ML18045A293

Rept on Endurance Testing of Auxiliary Feedwater Pumps.

ML18045A293
Person / Time
Site:	Palisades
Issue date:	07/01/1980
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML18045A292	List: ML18045A291 ML18045A293
References
TASK-10, TASK-RR NUDOCS 8007030251
Download: ML18045A293 (16)

Text

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REPORI' ON THE, ENDURANCE TESTING

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CONI'ENTS I. Introduction II. Description of Test .

Attachment 1- Testing Flow Path Attachment 2 - Steam Turbine Driver Attachment 3 - i-.foto:r: and Stearn Driven Auxiliary Feedpumps Attachment 4 - Auxiliary Feedpump .r.t:>tor Driven Pump Total Head and Bearing Vibration ,. :**

Attachment 5 - .M::>tor Driven Auxiliary Feedpump Bearing Tanperature

• Attachment 6 - *Roan TernJ?"'...rablre and Humidity During .r-btor Driven *;:* ...

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Auxiliary**Feedpurnp Test * * *. *._:*_.: ..* *.

Attachment 7 - Auxiliary Feedpump Turbine Driven Pump Total Head and Bearing Vibration *.*

Attachment 8 -:-- Turbine Driver and Feedpump Bearing Temperature *:*. :* .

Attachment 9 - Roan Temperature and Humidity During Turbine Driven

. Auxiliary Feedpump Test Attachment 10 - Pump Characteristic.Curve

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I. Introduction Thenotor driven and turbine driven auxiliary feedpumps were tested at the Palisades Nuclear Plant as conmitted to the Nuclear Regulatory

• canmission in a letter dated December 11, 1979, fran ~-m:uston to the NRC, *

Subject:

Auxiliary Feedwat.er*Long~-and ..Short* Tenn. Requirements~ -

The pumps were test.ed to danonstrate that they remained witl1in design**

lirnits--over a duration of time.. . .. ~--' ---.*------~ ~--,7 IL- Description* of Test * * **

The auxiliary feedpumps were tested by Special Test Procedure T-131 AjB during the period of May 29 through June 3, 1980. The plant was returning to power after a refueling outage wi.th*the reactor between 60 - 90% full power during the testing interval.  :.: ' .

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The steam driven pump was tested for a sixty (60} hour duration and.

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then the motor driven pump for a forty-eight {48) hour duration. . .' '.

Their system alignment for the test was the normal f la.v path to the steam generators as shown in Attachment 1.

• Each pump fed both steam generators at a rate of~approximately fifty (50} gallons per minute *.**. -.;,

. to each generator plus a certain amount. of flow through its recircu- ".;_**...

• lation piping back to the condensate storage tanks. The pumps were ..... *.

ran for their specified amount of time; stopped to cooldovm for ._;-.,

eight-hours and t.lia.11 restarted . for. an hour or. nore~ During the testing interval the following :Parameters werenonitored and recorded as ...or.:-~~-*-~ : .. .

.applicable: ,

1. Pump bearing terrperature

2. Pump vibration J;.. - - Pump speed

4.

• Steam turbine inlet pressure

5. Turbine bearing temperature

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6. Motor amps '.

7. Pump. di ffe......--er.tial pressure

8. Roan temperature -

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• Rcx:xn humidity

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All-data was taken with portable instrumentation except turbine inlet pressure, notor amps, and pump differential pressure which were taken from installed plant instrumentation.-. Attachment 2 and 3 illu-strate bearing terrperature and vibration measure:nent locations.

III. Summary-of Test Results Acceptance Criteria for Test  : . . .

1. Pump total head based on the nonthly Technical.Specification Surveillance Proced\.ire established reference value for total head afid ASME B & PV code,Section XI, subsection IWP limiting values for acceptable pump perfonnance. *

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2. Pump vibration based on the nonthly Techi1.ical Specification Surveillance Procedure established reference value for vibration and ASME B & PV code,Section XI, subsection IWP, limiting values for acceptable pump perfonnance.

