ML20205N861
| ML20205N861 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 03/31/1987 |
| From: | Gagliardo J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Withers B WOLF CREEK NUCLEAR OPERATING CORP. |
| References | |
| NUDOCS 8704030120 | |
| Download: ML20205N861 (2) | |
See also: IR 05000482/1987001
Text
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MAR 311987
In Reply Refer To:
Docket: STN 50-482/87-01
Wolf Creek Nuclear Operating Corporation
ATTN: Bart D. Withers
President and Chief Executive Officer
P. O. Box 411
Burlington, Kansas
66839
Gentlemen:
Thank you for your letter of March 20, 1987, in response to our letter and
Notice of Violation dated February 19, 1987. We have reviewed your reply and find it
.
responsive to the concerns raised in our Notice of Violation. We will review
the implementation of your corrective actions during a future inspection to
determine that full compliance has been achieved and will be maintained.
Sincerely,
OrlpJm:I Sfgned Dy
,
J. E. G gilardo
J. E. Gagliardo, Chief
Reactor Projects Branch
cc:
Wolf Creek Nuclear Operating Corporation
ATTN: Otto Maynard, Manager
of Licensing
P. O. Box 411
Burlington, Kansas
66839
Gary Boyer, Plant Manager
Wolf Creek Nuclear Operating Corporation
P. O. Box 411
Burlington, Kansas
66839
Forrest Rhodes, Vice President, Nuclear Operations
Wolf Creek Nuclear Operating Corporation
P. O. Box 411
Burlington, Kansas
66839
Kansas Radiation Control Program Director
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NUCLEAR OPERATING
CORPORATION
March 20,1987
T 1@ s:M w%
U. S. Nuclear Regulatory Comission
W 2 51987
ATIN: Document Control Desk
Washington, D. C.
20555
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tatter: WM 87-0099
. _ . . .
Re:
Docket No. STN 50-482
Ref:
Ictter dated 2/19/87 from JEGagliardo, NRC, to
BDWithers, WCNOC
Subj:
Response to Violation 482/8701-01
Gentlemen:
Attached is a detailed response to violation
(482/8701-01) which was
documented in the Reference.
The violation concerned an inproperly routed
flexible conduit which rendered a fire danper inoperable.
If you have any
questions concerning this matter, please contact me or Mr. O. L.
Maynard of
my staff.
Very truly yours,
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Bart D. Withers
President and Chief
Executive Officer
BDW:wbb
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Attachment
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Attachment to Mt 87-9999
Page 1
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' Violation (482/8791-91):
Fire Danger Not Operable As Required By
Technical Specifications
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Finding:
requires
that,
"All fire barrier penetrations
(walls,
floor / ceilings, cable tray enclosures, and other fire barriers) separating.
safety-related fire areas or separating portions. of redundant systems
.inportant to safe shutdown within a fire area and all sealing devices in
fire-rated assembly penetrations (fire doors, fire windows, fire dampers,
i
cable, piping, and ventilation duct penetration seals) shall be OPERABLE."
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Contrary to the above, on January 29, 1987, the NRC inspector observed that
the flexible conduit to the electro-thermal link in Fire Danger GK GD959 was
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routed under the danper fire curtain and could possibly interfere with the
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operation of- the fire curtain and prevent 'it from fully closing and
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rendering the danper inoperable. On February 3,
1987, the licensee tested
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the fire danper by melting its thermal link and the danger curtain failed to
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fully close as required, thereby verifying that Fire Danper GK GD959 was
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Reason For Tne Violation:
Fire danger GK GD959 is a vertical danger operated by an electro thermal
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link which is controlled by a signal from a Halon System Control Panel.
It
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is located in a wall duct separating Switchboard Room 4 and Battery Room 4
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on the 2916 foot elevation of the Control Building.
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'Ihe dapper had been cycled on December 1,
1986, as part of an 18 month
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surveillance to demonstrate Halon System operability.
The cycling
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acconplished by uncrinping the damper S-hook, disconnecting the electro
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thermal links, and allowing the danper blades to drop.
It is believed that
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the flexible conduit was installed inproperly during restoration from this
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testing through personnel error.
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Had a fire occurred in the area while the danper was inoperable,
the Fire
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Detection System would have generated an alarm in the Control Room,
thus
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ensuring prmpt Fire Brigade response to mitigate the consequences of the
fire.
Additionally, the inoperable danper would not have prevented Halon
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Systen discharge into the Switchboard Roam.
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Corrective Steps Which Have Been Taken and Results Achieved:
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On January 29,
1987, the potential for flexible conduit interference with
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closure of danper GK GD959 was identified by a NRC Resident Reactor
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Inspector.
In order to determine the operability of the danger, on February
3,
1987, maintenance personel tested the danper by actuating the electro
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thermal link.
The test confirmed that the flexible conduit did interfere
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~ Attcchment to WM 87-0099
Page 2
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with damper closure.
'Ihe maintenance personnel then notified Control Room
personnel of' the failure, and the control room personnel ordered that the
da@er be closed and maintained closed pending rework.
In the closed
position, the damper fulfilled its intended fire protection function.
Additionally,
an inspection of the other similar dagers controlled by
electro thermal links was conducted.
During this inspection four
(4)
danpers
were
identified
ar
being susceptible to flexible conduit
interference.
Three of these < mpers were Technical Specification required
These danpers were also closed and maintained closed pending
rework.
Corrective Steps Which Will Be Taken To Avoid Further Violations:
In order to prevent flexible conduit interference with damper closure,
the
design of the conduit installation to the electro thermal links is being
changed for the dampers controlled by electro thermal links.
Plant
Modification Request No.
02009 involves the addition of a 90 degree
connector between the flexible conduit and the electro thermal link pigtails
outside of the damper enclosure to ensure that they cannot be trapped under
the damper blades upon closure.
The Date When Full Conpliance Will Be Achieved:
Plant Modification Request No.
02009 will be fully inplemented by July
1,
1987.
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