reported, MP&L has evalisated this deficiency and determined that it is not reportable for Unit 1. Also, a Fi.nal Report was to be delayed until MP&L Project Engineering had determined whether or not the rationale supplied by our Architec'.iEngineer substantiates that there would be no impact oc safety for Unit 2. MP&L hus determined that this deficiency is not reportable for Unit 2.

Details are provided in our attached Final Report.

Yours truly f1

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ACP:dr p' ATTACHMENT cc: See page 2

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, w a riNI 8304260450 830418 PDR ADOCK 05000416 s PDR Member Middle South Utilities System

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. Mr. J. P. O'Reilly AECM-33/0245 NRC Page 2'

' ec: Mr. J. B. Richard Mr. R. B. McGehee Mr.'T. B.-Conner Mr. Ricuard C. DeYoung, Director

, Office of. Inspection & Enforcemer.2 L' U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association.

P. O. Box 1589 Hattiesb arg',- Its 39401

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8 Attachment to AECM-83/0245 Page 1 of 3 4

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- FINAL REPORT FOR PRD-83/02 I.- Description of the Deficiency ,

On; May 5,1982, . Mississippi Power ' &' Light . Company received GE Service Advice1 (SA) 721-PuM-167.1 concerning a possible defect .with Liberty L Control' Company telephone relays that'are used in General Electric Protective Relays. The Service Advice states that_the defect involves a

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contact button separated from the contact arm of.the relay on relays

' manufactured between July 1980'and February 1982 - .

. This /eficiency is not applicable to the NSSS ecupe of supply for either

- Unic I of Unit 2 in that none of the relays which GE supplied to Grand Gulf had anyf problems as described in the Service Advice letter.

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This deficiency is not applicable to the Bechtel scope of supply for

. Unit .1' in that a field inspectica, by MP&L Plant Staff, revealed no relays which- fell within the specified time frame of the Service Advice.

• Therefore, the determination has been made that this deficiency is net reportable, for Unit 1, under the provisions of 10CFR50.55(e) or

- 10CFR21.

.For the. Unit 2 Bechtel- scope of supply, an investigation / inspection was performed to determine'if any of the relays, noted by the Service Advice,' were used in safety-related equipment. Seven (7) relays were

- identified 'in safety-related applications. They are:

. (1) 25BA3 - Device 27/62 - Relay Type 12SAMll A22A

- (2) 25BA6 - Device 27/B - Relay Type 12hGV12B15A" (3) 2H22. - P113 - Device 151GD Relay Type 12SFC151A1A (4) 2H22 - P113 - Device 127DA - Relay Type 12NGV13B21A (5) 2H22 - Pil5 - Device 159 _ Relay Type 12NGV23A2A (6) 2H22 - P115 - Device 151GD tRelay Type 12SFC151AI A (7) 21DA - Device 27B - Relay Type 12NGV18A2A Our Architect / Engineer responded to each of the above relays with the folicuing rationale.

For relays (1) and (2):

Relay 2 7/62 for bus 25BA3 has a Norm:11y Open (N/0) ccur.act which accuates auxiliary relay 27X during load center bus 25BA3lundervoltage.- Relay. 27X is used to trip bus loads t~ <

during bus 25BA3 undervoltage. There fore, failure of relay

< 27/62 will affect only load centor 25BA3 of Division I power.

Divisionil1 power is unaffected.

The same ratiS4 ele applies to relay 27/B.

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, i Attachment to AECM-83/0245 Page-2 of 3~

Since the design function of this relay is to trip en bus under-

- voltage, which would have to occur ~to initiate a challenge to the relay,-the bus leads would not be available in any case.

For relays (3) and (6):

- Relay 151GD is used as a diesel generator ground fault detection relay. . Designed operation of this ~ relay, even during LOCA, is to l trip the gener ator. Irrespectiva of the operation of tha 15)CD relay the diesel generator would be considered to be unavailable due to the ground fault condition. - A relay failure would affect only one power division and would not decrease the designed availability of the diesel generator.

For relay (4):

This telay is installed but not used.

For relay (5):

This overvoltage relay only provides an alarm of an overvoltage condition at the diesel generator and does not have any. control function.

And for relay (7):

The relay provides only an alarm of the undervoltage condition of 125V DCo ' us 21DA and has no control function.

For tha Unit 2 Balance of Plant (BOP)-- PGCC six (6) relays were o-identified. They are:

(1) 2H13-P801 Device N41-M746 (460/G22) Relay Type 12CFVBilB1A (2) 2H13-P801 Device N41-M754 (459/481-1/G2) Relay Type 12STVilA1A (3) 2H13-P812 Device 2R12-M78! (563X-1/T21B) Relay Type 12NGA15U2 (4) 2H13-P812 Dev' ice.2R12-M782 (563X-2/T21B) Relay Type 12NGA15U2 (5) 2H13-P812 Device 2Rll-M781 (563X-1/T21A) Relay Type 12NGA15U2 (6) 2H13-P812 Device 2Rll-M782 (563X-2/T21A) Relay Type 12NGA15U2 These six relays are non-class lE and have no impact on plant safety.

II. Analyris of Safety implications Our Architect / Engineer and MP&L Projece Engineering have determined that any singular failure would not adversely affect the safe operation of the plant and that this deficiency is nat reportable under the provisions of 10CFR50.55(e) for Unit 2.

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1 Attachment' to AECM-83/0245 Page 3 of.3 III. Corrective Actions Taken Our Constructor has determined that the corrective action will be 'to replace the nonconforming relays. , ,

All corrective action will be completed by October 15, 1983.

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