ML20010C063

Interim Deficiency Rept Re Buffalo Forge Heating,Ventilation & Air Conditioning Fan Shrouds,Initially Reported 810611.New Drawings Being Drafted Outlining Field Mods.Final Rept by 820430.Also Reported Per Part 21

ML20010C063
Person / Time
Site:	Waterford
Issue date:	08/10/1981
From:	Aswell D LOUISIANA POWER & LIGHT CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, W3K81-0285, W3K81-285, NUDOCS 8108190072
Download: ML20010C063 (4)

Text

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P O W E R & L i G H T! P O BOX 6008 142 DELAACNCE STREET

[504) 366-2345

• NEW ORLEANS LOUISIANA 70174 U IL8 f[ bV P

D L ASWELL Vce Presh Pow Pmsuction Auguct 10, 1981 Q-3-A35.07.34 Q-3-A35.02.01 W3K81-0285 Mr. K. V. Seyfrit, Director, Region IV U. S. Nuclear Regulatory Commission Of fice of Inspection and Enforcement Gil Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Interim Report of Significant Construction Deficiency No. 34 "Buf falo Forge IIVAC Fan Shrouds; Possible Inadequate Design for Shrouds to Serve as Fan Blade Missile Barriers"

Reference:

Telcon - L. L. Bass (LP&L) to R. C.

Stewart (NRC) on July 8, 1981

Dear Mr. Seyfrit:

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

If you have any questions, please advise.

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Director Office of Inspection & Enforcement j f U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (with 15 copies of report)

2) Director office of Management Information and Program Control

d. S. Nuclear Regulatory Commission Washington, D. C.

20555 (with 1 copy of report) 8108190072 810010 PDR ADOCK 05000382 S

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t LOUISIANA POWER & LIGHT COMPAhT WATERFORD SES UNIT NO. 3 Interim Report of Significant. Construction Deficiency No. 34

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INTERIM REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY No. 34

" BUFFALO FORGE hVAC FAN Si!ROUDS; POSSIBLE INADEQUATE DESIGN FOR SilROUDS TO SERVE AS FAN BLADE MISSILE BARRIERS" INTROLUCTION This report is submitted pursuant to 10CFR50.55(e).

It describes a de-ficiency in the design of the HVAC fan shrouds supplied by Buffalo Forge.

This problem is considered reportable under the requirements of 10CFR50.

55(c). This problem has been ider.tified to the Nuclear Regulatory Com-mission by Buffalo Forge Company under 10CFR21.

DESCRIPTION OF PROBLEM on June 11, 1981, Buffalo Forge Company notified Ebasco Services, Inc.,

that pursuant to 10CFR21, the Nuc1 car Regulatory Commission had been no-tified of a deficiency in the thicknessas of the fan shrouds supplied to Waterford 3.

New methods af calculation indicate that thicker fan shrouds are required.

The fan shrouds as supplied on some of the fans would not contain a thrown fan bleMc.

This condition, if Icft uncorrected, could jeopardize the functiotal operability of other nuclear safety-related equipment in the vicinity.

At Waterford 3, there ce 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:

Tag Nun.ber Buffalo Forge Co.

Identification Number All-13 76J6052-53 AH-30 76J6075-76 E22 76J6570-71 S6 76J6572-73 E20 76J6574-75 E48 76J6582 E16 76J6585-88 E17 76J6643-44 Seventeen (17) shrouds that fall into this group of inadequately designcd shrouds have been installed. Of this group, six (6) are safety-related/

seismic.

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

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. This missile damage could lead to loss or degradarion of the affected safety-related equipment.

Thus, the equipment may be unable to carry out its re-quired safety function.

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

CORRECTIVE ACTION The Buf f alo Forge Company is proceeding with the draf ting of new drawings outlining field modifications required for the fans in question.

Drawings are expected to be mailed to Ebasco no later than August 7, 1981.

Corrective action will be completed and a Final Report submitted on or before April 30, 1982, i

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