ML20008G294

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Forwards Proposed Mods to Auxiliary Feedwater Control & Protection Design,In Response to Requirements of NUREG-0737 Section II.E.12 & License Condition 2.C.(21)(e).Concurrence Requested by 810801
ML20008G294
Person / Time
Site: Farley  Southern Nuclear icon.png
Issue date: 07/01/1981
From: Clayton F
ALABAMA POWER CO.
To: Varga S, Youngblood B
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.E.1.2, TASK-TM NUDOCS 8107070281
Download: ML20008G294 (16)
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Text

{{#Wiki_filter:# e Ma!!!ng Address 6 h r h 18 h S re t Post Office Box 2641 Carrningham Alabarna 35291 Telephone 205 783-6081 F. L. Clayton, Jr. b %"OCZy"' Alabama Power July 1, 1981 Docket No. 50-348 to A No. 50-364 lif c b Director, Nuclear Reactor Regulation i U. S. Nuclear Regulatory Commission N ~ O -9' Washington, D. C. 20555 D%%gIO8/g A Attention:-rMr. S. A. Varga g, Mr. B. J. Youngblood f, F3 Joseph M. Farley Nuclear Plant - Units 1 & 2 NUREG-0737 Section II.E.1.2 and NPF-8 License Condition 2.C.(21)(e) Gentlemen: In accordance with my letter dated December 4,1980 to Mr. R. L. Tedesco and as required by Farley Nuclear Plant Unit 2 Operating License NPF-8 Section 2.C.(21)(e), Alabama Power Company submits for NRC review the attached description of proposed modifications to the Farley Nuclear Plant Auxiliary Feedwater control and protection design. In order for Alabama Power Company to implement these changes on Farley Unit I during the third refueling outage, your concurrence is requested no later than August 1, 1981. These changes have been agreed to in principle as a part of the Farley Unit 2 full power licensing process. If you have any questions, please advise. Yours v_ery_truly, f bt F. L. Clayton, r. FLCjr/RWS:rt Attachment (pd cc: Mr. R. A. Thomas Mr. G. F. Trowbridge b'# f.pFO Mr. J. P. O'Reilly (w/ attachment) /

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Mr. E. A. Reeves (w/ attachment) Mr. J. O. Thoma (w/ attachment) [P pA'ht[g c( g4 8 Mr. W. H. Bradford (w/ attachment) loO I 8107070281 810701 m. PDR ADOCK 05000348i P PDRg

o Description of Proposed Auxiliary feedwater System l'odifications The attached sketches provide proposed modifications to the present design of the Farley fluclear Plant Auxiliary Feedwater System. The purpose of these modifications is to provide a design which addresses the flRC concerns stated in Enclosure 2 to the flRC letter to APCo, dated flovember 5, 1980. The following item numbers correspond to the fiRC position numbers as presented in the referenced flRC letter: 1. The !?RC has expressed concern that the present design has no provision to automatically fully open the motor driven auxiliary feedwater pump discharge valves in response to some of the Auxiliary feedwater System automatic initiation signals when the valve control switches are in tne modulate position. As a result of this concern the flRC has requested that the design be modified such that all automatic signals shown in Figure 7.2-14 of the FSAR automatically open the subject valves, regardless of the position of the associated control switches. The proposed design modifications shown in the attached sketches allow the motor driven auxiliary feedwater pump discharge valves to auto-matically fully open in response to all of the Auxiliary Feedwater System automatic initiation signals shown in Figure 7.2-14 of the FSAR, regardless of the position of the valve control switches. 2&3. The flRC has further expressed concern that the redundant solenoid valves in the control air lines to the auxiliary feedwater pump discharge valves are presently arranged to be " energized" to close or modulate and "de-energized" to open the discharge valves. In addition the f4RC has expressed concern that all manual control stations for both motor and turbine driven pump discharge valves are presently powered from a single train power source. The loss of either of the power supplies will result in the fully opening of all of the subject discharge valves and preclude their capability to regulate flow. As a result of this concern the f1RC has requested that the design be modified such that the loss of a single train power supply will not cause all the pump dischsrge valves to open, nor preclude their capability to regulate flow from both of the redundant sources of AFW. Specifically the manual control stations for the turbine driven discharge valves should be powered from the same source used to derive power for the turbine driven pump steam admission valves and related controls. For the motor driven pump discharge valves, the proposed design modi-fications shown in the attached sketches replaces the existing redundant solenoid valves in the control air lines with solenoid valves required to be " energized" to open and "de-energized" to close or modulate. For the turbine driven pump discharge valves, the proposed design modifications replace the existing redundant solenoid valves in the control air li: -

  • each discharge valve with only one solenoid valve required to be " energized" to open and "de-energized" to close or modulate.

