ML19323H852
| ML19323H852 | |
| Person / Time | |
|---|---|
| Issue date: | 12/03/1979 |
| From: | Matthews P NRC - TMI-2 BULLETINS & ORDERS TASK FORCE |
| To: | Reid R, Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| TAC-12391, TAC-12963, TAC-44632, NUDOCS 8006170103 | |
| Download: ML19323H852 (3) | |
Text
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yi,e,ffj NUCLEAR REGULATORY COMMISSION
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DEC 3 1973 MEMORANDUM FOR:
R. Reid, Chief Operating Reactors Branch No. 4, 00R A. Schwencer, Chief Operating Reactors Branch No.1, DDR FROM:
P. R. Matthews, Section Leader Systems Group B&O Task Force
SUBJECT:
AUXILIARY FEEDWATER PUtiP ENDURANCE TEST In our letters on APW System Requirements to all CE and Westinghouse operating plants, Additional Short Term Recommendation #2 recommended a 72-hour endurance test for all AFW pumps. Since that recommendation we have reviewed some partial test results from some B&W plants and consulted with H. Ripple of Franklin Institute regarding the necessity of a 72-hour test since the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> testing could result in conflicts with existing Technical Specification limit for outage of one AFWS train.
The test results we reviewed showed that the bearing temperatures reached an equilibrium within 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> following the pump reaching rated speed.
We, therefore, are relaxing the 72-hour test to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. The enclosed v revision to our earlier recommendation includes further criteria to ensure the 48-hour test is adequate.
Please notify the Westinghouse and CE licensees that the enclosed revision should be followed rather than our original recommendation.
P. R. Matthews, Section Leader Systems Group Bulltins & Orders Task Force
Enclosure:
As stated cc:
D. Ross T. Novak S. Israel G..vazetis P. O'Reilly I. Villaiva
.M*Ca pra W. Kane C. Liang W. LeFs~c 8006170 g3
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Revision to Recommendation No. 2 of " Additional Short Term l
Recommendations" Regarding Auxiliary Feedwater pump Endurance Test 1
The licensee should perform an endurance test on all AFW system pumps. The test should continue for at least 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after achieving the following test conditions:
- pump / driver operating at rated speed and
- pump developing rated discharge pressure and flow or some higher pressure at a reduced flow but not exceeding the pump vendor's maximum permitted discharge pressure value for a 48-hour test
- For turbine drivers, steam temperature should be as close to normal operating steam temperature as practicable but in no case should the temperature be less than 400*F.
Following the 48-hour pump run, the pumps should be shut down and allowed to cool down until pump temperatures reduce to within 20*F of their values at the start of the '48-hour test and at least 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> have elapsed.
Following the cool down, the pumps should be restarted and run for one hour. Test acceptance criteria should include demonstrating that the pumps remain within design limits with respect to bearing / bearing oil tempera-tures and vibration and that ambient pump room conditions (temperature, humidity) do not exceed environmental qualification limits for safety-related equipment in the room.
The licensee should provide a summary of the conditions and results of the tests. The summary should include the following: 1) A brief description of the. test method (including flow schematic diagram) and how the test
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s was instrumented (i.e., where and how bearing temperatures were measured).
- 2) A discussion of hcw the tes't conditions (pump flow, head, speed and i
steam temperature) compare to design operating conditions.
- 3) Plots af.
bearing / bearing oil' temperature vs. time for each bearing of each AFW pump / driver demonstrating that temperature design limits were not.
l exceeded. 4) A plot of pump room ambient temperature and humidity vs.
time demonstrating that the pump room ambient conditions do not exceed
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environmental qualification limits for safety-related equipment in the room. - - 5) A statement confirming that the pump vibration did not exceed allowable limits during tests.
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