ML19338E845
| ML19338E845 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 09/30/1980 |
| From: | Dunn C DUQUESNE LIGHT CO. |
| To: | Vargas S Office of Nuclear Reactor Regulation |
| References | |
| TAC-44632, NUDOCS 8010060223 | |
| Download: ML19338E845 (3) | |
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Sep teraber 30, 1980 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attn:
Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing Washington, DC 20555
Reference:
Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 NRC Letter dated January 22, 1980 - Requirement for Auxiliary Feedwater System - Additional Information Gentlemen:
In your letter dated January 22, 1980, you requested additional information on the Auxiliary Feedwater System at Beaver Valley Power Station.
In our response dated March 25, 1980, we informed you that additional information would be supplied after our engineering evaluation had been complated. The attached addresses the remaining open items for which information was yet to be supplied.
If you have any questions, please contact my office.
Very truly yours, C. N. Dunn Vice President, Operations Attachment cc:
Mr. D. A. Beckman, Resident Inspector U.S. Nuclear Regulatory Commission Beaver Valley Power Station Shippingport, Pennsylvania 15077 U.S. Nuclear Regulatory Commission Q[
c/o Document Management Branch
[
Washington, D.C.
20555
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DUQUESNE LIGHT COMPANY 4
Beaver Valley Power Station Reply to NRC Letter Dated January 22. 1980 l
1.
Response to Additional Short Term Recommendation 1 The design of the level and alarm indication for the primary plant I
demineralized water storage tank consists of two channels. There are l
two separat a level transmitters (LT-104A1 and 104A2).
Each transmitter supplies a signal to its associated control room level indicator (LI-104A1 and 104A2) and associated set of high and low level switches (L5H-104A1, LSL-104A1 and LSH-104A2, LSL-104A2). The level switches annunciate each channel at the vertical board and at the sequence of 4
events recorder in the control room. The annunciator reads: PRI PLANT DEMIN WTR STORAGE TANK LEVEL HIGH-LOW CH I with a second duplicate annunciator for Channel 2, both channels as supplied from vital instru-ment bus No. 2 which is backed up by battery No. 2.
4 The additional low-low level alarms will be redundant. The setpoint, as presently proposed, will alarm with approximately four feet of water remaining in the tank.
This setpoint will allow 30 minutes for operator action.
2.
Response to Additional Short Term Recommendation 2 Duquesne Light Company commits to perform the test on the AFW pumps as revised in the attachment to your letter.
3.
Response to Additional Short Term Recommendation 3 4
I The AFW system flow indication will be upgraded to safety grade in 1
accordance with the criteria and schedule of NUREG 0578 item 2.1.7.6.
4.
NRC Long Term Plant Specific Recommendation No. 2 We have evaluated the design and determined that modifications to the AFW system were required to maintain the required flow to the steam generator and meet the high energy line break criteria in SRP 10.4.9 and Branch Technical Position 10.1.
Check valves were installed down-stream of the motor operated. valves used to align the AFW pumps to the steam generators.
The attached sketch (Fig. 1) shows the location of the new check valves.
The addition of the check valves provides the design capability required to meet the stated criteria.
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OTilER ALTERNATIVE WATEf1 SOURCES o USE OF FIRE (DIESEL PUMPSI SYSTEM WITil RIVER WATER y
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LO E LEC"RICAL LEOEND PUMPS gL Q
LO - LOCKED OPEN LC -LOCKED CLOSED LO NGTE: TilESE BLOCK VALVES ARE CLOSED FO - FA'l[0P5' ED ~
~ N Tul10lNE FOR PURPOSE OF TESTING OF PUMPS.
DRIVEN PUMP FC - FAIL CLOSED TEST OF MORE TilAN ONE PUMP PER SOV SillFT WILL NOT DE Tile PRACTICE.
Tills STAGGEli TESTING SIIALL D<] - NORMALLY OPENED MOV h'
IMPilOVE ON CilANCE OF MUCil
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- AIR OPERATED
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POSITION INDICATED VALVES Auxiliary Feedwater System Beaver Valley, Unit-1 Figure 1.