ML19330B796

Part 21 Rept Re GE Medium Voltage Penetrations.On 800620,air Inside Containment Found Escaping Through Three Penetration Modules Into Auxiliary Bldg.Testing Revealed Leakage Problem in All Six Medium Voltage Penetrations

ML19330B796
Person / Time
Site:	Farley
Issue date:	07/22/1980
From:	Clayton F ALABAMA POWER CO.
To:
References
REF-PT21-80-262-000 NUDOCS 8008070007
Download: ML19330B796 (3)

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PRELIMINARY EVALUATION OF THE ATTACHED REPORT INDICATES LEAD RESPONSIBILITY FOR i FOLLOWUP AS SHOWN BELOW: .

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F. L. CLAYTON, JR.

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Alabama Power I~~'

July 22, 1980 rnesov:*em elecresystem c

Joseph M. Farley Nuclear Plant - Unit 2

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DearMr.O'Reilly.:

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' Alitbama Power Company submits the attached deficiency (10CFR50.55(e))

evaluation report on the problem associated with the GE medium voltage

', penetrations on Joseph M. Farley Nuclear Plant Unit 2. The attached is' i -. also, intended to meet reporting' requirements of 10CFR, Part 21.

'- Alaba=a Power Company reported the problem as a possible sigIEificant

~ deficiency and-a possible defect to Mr. M. D. Hunt, U. S. NRC on June 26, 1980.

If you have any questions, please advise.

1 Very truly yours, 9 .

b.Clayton, FLCJr/TNE:aw Attachments s-cc: Mr. R.- A. Thomas Mr. . F. Trowbridge

. W. H. Bradford

.r. Victor Stello, Jr., I&E Mr. M. D. Hunt, Region II

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DEFICIENCY EVALUATION FOR ELECTRICAL PENETRATION, AIR LEAYdGE JULY 22, 1980 Initial Report to NRC On June 6, 1980, Mr. W. C. Petty, Nuclear

_ . Design and Construction QA Manager for v . ' Alabama Power Company, notified Mr. W. M. Hunt F .

J' "of the NRC. Region Il concerning a problem on M '

~u ,, a - . the medium voltage electrical penetrations

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. at Farley Nuclear Plant Unit 2.

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On June 23, 1980,, Mr. W. C. Petty notified.

,'. . - . Mr. W. M. Hunt that this problem was a

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..L  : , possible 10CFR50.55(e) and a possible.10CFR21.-

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' Description of Occurrence

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A problem was discovered at Farley Unit 2 by the startup section on June 2, 1980 during Structural Integrity Testing (SIT). Air inside the con-tainment was found. to be escaping through three (3) of the 4160 volt penetration-

. modules, furnished by GE, into the auxiliary building. The path for the air leakage is through the cable into the penetration module and back out of the cable on the other side of the penetration. This leakage was not detected by the Local Leak Rate Test. A local Leak Rate Test of these penetrations, both before and after SIT, did not indicate any excessive leakage. . Subsequent tests revealed a leakage problem in all six (6) of the medium voltage penetrations.

Analysis of' Safety Implications The electrical penetrations terminate in the auxiliary building. No credit is allowed in Chapter 15 accident analysis for the penetration room filtration system. Using an assumed leakage rate of 10sefm to 20 scfm, a. calculation was performed to see if any criteria was violated. Based upon this calculation, it appeared that 10CFR100 limits for thyroid exposure could pos.sibly be exceeded. Therefore, it.can b'e concluded that, under 10CFR50.55(e), the deficiency, if uncorrected, could have r.dversely affected the safety of operations of the nuclear power plant.

Since a prototype of the GE Series 100 medium voltage penetrations was successfully tested, the Appendix B criteria, Design Control, is satisfied.

This criteria states "where a test program is used to verify the a.dequacy of a specific design feature, in lieu of other verifying or checking processes, it shall include suitable qualification testing of a prototype unit under the most adverse design condition". The Series 100 penetrations successfully passed prototype testing. It cannot be concluded that, under 10CFR.55(e), there has been a significant breakdown of the quality assurance program.

The Series 100 med'ium voltage penetrations are designed to be zero leakage penetrations. The defects found in the penetrations will be corrected as.

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ed E- Corrective Action The following corrective action is being taken to resolve problems encountered with the 4kv electric penetrations in Unit 2:

(1) All penetration assemblies will have all cables (3 per-y assembly) determinated at both ends, thus exposing the .

> bare conductor strands both in containment and outside .  :;n -

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(2) A cap will be installed over the end of each penetration 7' assembly in containment, and the cap will be pressurized-iE. internally. This will simultaneously apply pressure to: ....-

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the. bare conduct' ors of all 3 cables in the assembly. _-r 1. ..

g;' Pressure will be maintained, for several hours to: allow - . ... ., . . . _ _ ,

any leaks to develop, then each cable will be checked .

+ ~ for leakage at ,the outer end by submergence .Also the

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. _ _ - internal _ module test volume will be monitored.to determine if any modules are leaking through this path. .

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-- :;:n i (3) All leaking cables determined-above-will be sealed.by - , . .-

f .  : submerging:the containment end in epoxy and pressurizing .- - - -

to about 60 psig to force the sealant through the leak. -

path. The cable will then be depressurized and cleaned. __.

, This procedure was proposed by the vendor (GE) and -

= approved by Bechtel.: L. .. . ...

(4) Following a minim'um epoxy cure period of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the .

cap sill be reinstalled and a leak test at 54 psig will be performed. Following this test, a local leak test at the test connection yill be performed. Leakage for the three assemblies that were blocked during the ILRT will be added to the Type A integrated leakage in the ILRT Test Report. Any leakage through the other three assemblies will be reported in the ILRT Test Report for a information'. ,

(5) Following successfully completing leakage tests, each conductor will be subjected to an insulation resistance test and will then be reterminated.

Summary and Conclusions In conclusion, it is believed that the leakage problem associated with the GE Series 100 medium voltage penetrations represents a significant deficiency.

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