ML20052C035
| ML20052C035 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 04/21/1982 |
| From: | Root R WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Faulkenberry R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, G1-82-151, GO1-82-0151, GO1-82-151, NUDOCS 8205040289 | |
| Download: ML20052C035 (3) | |
Text
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l' Decket Nos. 50-460/513 i y g
- p. t uu 50.55(e) Report g
Washington Public Power Supply System c,,,
P.O. Box 968 3000GeorgeWashingtonWay Richland, Washington 99352 (509)372-8Q00 NI12: ;#
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April 21,1982 G01 0151
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Nuclear Regulatory Commission Y
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Region V d
's 1450 Maria Lane, Suite 210
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Walnut Creek, California 94596
{ ;"nv', _ 01992h L2 Attention:
Mr. R. H. Faulkenberry r; i ' g rr,a Chief, Reactor Construction L,
,.J " W 'g Projects Branch
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Subject:
NUCLEAR PROJECTS 1 AND 4 REPORTABLE 10CFR50.55(e)
BUFFALO FORGE FAN HOUS'NG MISSILE PROTECTION
References:
1)
Telecon CR Edwards, Supply System to PP Narbut, Region V, Nuclear Regulatory Commission dated August 24, 1981 2)
BFUE-81-5017, dated June 11, 1981, JA Cownie to DW Mazur 3)
UEWP-81-736, dated August 28, 1981, HC Grau to GK Dyekman 4)
G0-181-321, dated September 25, 1981 DW Mazur to RB Faulkenberry 5)
G0-1-82-0020, dated January 18, 1982, DW Mazur to RB Faulkenberry In reference 1) the Supply System informed your office of a potentially reportable condition under 10CFR50.55(e).
In reference 2) the manufacturer of the subject fans, Buffalo Forge Company, identified to the Supply System a design deficiency associated with the missile protection character-istics of the fans supplied to WNP-1/4 under the guidelines of 10CFR21.
In references 4) and 5) the Supply System provided your office with interim reports on the subject deficiency.
Attachment A to this letter, provides a restatement of the problem and an update on our planned corrective action. This letter is also our formal notification to you that we have decided to report this deficiency as a Reportable Condition under 10CFR50.55(e). Engineering has not performed an indepth analysis as to what safety related equipment (SRA) would be affected by a fan failure; rather, it has been decided to modify the fan housings to protect adjacent SRA equipment and personnel in the event of a fan failure.
Therefore, as a result the Project is unable 820504C93j ara
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I,O R. H. Faulkenberry April 21, 1982 Buffalo forge Fan G01-82-0151 Page 2 to assess the total overall safety significance of the deficiency and has determined that it should be reported to your office as though it were a fully reportable condition. The completion date for the fan housing modifications has not yet been e.ttablished because the design fix is still being negotiated with the manufacturer.
We will continue to provide your office with quarterly interim status reports on the progress of the subject condition.
If you have,any-q stion or desire further information, please advise, m
R. W. Root i
Acting Program Director RWR:MER:lm l
Attachment cc: CR Bryant, BPA/399 EW Edwards, Bechtel/860 V. Mani, UE&C/896 V. Stello, Director of Inspection, NRC:
A. Toth, NRC FDCC/899 O
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c ATTACHMENT A WNP-1/4 DOCKET NOS. 50-460 AND 50-513 REPORTABLE CONDITION 10CFR50.55(e)
MISSILE PENETRATION FOR BUFFALO FORGE FANS BACKGROUND Buffalo Forge Company, notified the Supply System on June 10, 1981 of a deficiency in the fan housing design in regard to missile penetration, in that, it did not conform to the specification requirements. The manufac-turer, Buffalo Forge Company, has reported the design deficiency to the NRC under the guidelines of 10CFR Part 21.
DESCRIPTION OF DEFICIENCY The failure of the fan housing to stop missiles generated in the radial direction in the event of interior component failure, including wheel and motor, could damage safety related (SRA) equipment.
It has been determined that safety related equipment is located in and around the area where these fans are located. Rather than parform a failure analyses to determine what SRA equipment could be adversely affected by a fan failure it was decided to rework the fan housings to preclude any damage other than to the fan itself, this then renders the safety significance indeterminate.
STATUS OF CORRECTIVE ACTION On December 2 and 3, 1981 two Buffalo Forge Engineering representatives were at the WNP-1/4 jobsite to discuss the subject design deficiency.
Discussions were held with Supply System and UE&C Engineering for the purpose of determining the best design fix. Rather than proposing one generic solution applicable to all fans, each cf the fans was reviewed individually to determine the most appropriate corrective action based on the fans location within the plant.
It has been determined that there is a combined total of twelve (12)
Buffalo Forge Fans in safety related areas within both the Containment and General Services Building (GSB) for each unit.
To protect the integrity of the safety related equipment within the immediate area of the fans and assure personnel safety, corrective actions have been proposed by Buffalo Forge and are under review by the A/E. Because the fans are "Vaneaxial" type, the manufacturer proposes to mount reinforcing plates on the fan housing over the fan wheel area. A determination as to the acceptability of this proposed fix should be made by July 1, 1982.
I A completion date for the actual work has yet to be determined.
The Project is currently negotiating with the manufacturer to have~the correc-l tive actions implemented.
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