ML19312E125

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Responds to NRC 800408 Ltr Requesting Addl Info Re Auxiliary Feedwater Sys.Clarification of Util 791120 Response to Recommendation GS-6 Encl
ML19312E125
Person / Time
Site: Farley  Southern Nuclear icon.png
Issue date: 05/27/1980
From: Clayton F
ALABAMA POWER CO.
To:
Office of Nuclear Reactor Regulation
References
TAC-12391, TAC-12963, NUDOCS 8006030312
Download: ML19312E125 (23)


Text

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                                            ?!ay 27, logo Docket !;o. 50-348
                      !;o . 50-364 Director, ;uclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.              20535 Re.:         Letter fron !!r. A. Schwencer to
                    !!r. F. L. Clayton Dated April 3, 1980, Concerning Auxiliary Feedwater Gentlemen:

In response to the referenced letter, Alabana Power Company submits Enclosure 1 for the Farley :uclear Plant. In addition, Alabama Power Company wishes to clarify our response to Recommendation GS-6 which was included in our letter to Mr. D. G. Eisenhut dated :;ovember 20, 1979. The clarification is provided as Enclosure 2. If there are any fur ner questions, please advise. Yours very truly, F. L. Clayton, Jr. RWS:de Enclosures cc: Mr. C. F. Trowbridge Mr. R. A. Thomas 30 1/ s

                                                                                   / /

80060so3iW p

e Enclosure 1 t Reconnendation GS-5 The licensee should verify that appropriate periodic testing is performed to deconstrate that the air reservoirs meet the minimum requirements (2 hours). If the air reservoirs cannot be shown to meet the two-hour requirement, then emergency procedures should be established for manually initiating and controlling the systen independent of any AC power source.

Response

The air reservoirs (on the steam adeission valves to the TDAFUP) vill be tested each refueling cycle to verify the design intent of the air reservoir system. If the air reserveirs cannot be shown to meet the two-hour requirement, then energenc; procedures will be established for manually initiating and controlling the system independent of any AC power source. Reconmendation GS-6 The licensee should confirm that these administrative controls are or will be written into their procedures.

Response

Such administrative control provisions have been incorporated into the appropriate plant procedures or directives. Additional Short-Tern Reconnendations

1. The following criteria should be used when implementing this recommendation:

Recuirecent A The system should be redundant all the way from the level detectors to the indications and alarms inside the control rood.

Response

The proposed design for both units consists of two separate and redundant condensate tank level transmitters, one Train A and one Train B. Within the control room, two separate indicators are provided. Each transmitter has its own annunciator point. Two alarm windous are provided in one light box.

Requirement B The power supplies should also be redundant.

Response

The pouer supplies for the above design will be separate and redundant and have battery backup. Requirement C For the long term (1/01/81) the entire water level indication and alarm systems should be designed for safety grade require- ' ments including the use of Class lE circuitry and power supplies, j Response Each transmitter loop will consist of an instrument power supply, a transmitter and an alarm module. All of these components and associated wiring will be Class 1E. Each alarm module will provide a contact closure for annunciation on a separate annunciator window. The annunciator itself is not Class lE, but it has redundant power supplies; the pri=ary supply is Class lE.

2. The licensee should commit to follow the provisions of the revised AFW punp endurance test and submit the following test information:

Requirement A 4 A bilaf description of the test method (including flow schematic j diagram) and how the test was instrumented (i.e., where and how 4 the bearing temperatumed were measured).

Response

There were two alternate test modes possible for each pump, i.e., recirculation back to the condensate storage tank or feeding the steam generators (see Figures 1, 2 and 3). The recirculation path to the condensate storage tank from each pump includes a full flow test line as well as a smaller minimum flow line. Ingersoll-Rand recommends that the pumps not be operated for an extended period of time in any mode that would not allow at least 25% of rated flow. The minimum flow lines do not meet this criteria, therefore, the full flow test line was utilized in the 48-hour endurance test. For the purposes of these tests, Motor Driven AFW Pump 1A utilized the recirculation path to the condensate storage tank while tests for Motor Driven AFW Pump 1B and the turbine driven AFW Pump

                     , utilized flow to the steam generators.

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O 4 1 i t RTD's are installed in the bearing oil reservoirs of both . bearings for the motor and for the thrust bearing of the pump

(see Figure 4). These bearing oil temperatures are indicated i on a panel in the plant Control Room for both MDAFU pumps.

Punp suction pressure, discharge pressure, and ficw were all 4 . measured locally with installed gauges. There is no remote indication for the turbine bearing oil temperature, so only bearing housing terperatures could be measured. Pump roon temperature 2nd humidity were determined by using a sling psychrometer (sea Figure 8). Requirement B . A discussion of how the test conditions (pump flow, head, speed and steam temperatures) compare to design cperating conditions.

