ML17305A403

Provides Addendum to 890626 Response to Violation Noted in Insp Repts 50-528/89-16 & 50-530/89-16.Units 1,2 & 3 Operating Procedures Revised to Minimize Air Entrainment by Providing Listed Guidance

ML17305A403
Person / Time
Site:	Palo Verde
Issue date:	11/14/1989
From:	Bailey J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
102-01522-JNB-T, 102-1522-JNB-T, NUDOCS 8911220300
Download: ML17305A403 (6)

Text

ACCELERATED DISIBUTION SYSTEM DEMONSTRATION REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

'ACCESSION NBR:8911220300 DOC.DATE: 89/11/14 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH. NAME AUTHOR AFFILIATION BAILEY,J.N. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Provides addendum to 890626 response to violation noted in Insp Repts 50-528/89-16 & 50-530/89-16.

DISTRIBUTION CODE: IE01D COPIES RECEIVED:LTR ENCL CJ SIZE:

TITLE: General (50 Dkt)-Insp Rept/Notice of Vio ation Response NOTES: 05000528 Standardized plant. 05000530 COPIES RECIPIENT COPIES 'ECIPIENT ID CODE/NAME LTTR E CL ID CODE/NAME LTTR ENCL PD5 PD 1 CHAN,T DAVIS,M. 1 INTERNAL: ACRS AEOD 1 AEOD/DEIIB AEOD/TPAD . 1 0 DEDRO NRR/DEST DIR NRR/DOEA DIR 11 NRR/DREP/RPB 10 NRR/PMAS/ILRB12 ~

NRR SHANKMAN,S NRR/DLPQ/PEB NRR/DREP/EPB 10 NRR/DRIS/DIR NUDOCS-ABSTRACT 1

1 1

1,.

1 OE BE N,J OGC/HDS1 1 EG FIL 02 RES MORISSEAU,D 1 RGNG~~E 01 EXTERNAL: LPDR NRC PDR NSIC NOTES:

D D

D NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOiVI Pl-37 (EXT. 20079) TO. ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL'NUMBER OF COPIES REQUIRED: LTTR 28 ENCL

Arizona Public Service Company P,O, BOX 53999 ~ PHOENIX. ARIZONA 85072-3999 102-01522-JNB/TDS/JJN November 14, 1989

~

JACK N, BAILEY VICE PRESIDENT NUCLEAR SAFETY AND LICENSING '.

S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

Reference:

Letter from W. F. Conway, Executive Vice President Nuclear, APS, to Document Control Desk, NRC, dated June 26, 1989 (102-01315-,WFC/TDS/JJN)

Dear Sirs:

Sub j ect: Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3 Docket No. STN 50-528 (License No. NPF-41)

STN 50-529 (License No. NPF-51)

STN 50-530 (License No. NPF-74)"

Addendum to Reply to Notice of Violation-528/89-16-01, 528/89-16-03, 528/89-16-04, 530/89-16-01, 530/89-16-03 File: 89-0 0-026 The referenced letter stated that APS had conducted tests to determine the actual flow conditions in the Reactor Coolant System (RCS) and Shutdown Cooling (SDC) systems. Additionally, the results of the testing were to be incorporated into the appropriate operating procedures.

This testing has been conducted in Units 1 and 3. This testing will be performed in Unit 2 during the upcoming refueling outage. APS is also performing studies using a scale model of the Palo Verde RCS to gather further data on vortex phenomena. The engineering analysis of the data gathered during the above testing is expected to be completed by May 31, 1990, and the appropriate operating procedures will be revised if ncessary by June 30, 1990.

In the interim, the Unit 1, 2, and 3 operating procedures, Shutdown Cooling Initiation (4XOP-XSIOl, X 1, 2, and 3 for the three units) have been revised to minimize air entrainment by providing the following guidance:

1) Only one SDC pump and only one SDC loop may be in operation when in a mid-loop condition (i.e., RCS level less than the 103 feet 1 inch elevation),

2) Time that the RCS level is below the 104 ft. elevation shall be minimized,

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NRC D'ocument Control Desk Page 2

3) The SDC loop will be periodically vented during operation to remove accumulated gas/air from system high points.

Additionally,,operating procedures have been written to specifically .address "RCS Drain Operations" (410P-1ZZ16 and 430P-3ZZ16), which includes items 1 and 2 listed above, and provides the following guidance:

SDC flow shall be maintained between 4000 and, 4100 gpm (this is the smallest useable band available based on the Technical Specification minimum flow rate of 4000 gpm).

Based on the testing performed in Units 1 and 3, APS believes that this guidance is sufficient to prevent a loss of SDC event due to air binding the SDC pumps as a result of vortexing/air entrainment.

The Unit 2 operating procedure, RCS Drain Operations (420P-2ZZ16), will be issued prior to mid-loop operations in Unit 2.

If you have any further question, please contact Timothy D. Shriver.

Very truly yours, JNB/TDS/JJN/kj cc: J. B. Martin M. J. Davis T. L. Chan T. J. Polich A. C. Gehr 2:SDC.JJN