ML17298B243

Forwards Clarified Response to Question 1.1 on Reactor Coolant Pump Rept,Previously Addressed in . Diffuser/Suction Pipe Assembly,Diffuser Cavitation & Impellers Addressed

ML17298B243
Person / Time
Site:	Palo Verde
Issue date:	09/11/1984
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Knighton G Office of Nuclear Reactor Regulation
References
ANPP-30488-EEVB, NUDOCS 8409170161
Download: ML17298B243 (7)

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REGULATOR INFORMATION DISTRIBUTION STEM (RIDS)

ACCESSION'BR:8409 FACIL!STN 50 5?8 STN<<50<<529 STN 50 530 AUTH'INANE VAN BRUNT E ~ E ~

REC IP,, NAME KNIGHTONiG+W ~

170161 DOO ~ DATE ! 84/09/1 1

NOTARIZED:

YES Palo Verde Nuclear Stations Unit li Arizona Publi Palo Verde Nuclear Stations Unit ?i Arizona Publi Palo Verde Nuclear Stationi Unit 3i Arizona Publi AUTHOR AFFILIATION Ar izona Public, Service Co ~

RECIPIENT AFFILIATION Licensing Branch 3

DOCKET ¹ 05000528 05000529 05000530

SUBJECT:

Forwards clarified response to Question 1.1 on. reactor.

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Arizona Public Service Company P.O. SOX 21666

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PHOENIX. ARIZONA 65036 ANPP-30488-EEVB/TFQ/KLM September ll, 1984 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:

84-056-026'.l.01.10

Reference:

Letter from E. E.

Van Brunt, Jr,

APS, to G.

W. Knighton, NRC, dated May 23,

1984, ANPP-29574.

Subject:

Interim Report on Palo Verde Reactor Coolant Pumps.

Dear Mr. Knighton:

The attachment provides the clarified response to NRC Question 1.1 on the PVNGS Reactor Coolant Pump Report.

The initial response to this question was submitted in the referenced letter.

If there should be any questions, please contact me.

Very truly yours, APS Vice President Nuclear Production ANPP Project Director EEVBJr/KLM/sp Attachment cc:

E. A. Licitra (w/a)

A.

C.

Gehr (w/a) 8409S7016>

8409tS PDR ADOCK 05000528 A

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ANPP-30488 9/ii/84 STATE OF ARIZONA

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COUNTY OF MARICOPA )

I, A.

Donald B.

Karner, represent that I am Assistant Vice President of Arizona Public Service

Company, that the foregoing document has been signed by me for Edwin E.

Van Brunt, Jr.,

Vice President, Nuclear Production, on behalf of Arizona Public Service Company with full authority so to do, that I have read such document and know its

contents, and that to the best of my knowledge and belief, the statements made therein are true.

Donald B. Karner Sooth',to before me thie~lA day of y

e My Commission Expires:

My Commlsslon Expires April6, 49BT 1984 Notary Public

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At'tachment uestion:

Mill the demonstration testing be of sufficient time to su gect t e parts which previously failed to an adequate number of fatigue cycles?

Since the question was asked regarding the Reactor Coolant Pump (RCP) the answer will be addressed to the RCPs only and will be separated as follows to these categories:

1.

Diffuser/Suction Pipe Assembly 2.

Diffuser Cavitation 3.

Ioqellers Diffuser/Suction Pi e Assembl This assembly had various fastener fai lures and wear indications during the Hot Functional Test (HFT).

The preliminary 10CFR50.55(e) report addresses these failures and describes confirmatory testing at C-E Newington.

The final report will include the confirmatory test data.

Test g2 at C-E newington produced the inception of the failures noted during the HFT and Test g3 (modified parts) had no failures (See

p. I-33).

C-E does not believe that further testing is necessary and that the Demonstration Test at Unit 1 was not necessary for confirmation of this facet of the RCP design modifications.

However, the post test inspection will certainly search for failures similar to those which occurred during the HFT.

Diffuser Cavitation During Test g3 approximately 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> were spent attempting to induce cavitation.

None was detected.

(Note that during the initial cold hydro at Unit 1 (p II-9) significantly fewer hours caused cavitation damage).

There was no need for confirmatory testing during the Unit 1

Demonstration Test However, the post test inspection wi 11 be made for cavitation indications.

I

~lm el 1 ers Two impellers failed during HFT (See Figure A-1 in the preliminary report).

Of the operating hours, 26 and 0.1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> were single pump cold operation.

This is the condition wherein the impeller is subjected to the hi ghest stresses.

Impeller C003 (currently installed in Unit 1

pump 2B) was used for Tests II1 through g5 at C-E-KSB.

The total time of testing on this impeller is 423 hours0.0049 days <br />0.118 hours <br />6.994048e-4 weeks <br />1.609515e-4 months <br /> (250 hours0.00289 days <br />0.0694 hours <br />4.133598e-4 weeks <br />9.5125e-5 months <br /> at runout), this far exceeds the time at runout which caused the failures during the HFT.

Additionally, the Demonstration Test has increased the operating hours by about 740 of which 37 hours4.282407e-4 days <br />0.0103 hours <br />6.117725e-5 weeks <br />1.40785e-5 months <br /> were in the cold runout condition.

Pump 2B (containing impeller C003) will be disassembled and inspected following the Demonstration Test.