NRC-88-0113, Forwards Response to Questions in NRC Requesting Addl Info Re Util Recirculation Pump Trip & Alternate Rod Injection Sys

Forwards Response to Questions in NRC Requesting Addl Info Re Util Recirculation Pump Trip & Alternate Rod Injection Sys

ML20151Q977
Person / Time
Site:	Fermi
Issue date:	04/20/1988
From:	Sylvia B DETROIT EDISON CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
CON-NRC-88-0113, CON-NRC-88-113 TAC-59094, NUDOCS 8804270203
Download: ML20151Q977 (9)

Text

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i B. R@h Sylvio -

Group Vee President r

De.for.

C ISOn =sra*.n.., "*"

Ap til' 20, 19 88 NRC-88-0113 U. S. Nuclear Regulatory Commission Attn: . Document Control Desk Washington, D. C. 20555

References:

1) Fermi 2 NRC Docket No. 50-341 NRC License No. NPF-43

2) NRC Letter, Quay to Sylvia, "Fermi 2 ATWS (TAC No. 59094) "

dated March 31, 1988

Subject:

Fermi 2 A7WS - Response to Request for Additional Information Reference 2 requested additional information on the Fermi 2 recirculation pump trip (RPT) and alternate rod injection (ARI) system. Attached is the response to the questions.

If you have any questions, please contact Ms. Lynne Goodman at (313) 586-4211.

Sincerely, Enclosure ec Mr. A. B. Davie Mr. R. C. Knop Mr. T. R. Quay Mr. W. G. Rogers 8804270203 880420

~

I PDR ADOCK 05000341 P PDR

Enclosure to NRC-88-0113 Page 1 ADDITIONAL INFORMATION ON FERMI 2 ATVS Question 1: Provide the electrical functional diagrams for the ARI and RPT systems from the sensors to the final actuated devices.

Reply: Figure 7.7-3, sheets 1 through 4 in the Fermi UFSAR entitled "Reactor Recirculation System FCD" contain the logical presentation of the ARI/RPT design. Sheet 4, attached, depicts the primary portion of the logic. Sheet 1, attached, depicts the logic interface between the trip control and the recirculation pump motor generator field breaker.

Question 2: Please identify, by number in the NEDE-31096-P Appendix A checklist, any items which the station will not be in full conformance with the ARI SER.

Re ply: The Fermi AP.I/RPT complies with each of the nine (9) items listed in NED2-41096-P Appendix A checklist.

Question 3: Please identify the rod motion start and completion times af ter ATWS event detection.

Reply: Rod motion will start 15 seconds af ter detection of an ATWS event and rod motion will be complete af ter an additional 7 seconds.

Question 4: Identify the interf aces if any to the safety related component /cystems and the use of isolators (include isolator application description and NEDE-31096-A Appendix B in f o rma tion) .

Reply: No formal isolators are required in the Fermi implementation of the ARI and RPT circuitry.

Question 5: Verify the diversity of all components utilized for ARI; identify by Manuf acturer and model both ATWS and RPS trip related components.

Enclosure to NRC-88-0113 Page 2 Reply: Diversity of the ARI and RPT systems with respect to the RPS is obtained as discussed in Table A-2 of NEDE-31096-P.

Diversity is achieved by employing an energize-to-trip logic  ;

and actuator design for both ARI and RPT. Both systems are powered by de. The ARI and RPT components are listed below identified by PIS, manufacturer and model along with similar RPS devices.

ARI/RPT Level Transmitter Trip Unit - B21-N091A,B,C,&D Rosemount 1153 B21-N692A,B C,&D Rosemount 510DU Pressure Transmitter Trip Unit B21-N111A,B,C,&D Rosemount 1153 B21-N611A B.C,&D Rosemount 510DU Time Delay Relays B31 A-K50,51,52, &53 Agastat ETR Relays B31-K54,55,5 6,57,5 8,5 9,60,60,62 63.64,65,66,67,68 & 69 Agastat EGP Field Breaker Trip Coils B31-CB1A,B -TC1,2 General Electric 622C502G1 ARI Solenoid Valves C11-F160A,B, F162A,B.C.D. F163A,B Volcor V70900 RPS Level Transmitter Trip Unit C71-N080A, B, C & D Rosemount 1153 C71-N680A, B, C & D Rosemount 510DU Pressure Transmitter Trip Unit C71-N078A, B, C & D Rosemount 1151 C71-N678A, B, C & D Rosemount 510DU Relays C71A-K5A, B, C. & D K6A, B, C, & D General Electric HFA Trip Actuator C71A-K14A, B, C, D, E, F, G, & H General Electric CR105 Question 6: Verify ARI and RPT electrical independence from the existing RTS.

