AECM-84-0043, Suppl to Final Part 21 Rept Re Failure of Qualified Cables on Transamerica Delaval Generators to Pass IEEE Flame Test Due to Inadequate Temp Rating for Cable Insulation. Initially Reported on 821214

Suppl to Final Part 21 Rept Re Failure of Qualified Cables on Transamerica Delaval Generators to Pass IEEE Flame Test Due to Inadequate Temp Rating for Cable Insulation. Initially Reported on 821214

ML20080H989
Person / Time
Site:	Grand Gulf
Issue date:	02/02/1984
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-84-154-000 AECM-84-0043, AECM-84-43, PT21-84-154, PT21-84-154-000, NUDOCS 8402140410
Download: ML20080H989 (5)

Text

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MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 16 4 0 J AC K S O N. MIS SIS SlP PI 3 9 2 0 5 JAMES P. McGAUGHY, JR.

vaCE PRE SdOENT U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, N.W.

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

SUBJECT:

Grand Gulf Nuclear Station Units 1 and 2 PRD-82/37, Supplement to Final Report, Delaval:

Failure of Qualified Cables to Pass IEEE Flame Test; Inadequate Temperature Rating for Cable Insulation.

AECM-84/0043

Reference:

AECM-83/020, 1/13/83 On December 14,1982, '!ississippi Power & Light Company notified Mr. R.

Butcher, of your office, of a Potentially Reportable Deficiency (PRD) at the GGNS construction site. 'Ihe deficiency concerned the failure of qualified cable on the diesel generators to pass an IEEE flame test. Ihree cables on each diesel marator were a f fected.

This deficiency was first evaluated and determined to be reportable under I the provisions of 10CFR21 for Unit I and 10CFR50.55(e) for Unit 2, as reported in AECM-83/020,1/13/63. His evaluation was made based on the loss of the shielded cables associated with either the Airpax tachometer relay or the Airpax magnetic pickups.

Af ter the initial reporting , however, further investigation revealed that the IEEE flame test that the cables failed was not th e s ame fl ame t es t imposed by our Architect / Engineer's specifications. He test that the cables failed was IEEE 383, Section 2.5.4, the vertical tray flame test. The Grand Gulf Technical Specifications required only the vertical flame test of Section  %

2.5.6. Therefore, this deficiency did not af fect the qualification of these cables for the function in which they were being used. However, based on the evaluation that loss of these cables cculd cause a substantial safety hazard, the Unit I cables were replaced in both the Division I and II diesels in March ,

and April, 1983.

8402140410 840202 PDR ADOCK 05000416 PDR s OFFICIAL COPY p e , - y' L L I4.1 Member Middle South Utilities System

J. P. O'Reilly AECM-84/0043 NRC Page 2 s

In October,1983, MP&L received further notification from Delaval concerning .two of these same cables. This notification indicated that the

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manufacturer's temperature rating for:the cable insulation may be exceeded .

- during ' operation of the diesel generator. This deficiency affected two cables on :each generator. We have evaluated this deficiency and have detenmined that it is reportable under 10CFR21 for Unit 1 and 10CFR50.55(e) for Unit 2. On December. 20,.1983, MP&L notified Mr. Bob Carroll of this additional deficiency and its reportability.

P This' report was originally due on January 19, 1984, but an extension until February 2,1983, was granted by Mr. Paul Fredrickson and Mr. Bob Carroll. Details concerning the cable insulation temperature rating ,

deficiency are included 'in our attached supplemental report.

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

KDS:dr

. ATTACHMENT cc: Mr. J. B. Richard

'Mr. R. B. McGehee Mr. T. L. Conner ,

Mr. Richard C. DeYoung, Director

'Of fice of Inspection & Enforcement

.U. S. Nuclear Regulatory Commission

-Washington, D.C. 20555 Mr. G. ' B. , Taylor South Miss. Electric Power Association P. O. Box 1589

.Hattiesburg,1MS 39401

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Attachment to AECM-84/0043

' P4gs 1 of 3 SUPPLEMENT TO FINAL REPORT FOR PRD-82/37

1. Name and address -of the individual . . . in forming the commission:

J. . P. _ Mc Gaugh y , - Jr .

Vice-President,' Nuclear P.O. Box 1640 Jackson, Mississippi 39205

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

Grand Culf Nuclear Station (CGNS) Units 1 and 2 Port Gibson, Mississippi 39150 NOTE: 10CFR21 is .not applicable for Unit 2 as the diesei generators have not been turned over to MP&L.

