ML19210B359
| ML19210B359 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/19/1973 |
| From: | John Miller METROPOLITAN EDISON CO. |
| To: | Schwencer A US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7911070686 | |
| Download: ML19210B359 (4) | |
Text
AEC D' JIBUTION FOR PART 50 DCCKET Fr AL
~
CONTROL NO:
5628 (TDiPORARY FOPE)
FILE:
FROM:
DATE OF DCC DATE REC'D LTR MEMO RFT OTHER Metropolitan Edison Company Reading, Pennsylvania 19603 7-19-73 7-23-73 x
J. G. Miller TO:
A. Schwencer SENT LOCAL PDR X 1 81gned 39 CLASS UNCLASS PROP INFO INPUT NO CYS REC'D DOCKET NO:
XXX 40 50-289 DESCRIPTION:
ENCLOSURES:
Ltr re their 5-21-73 ler..re.. control circuits of all related safety equipment.... furnishing
.Achy 0n.,. pDb,tD
.n n Lc revised Section entitled " Nuclear : trvice Closed Cooling Water Pumps NS-P-1A,13 & IC..
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& -,.1 7 2 7 4 7 METROPOLITAN EDISON COMPANY PCST OFFICE BOX 542 RE ADING, PENNSYLVANI A 19603 TELEPHONE 215 - 929-3601 g r- ? - * ~y Fi's O y. July 19, 1973 / Mr. A. Schwencer, Chief
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.,}', Pressurized Water Reactors ,J' Branch No. 4 Directorate of Licensing ~~ U.S. Atomic Energy Commission r-Washington, DC 20545
SUBJECT:
THREE MILE ISLAND NUCLEAR STATION UNIT 1 77-DOCKET NO. 50-289
Dear Mr. Schwencer:
On May 21, 1973 Met-Ed responded to your letter of M'rch 7,1973 which requested that a design review of the control circuits of all safety related equipment be performed. In our response concerning the Nuclear Service Closed Cooling Water Pumps we made several incorrect statements. I am enclosing 40 copies of a revised section entitled " Nuclear Service Closed Cooling Water Pumps NS-P-1A,1B and IC". Very t_ruly yours, ~ ! m n. -fa ', / J. G.' Miller Vice President ,,j c) 'N asb 4 Enclosures Il I 3tzssy B) $b Y s 4 l@ 1584 272 . > 0 v% 0
~ NUCLEAR SERVICE CLOSED COOLING k'ATER PUMPS NS-P-1A, 13, 1C Elementary Diagra=s: SS-208-350, 351, 352, 353, 354, 359 NS-P-1A may be started if:
- 1) its control switch CS3, tag #CS/NS-P-LA is turned to the start position.
This action provides a direct start, or 2) the control switch CS3 is in standby, pump "C" is manually stepped (CS3/1C & 52/1C0, the auto-start lockout is not energized (27/86A) and pump "B" fails, or, 3) the control switch CS3 is standby, pump "C" is started (CS3/1C & 52/1C), the auto-start lockout is not energized (27/86A), and pu=p "B" fails, or 4) with the pump selector switch 43SS/P in the " pump A" position and the E. S. Diesel Sequen;:e #3 signal present. The pump breaker is equipped with a position switch (device 33), a con-tact of which is in parallel with the breaker "B" auxiliary switch, (draw-out), so that when the breaker is withdrawn from its operating position, (not fully inserted in its cubicle), the position switch c1cses, maintaining positive continuity of the interlock circuit independent of breaker position. Thus, NS-P-1A may be started manually, or by E. S. Sequence v3, or auto. matica11y when NS-P-1B fails under conditions calling for use of one pump (B) (regardless of the position of the NS-P-1C breaker) or u,nder conditions calling for use of two pumps (B & C) and pump B failc. 4 1584 273 e
NS-P-1B may be started by:
- 1) moving the control switch CS3, tag
- CS/NS-P-13-P, to the start position and if its circuit breaker on bus IS is not closed (52aX3), or 2) the control switch CS3 is in standby and pump "A" failed (62/lA), the auto-start lockout is not energized (27/86A), and if pu=p B-lS breaker is not closed (52aX3), or 3) CS3 in T
standby position, pump "C" failed (62/lC), pump "A" not in auto-starr (RX), pu=p B-1S breaker is not closed (52aX3), and the apto-start lock-out is not energized (27/86), or 4) pump is selected for operation from bus IP (43 SS/P), E.S. Diesel Sequence #3 signal present, circuit breaker on bus IS is not closed. NS-P-1B may be operated from either bus IS or IP. Operation from bus IS is similar in detail to the above. e NS-P-1B is equipped with a breaker position contact, (device no. 33), in parallel with the breaker auxiliary switch, (dravout), so that when the breaker is withdrawn from the operating position, (not fully inserted in its cubicle), the position switch is ' closed maintaining positive continuity ' of the circuit. Thus the pump "B" failed relays 62/NS-PlB-P or 62/NS-PlB-S which auto-matically start pumps "A" and "C" will operate regardlese of the position of their respective breakers. The operation of pump NS-P-lC is similar to detail in NS-P-1A. 1584 274}}