High Pressure Coolant Injection Pump Vibration Issue

Wednesday, December 8, 20041:00 p.m. - 4:00 p.m.

U.S. Nuclear Regulatory CommissionOne White Flint North11555 Rockville Pike, Room 0-8B4Rockville, Maryland

Name Email Organization

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Enclosure 1

IF

M~ MUR~ Ine

Pilgrim NuclearPower Station

December 8, 2004

Is

Enclosure 2

HPC.I InmService Testing

Pilgrim Nuclear Power StationDecember 8, 2004

Meeting Purpose

| Summarize the basis for the Pilgrim

request concerning HPCI IST vibrationmonitoring

. Answer Staff questions about the basis

for Pilgrim's conclusions

Agenda

+ HPCI System Pump Configuration+ HPCI System Safety Function+ HPCI System IST Vibration Monitoring+ HPCI System Vibration* Code ReqUirements* Vendor Recommendations* Conclusion

HPCI Pump Configuration

P8H

030062D3

Main Pump Booster Pump

-Z,

HPCI PuMp Configuration

.--.

HPCI Pump Configuration

HP(C Function, Mission Time,and Operational Data

* Designed to pump water into the vesselin the event of a small break

o Delivers 4250 GPM @ 1120 to 150 psig

* Mission time about 16 minutes forlimiting break

* Operates intermittently during non-limiting small breaks.

@ Back-up systems: ADS, Core Spray,LPCI, RCIC

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H'PCI Function, Mission Time,and Operational Data

Equipment Qualification Profile time:5 hours

o Pump speed decreases from rated as vesseldepressurizes or operator controls flow

* Periodic Test (Surveillance) Duration:1 hour! quarter

e Cumulative operation since plant start:about 270 hours

X Periodic test demands are comparable toDBA requirements for operation at speed

HCI Pouu Vi b ration 0MonitoringProgram

GOHGOVGOA

P8HP8V.

P3HP3VP3A

P4HP4V

P7HP7V

P8HP8VP8A

Other points are monitored as part of Vibration Monitoringfor Preventive Maintenance and Balance

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HPCI Data November 24, 2004

1. .-IST - IST. P205 kPCI 042.5k

HFCI ISTR -pF3H Y3 BEARING-PUMP HORFZCVTAL~ ~ RouleiS~eectrurn

24-NOV-04 00:44:12

OVRALL& .8003 V-DGj PK . .7023

LOAD =4250.0flPM= 4012.RPS = 66.07b:

0.8i'

u

00.Ew

0.6 4x BOOSIER' I' PUIP RPt.

0.4 . 4.PNPS Cazuliatiiun 1oDelele DiscrtoW P&4ka 4x DO*ster Pump RPM:

(0.800)2 - (OA Levelf5

- (5.Gs2 _ 4x 1BP RPM Poikj'. - SubIrao Sq Values

lo.198)"s - U.44 IrvSec OA

0.2

SK btAIN Ix RPM ZX RPt.1 PUMPRPM

.7~ II I

oI. .10 i

ii A -. ., - p4 S 6 OrarFreq;Spuc:

2.017134.88

.66.5Frequuricy in Order

H CI Wata August 24, 2004IST ISr. P205 HPCI 442.5k

HPCI ISTl -P314 U3 13FARING-PU0.1P HORIZONTAL0- r - -

i

tl.l3

t

i

i

a

LI

:%

;:t

Routa Spectrum24-AUG.04 20:46:30

OWRAL.L= .9415 V-DGPK - .9331LOAD =4250.0RPFI = 398D.RPS - 66.3.

PNPS Ca!culation loDelolo Discrete Peak@ 4x Boossw Punip RPM:

0,942f) = (OA Levele- (0. 822)J = (Ox BP RPM Peaki'

Subtract Sq Values(CI.212)" G 0,4a l/Sec OA

4xc BOOSTERPUMP FRPU

.

!04

0.2Ix RPM7 2x

5xt.IAINPUMP RPM

U I

Frequeroy in Order4 S a Fteq:

Spec

2a017

.822

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HPCI Data May 259 994fiX X2D3. P205 HPCI TURD & PUMP

1.0 ~. X203 HPCI *P3H 43 GLARIRING-OUte Spectrum25-MAY94 0927:30

O'%MALL= .8515 'V-DG

LOAD u4250.0RPM- 400J.

