ML19210B250

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Responds to 730307 Request.Forwards Info Re Makeup & Purification Sys (HPI) Makeup Pumps MU-P-1A,1B,1C,decay Heat Removal Pump DH-P-1A & DH-P-1B,reactor Bldg Spray Pump BS-P-1A & BS-P-1B & a Decay Heat Pump DC-P1A,1B
ML19210B250
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 05/21/1973
From: John Miller
METROPOLITAN EDISON CO.
To: Schwencer A
US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 7911040203
Download: ML19210B250 (8)
v • d • e


Text

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Metropolitan Edison Company Reading, Pennsylvania 19603 05-21-73 05-22-73 X J. G. Miller TO: ORIG CC CQiER SEI.T AEC PD3 x Mr. A. Schwencer 1

CIASS: (j/FROPIliF0 INPUT NO CYS P2C'D DCC GI liO:

1 50-289 DESCRIF2ICIi: EXCLOSURES:

Ler re our 03-07-73 Itr... furnishing info reg 1)"MAKE-UP AND PURIFICATION SYSTEM, . . . . . "

a design review of control circuits of all 2)" DECAY HEAT REMOVAL PUMP DH-P-1A & DH-P-1B" safety related equipment and trans: 3)" REACTOR BLDG SPRAY PUMP BS-P-1A & BS-P-1B" 4)"A" DECAY HEAT CLOSED COOLING WATER PUMP DC-P-1A & DC-P-1B" PINi? !*A!GS: THREE MILE ISIAND, UNIT 1 (1 cy ea enc 1 rec'd)

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POST OFFICE BOX 542 READING, PENNSYLVANI A 19603 TELEPHONE 215 - 929 3601 

                                                                                                                                                                 .' May 21, 1973 Regulatory                                   File Cy.~

Mr. A. Schwencer, Chie# ' ~' Pressurized Water Reactors s ,. . U 

                                                                                                                      \ ' , .C'" *" " ,()/[

Branch No. k Directorate of Licensing U. S. Atomic Energy Commission jj~glf Washington , D. C. 205h5

SUBJECT:

THREE MILE ISLAND NUCLEAR STATION UNIT 1 DCCKET NO. 50-289

Dear Mr. Schwencer:

Your letter of March 7,1973 requested that Met-Ed perform a design review of the control circuits of all safety related equipment at the sub, ject plant to assure that disabling of one component does not, through incorpora-tion in other interlocking or sequencing controls, render other ec=ponents inoperable. h0 copies of the results of our design reviews are enclosed. In addition, you requested that our procedures be reviewed to ensure they provide that, whenever part of a redundant system is removed from service, the portion remaining in service is functionally tested ic=ediately after disabling of the affected portion and, if possible, before disabling of the affected portion. Applicant proposes the following answer to the previous re" quest. A standing order vill cover the case where an Engineered Safeguards component is taken out of service. It will state that the operability of equipment redundant to that renoved from service vill be demonstrated i==ediately prior to removal. Should an Engineered Safeguards ccmponent become disabled, the operability of equipment redundant to that disabled vill be demonstrated immediately following the detection of the disabled Engineered Safeguards compenent. Very truly yours, d 

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M. J. G. Miller 'r asb /kg s C07EED t'!.E0 D'\ Vice President d ff %g. tnclosures idAY 221973 > ' .! g REC';tATORY Si ica5 UAll SE* TION ' 