3. Roan temperature less than the heating and ventilation design of 110°.F for the roan. -- - :.: * - ** - * * * - .. *- _:.,. ... -~ > *-

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Z..btor Driven Auxiliary Feedpurnp The.motor driven auxiliary feedpurnp acceptable operating range for total head as established by the nonthiy Technical Specification

• Surveillance Procedure is 1397< ~ P< 1576 psid. The pump operated well within this limit during the forty-eight hour run (reference Attachment 4)

• The pump was restarted for an hour run time after an eight hour cooldown period. Pump total head was calculated to be between 1262.9 to 1282.9 psid which was below the low limit for pump head. However, this was explained by the higher flow rate during the restart period. During the eight hour cooldown period the auxiliary f eedwater controls were returned. to their norina.l flow rate setting of 150 gpm to each generator. When the punp was restarted the .. flowrate was. approximately 300 gpn to the steam generators plus

• an approximate 7 5 gpn through the pumps mininu1m flow recirculation line*; .:.;.: This approximately doubles the flow rate of the forty-eight -;.: ..

hour run.

For a flow rate of 375 gpn on the pumps characteristic curve (reference Attachment 10) the pumps total head is 1296 psid. . Comparing this ..

total head with the test results indicates the pump perfai:rrecCas . * .. -....

designed.

The pumps acceptable bearing vibration as established by the monthly Technical Specification Surveillance Procedure was to be less than

4. 2 mils. The pump operated well below this *limit throughout the duration of. the test*.. (Reference Attachment 4).

• The pumps Jy::>..,armg oil temperatures were less than 132°.F throughout the test. (Reference Attachment 5) This was below the vendors operating caution value of 18o0 c.

Attachment 6 plots the roan temperati.~re and humidity for the duration of the test. The maximum values were ? 45°( for temperature (exceeded t.hennareters rang_e) and *45% relative humidity. The temperature exceeded the test acceptance criteria: value of llO°F*. However,

• this value was the design temperature value for the heating and ventilation system for the roan and not the design limit for the safety related equipnent within the roan.

• For instrumentation outside of containment the purchase specification design upper limit for temperature is 50°C + 5o and for humidity it is 80 + 2%. The piping, canponents

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3 and equiµnent.located in the Auxiliary Feedwater Purrp Roan have a design value of lOOOF or greater for the fluid medium which it handles.

The piping used in the system has a primary rating of 600# at 8SO°F. .

with valves and other carnponets of an equivalent rating. 'I'herefore, the rcx:::m temperature and humidity is within environmental qualification limits for the equipnent in the roan.

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.*The auxiliary turbine driven feedpump acceptable operating range for total head. as established by the monthly Technical Specification Surveillance Procedure is 1404 < f). P . ::::. 1607 psid for a pump speed of 3560 RPM. As can be seen in Attachment 7 the pumps total head was below the lower head limit.

The low total head value was a result of lower than specified pump speed. The pump speed varied between 3408 to 3462 RPM. Therefore,*

the test acceptance criteria for total head is not iildicative of pump operability.

• In the monthly Technical Specification Surveillance.Procedure a reference value for total head at a pump speed of 3460 ~'as establiShed.

Pump operability w-as .therefore based. on this value since it is a rrcre.. representative one. For a pump speed of 3460 the total head ..... .

was calculated to be 1392 psid. The ASME B & "PV cOae limits based on this value were 1253 ~AP < 1433 psid. The pump total head throughout the test was within this. range and was detennined to perform as designed..

• The p~ acceptable bearing vibration as established by the monthly .

Technical Specification Surveillance Procedure was to be less than

1. 8 mils. The ptunp operated well below this limit throughout the duration of the test. (Refere1ce Attadm1ent 7).

The pump and pump turbine driver bearing temperatures were less than 120oP for the duration of the test. (Reference Attachment 8). This was *below the vendors operating caution value of 180°.F. * **

Attachment 9 plots the roan temperature and humidity for the duration of the test. The maximum temperature reached during the test was 42°c and humidity was 80%. Far the same reasons as discu5sed in the rrctor driven auxiliary feedpump test, the tenperature and humidity is within the environmental qualification-limits for the equiµnent in. the roan.

• IV. Conclusion It was detennined fran the endurance testing of both the auxiliary motor driven and turbine driven feedpumps that the pumps performed as designed without exceeding any operating limits. It was _also

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4 derobnstrated that roan tariperature and humidity were within the environmental qualifications of the eCrfilpnent in the rcx::m.

v. Reference

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