L-98-264, Provides Info to Supplement Relief Request PR-12,per 10CFR50.55a(a)(3).Request Is Needed to Facilitate Implementation of Unit 1 Third Ten Year IST Program

Provides Info to Supplement Relief Request PR-12,per 10CFR50.55a(a)(3).Request Is Needed to Facilitate Implementation of Unit 1 Third Ten Year IST Program

ML17229A873
Person / Time
Site:	Saint Lucie
Issue date:	10/09/1998
From:	Stall J FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
L-98-264, NUDOCS 9810150298
Download: ML17229A873 (12)

Text

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CATEGORY j.

REGULATu~Y INFORMATION DISTRIBUTIOdYSTEM (RIDS)

ACCESSION NBR:9810150298 DOC.DATE: 98/10/09 NOTARIZED: NO FACXL:50-335 St. Lucie Plant, Unit 1, Florida Power

& Light Co.

~

50R1389 St. Lucie Plant, Unit 2, Florida Power

& Light Co.

AUTH.NAME AUTHOR AFFILIATION STALL,J.A.

Florida Power

& Light Co.

RECIP.NAME RECIPIENT AFFILIATION Records Management Branch (Document Control Desk)

DOCKET I 05000335 05000389 4

SUBJECT:

Pz'ovides info to supplement relief request PR-12,per 980929 telcon with NRC.

DISTRIBUTION CODE:

A047D COPIES RECEIVED: LTR l ENCL )

S1EE:

I0 TITLE: OR Submittal: Inservice/Testing/Relief from ASME Code - GL-89-04 NOTES:

E RECXPIENT ID CODE/NAME PD2-3 LA GLEAVES,W INTERNAL: AC ILE CENT R 01 NUDOCS-ABSTRACT RES/DET/EXB EXTERNAL: LITCO ANDERSON NRC PDR COPIES LTTR ENCL 1

1 1

1 1

1 1

1 1

1 1

1 1.

1 1

RECIPIENT ID CODE/NAME PD2-3 PD AEOD/SPD/RAB NRR/DE/ECGB OGC/HDS3 RES/DET/EMMEB NOAC COPIES LTTR ENCL 1

1 1

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N NOTE TO ALL URIDSN RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD)

ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED:

LTTR 14 ENCL 13

Florida Powers Light Company,6351 S. Ocean Drive, Jensen Beach, FL34957 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 October 9, 1998 L-98-264 10 CFR 50.4 10 CFR 50.55a RE:

St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50-389 In-Service-Test Program Relief R uest PR-12 Su lement Pursuant to 10 CFR 50.55a (a)(3), Florida Power and Light Company (FPL) provides the attached information to supplement Relief Request PR-12.

The original request was submitted by FPL Letter L-98-243 dated September 21, 1998.

This information is provided based on a telephone conversation between the NRC and FPL on September 29, 1998.

The additional information is consistent with the guidelines contained in NRC Commission Proceedings, NUREG/CP-0152. The information is being provided to facilitate NRC review of Relief Request PR-12.

This Relief Request is needed to facilitate implementation of the Unit 1 Third Ten Year In-Service-Test Program.

The new program implements the ASME Section XI 1989 edition, which requires a

change in vibration monitoring from displacement measurement to velocity measurement.

Vibration readings utilizing velocity measurement devices on pumps running on mini-recirculation lines typically result in higher vibration readings than during their design service. In the case of the St. Lucie Unit 1 Safety Injection Pumps, the vibration xeadings taken with the pumps running on mini-recirculation exceed the absolute ALERTlevel, thereby requiring additional surveillance testing.

However, since pump run time using mini-recirculation line should be minimized, an alternative utilizing a higher ALERTvibration limitis proposed when the pumps are operated with mini-recirculation line and utilizing the ASME code required ALERT limits when the pump is run at fullor substantial flow during outages.

Please contact us ifthere are any questions regarding this submittal.

Very truly yours, J. A. Stall Vice President St. Lucie Plant JAS/GRM cc:

Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, St. Lucie Plant Attachment

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98i0150298 98i009 PDR ADQCK 05000335 PDR an FPL Group company

St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50-389 L-98-264 Attachment Page 1

RELIEF REQUEST PR-12 ADDITIONALINFORMATIONJUSTIFYING THE BASIS FOR RELIEF BACKGROUND The following information is provided to supplement Relief Request PR-12 submitted by Florida Power & Light Company (FPL) under FPL letter L-98-243 dated September 21, 1998. This information is provided based on a conference call between the NRC and FPL on September 29, 1998.