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i o. 2 M 4,V . ., MAKE-UP AND PURIFICATION SYSTDI (H.P. INJECTION) , -s . MAKE-UP PUMPS MU-P-1A, IB, 1C k .-\ Ele =entary Diagram: SS-208-213, 214, 215, 216, 217 Q~- :,7 MU-P-1A starts if: 1) the 43/SS2 selector switch on the ID E.S. bus is in the "A" position, the CS4 switch, tag #CS/MU-P-1A is in the start position, or 2) if the 43/SS2 selector switch is in the "A" position and if there is an E.S. actuation signal present. e MU-P-1B starts if: 1) the 43/SS2 selector switch on the ID E.S. is in the "B" position and the CS4 control switch, tag #CS/MU-P-1B-D is in the start position, or 2) the 43/SS2 selector switch on the IE E.S. . bus is in the "B" position and the CS4 control switch, tag #CS/MU-P-1B-E is in the start position, or 3) if the 43/SS2 selector switch on either E.S. bus is in the "B" position and if there is an E.S. actuation signal present. s s MU-P-1C pu=p starts if: 1) the 43/SS2 selector switch is in the "C" position and the CS4 control switch, tag #CS/MU-P-1C'is in the start position, or 2) the 43/SS2 selector switch is in the "C" position and . there is an E.S. actuation signal present. MU-P-1A is interlocked with cake-up pumps lube oil pu=p MU-F-2A, M.U. pu=p "A".cain oil pump MU-P-3A, M.U. pump Gear lube auxiliary pump "A" MU-P-4A by a CS4 contact in the starting circuit of MU-P-2A and MU-P-3A and a device no. 52 contact in the starting circuit of FM-P-4A. MU-P-1B is interlocked with M.U. pucp lube oil pump MU-P-2B, M.U. pump "B" main oil pump MU-P-33, M.U. pump Gear lube auxiliary pu=p "B" MU-P-4B in a canner similar in detail to MU-P-1A. Agf Ph Cy.' 

                                     .                                          gnn y %if 158S 092

MU-P-1C is interlocked with M.U. pump lube oil pump MU-P-20, M.U. pump "C" main oil pu=p MU-P-3C, M.U. pump Gear lube auxiliary pu=p "C". - MU-P-4C in a canner similar in detail to MU-P-1A. From the Make-Up pu=p scheme of SS-208-217 the circuit operates as follows: If the MU-P-1A pu=p (ID bus) is running, the "B" or "C" M.U. pu=p cay be started from the 1E bus. If the "B" pump is running 

           .on the ID bus, the C pump may be started on the 1E bus.      If one of the
                                                    ~

Make-Up pumps is running, one or all of the pumps interlocked with it may start if conditions warrant its' starting, (low oil pressure, PS479A/C, PS480A/C). There is no interlocking relay to prevent the "B" , pump from starting if the "A" pump is running, or if the "A" pump is removed from service for maintenance, for instance, except the cump - selector switches and control switches for each pu=p. 

                           ~.

N 1li85 093 W

DECAY HEAT RD:0 VAL PUMP DH-P-1A and DH-P-1B Elecentary Diagram: SS-208-211, 212 Pu=p DH-P-1A cay be started if: 1) the CS4 control switch tag #CS/DH-P-1A is coved to the start position, or 2) the control switch CS4 is in the standby position and an E.S. condition is present. Pump DH-P-1B may be started if: 1) the CS4 control switch tag #CS/DH-P-1B e is in the start position, or 2) the control switch CS4 is in standby and an E.S. signal is present. . There are no interlocking contacts in the starting circuits which will

  • prevent DR-P-1B from starting if DH-P-1A is removed from service for maintenance. Therefore, DH-P-1A or IB will starc automatically regardless of the circuit breaker position of the complimentary pu=p motor.

N N REACTOR BUILDING DIERGENCY COOLING WATER PUMP RR-P-1A and RR-P-1B Elementary Diagram: SS-208-209, 210 RR-P-1A may be started if: 1) the control switch CSI, tag #C'S/RR-P-1A ' is in the start position, or 2) the control switch CS4 is in the standby position and an E.S. signal is present. The opera. ton of RR-P-13 is similar in detail to RR-P-1A. There are no interlocking contacts to prevent RR-P-1B from starting if RR-P-1A is running or if IA is out of service for maintenance purposes. Either RR-P-1A or 1B must be running for valves EFV-4 and EFV-5 (SS-208-424) to open.

