ML19329E392
| ML19329E392 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 05/18/1978 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8006120709 | |
| Download: ML19329E392 (1) | |
Text
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.4 M AY 18 '.'.78 Docket No. 50-329 Docket No. 50-330 Consumers Power Company ATTN: Mr. Stephen H. Howell Vice President 1945 West Parnall Road Jackson, MI 49201 Centlemmen:
The enclosed IE Circular No. 78-04, is forwarded to you for information.
No written response is required. Should you have any questions related to your understanding of this matter, please contact this office.
Sincerely, James C. Keppler Director
Enclosures:
1.
IE Circular No. 78-04 2.
List of IE Circulars Issued in 1978 cc w/encis:
1
/ Central Piles Director, Nan /DPM THIS DOCUMENT CONTAINS Director, Nan / Don POOR QUAL.lTY PAGES 1
-- -- NSIC TIC Ronald Callen, Michigan Public Service Comission Dr. Wayne E. North Myron M. Cherry, Chicago
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5/16/78 omve,
NRC Form 318A (R2K) (5-76) NRCM 02040
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g U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III May 18, 1978 IE Circular No. 78-04 INSTALLATION ERRORS THAT COULD PREVENT CLOSING OF FIRE DOORS During a quality assurance audit, Georgia Power Company personnel discovered three types of installation errors on sliding fire door closers at the Hatch Nuclear Station that could have prevented the functioning of the doors.
The mechanism involved are D and H Pyromatic door closers manufactured by Masker (see attached drawing). Each unit is powered by a suspended weight which rotates a pulley arrangement to draw the fire door closed.
Closure is normally prevented by a fuse link cord which acts through a lever arm. This device, called the " fuse link anchor. hook " prevents rotation of the pulleys, unless the fuse links are severed by fire.
l The first improper installation was the replacement of the combustible j
fuse cords by "S-Hook" type chain. The replacement was necessary due to random failures of the original fuse link cord. However, the cord (or chain) passes through an opening in the case containing the mechanism, and the S links tended to spring open and catch on the edges of this opening. This problem was aggravated in some instances by the lack of guide bushings which are normally installed to facili-tate the passage of the chain through the opening.
Another error discovered was the mispositioning of the fuse link anchor hook. Following severance of the fuse link, the pulleys rotate clockwise and a correctly installed anchor hook is retated through an angle that permits the terminal eye on the end of the fuse link cord to fall free. This prevents the cord (or chain) and the remains of the fuse link assembly from becoming entangled in the rotating mechanism. However, some anchor hooks were found to be installed with the curved section extending to the left (relative to the front view shown). This position can cause the terminal eye to remain hooked during rotation, instead of falling free. These errors actually caused the jamming of fire door closers during tests that
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followed their discovery.
%,hThecorrectiveactionsweretoreplacethe"S"typechainwithflat hpk,0O sash chain, install the missing bushings and to correctly orient the th fuse link anchor hooks.
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m IE Circular No. 78-04 May 18, 1978 It is recommended that all holders of reactor operating licenses and ccastruction permits determine if any fire door closers of this type are installed in their facility (ies). If this is the case, it should be verified that they are installed in accordance with the manufacturers design and that improper installations, such as described herein, do not exist.
This circular is being distributed for information, and no reply is requested. If you require any additional information regarding this matter, please contact the director of this NRC Regional Office.
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IE Circular No. 78-04 May 18, 1978 LISTING OF IE CIRCULAR ISSUED IN 1978 Circular Subj ect First Date Issued To No.
of Issue 78-01 Loss of Well Logging 4/5/78 All Holders of Source Well Logging Source Licenses 78-02 Proper Lubricating 011 4/19/78 All Holders of for Terry Turbines Reactor Operating Licenses or Construction Permits 78-03 Packsging Greater Than S/16/78 All Holders of Type A Quantities of Reactor Operator Few Specific Activity Licenses, Construc-Radioactive Material tion Permits, Fuel for Transport Cycle, Priority I Material and Waste Disposal Licenses i
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