ML20011A813

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Evaluation of ANO-2 HPSI Pump Operability W/O Svc Water Cooling, Revision 1
ML20011A813
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 10/14/1981
From:
ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML20011A810 List:
References
NUDOCS 8111030244
Download: ML20011A813 (17)
v • d • e


Text

{{#Wiki_filter:- EVALUATION OF ANO-2 HPSI PUMP OPERABILITY WITHOUT SERVICE WATER COOLING REVISION 1 OCTOBER 14, 1981 8111030244 811021 PDR ADOCK 05000368 P PDR, u7

~' 4 ANO-81-2-0722 EVALUATION OF ANd-2 HPSI PUMP OPERABILITY WITHOUT SERVICE WATER COOLING i l.0 INTPODUCTION During an outage in September 1980 to investigate low service water. flow through the ANO-2 containment-cooling units, the high pressure safety injection-(HPSI) pump seal and bearing coolers which are f cooled by service water were inspected..This inspection revealed that the HPSI.Inunp small service water supply piping was plugged wiC1 silt and corrosion products such that little or no cooling i water flow was available. Since'that time, a series of tests and i analyses have been performed to determine what effect having no cooling water flow through these coolers has upon'the operability and reliability of the HPSI pumps. This~ report describes the. testing performed, summarizes test-results, explains the analyses performed ~ to extrapolate the measured data to the conditions'which would exist. t in an accident and draws conclusions about the 1"mp ' operability /re-i liability without service water flow. The revised report is issued to provide further clarification and additional information obtained since the original issue in December, j 1 [ 1980. t I i l k 1 1 3 k

2.0 TEST DESCRIPTION During November,1980 a series of ~ tests were run on the three ANO-2 i HPSI pumps to determine the effect of pump operation without cooling water flow through the bearing and seal coolers. During the tests ~ the three HPSI pumps were tested separately with the pump lined'up for recirculation to the refueling water tank. The service water supply was isolated and the pump was started. Temperature data was collected at 2-minute intervals for the first 10 minutes, 'g 5-minute intervals for the next 20 minutes, then at 30-minute intervals until stable 'aring and seal temperatures were achieved. The testing procedures specified that the test should be aborted and the pump secured if either bearing oil temperatures or seal water cooler temperatures should exceed 180 F. In all cases testing was not performed until it was confirmed that two HPSI trains were -e operable not including the pump being tested. The inboard and outboard bearing temperatures were monitored by temporary installation of local dial indicating thermometers in-stalled in the bearing lube oil reservoirs. The inboard and outboard seal water temperatures were monitored by local dial indicating thermo-meters installed in the seal water cooler vent connections. (See Figures 1 and 2). The ambient room temperature was measured with temporary thermometers located slightly above the outboard bearing housing. d 2

e ,~$f y 6o9&gm ~2Q; 2O G NIR RI AOE T EVRN N ) BRUO E D ETI V R - DSAT AE p/ \\ WORA RERA D RORN AREC E EBUO O PI P TTTI BLMD P AUAT NIEN A / IOTI C ( EC L PI ARMD EEEN SLTI O 6 OC 1 \\ s \\ ) y DRA^ [ / / RO EB TT L h / AU / WO ( L AR k EE SL j O O C / / O N f,'- I ? T C U E g P g i h \\ E \\ G R f s D A / \\' ET l l i PN C f \\ G PE I n\\ NR AV S IIE C D RORN AVUO ERTI [ } BEAT SRA DEEC RRPI A MD OLEN BI TI TO U O

FIGURE 2 HPSI RJMP BEARING DETAIL tT/d 50 g e &Rf*E%dadi$ ~ ;~.' O y 'Ahb(Nh(i$Ib (( M" kf Y' fjff f xxxxxx ) s ! /W b = 'b\\ % j f llIIIIII ' D / / / ~ _ - TilERM0 METER INSTALLED OPPOSITE OIL FEEDER O

r I 2.0 TEST DESCRIPTION (CONT.) Bearing race temperatures were measured using a contact pyrometer for comparison with oil temperature measurements at several times during the tests. These data were taken solely for information since all temperatures specifications are placed upon bearing oil temperatures. 3.0 TEST RESULTS Presented below are the initial conditions recorded during the test with the pump idle followed by the final conditions after all temp-eratures had stabilized. Temperature plots versus time during the tests are presented in Figures 3-8. Outboard Inboard Outboard Seal Inboard Seal Room

  • RWT Bearing ( F)

Bearing ( F) Water ( F) Water ( F) ( F) Temp ( Fl 2P89A Idle 69 69 69 66 68.6 75 Stable 122 101 142 130 68.6 75 2P89B Idle 65 66 62 66 75.4 76 Stable 168 90 126 103 74.3 16 2P89C Idle 61 62 68 57 73.4 74 Stable 142 112 126 119 87.3** 74 NOTE: 2P89B test performed on 11/9/80. 2P89C test performed on 11/17/80. 2P89A test performed on 11/20/80.