Reply: The ARI and RPT are independent from RPS power from the motive power selection to the final actuator. ARI and RPT circuits are divisionally powered and the circuitry is run in the respective divisional tray / conduit system which is separate and independent from the RPS tray / conduit syctem.

i l Enclosure to NRC-88-0113 Page 3 i i  !

' i Question 7: Identify and describe the physical independence of the ARI system from the existing RTS. i i

Reply: The ARI and RPT systems are installed divisionally as ECCS  !

divinional designs typical of a BWR. As a result, the ,

, ARI/RTP system is physically independent of the RPS system '

3 from instrument rack to final actuator.

i i  !

Question 8: Identify the quality assurance provisions for the ARI/RPT  !

equipment. Verify compliance with Generic-Letter 85-06.  ;

Reply: All of the hardware included in the'ARI design from sensors I

to final actuators (solenoid valves) have been purchased as .

' QA1 equipment. Refer to answer for Question 15 for RPT  !

j equipment. The design is in compliance with Generic Letter l g 85-06. 6 I i i

) Question 9: Identify the power connections for the ARI system, verify independence from the RTS and the ability to perform its i function with a loss of offsite power.

Reply: Motive and logic power for the ARI and RPT systems is  !

j obtained from the Class IE divisional batteries. These l batteries are properly sized to provide power for all '

required design functions. The RPS is an AC powered system

which is independent from the Class IE divisional batteries. .

i 1 2

i Question 10: Identify and describe ARI testability at power and the bypass j criteria employed for the testing.

]

Each channel is tested individually at power. No bypass is used. An overall functional test must be performed during shutdown to avoid reducing unit availability.

i Qerstion 11: Verify coincident logie design is employed for ARI design and

identify the ATWS actuation setpoint utilized to avoid the challenge to the RTS scram, j

i

] '

Reply: As shown on the FCD attached with this submittal, a coincident 2 out of 2 logic per division is utilized on both l 1evel and pressure.  ;

i  !

i i

d l

l 1

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• 7*#Fer--v- w m ee --+-ey- mM-pCy*yg-= gverei 4 m-- fwg-i

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Enclosure to  !

NRC-88-0113 i Page 4 4

e A pressure setpoint of 1133 is used for the high pressure ARI/RPT actuation compared to the 1068 psi high pressure scram setpoint.

j The level setpoint of 110.8 inches above the top of active '

fuel is used for ARI/RPT actuation while RTS uses 173.4

t inches above the top of active fuel.

1 l Question 12: Identify and describe the manual ARI/RPT initiation i capability.

A manual ARI initiation can be achieved by jumpering and/or manipulation of the trip unit output. The recirculation pumps can be manually tripped using CMC control switches.

Question 13

Provide a listing / description of ARI/RPT readouts.in the  ;

) control room. -

The level and high pressure trips are alarmed in the control room. A recirculation pump field breaker trip is alarmed in j the control room also. Each of the eight (8) ARI valves have ,

position status lamp (open/cloced) on the control room panel ;

603.

l. ,

) Question 14: Verify the ARI system has the ability to complete its  !

f protective action. i Reply: The ARI system is sealed in upon initiation and will remain in operation until it is reset. ,

4 j Question 15: Describe the RPT system and identify the separation, 1

independence, power source, testability at power,

~

environmental qualification and compare the design with NRC previously approved generic designs, i

Reply: Fermi has installed the "monticello design" as described in NEDE-31096-P. The power source is divisional de battery 1 power. Separatien and independence are obtained by j

installing the system as a divisional ECCS design. Each channel is tested individually at power. No bypass is used.

i

' An overall functional test must be perforced during shutdown to avoid reducing unit availability. All of the hardware is qualified for the normal expected environment and has been procured as QA1 with the exception of the trip coils.

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