ML19318B090

Forwards Bechtel 800508 Suppl to Final Deficiency Rept Re Ruskin Mfg Co Vertical Fire Dampers.Mod Proposed in 800215 Final Rept Is Unacceptable Since Number 6 Screws Could Become Loose.Ruskin Has Developed Successful Design Mod

ML19318B090
Person / Time
Site:	Wolf Creek, Callaway
Issue date:	05/16/1980
From:	Petrick N STANDARDIZED NUCLEAR UNIT POWER PLANT SYSTEM
To:
References
NUDOCS 8006250018
Download: ML19318B090 (8)

Text

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NSIC SNUPPS CE M m ES Standardised Nuedeer Unit Power Mont System 5 Choke Cherry Road Nicholas A. Petrick v and 20:50 Exec itive Director May 16, 1980 SLNRC 80-24 FILE: 0491.10.2/M-6278 SUBJ: Ruskin Manufacturing Co. Fire Dampers: SNUPPS Units 1 (Wolf Creek) and 2 (Callaway 1)

Mr. Boyce Grier Director, Region I Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia,_' Pennsylvania 19406 Re:

f7 STN 50-486 Ref: a) SLNRC 80-3 dated 2/15/80: Subject as Above b) SLNRC 80-16 dated 4/3/80:

Dear Mr. Grier:

The Ref. a) letter forwarded to the NRC per 10CFR50.55(e) regulations, a report concerning deficiencies in the vertical fire dampers furnished by Ruskin Manufacturing Co. to the Callaway and Wolf Creek jobsites. The Ref. b) follow-up letter indicated that, as a result of continuing inves-tigations, additional problems had been identified in the Ruskin dampers requiring further design modification and qualification testing. The additional problems experienced since the initial Ref. a) report are described in a supplemental 10CFR50.55(e) report, enclosed herewith.

This supplement describes modifications established and implemented by Ruskin Manufacturing Co. and which ultimately will be qualified on the basis of performance tests prior to and during site installation. A follow-up program to ensure proper implementation of these modifications has since been established at each SNUPPS jobsite and will be monitcod by cognizant site personnel.

The attached supplement is being treated as a final report under current 10CFR50.55(e) definition. In the event additional actions are found to _

THIS DOCUMENT CONTAINS gn, P00R QUALITY PAGES

SLNRC 80-24 May 16,1980 Page Two be necessary to fully resolve this matter, these will be communicated to the NRC. In the interim, further questions can be addressed to Mr. S. J.

Seiken, SNUPPS QA Manager, at (301) 869-8010. -

Very truly yours,

-h-< \ C Nicholas A. Petrick SJS:dck/A7

Attachment:

Supplement to the Final Report on Vertical Fire Dampers cc: Mr. J.A. Keppler, Director, Region III, USNRC 3 Mrc.KarbSeyfr.it. Director, Region IV, USNRC Mr. Victor Stello, Jr., Director, Office of Inspection and Enforcement, USNRC, Washington, D.C.

Document Management Branch, USNRC, Washington, D.C.

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l Supplement To The Final Report On Vertical Fire Dampers Supplied By Ruskin Manufacturing Company For The SNUPPS Project 4

J Bechtel Power Corporation .

Gaithersburg, Maryland May 8, 1980

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- SUPPLEMENT TO THE FINAL REPORT ON VERTICAL FIRE DAMPERS FOR THE SNLTPS PROJECT The Final Report on Vertical Fire Dampers for the SNUPPS Project was transmitted to the NRC by SLNRC 80-8 dated 2/15/80. The report indicated that the dampers would be modified by installing a No. 6 screw, a washer, a star lock washer, and a hex nut in the spring slot to prevent the spring from slipping out during closure of the damper.

This modification was subsequently judged to be unacceptable since No. 6 screws could become loose. As such, Ruskin developed an alternate design modification consisting of a small sheet metal clamp which wraps around part of the spring bracket locking the neck of the spring bracket slot.

(See attached Ruskin Drawings 5564 and 5566). Several dampers, which have been modified in accordance with the latest design modifications, have been tested and the design modification is judged to be acceptable for all vertical fire dampers.

During the investigation and modification of the vertical fire dampers at Callaway Jobsite, another problem associated with the closure of the small.

size vertical fire dampers (less than 9" high) was identified. This problem has been rectified by installing a sheet metal snap-in strip which holds the bottom blade of the small fire damper in proper orientation (see attached Ruskin drawings 5565 and 5567). Since the leading edge of the bottom blade is lower than the trailing edge, this modification assures complete and consistent closure of the small vertical fire dampers. All vertical fire dampers will be modified and operationally cycled, prior to and during installation, to confirm acceptability, l

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