,               Response 4

i

The pressure and flow for motor driven pumps lA and 1B and the l

turbine driven pump are shown in Figures 7,11 and 15 respec-tively. All readings are within the manufacturer's operating l limits. The variation of pressure and flew with time en the ! TDAFW punp is attributable to drif t of the flow control valve - controllers, the turbine speed controller, or a combination of

both. .All pumps were operated at rated speed and since the tests on the turbine driven pump were conducted at 90% reactor i power, steam tenperatures were well above the 400 F. test requirement.
,               Requirement C Plots of bearing / bearing oil temperature vs. time for each bearing of each AFW pump / driver demonstrating that temperature design limits were not exceeded.

Response

4 The limit established for bearing / bearing oil temperature was 185 F. For both notor driven pumps, the bearing / bearing oil temperatures remained well below the limit as depicted in Figures 6 and 10. i For the turbine driven pump, the bearing oil temperature increased steadily for the first tuo hours of operation, then leveled off between 181 F - 183 F. for the remainder of the test. (See Figure 5 for TDAFW pump bearing / bearing oil

!                     temperature measurement and Figure 14 for a plot of all temperatures.)

I'

i + I } Requirement D 1 A plot of pump room ambient temperatur- .:i. ...w. .cy vs. time 4 demonstrating that the pump room ambient conditions do not ! exceed environmental qualification limits for safety-related equipment in the room.

Response

l Safety related valves with =otor operators located in the pump room include the service water supply isolation valves and the

discharge header isolation valves. The motor operators have a nameplate rating of 104 F. and can operate in 100% relative l, humidity. Safety grade pump room coolers will maintain the j maximum room temperature below 1040 F. Safety related instru-

! mentation in the pump room was specified for operation at . 120 F. and 100% relative humidity. Figures 3, 12, and 16 l demonstrate that none of these values were exceeded for Cae two motor driven and the turbine driven pumps respectively. 2 Fequirement E A statement confirming that the pump vibration did not exceed allowable limits during the tests.

Response

Figures 9, 13 and 17 demonstrate that vibration in the motor driven and turbine driven pumps did not exceed allowable limits. The above test data is applicable to Unit 1 only. The endurance tests have been completed for Unit 2 and uill be transmitted when the data is assimilated. Long Tern Recommendations

1. Recommendation GL-3

_See GS-5 above, l

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m m INSTRUMENTATION FOR MDAFW PUMP BEARING TEMP MOTOR PUMP

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u u a 4 0 @ G 8 DESCRIPTION BEARING / BEARING OIL TEMPERATURE MEASUREMENT Digital thermometer for bearing housing and remote Indication for bearing oil f rom RTD inserted in oil Motor Outboard Bearing reservoir. Digital thermometer for bearing housing and remote indication for hearing oil f rom RTD insert ed in of t h tio t o r Inhoard nearing reservoir. h LPump Inboard Bearing Digital thermometer for bearing housing. Digital thermometer for bearing housing and remote h Pump Outboard Bearing indication for bearing oil from RTD inserted in oil reservoir. FIGURE 4

INSTitDMENTATION FOR TDAIN PUMP BEARING TEMP TURBINE PU!!P _ - 3-26 st D D @ DESCRIPTION BEARING / BEARING OIL TEMPERATURE MEASUREMENT h Turbine Outboard Bearing Digital thermometer for bearing housing. h Turbine Inboard Bearing Digital thermometer for bearing housing. h Pump Inboard Bearing Digital thermometer for bearing housing. Digital thermometer for bearing housing and remote Pump Outboard Bearing indication for bearing oil from RTD inserted in oil reservoir. FIGURE 5

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F ,. . 1 a l* Enclosure 2 The following is the revised response to Recommendation GS-6. (Revisions are noted by a vertical line in the right-hand margin.) Administrative Controls have been implemented in the appropriate procedures which require that after maintenance is performed on the auxiliary feedwater system, which could affect proper valve align-ment, or af ter a refueling outage, a system valve lineup will be ( performed by operations personnel. Independent verification of the system valve lineup will be performed by a second qualified individual. In a letter dated October 13, 1979, the NEC requested that APCo propose Technical Specifications to assure that prior to plant startup following an extended cold shutdown, a flow test would be performed to verify the normal flow path from the primary AFL' system water source to the steam generators. In response to the above letter dated November 20, 1979, Alabama Power committed to implementing Administrative C:ntrols and to propose Technical Specifications in compliance with this request. Upon further study, it was determined that Revision 1 of the Inservice Testing Program (transmitted 11/16/79) for Farley Nuclear Plant provides for exercising the valves in the turbine driven auxiliary feedwater pump discharge to the steam generators. This discharge rate is design flow of the auxiliary feeduater system during a mode of operation approaching cold shutdoun or leaving cold shutdown in which steam is available. The Inservice Testing Program also provides for exercising the valves in the discharge from the motor driven auxiliary feedwater pumps to the steam generators at the design flow of the auxiliary feedwater system at cold shutdown. Verification of these flows will provide assurance that the valves have opened sufficiently to perform its function and that flow is going into the steam generators. The Inservice Testing Program is a part of Technical Specifications Section 4.0.5 that is presently in effect, therefore an additional Technical Specification is not required.

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