ML20141P118

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Analysis to Evaluate Electrical Protection Assembly & Inverter Circuits
ML20141P118
Person / Time
Site: Clinton Constellation icon.png
Issue date: 11/13/1985
From: Garg T, Green W, Milaninia A
ILLINOIS POWER CO.
To:
Shared Package
ML20141P115 List:
References
11-2031-(1), NUDOCS 8603190031
Download: ML20141P118 (9)
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.-.........._---~: .;^ p s, - ~ - -. -. .g,y,s; y * , _,,UE_ ~ ANALYSIS TO EVALUATE .e. og' @Q.p f.;*;i. o '.' M 1 "r ELECTRICAL AND FUNCTIONAL ',.?e 1 ',.*'**),.. )l *,, 'i *'e e N. ~ INDEPENDENCE OF ELECTRICAL PROTECTION ASSEMBLY AND IINERTER CIRCUITS CLINTON PROJECT F0VEMBER 1985 Mfah_ ll/G/F5' Prepared By: [L A. Hilantnia, ESE Reactor Instrumentation and Protection Design HC 023, Ext. 5-76D1 $ Y,. W h s u // $s/O ' Reviewed By: W. K. Green, LSE Plant Electrical Systen Engineering MC 045, Ext. 5-1841 Y U/ 3lJb" WV T. L. Garg, Principal Engineer Plant Electrical System Engineering M/C 046, Ex. -3751 l / /% A og / -

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,;y:Mly g 1.0 ,PI'RP0eE .w. 7' Perform an analysis to demonstrate that tne present desi0n configuration of inverter and electrical protection assembly (EPA) in C71-5004A&B (UPS) conforms to Safety Evaluation Report (SER), paragraph 8.3.1 Page 8-11 for the intended electrical and physical independency in the design. i 2.0 SCO,PE P During the NRC site walkdown visit on October 30, 311985 it was pointed (DTF JK-566) out that':the C71-$004A & B hardware installation doesn't meet.the inverter and EPA independency as stated in the SER, ~ "The staff has expressed concern on past GE BWR RPS power supply designs that abnormal voltage or frequency conditions on the output of the non-Class 1E power supplies could cor. promise the fail safe design of the RPS solenoid circuits. The specific concern was conformance of the design to GUC 2 (seismic cepability) and GDC 21 (single failure). This concern was satisfied in the previous designs by the addition of redundant Class IE overvoltege, undervoltage, and underfrequency protective relaying in the cutput of both the normal (nun-Class IE HG set) and alternate (non-Class 1E) power supply to the RPS circuits. The Clinton design setisfies this concern by utilizing a Class IE qualified inverter and electrically independent Class IE power monitor in the normal output to the RPS circuits." The scope of this analysis is to evaluate compliance to the above SER position through review of the following conditions: 1 The electrical independence of the inverter circuit and EPA. The functional indeoendency of invertor and EPA. 11-2031 (2) r

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~ Card Caos Assembly Confiouration (See Figures 1 and 4) 3.1 The uninterruptible Power Supply (UPS) card cage consists of individual PC boards; Charger Logic (J1), Alarm logic (J2), Oscillator Board (J3), EPA (J4)', Invertor Analog logic (J6), and The EPA card (J4) Invertor Pulse Width modulating logic (J7). is located between the oscillator board (J3) and the Invertor Analog Logic (J6). The oscillator board J3 and the inverter The logic consist of circuits of low voltage and low current. EPA card J4 senpas and monitors the output power of the inverter on the Bypass Power Source,, provides alarci functions,.and switching for the undervoltage coil of the EPA breaker. 3.2 Control Vicino Conficuration The EPA & inverter card cage control wiring are isndled together. FAILURE HODE AND EFFECTS ANALYSIS (FMEA1 4.0 The malfunction, as a result of single failure of inverter components will not be propagated to degrade the EPA function and vise versa. The electrical & functional configuration of the inverter & EPA is addressed in this analysis. ) Electrical Independency of Inverter & EPA 4.3 Prior to NRC walkdown visit the Field Problem Report (FPR) 510B was In response to this FPR, F00R LH1-3001. Rev. 2 initiated on 5/31/85. was initiated to make inverter & EPA electrically independent. f After the implementation of FDDR, there is no electrical sharing of components, control signals or power sources between EPA and inverter Therefore, any failure on the inverter would not effect the EPA performance and vice versa. a 11-2031 (3) 1, ,__.-,_y,, y..- f--,_--,,.y-.y_ _ - - - - -,...

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. Functional Independency of Inverter _Q 4,Y The EPA and inverter cardt, although mounted in the same card cage, can be considered fenctionally independent because a single failure on a logic card, or cf a component connected to a logic card, will not cause unsafe failure of both the EPA and inverter circuits. All components on the logic card are of low voltage and/or low current devices except the transistors driving relay K2 and the undervoltage coil of circuit breaker CB3. A short circuit in relay K2 or undervoltage coil may causa the full 125 VDC to be applied across the current limiting resistor in the circuite, The current limiting resistor will be overheated to cause an open circuit (act like a fuse), thereby preventing long term heating of the card cage and damage to the other cards. This fuse type failure will not affect the adjacent components. For fault conditions (hot short and ground short condition) that may cause damage to wires, cunsideretion was given primarily to the possible f ailure of components in circuits monitoring, or powered by,125 VDC or 120 VAC, since these are the only high energy, unfused power signals in the wiring bundle to the card Due to the mechanical layout (location of connectors and cage. spacing of pertinent pins within connectors), and the sizing of the printed circuit wiring of the backplane and the PC cards, all postulated faults on the backplane, or on a card in the card cage assembly, does not result in damage to the wiring. Any I fault condition on the backplane, or on a PC card in the card cage assembly, that results in a current of sufficient magnitude to cause cable damage, would first cause failure (open circuit) of the printed circuit wiring on the backplane or on a printed circuit card (" fuse like" at.t. ton of this small giuge wiring). j I ) 11-2031 (4) i f l i

FROM SE. EDE sJ 4344 ,a.- i For loose wire faults. consideration was given to connector location, and relative position between pertinent ; ins s.' thin a connector and between adjacent connectors. The relative positions of the backplane connectors, and of the signals on each connector pin, is such that one loose wire will not fall on another connector pin and cause failure of both the EPA and the inverter (see Figure 1), The low voltage control power is fused in either the DC to DC converter or by fuse F8 on the I/O Assembly (see Figures 2 & 3) S Any open An open gircuit represents a fail safe condition. circuit condition in the inverter or EPA will initiate a trip t signal which is a safe condition. 5.0 CONCtVSION This analysis denonstrates that electrical and functional independ-l ency built into the inverter and EPA design is adequate to comp y 5.1 with the SER paragraph 8.3.1 page 8-11 position.

6.0 REFERENCES

IPC DTF # JK-566. 6.1 ] l 11-2031 (5) i ]

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