ML20084E782

Ro:On 700306,during Surveillance Test,Excessive Air Leakage Around Lower Handwheel Shafts That Penetrate to Outside Handwheels Noted.Ring of Packing to Lower Handwheel Shaft Added

ML20084E782
Person / Time
Site:	Ginna
Issue date:	03/13/1970
From:	Nelson E ROCHESTER GAS & ELECTRIC CORP.
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084E786	List: ML20084E782 ML20084E801
References
NUDOCS 8304150349
Download: ML20084E782 (2)

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1 Ginna Station g/ h- Y -*]MfC' 7 ~- N 7.s vs March 13> 1970 J '

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Dr. Deter A. Morris, Director ,

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Ditision of ilcacter Licensing n N s M

U. S. A . E. C.

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7030 Norfolk Avenue i

Bethesda, Maryland 20014 Subje ct- Excess leakage from all penetrations and isolation valves on 0-6-70 (Tech. Spee. 15.4.4.2.2), Ginna Station Unit -!!1 Docket Fo, 50-244 c

D'ar Dr. ! lorris:

Co Friday, strd 0, 3 ?70 at 0500 huurn, our engimers were conducting a ;urvoHltnce tem u A personnel air lock seals of the equipment hatch (15.4.1,2.4 11) using th pressure decay method.

When the air pressure between the two air lock doors reached 40 psig, it was noted that there was excessive air leakage around the lower of the two handwheel shafts that ponetrate to the outside hand wheels. A rough calculation at this pressure showed that we v;cre well above our allowed -

leahnge rate of 15,500 cc/ min at 60 psig, 000 F. The engineer entered ,

containment and found that the two shaft penetrations for the inside handwhents were leaking a considerable amount of air, with the lower ,

shaft packing leaking most of the air.

Mr. Doyle lhmnicult. of the A. E. C. Compliance office in Newark, N.J.

was notified immediately and a telegram was sent to Mr. R. W. Kirkman, Director-Region I, Division of Compliance.

A Plant Operating Review Committee meeting was called and the problem '

was discussed.

The design of the shaft sealing system on these four shaft penetrations is such that it is difficult to take up on the packing d very difficult to re-pack the seals, g

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' i, 8304150349 700313 PDR ADDCK 05000244 0gb.mer'I

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March 13,1: g 4p Dr luter A. h .cri N

i The firct repair wan the addition of a ring of packing to the lower handwheel chaft at the e:derior door. An air leakage retest at 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> on the air lock following thia firat repair indicated that the leahnge had been reduced to 6,000 cc/ minute v/hich ic within the Technical Spacification limits.

Cn Saturity, March 7,1970, maintenance men repqcked the lower hand-wheel cholt at the conta nment ride of the interior door. This took concidcrably longer than the repacking that was done on Frida3' bactruse an Indienting gear had to be cut from the chaft to permit cliding , ~ the pachlag ghrd far enough to parmit incertion of new packing. This was 3 completed at 1730 hourc and a subsequent air leakage test indicated tha l

1 leakage to be 2,170 cc/ minute at the 60 p'cig, 90 F condition.

l l V7e have been in contact with the designer of our personnel air locks and

we hopa to be able to come up with a revision to simplify taking up or

, replacing the chaft coalc.

I Very truly yours, t

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E' ward J. Nelson (

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