ML19210B359

From kanterella
Jump to navigation Jump to search
Forwards Revised Section to Met Ed 730521 Response to AEC 730307 Request for Design Review of Control Circuits of All safety-related Equipment.Section Entitled Nuclear Svc Closed Cooling Water Pumps NS-P-1A,1B & 1C.
ML19210B359
Person / Time
Site: Three Mile Island Constellation icon.png
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)
v • d • e


Text

'

AEC D' JIBUTION FOR PART 50 DCCKET Fr ~

AL (TDiPORARY FOPE) CONTROL NO: 5628 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: ORIG CC OTHER SENT AEC PDR X 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 revised Section entitled " Nuclear : trvice ., n Lc Closed Cooling Water Pumps NS-P-1A,13 & IC..

g 1 Ww n - -d-' , A,r v ,'I O PLANT NAME: Three Mile Island Unit # 1 FOR ACTICN/ INFO?RATICN 7-23 7't #nd BUTLER (L) ,, ,,A5t:WENCER(L) ZIDIANN(L) REGAN(E) .

W/ Copies W/4 Copies W/ Copies W/ Copies CLARK (L) STOLZ(L) DICKER (E)

W/ Copies W/ Copies W/ Copies W/ Copies GOLLER(L) VASSALLO(L) KNIGHICN(E)

W/ Copies W/ Copies W/ Copies W/ Copies KNIEL(L) SCHDIEL(L) YOUNGBLOOD(E)

W/ Copies W/ Copies W/ Copies W/ Copies INTERNAL DISTRIEUTION

@ G F_IL[ / TECH REVIEW DENTON LIC ASST A/T IND

,,,,*"AEC PDR NDRIE GRIMES BROWN (E) BRAIDIAN OGC, ROCM P-506A SCHROEDER GAPMILL DIGGS (L) SALTDIAN

,,, t1UNTZING/ STAFF y MACCARY KASTNER GEARIN (L)

/ ASE .M: NIGHT BALLARD acCULE0URNE (L) PLANS GIAMBUSSO .,ePAWLICKI SPANGLER LEE (L) MCDONALD BOYD /HA0 ENVIRO MAIGRET (L) DU3E MOORE (L)(WR) ,,,, STELLO SERVICE (L)

,,,BEYOUNG(L) (PWR) / 0USTON MULLER SHEPPARD (E) INFO SKOVHOLT (L) NOVAK DICKER SMITH (L) C. MILES P. COLLINS ROSS KNIGHTON TEETS (L)

IPPOLITO YOUNGBLOOD WADE (E)

REG OPR v TEDESCO REGAN WILLIAMS (E)

A ILE & REGICN(3) ,,,,LON G PROJECT LDR WILSON (L)

MORRIS STEELE LAINAS 4*"3ENAROYA HARLESSk [k M - EXTER'!AL DISTRIBUTION /r i - LOCAL PDR Harrisbur . Pa. r v 1 - DTIE(A3ERNATHY) (1)(2)(9)-NATIONAL LAB'S 1-PDR-SAN /LA/NY 

    ,l - NSIC(EUC:LWAN)                                    1- R. S c hoon-ake r , CC , GT, D- 323        1-GERALD LILLOUC:C 1 - ASL3(YCRE/SAYRE/                                 l-R. CATLIN, E-256-GT                        BROOKHAVEN MAT. LAB WOODARD/"H" ST.                                 1-CONSULTAUT' S                              1-AGMED(WALTER KCES~I3

/16 - CYS ACRS MI:003I Sent 7-23-73 to NEWMARK/ BLDiE /AGBABIAN Di-C-427-GT E. Goulbourne for 1-GERALD ULRIKSON...ORNL, 1-RD.. MULLER..F-309 GT Dist. 1911 o7oD6 fg 

                                                             & - ,.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 ', ' *c Pressurized Water Reactors Branch No. 4 - 

                                                                                                                                                  ~~
                                                                                                                                                      .,}',
                                                                                                                                                                 -      ,J' 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, - 

                                                                                                          ~
n.  !' m
                                                                                                       .,              /  -fa ',

J. G.' Miller 

                                                                 ,,j                                     Vice President c)                      'N asb 4

Enclosures Il I 3tzssy B) s $b , Y 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}}

Retrieved from "https://kanterella.com/w/index.php?title=ML19210B359&oldid=2390615"