ML20079J401

Final Rept of Significant Const Deficiency 34 Re Buffalo Forge HVAC Fan Shrouds W/O Capability to Contain Fan Blade Missiles.Mods to Fans Completed on 821112.Reported by Manufacturer Under Part 21

ML20079J401
Person / Time
Site:	Waterford
Issue date:	12/15/1982
From:	Maurin L LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, W3I82-0123, W3I82-123, NUDOCS 8212280203
Download: ML20079J401 (3)

Text

p LOUISIANA 24a OnAnONOc Srnter P O W E R & L 1 G H T! P O BOX 6008

• NFW OnLEANS. LOUISIANA

• 1504) 366 70174 2345

$fuS$bsE December 15, 1982 Lv uAumv voce Presxtent NucWar Operations W3I82-0123 Q-3-A35.07.34 Mr. John T. Collins, Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency No. 34

" Buffalo Forge HVAC Fan Shrouds; Possible Inadequate Design For Shrouds to Serve as Fan Blade Missile Barriers" Final Report

REFERENCE:

LP&L Letter W3I82-0033 Dated September 15, 1982

Dear Mr. Collins:

In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No.34, " Buffalo Forge HVAC Fan Shrouds; Possible Inadequate Design for Shrouds to Serve as Fan Blade Missile Barriers."

If you have any questions, please advise.

Very trulf yours, ll/7Zsaus hOS f L. V. Maurin LVM/WAC:keh toTtD

@_M Attachment M

$$ cc: 1) Director 3) E. Blake

@@ Office of Inspection and Enforcement Xg U. S. Nuclear Regulatory Commission O Washington, D. C. 20555 O$ (with 15 copies of report)

Ow OM U ta- 2) Director 4) W. Stevenson

@@G Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (with I copy of report)

+-

FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 34 1 BUFFALO NRCE HVAC-FAN SHROUDS; POSSIBLE INADEQUATE DESIGN  !

FOR SHh0UDS TO SERVE AS FAN BLADE MISSILE BARRIERS INTRODUCTION "

r This report is submitted pursuant On 10CFR50.55(e) . It describes a deficiency  ;

in the design of the HVAC fan shrouds supplied by Buffalo Forge. This problem '

is considered reportable under the requic-ments of 10CFR50.55(e).

This problem has been identified to the Nuclear Regulatory Commission by 4

Buffalo Forge Company under 10CFR21.  ;

i

. DESCRIPTION f On June 11, 1981, Buffalo Forge Company notified Ebasco Services, Jnc., that i pursuant to 10CFR21, the Nuclear Regulatory Commission had been notifici '

of a deficiency in the thicknesses of the fan shrouds supplied to Waterford 3.

New methods of calculation indicate that thicker fan shrouds are required. 'i" The fan shrouds as supplied on some of the fans would not contain a thrown fan blade. This condition, if left uncorrected, could jeopardize the  ;

functional operability of other nuclear safety-related equipment in the +

vicinity.  !

At Waterford 3, there are eight (8) types of fan shrouds manufactured by Buffalo Forge that did not satisfy design requirements. The Buffalo Forge  !

identification numbers and corresponding' tag numbers affected are:  ;

Buffalo Forge Co. .

Tag Number Identification Number  !

AH-13 76J6052-53 AH-30 76J6075-76 >

4 E22 76J6570-71  ;

S6 76J6572-73 ,

E20 76J6574-75 i E48 76J6582  ;

E16 76J6585-88 E17 76J6643-44  ;

i Seventeen (17) shrouds that fall into this group of inadequately designed shrouds have been installed. Of this group, six (6) are safety-related/

seismic. i SAFETY IMPLICATIONS If a fan blade penetrates its shroud and becomes a missile, other safety- l related equipment in the area could be damaged by this missile. '

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-Page 2 This missile damage could lead to loss or degradation of the affected safety-related equipment. Thus, the equipment may be unable to carry out its required safety function.

Therefore, the inadequate missile barrier design of the shrouds would adversely affect the safety of the plant if left uncorrected.

CORRECTIVE ACTION Buffalo. Forge Co. identified seventeen (17) fans which required modifications in order to prevent missiles from penetrating the fan housing. Subsequently, six (6) fans were eliminated due to their being located within cabinets of double wall cor.struction that were calculated to contain a thrown fan blade after it penetrated the fan scroll. Two (2) more fans were deleted from the group after protection from internally generated missiles was no longer necessary due to relocation of nuc1 car safety-related equipment in the final design.

Buffalo Forge Co. submitted design modifications to Ebasco Services Incor-porated for approval and supplied the required material for the nine (9) remaining units.

DCN-NY-HV-125 was issued to delineate the necessary field corrective action.

All corrective action was completed, inspected and accepted as of November 12, 1982.

This report is submitted as a Final Report.

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