ML20209G191

Part 21 Rept Re Enerfab,Inc Containment Bldg Emergency Escape Airlock Design Deficiency.Initially Reported on 860724.Two Actuating Cams for Inner & Outer Equalizing Valves Modified

ML20209G191
Person / Time
Site:	Palisades
Issue date:	08/13/1986
From:	Johnson B CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-87-042-000 PT21-87-042-000, PT21-87-42, NUDOCS 8702050296
Download: ML20209G191 (5)

Text

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I 34 Consumers

@potrannuE Power AIKnlEAN5 PRSERESE General offices: 1946 West Pernall Road, Jackson, MI 49201 . (517) 788-0550 August 13, 1986 James G Keppler, Administrator Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -

10CFR21 REPORT - C0:4TAINMENT BUILDING EMERGENCY ESCAPE AIRLOCK The attached 10CFR21 Report provides information on the apparent design deficiency discovered in the Containment Building Emergency Escape Airlock supplied by Enerfab Inc. As a result of an evaluation of the deviation, concerning an improper can design that allowed equalizing valves to be open at the wrong times, it was determined that this occurrence is reportable in accordance with 10CFR21 " Reporting of Defects and Noncompliances".

This correspondence confirms a telecon report made to W G Guldemond of your staff August 8, 1986 and thus conforms with the notification criteria of 10CFR21.21(b)(2).

Brian D Johnson Staff Licensing Engineer CC Director, Office of Nuclear Reactor Regulation

) Director, Office of Inspection & Enforcement NRC Resident Inspector - Palisades Attachment g%

8702050296 860813 PDR ADOCK 05000255 S PDR .

OC0886-0130-NLO4 H /7 /

ATTACHMENT Consumers Power Company Palisades Plant Docket 50-255 10CFR21 REPORT CONTAINMENT BUILDING EMERGENCY ESCAPE AIRLOCK August 13, 1986 3 Pages IC0886-0130-NLO4

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EMERGENCY ESCAPE AIRLOCK DESIGN DEFICIENCY 10 CFR 21 REPORT

1) Name and address of individual informing the Commissions a) Telecon: DJFitzgibbon Palisades Plant Consumers Power Company b) Written: BDJohnson, P-24-606 Consumers Power Company 1945 West Parnall Road

. Jackson, Michigan 49201

2) Facility identification, activity or basic component which fails to comply or contains defects ist a) Facility: Palisades Nuclear Plant Provisional Operating License DPR-20 Docket No. 50-255 b) Component Containment Building Emergency Escape Airlock (no specific model number is applicable).

3) The firm constructing facility or supplying the basic component which failed to comply or contained defect ist a) Original Design: W J Woolley Oakbrook, Illinois b) Current Vendor Enerfab, Inc.

4955 Spring Grove Avenue Cincinnati, Ohio 45232 1C0886-01808-L101

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i Page 2 i ,

4) a. Nature of defect or failure to comply is: ,

The emergency escape airlock is provided with two valves to equalise  :

any differential pressure that may exist across the airlock doors.  !

The valves are actuated by a cas, such that, as the inner door is l opened, the differential pressure between the inside of the containment building and the inside of the airlock is equalised. In the same manner, as the outer door is opened, the airlock is vented to the  ;

outside of containment. At any time that one airlock door is open, i the opposite door and its equalizing valve must be securely closed. -

)

As a result of an improper can design, the coordination between ths airlock doors and the equalizing valves was not correct. The can profile for the outer door caused its equalising valve to lift as the inner door was opened. Similarly, the can for the inner door caused its equalising valve to lift when the outer door was opened.

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b. The safety hasard which was or could be created ist

( l The design of the actuating mechanism would result in a vent path -

from the inside of containment to the outside environment at any time  !

that an escape lock door was open. This configuration would affect [

! containment integrity as required by the Technical Specifications.

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5) The date when information of defect or failure to comply was obtained ist i

! The improper operation of the actuating mechanism was identified on f

July 24, 1986, and reported in accordance with the notification requirements

! of 10 CFR 50.72. The evaluation of the design defect was subsequently j completed on August 8, 1986.

, i i  !

j 6) In the case of a basic component which contains a defect or fails to comply,

! the number and location of all such components in use at, supplied for or 2

being supplied for one or more facilities or activities subject to Part 21 ist ,

The number of airlocks containing this defect is unknown. A representative I

) of Enerfab, Inc. has stated that similar airlocks may have been provided 4

4 to Nine Mile Point, Oconee, Shoreham and possibly Harris Nuclear Plants. i i

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I, Ic0886-0180s-LIO1 i

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7) a. The corrective action planned or taken is:

The two actuating cams for the inner and outer equalizing valves have been modified in that an appropriate section of the can profiles were removed with a grinder. Proper operation of the actuating mechanism has been visually verified.

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h. The name of the individual /oraanization responsible ist i Palisades Nuclear Plant Mechanical Engineering and Maintenance Consumers Power Company

c. The length of time required to complete action was or is estimated to be j

The corrective actions are complete.

8) Any advice related to the defect or failure to comply abou: the facility, activity, or basic component that has been, is being or will be given to )

purchasers or licensees:

No advice to other purchasers or licensees has, or will be, provided.

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IC0886-01808-L101

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