: - RPU = fi.1300.6_t

8w

0.6 t. ;. '1~ 4x BOOSTERi FPUMP RPM

o Ic I

5x MAN iPUMP RPM '

PNPS Caalzulafion SoDelete DiGcrotae Peak

a x Booster Pump RPM:

(0.852)" - (CA LevelD* (0.710)f = (4x BP APRM Peak)j...... - Sibtract SC Valuos

(0.222)J r 0.471 lnfStc OAIII

ix RPMA 2x RPM IA I I

n .2 : i: I

oI , \ .11I0 Ii I

t 2 34

Frequenpry n Ctder

OtdrFruq:Spuce

z.01 s136.32.710

Code Requirements

OMa-1 996, ISTB 4.0:

Reference Values are establishedby the program. Relative andAbsolute Values are provided inISTB Table 5.2.1-1.

.'. 17,

Code Requirements

Note 1: ISTB 4.3 Reference Values, item (g)footnote for analysis:

""Vibration measurements of pumps may befoundation, driver, and piping dependent.Therefore, if the initial vibration readings arehigh and have no obvious relationship to thepump, then vibration measurements should betaken at the driver, at the foundation, and onthe piping and analyzed to ensure that thereference vibration measurements arerepresentative of the pump and that themeasured vibration will not prevent the pumpfrom fulfilling its function.

Code RequirementsNote 2:STB 4.6: New Reference Values:

"In cases where pump's test parameters are withineither the alert or required action ranges of TableISTB 5.2. 1-1 Table ISTB 5.2.1-2, Table ISTB 5.2.2-1,or Table ISTB 5.2.3-1, and the pump' continued useat the changed values is supported by an analysis, anew set of reference values may be established.This analysis shall include verification of the pump'soperational readiness. The analysis shall includeboth a pump level and system level evaluation ofoperational readiness, the use of the change inpump performance, and an evaluation of all trendsindicated by the available data. The results of thetest shall be documented in the record of the tests(see Article ISTB 7)."

Pilgrim Analysis

Pump performance Analysis* Analyzed source of vibration* Vibration of concern is attributed to the Booster

Pump and associated harmonics* Displacement due to vibration is lower than

clearance of bearings* Vibration concern is only at rated speed. Pump

operation time post accident is very short.* Adequate monitoring for degradation can be

accomplished with corrections for boosterpump induced vibration

Pilgrim Analysis* Pump performance Analysis (cont.)

* Corrected vibration data indicates HPCI MainPump is below required action rangeN No degradation of HPCI Pump performance willresult from the vibration and the HPCI Systemwill perform its design function

o Vendor Technical Notes were considered inthe analysis

a Vibration trending has shown nodegradation

e Intent of code requirements are met

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Vendor Recommendations forReducing Vibration

Verify correct dynamic alignment of allshaft couplings

Completed

Verify acoustic resonant condition frommeasured flow, RPM, water temperature,and vibration frequency

Completed

Wendorw Recoqmmendations forReducing Vibration

The Tech Note identified the followingpotential pump modifications (cont.):

Change the length of the interconnectingpiping

At Pilgrim this means shortening the cross over pipe. Thatis not practicable considering the as-built configuration

* Install an acoustic filter in theinterconnecting pipeNo proven design available. Not practicable consideringsafety related application

Vendor lRUP o endations forReducing Vibration

The Tech Note identified the followingpotential pump modifications (cont.):

Alter the mounted structural natural frequency ofthe injection pump

Not practicable to significantly stiffen the structure

* Change the number of vanes in the booster pumpimpeller

Most realistic of options. Costs approximately $487,000. Doesnot completely resolve issue. Will not improve systemperformance.

Conclusion

Historical pump trend data has been evaluated andconfirms that HPCI pump is operable anddegradation has not been observedProposed program using new Reference Valueswhich take into consideration as-built pumpconfiguration are within the scope of ISTB 4.6 and6.2 and provides an alternative for monitoring pumpperformance

* Proposed program meets the intent of the code andprovides an equivalent level of protection as thecode

* The vendor identified modifications areUnwarranted and are an undue burden