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

contains a deficiency:

The Diesel Generators were manufactured by Transamerica Delaval, Inc. ,

' Oakland, California and supplied to Grand Gulf by Bechtal Power Corpo ration,' Caithersburg , ~ Maryland .

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

l A. ' Description of the Deficiency .l The manufacturer's temperature rating for engine mounted electrical cable. inculation may be exceeded during operation of the Delaval diesel generator.-

Two cables are affected:

1. The shielded cable which runs from the magnetic pickup to the engine mounted junction box. (Insulation rated @ 80*C.)

2. The multi-conductor cable which runs from the engine mounted terminal box to the W'o odward governor actuator. (Insulation rated 9 75'c.) ,

Both of these cables on the Unit i Division I and Division II diesels

had previously been replaced with IE qualified cables rated at 90*C.

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The ' cables for the Unit 2 dieselo have not been replaced.

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.- Attachtsnt to AECM-84/0043

, Prgs 2 of 3 The insulation on the shielded cables is rated for 176*F, or 80*C. If the ambient temperature were to exceed 129'F, the insulation temperature rating would be exceeded. The maximum ambient temperature at GGNS on both is 120*F. Therefore, the deficiency concerning the shielded cables is not applicable to CGNS.

The manufacturer's temperature rating for the cable insulation for the multi-conductor cable is 167*F, or 75*C. If the ambient temperature were to exceed 98.5*F the cable insulation temperature rating would be exceeded. Since the maximum ambient temperature at Grand Gulf is 120*F, this deficiency is applicable.

B. Analysis of Safety Implications Loss of the shielded cables associated with either the Airpax tachometer relay or the Airpax_ magnetic pickups would result in the loss of the 425 RPM " Ready-to-Load" signal to the diesel generator output breaker preventing the automatic closure of the breaker and loading of the generator. The design function of the system would not be accomplished and in the unlikely event of a loss of coolant accident, concurrent with

[' .a design basis fire, could create a substantial safety hazard.

If the multi-conductor cable between the Wbodward governor actuator and i the engine mounted terminal box failed, this would cause a loss of the L electrical governor, in which case the hydraulic / mechanical governor would take over control. The response time of the hydraulic / mechanical governor is too slow to res pond to the load sequence command of 5 second f.' intervals required during LOCA actuation. The diesel generator would

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therefore be incapable of responding as required to the load sequence command during the LGOA actuation.

5. 1The date on which the-information of such deficiency .. . was obtained.

Mississippi Power and Light received information of the problem regarding the cable insulation temperature rating from'Transamerica Delaval, Inc. on October 11, 1983. We reported the potential deficiency to Mr. Bob Carroll, of your office, on December 20, 1983. . An evaluation for Part 21 applicability has been completed for Unit 1 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.

Locations of other diesel generators with the same potential problem was reported by Delaval to the NRC in their letter of September 27, 1983.

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' Attcch22nt to AECM-84/0043

. Page 3 of 3

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 The ' cables (ni the Unit 1, Division I and Division II diesels were replaced in March and April,1983.

Both'of the cables on the Unit 2 Division I and Division II diesels will

- be replaced with IE cable rated -at 90*C.

B. Responsible Individual Unit 1 Unit 2 J. E. Cross T. H. Cloninger Nuclear Plant Manager Unit 2 Project Manager Mississippi Power & Light Co. Mississippi Power & Light Co.

C. Length of Time to Complete Actions Unit 1 cables have been replaced.

Unit 2 cables will be replaced prior to Unit 2 Fuel Load.

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

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

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