05000530/LER-1998-003-01, Forwards LER 98-003-01 Re MSSV as-found Lift Pressures out- Side of TS Limits.Ler Suppl Provides Evaluation Findings from Unit 3 out-of-tolerance MSSVs Conditions Which Were Discovered During pre-outage Testing

Forwards LER 98-003-01 Re MSSV as-found Lift Pressures out- Side of TS Limits.Ler Suppl Provides Evaluation Findings from Unit 3 out-of-tolerance MSSVs Conditions Which Were Discovered During pre-outage Testing

ML17313A890
Person / Time
Site:	Palo Verde
Issue date:	04/13/1999
From:	Overbeck G ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17313A891	List: 05000530/LER-1998-003-01, Forwards LER 98-003-01 Re MSSV as-found Lift Pressures out- Side of TS Limits.Ler Suppl Provides Evaluation Findings from Unit 3 out-of-tolerance MSSVs Conditions Which Were Discovered During pre-outage Testing 05000530/LER-1998-003-02, :on 980902,discovered That MSSV as-found Lift Pressures Were Outside TS Limits.Caused by Bonding of Valve Disc to Nozzle Seat.Affected Valves Were Adjusted,Retested & Returned to Svc
References
192-01043-GRO-D, 192-1043-GRO-D, NUDOCS 9904220164
Download: ML17313A890 (6)

LER-1998-003, Forwards LER 98-003-01 Re MSSV as-found Lift Pressures out- Side of TS Limits.Ler Suppl Provides Evaluation Findings from Unit 3 out-of-tolerance MSSVs Conditions Which Were Discovered During pre-outage Testing

Event date:
Report date:
5301998003R01 - NRC Website

text

CATEGGRY REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9904220164 DOC.DATE: 99/04/13 NOTARIZED: NO DOCKET FACIL':STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH.NAME AUTHOR AFFILIATION OVERBECK,G.R.

Arizona Public Service Co.

(formerly Arizona Nuclear Power RECIP. NAME RECIPIENT AFFILIATION Records Management Branch (Document Control Desk)

SUBJECT:

Forwards LER 98-003-0l,per 10CFR50.73.Supplemental rept.

provides evaluation findings from plant out-of-tolerance MSSVs conditions which were discovered during pre-outage testing.

DISTRIBUTION CODE:

IE22T COPIES RECEIVED:LTR i

ENCL l

SIZE: 2 TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.

NOTES:Standardized plant.

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EXTERNAL: L ST LOBBY WARD NOAC POORE,W.

NRC PDR 1

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NOTE TO ALL "RIDS" RECIPIENTS:

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1 Commiimenf. fnnovatiora fnergy.

Palo Verde Nuclear Generating Station Gregg R. Overbeck Vice President Nuclear Production TEL 602/393-5148 FAX 602/3936077 Mail Station 7602 P.O. Box 52034 Phoenix, AZ85072-2034 192-01043-GRO/DGM/RAS April 13, 1999 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, DC 20555-0001

Dear Sirs:

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 3 Docket No. STN 50-530 License No. NPF-74 Licensee Event Report 98-003-01 Attached please find supplement 1 to Licensee Event Report (LER) 50-530/98-003 which has been prepared and submitted pursuant to 10 CFR 50.73.

This LER supplement provides the evaluation findings from the Unit 3 out-of-tolerance main steam safety valves (MSSVs) conditions which were discovered during pre-outage testing.

Ig The Unit 3 MSSV as-found liftpressures were in some cases greater than the tolerance allowed

/

by Technical Specification Limiting Condition for Operation 3.7.1.

During the evaluation of the Unit 3 MSSV testing results, APS determined that a potentially transportable condition existed and as a result, tested sele'cted Unit 1 and Unit 2 MSSVs.

Of the MSSVs tested as part,of the transportability review, one Unit 1 and one Unit 2 MSSV were also found to have as-found lift ~

settings outside TS limits.

APS engineering has implemented an'augmented testing program to gather additional data on MSSV performance and this LER supplement contains the results from the augmented testing that has been completed through February 25, 1999.

Concurrently, APS is evaluating industry operating experience for plausible actions that may assist us in improving MSSV performance and we may implement additional actions ifthey can be demonstrated to be effective.

8

U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Licensee Event Report 50-530/98-003-01 Page 2 4

The replacement of out-of-tolerance MSSVs and the augmented testing plan described in this LER supplement are being controlled in accordance with the PVNGS corrective action program.

As such, APS may modify these corrective actions as necessary to improve MSSV reliability and performance.

The corrective actions described in this LER supplement are not necessary to maintain compliance with regulations and therefore should not be considered regulatory

commitments

In accordance with 10CFR50.73(d),

a copy of this LER is being forwarded to the Regional Administrator, NRC Region IV.

If you have questions regarding this submittal, please contact Daniel G. Marks, Section Leader, Regulatory Affairs, at (602) 393-6492.

Sincerely, GRO/DGM/RAS/rlh Attachment cc:

E. W. Merschoff J. H. Moorman M. B. Fields INPO Records Center (all with attachment)