  • S'I 1585Of4" 054/-73 3352.-

REACTOR BUILDING SPRAY PUMP B3-P-1A and BS-P-1B Elecentary Diagram: SS-208-207, 208 The operation of BS-P-1A and BS-P-13 is similar in detail to RR-P-1A, 1B. There are no interlocking contacts to prevent BS-P-1B from operating when BS-P-1A ".s operating or if 1A is out of service for maintenance, etc. 4 NUCLEAR SERVICE CLOSED COOLING WATER PUMPS NS-P-1A, 1B, 1C Elementary Diagram: SS-208-350, 351, 352, 353, 354, 359 NS-P-1A may be started if: 1) the control switch CS3, tag #CS/NS-P-1A is in the start position. This action prov' ides an instantaneous momentary start, or, 2) the control switch CS3 in standby and if pu=p "C" fails (52/lC) and the auto-start lockout not energized (27/86A), or, 3) the control switch CS3 in standby and'pucp "S" failed (62/1B-S or 62/lB-P), pump "C" not in auto-start and the auto-start lockout not energized, (27/86A), or 4) with the pump selector switch 43SS/P in the "A" position and the E.S. Diesel sequence #3 signal present. . Pump,"A" is equipped with a breaker position contact. (device 33), in parallel with the breaker ".3" auxiliary switch, (drawout), 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, NS-P-1A may be started manually, under E.S. condition, if pumps NS-P-1B and/or NS-P-IC f.. tis or if the NS-P-1A breaker is withdrawn. Regai: -- N;c gy, 1585 095 u. gge-a 335L

NS-P-1B may be started by: 1) moving the control switch CS3, tag 

      #CS/NS-P-1B-P, to the start position and if the circuit breaker on bus IS is not closed (52aX3), or 2) the control switch CS3 is in standby and pucp "A"   f ailed (62/1A), pump 1B not in auto-start (27/86A), and if pump B-1S breaker is not closed (52aX3), or 3) CS3 in standby position, pucp "C" failed (62/1C), pump "A" not in auto-start (RX), pu=p B-1S breaker
     ,is not closed, (52aX3), and pump    "B". not in auto-start (27/86), or 4) '

pump is selected for operation from bus 1P (43 SS/P), E.S. Diesel sequence 

      #3 signal present, circuit breaker on bus 1S is not closed.

NS-P-1B may be operated from either bus 1S or IP. Operation from bus IS is similar in detail to the abov.e. NS-P-1B is equipped with a breaker position contact, (device no. 33), in parallel with the breaker auxiliary switch, (drawout), so that when s 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. - t Thus, NS-P-1B may be started manually, if pucp "A" fails and/or pu=p "C" fails, under E.S. conditions or if the NS-P-1B breaker is withdrawn. The operation of pump NS-P-1C is similar in detail to NS-P-1A. A NUCLEAR SERVICE RIVER b'ATER PL71P NR-P-1A, 1B , 1C Elementary Diagram: SS-208-355, 356, 357, 358, 360 The operation of ::R-P-1A, in,1C is similar in detail to the above NS-r-1A, IB, IC.

  • D**D
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              .             oo       o Ju   lu k//U a 1585 096

. .a "A" DECAY IIEAT CLOSED COOLING WATER PUMP DC-PIA, 1B Elementary Diagram: SS-208-340, 341 DC-P-1A may be started in the following ways: 1) turning the control switch CS3, tag #CS/DC-P-1A to the start position, or 2) with the control switch CS3 in standby. position and an E.S. signal present. The

  • operation of DC-P-1B is similar in detail to DC-P-1A. The operation of DC-P-1A is separate from DC-P-13. There are no interlocking relays to prevent one from operating when the other is operating or when the com-
      . plimentary pump is out of service for maintenance etc.
                        "A" DECAY HEAT RIVER WATER / UMP DR-P-1A, B Elementary Diagram:     SS-208-342, 343 s

The operation of these pu=ps is similar in detail to the operation of pumps DC-P-1A and DC-P-1B. No interlocks prevent the operation of both pumps at once or of one pu=p when the other'is out of service for main-tenance, etc. . h 1585 097 

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iri:a cg c: ._0FJ/- 73 3354 

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