As requested, the additional information provided is consistent with the guidelines contained in NRC Commission Proceedings NU~REG/CP-0152.

The information is being provided to facilitate NRC review of the Relief Request PR-12.

This Relief Request is needed to facilitate implementation of the Unit 1 Third Ten Year IST Program.

The new program implements the ASME Section XI 1989 edition, which requires a change in vibration monitoring from displacement measurement to velocity measurement.

Vibration readings utilizing velocity measurement devices on pumps running on mini-recirculation lines typically result in higher vibration readings than during their design service. In the case of the St. Lucie Unit 1 Safety Injection Pumps, the vibration readings taken with the pumps running on mini-recirculation exceed the absolute ALERTlevel, thereby requiring additional surveillance testing. However, since pump run time using mini-recirculation lines should be minimized, an alternative utilizing higher ALERTvibration limits is proposed when the pumps aa: operated with mini-recirculation lines and FPL willutilize the ASME code required ALERT limits when the pump is run at fullor substantial flow during outages.

COMPONENTS Low Pressure Safety Injection Pumps 1A and 1B (8770-G-078, Sheet 130B)

SUPPORTING INFORMATION As discussed in NUREG/CP-0152, Code Absolute Vibration Requirements, there are four key components that the staff considers in evaluating alternative requests:

1) vibration history, 2) consultation with pump manufacturer or vibration expert, 3) attempts to lower the vibration through modification, and 4) performance of spectral analysis of the pump-driver system.

Vibration Histo These pumps are included in the plant "condition monitoring" program, therefore, several years of spectral analysis by the plant predictive maintenance group test results were available for review. From the spectral patterns it can be seen that, at minimum flow conditions, both pumps generate increased vibration levels. At low flow, vibration velocity levels at five and ten times running speed frequencies (5X/10X) are significantly increased due to elevated vane pass vibration

St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50-389 L-98-264 Attachment Page 2 since the velocity vector is not striking the volute at an optimal angle.

The increased vibration at the 2X frequency is a result of an abnormal pressure distribution in the volute that acts to load the impeller asymmetrically.

Also contributing the overall vibration increase is hydraulic broadband "spectral floor" energy generated by shock energy due to increased turbulence and internal recirculation flow.

Note that an anomaly occurred on April21, 1997, when relatively high vibration was experienced by the IB LPSI pump at the 1X frequency in the horizontal direction.

Based on a review of the data, it was determined that this resulted from a structural condition related to operation at elevated temperature.

The most likely cause was postulated to be piping and support system stiffness and natural frequency changes resulting from elevated temperatures.

Subsequent runs under similar conditions at non-elevated temperatures resulted in lower vibration.

Ex ert inion The spectral vibration data ofthese pumps was collected by plant predictive maintenance personnel experienced and trained in the performance monitoring of pumps and other rotating equipment.

The spectral data along with historical pump displacement and velocity data obtained to comply with IST requirements has been reviewed and evaluated by our onsite equipment vibration specialist. In addition, operation of the pump in low flow conditions has been discussed with the original equipment manufacturer.

The FPL predictive maintenance vibration specialist's conclusion based on the historical data, spectral analysis, and hands on data gathering is that there is no evidence ofpump deterioration or mechanical anomalies detrimental to pump performance and that the LPSI pumps are operating satisfactorily.

Corrective Actions As discussed

above, the pump vibration history data has been reviewed to ensure that no maintenance related anomalies were evident that could be corrected to improve performance.

The pump-piping configuration was also reviewed, however, changes to the pump/piping arrangement, including modification ofpump internals and installation of a full flow test recirculation line, would be costly and generally impractical.

Based on the data, the unacceptable levels ofvibration experienced during low flow conditions are a result of flow noise and pump dynamics that are not a function ofpump degradation.

The elevated levels of vibration are not evident at design flows, and therefore do not detract from pump availability or reliability at design flows. Also, the LPSI pumps meet the ASME vibration criteria during outage conditions (substantial flow conditions).

Accordingly, the need for substantial plant modification to install fullflow recirculation lines for quarterly surveillance is considered impractical.

S~MA a The results derived from spectral analyses are provided.

St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50-389 L-98-264 Attachment Page 3 PREBTCTIVE )IAIt)TEI!Al)CEI'FPL-PSl I'lgnt:SI. LUCIE Trnin:SAFETY It)J P I at: SI'cctru213 Trend Cquip: ln LPSI PUtlP Lcc:3-YV Odeg 0<g<n:

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