ML17298A541

Forwards Detailed Description of Cause of 820924 Failure of Joy Fan Blades on Vane Axial Fan,In Response to NRC 830204 Request.No Addl Physical Protection Features Necessary. Proposed Change to FSAR Table 3.5-3 Encl

ML17298A541
Person / Time
Site:	Palo Verde
Issue date:	09/01/1983
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Knighton G Office of Nuclear Reactor Regulation
Shared Package
ML17298A542	List: ML17298A541 ML17298A543
References
ANPP-27700-WFQ, NUDOCS 8309090300
Download: ML17298A541 (8)

Text

0 REGULATORY DEFORMATION DISTRIBUTION SY .M (RIDS)

ACCESSION NBR:8309090300 DOC.DATE~ 83/09/01 ,NOTARIZE/:, YES DOCKET FACIL:STN 50 528 Palo Verde Nuclear Statjons STN-50 529 Palo Verde Nuclear Statjons Unit Unjt li 2s Arjzona Publj Arizona Publj 05000528 05000529

, STN 50 530'alo Verde Nuclear Stationi Unit 3E Arizona Publ'i 05000530 AU TH. NAME,, Au THOR AFF ILI A T ION, VAN BRUNT.E.E. Ar izone Public Service Co.

RECIP.NAME REClPIEN] . AFFILIATION KNIGHTON G0 Licensina Branch 3

SUBJECT:

For war ds data'i led derzcr in)ionof pause of 820924 failur e of Joy fsn blades on vane axial fsnsin response to NRC'830204 r eauest.No addi phvsical pr otection features. neces v Proposed chanae -to FSAT Table 3".5 3 encl.

OISTRIOOTION COOE: 0001S TITLE: Licensina COPIES RECEIVES:LTR Submittal: PSAR/FSAR Amdts 8

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Arizona Public Service Company P.o. SOX 21666 ~ PHOENIX, ARIZONA 65036 September 1, 1983 ANPP-27700 WFQ/MAJ Director of Nuclear Reactor Regulation Attention: Mr. George Knighton, Chief Licensing Branch No. 3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2 and 3 Docket Nos. STN-50-528/529/530 File: 83-056-026; G.1.01.10

Reference:

1. NRC letter from G. W. Knighton, NRC to E. E. Van Brunt, Jr., APS, dated February 4, 1983. Evaluation of Potential Missile Hazards From Fan Blade Assembly Failure.

2. Palo Verde Nuclear Generating Station Project Evaluation-Deficiency Evaluation Report, No. 82-53 Revision 1, dated July 7, 1983. (Final Report)

3. Joy Manufacturing Company Report No. X-992, "Failure Analysis of 54-26-1770 Steel Rotor Returned on NPR-97152 from Palo Verde Nuclear Generating Station", dated October 22, 1982.

4. Bechtel's Material and,.Quality Services Trip Report, MGQS Log No. 280157, dated October 1, 1982.

5. The Waldinger Corporation "Verification Report" for Joy Fans, attachment to Bechtel Power Corporation Letter B/CVI-E-42846 to CVI Corporation, dated December 6, 1982.

Dear Mr. Knighton:

The NRC was informed on September 24, 1982 of the failure of the Joy Fan Blades on the vane axial fan (Tag No. 1-M-HCN-AOlB) installed in the Unit 1 Containment Building. An interim report (DER 82-53) was submitted to the NRC regarding this failure on October 25, 1982. Reference (1) requests Arizona Public Service Company (APS) to provide the following additional information concerning the above fan blade failure.

l. "A detailed description of the cause of the fan blade failure and the resulting missile."

2. "An evaluation of whether additional physical protection features, or other measures, are required for protection of safety-related equipment against internal missiles resulting from fan failures."

8309090300 83090i PDR 161DOCK 05000528 8 PDR

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ll Mr. G. W. Knighton Page 2 September 1, 1983 ANPP-27700 WFg/MAJ

3. "The extent to which the FSAR (Section 3.5.1.1 and 3.5.1.2) may need to be revised as a result of the above evaluation."

Reference (1) also states that if any of the requested information is to then the response to this be provided in the final report (DER-82-53) request may refer to the final report. The following is the APS response to the 3 items listed above.

1. "A detailed description of the cause of the fan blade failure and the resulting missile."

RESPONSE: The detailed description of the cause of the fan blade failure and the resulting missile can be found in the attached referenced final report (DER-82-53), Reference (2) and on pages 2-6 of the attached Reference (3), Joy Manufacturing Company Report No. X-992.

2. "An evaluation of whether additional physical protection features, or other measures, 'are required for protection of safety-related equipment against internal missiles resulting from fan failures."

RESPONSE: Per Reference (2), section II, in a review of all fans located within the containment, no structure, system or component necessary for safe plant shutdown was, nor could be, adversely affected by any internally generated rotating missile. Additionally, the evaluation of similar fans located outside the containment shows that the missiles from those fans will not adversely affect structures, systems or components required for safe plant shutdown. Therefore, any additional physical

'rotection features or other measures are not required for protection of safety related equipment.

3. "The extent to which the FSAR (sections 3.5.1.1 and 3.5.1.2) may need to be revised as a result of the above evaluation."

RESPONSE: Attached is a proposed change to FSAR Table 3.5-3. This change is described in Reference (2), section III, item (3) and is the only change that will be made to FSAR sections 3.5.1.1 or 3.5.1.2.

If you have any questions regarding this information, please call me.

Very truly yours, (Rem E. E. Van Brunt, Jr.

APS Vice President Nuclear Projects Management ANPP Project Director EEVB/MAJ/sp Attachment cc: E. A. Licitra (w/a)

A. C. Gehr J. Wermiel

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September 1, 1983 ANPP-27700 MFQ/MAJ STATE OF ARIZONA )

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COUNTY OF MARICOPA)

I, Edwin E. Van Brunt, Jr., represent that X am Vice President Nuclear Projects of Arizona Public Service Company, that the foregoing document has been signed by me on behalf of Arizona Public Service Company with full authority so to do, that T. have read such document and know its contents, and that to the best of my knowledge and belief, the statements made therein are true.

Edwin E. Van Brunt, Jr.

Swota to hafota ma this~/day of ~-"', 1983.

My Commission expires:

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