  • Thermometer was located just above the outboard bearing.
    • Reason for temperature rise due to smail room for 2P89C.

3 I;

l Bearing race temperature measurements indicated 4*F to 6 F higher than' bearing oil temperatures. A large deviation in temperature between the outboard and inboard bearings for 2P89B was observed during these tests. (The difference was 78*F versus 21 F for 2P89A and 30 F for 2P89C). The testing on 2P89B was performed immediately following maiatenance on its motor and the data indicated that the pump and motor.Say not have been ad-justed optimally causing a greater than necessary thrust loading. Since this maintenance occurred on 2P89B following the_ outage during which the Service Water flow blockage was discovered, these test re-sults were not used_for assessing operability, since it's condition was not considered representative of the period of concern. i t i l I i i l l t l l l l 4 e

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r 4 4.0 ANALYSES In order to assess the impact of loss of service water flow through the HPSI pump bearing coolers and seal water coolers during accident conditions, a simplistic analysis using conservative assumptions was performed. This analysis involved adjusting the fluid temperature of the pumpea fluid upwards from the test condition of ~75 F to a value of 200 F* for containment sump temperature or recirculation and apply-ing this difference to the seal water cooler tamperature. Additionally, the diffe ence in the measured room ambient an1 the expected room temp-erature during LOCA (115 F) was applied to both the bearing oil cooler and seal water cooler temperatures. Using this technique, the follow-ing worst case temperatures during post-LOCA cor 21, ons could be experi-enced, assuming no service water cooling flow: Outboard Bearing Inboard Outboard Seal Inboard Seal Temperature Bearing Temp. Water Temp. Water Temp. 2P89A 168 F -147 F 313*F 301 F 2P89C 170 F 140 F 279 F 272*F 2P89B Not anal *;7ed (see Test Results)

  • The original analysis used 250*F.

However, as indicated in Figure 15.1.13-1 of the FSAR, the actual sump temperature is predicted to be below 200 F at the time that recirculation begins (>20 minutes following the LOCA). i 5

The pump manufacturer (Ingersol-Rand) has recommended a bearing oil temperature limit of 160*F. This limit is based on the assumption that cooling water is being supplied to the bearing housings. Since the expected operating temperature during normal operation with cooling water.flou is nominally under 100*F, a temperature increase to 160 F would indicate a developing problem, thus the limit of 160 F. For bearings without cooling water, higher temperatures would be expec'ted during operation and a higher limit than 160 F is acceptable in this case. Data from bearing manufacturers and industrial experience has shown that bearing temperatures as high as 200*F (and in many cases higher) are not detrimental to pump operation. We chose to use 180 F as an upper bearing temperature limit during testing at ANO-2 to ensure timely termination of testing and as a flag to require further evaluation prior to resumption. However, we believe chat bearing temperatures up to 200 F and possibly higher are acceptable..- The highest bearing temperature experienced during these tests was 142*F on 2289C which was assumed to reach 170 F during post-LOCA 5 b ..g conditions. Although, heat transferred from the pumped fluid down the shaft to the bearings is not believed to be significant, since the temperature of the pumped fluid would be < 200 F,any contribu-tion due to this effect would not increase the bearing temperature to unacceptable levels. 6

The pump vendor, Ingersol Rand (IR), was asked to comment on the occurrence (loss of esaling water flow), the te st results, and the acceptability of 200*F bearing oil temperatures. IR confirmed AP&L's positon that no reason exista to believe that-the HPSI pumps would not have performed their intended function had an accident occurred during the time that service water flow was blocked. IR further agreed that 200 F bearing temperatures should not cause failure, but recommended that cooling water be maintained as a design feature to increase the long term reliability of the HPSI pumps. The pump seal manufacturer (Durametallic) prepared a test report for qualifying Dura seals in 1978. This report documents testing performed to prove operability of their seals during various nuclear plant design cor.ditions. When using 2.5 weight % boric acid, Dura-metallic projects a wear life of 4770 hours with nil leakage when seal temperatures are at 350 F. This case envelopes the ANO-2 HPSI pump test conditions when extrapolated to post-LOCA conditions. Therefore, no seal failure or increase in seal leakage would be expected if a loss of service water flow through the HPSI pump coolers were experienced coincident with a LOCA. 7

.c, e .e.-

5.0 CONCLUSION

S Based upon the testing performed at ANO-2'(runnin8 the HPSI pumps without service water flow through the pump bearing and seal water coolers) and the subsequent analyses, we have concluded that the HPSI pumps could have. accomplished their accident function in spite = of the loss of service water flow through their coolers which was discovered during the September 1980 outage. This analysis was confirmed independently by our NSSS vendor (Combustion Engineering). 4 1 i 4 i 8 ,,n-,- ,-,,,,,er -,--,,-,-,r- ,e,- -~,,w, -,=-,,--w ,-r--,,n. -,,,, -,,,,:}}

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