The new solenoid valve, as well as the remaining existing solenoid valve in the air line of each discharge valve associated with the turbine driven pump will be powered from an Uninterruptible Power Supply (UPS), which also is the source of power for the turbine

Description of the Proposed Auxiliary Feedwater System Modifications Page 2 driven pump steam admission valves. In addition,.the present power source for the manual control stations of the turbine driven pump discharge valves is being replaced with a UPS. These modifications make the entire operation of the turbine driven pump and its associated steam admission and. discharge valves dependent on the UPS for power. As a result some circuits and control stations will be relocated for separation purposes. The above modifications to the solenoid valves and the power supplies will prevent the loss of a single power supply from causing all the auxiliary feedwater pump discharge valves to open, and from precluding their capability to regulate flow from both of the redundant sources of AFW. 4. The proposed design modification which addresses the NRC concern regarding the accumulator air supply for the turbine driven auxiliary feedwater pump steam admission valves is shown on attached sheet No. 13. The proposed design uses a check valve and solenoid valve to provide diversity of isolation. The solenoid valve and check valve have been relocated outside the main steam ~ room to improve accessibility for periodic testing. Test connections have been added to allow individual operability checks of check valve and solenoid valve. The check valve is soft seated as required by Bulletin 80-01. The check valve, pressure switches, and solenoid valve are seismic Class 1. The design basis for the air accumulators is to provide sufficient capacity to open the valves and allow turbine operation for two hours. The design basis, for the accumulator air supply is to provide redundant backfica prevention between the safety related air accumulator and non safety. instrument air system. The spring loaded check valve provides isolation whenever instrument air pressure falls below accumulator pressure and'is the primary protection for the rapid depressurization event. The solenoid valve provides isolation whenever instrument air pressure falls below the pressure switch setpoint. The pressure switch is to be set at 80 psig to provide isolation for the slow depressurization event. An alarm is provided to alert the operatoi to low pressure in the accumulators. The air isolation solenoid valve will-be powered from a UPS. i k

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= X1 12 13 14 RE.SE1' SWITGR (HS 10370)

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.n. .. r7 CALCULATION SHEET kk :0 CALC. NO. R E V. NO. )jj - A b ~~,! ~ b-Ab*U CHECKED RL(hd2 # yTE DATE ORIGINATOR PROJECT I.11djirley_Hticlear_.Elant - > JO3 No. 7597 SUBJECT Stean Admission Valve Accumulator Air S.upply SHEET NO 1{ 1 [ [ [ ((' / DELETE ~ ~ /* / EXISTING 3 I /, -4 y y INSTRUMENT '/235' g F 8/ 4 A / AIR CONNECTION / '4 5 b IN MAIN STEAM $ 6 HV ~~ Check valve C 2K NV107A deleted 7 s ( l / f } V ) 9 10 4 11BD-643 11 MAIN STEAM ROOM 12 13 PLANT llEATING EQUIP:ENT ROOM 14 15 1s llVIO(,A FROM EMERGENCY AIR hM '8 COMPRESSORS, ' N/ ] AREA 0F CIIANGE -19 gg p3[g 1( ggy _ _ _,gn. Tc. 20 ,p [Q y/ 8 Psig 21 \\ M!- 22 f i- - 7C% - 1 23 NOTES: 3

  • Furnished with valve ' M f/0TE I I

24 25

1. Check valve to be spring X

loaded, soft seat. s[ g4 ,47g 2s 27

2. EV3235A shown as typical for(

28 - HV3235A & B, enly PAL to be ( ) i} common. / 29 L. 'TC 'TC 3. Pressure switches and solenoid ( 39 valve seismically qualified. \\ [E/ SM i c CL.I--b k 32 N 33 34 35 30 f GFD.2706 8/76 (E049)}}

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