ML20062J356

Final Deficiency Rept Re Failure of Switching Relay in Unit 1 Division 1 Standby Diesel Generator.Initially Reported on 820326.Relay Replaced & Design Error for Both Units Corrected.Also Reported Per Part 21

ML20062J356
Person / Time
Site:	Grand Gulf
Issue date:	08/09/1982
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, AECM-82-340, AECN-82-340, NUDOCS 8208160339
Download: ML20062J356 (5)

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MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi M II 115 E 'Em P. O. B O X 184 0. J AC K S O N, MIS SIS SIP PI 3 9 2 0 5 August 9, 1982 JAMES P. McGAUGHY, JR. gy ASS.STANT viCE PAEsiOENT Office of Inspection & Enforcement i U. S. Nuclear Regulatory Commission -

Region II ~

101 Marietta Street, N.W. p Suite 3100 cc 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-82/15, Final Report, Relay Failure Division I Diesel Generator AECM-82/340

Reference:

AECM-82/268, 6/15/82 AECM-82/189, 4/26/82 On March 26, 1982, Mississippi Power & Light Company notified Mr. R.

Butcher, of your of fice, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerns the failure of a switching relay in the Unit 1 Division I Standby Diesel Generator.

As previously reported, this deficiency has been determined to be reportable under the provisions of 10CFR50.55(e) and 10CFR21 for Unit 1 and 10CFR50.55(e) for Unit 2. Information obtained as of this date is included in our attached Final Report.

l Yours truly, J. P. McGaughy, Jr.

KDS:dr ATTACRMENT See Page 2 for distribution 8208160339 820809 <

, q.triA.L C PDR ADOCK 05000416 Member Middle South Utilities System

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Mr. J. P. O'Reilly AECM-82/340 NRC Page 2 cc: Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Richard C. DeYoung, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. C. B. Taylor i South Miss. Electric Power Association

, P. O. Box 1589

! Hattiesburg, MS 39401 i

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Attachment -to - AECM-82/340 Page 1 of 3 t

FINAL REPORT FOR PRD-82/_1_5 ,

1. - Name and address of the individual ... informing the commission: = i

.J..P. McGaughy, Jr. .

Assistant Vice-President, Nuclear Production P.O. Box 1640 Jackson, Mississippi 39205' Notification of Part 21 applicability made to Mr. J. P. O'Reilly, NRC, Region .

II by letter AECM-b2/268, J2ne 15,1982. ,

2. Identification of the' facility ... which ... contains'a deficiency:

Grand Gulf Nuclear Station (GGNS) Units 1 and 2 ,

Port Gibson, Mississippi 39150  ;

3. Identification of the firm ... supplying the basic component which ...

contains a deficiency: ,

The Standby Diesel Generators supplied to Grand Gulf by Bechtel Power o Corporation were purchasen from Transamerica Delaval, Inc. , Oakland, California.

4. Nature of the deficiency ... and the safety hazard which ... could be created by such a deficiency ...:

A. Descrigtton of the Deficiency.

During testing, the Unit 1 Division I Standby Diesel Generator started in i response to the simulated LOCA signal and reached rated ' speed but failed to reach rated voltage. It was found that the relay which transfers voltage control- from the manual voltage regulator to the automatic volt- <

age regulator was inoperative. As a result, the voltage output of the i generator did not come up to rated voltage af ter the diesel' had started and come up' to rated speed. j t

j B. Analysis of Safet,y Implications 1

In the event that testing had not detected this-failure, and.the Division I diesel had remained in manual control and had been required to start (

and carry all of its normal loadu, the voltage could have been so low

that the diesel output breaker would not have closed due to a low output  !

voltage interlock. This would result in the loss of two ECCS pumps, the  ;

! RHR "A" pump and the LPCS pump.

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Attachment to AECM-82/340 Page 2 of 3

5. The date on which the information of such deficiency ... was obtained.

Mississippi Power and Light received information of the deficiency on March 25, 1982. We reported the deficiency to Mr. Ross Butcher, of your office, as a Potentially Reportable Deficiency on March 26, 1982. Since that date MP&L has filed two (2) Interim Reports to inform the Commission of the progress and status of the evaluation of this deficiency. An evaluation for Part 21 has been completed and the MP&L " Responsible Of ficer," Mr. J. P. .McGaughy, Jr., has been notified.

6. In the case of the basic component . . . the number and location of all such components.

1 We do not have knowledge of the location of defective equipment located other than at GGNS. .

7. The corrective action which has been taken ... the name of the individual ...

responsible for the action; and the length of time that has been ... taken to complete the action.

A. Corrective Actions Taken f

The failed relay on the Unit 1 Division I diesel was replaced with 4

another relay of the same design, which tested satisfactorily. The cir-cultry of the relays for both the Unit I and Unit 2 diesels will be modified, per DCP-82/3538, prior to 5% power testing for Unit 1, to <

remove voltage from the relays once the relays are latched in either an open or closed position. A temporary alteration has been installed on Unit I which will physically retain voltage control in the " Automatic" mode until the Design Change is incorporated.

Our Architect / Engineer and their vendor have investigated the cause of t the design error, and have determined that the ori6 inal design intent was ,

to have the circuit operate exactly as it presently operates, with constant voltage applied to the relay. In 1974-75 when this circuit was designed, the relay, Magnecraf t W88LCPX-12, was advertised by the  !

manufacturer, as being a continuous duty relay. However, some time later, at least by 1981, the Magnecraf t catalog no longer advertised the j relay as having continuous duty capability. Therefore, the original i design was correct, but due to a nanufacturing specification change, the ,

relays installed were pulse-type relays only.

B. Respons,1ble Individual l

Unit 1 Unit 2 <

C. K. McCoy T. H. Cloninger Nuclear Plant Manager Unit 2 Project Manager Mississippi Power & Light Co. Mississippi Power & Light Co.

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Atttchnant to AECM-82/340 Pags 3 of 3 C. Length of Time to Complete Actions The circuitry modifications .for the Unit I diesels will be coispleted by 5% power testing. The corrective actions for . Unit 2 will be completed prior . to Fuel Load for that unit.

8. Any advice related to the deficiency ... that has been, is being, or will be given to purchasers or licenseer:

As the deficiency did not originate with MP&L, we have no advice to of fer.

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