ML20198N543

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Addendum to CEN-315 Summary of Diversity Between Reactor Trip Sys & Auxiliary Feedwater Actuation Sys for C-E Plants
ML20198N543
Person / Time
Site: Satsop
Issue date: 05/31/1986
From:
C-E OPERATING PLANTS OWNERS GROUP
To:
Shared Package
ML20198N523 List:
References
CEN-315-ADD, NUDOCS 8606060120
Download: ML20198N543 (9)
v • d • e


Text

ADDENDUM TO REPORT CEN-315 PROVIDING INFORMATION FOR THE WASHINGTON NUCLEAR PROJECT UNIT 3 PLANT MAY, 1986 i

l CEN-315: Summary of the Diversity Between the Reactor Trip System and the 1

Auxiliary Feedwater Actuation System for C-E Plants f

6b0b0 PDR b

1 TABLE J-1 WASHINGTON NUCLEAR PROJECT UNIT 3 COMPOSITE OF DIVERSITY COMPARISON COMPONENT FUNCTION COMPONENT DIVERSITY NOTES Sensor Yes 1,2,3,4,7 Bistable Yes 1,2,3,7

Bistable Relay Card Yes 1,2,7 Matrix Relay Card Yes 1,2,7 Initiation Relay Yes 1,2,5,7 Actuation Logic And Devices Yes 6,7 1

i l OVERALL DIVERSITY CONCLUSION 1

Washington Nuclear Project Unit 3 (WNP 3) comp 1f a with the ATWS rule in terms of diversity between the reactor trip function and the emergency feedwater actuation function. This is due to diversity of design and function between the two systems. Additionally, WNP 3 is equipped with a Supplementary Protection System (SPS) which has been designed and implemented to be totally diverse from the emergency feedwater actuation l system and totally diverse from the existing reactor trip system up to the 4

final actuation device.

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1 i

Notes for Tables J-1 and J-2

1. WNP-3 is equipped with a Supplementary Protection System which consists

, of Supplementary Protection Logic Assemblies (SPLA) . Each of the SPLA is i

designed to be diverse with respect to the Reactor Protection System, and therefore the Auxiliary Feedwater Actuation Function. The following design differences between these systems are outlined as follows:

Manufacturing Diversity - Different vendors were used, which produced a i different design, different system production techniques, and different testing procedures.

System Part Diversity - The vendors used different components for the SPLAs and the RPS.

I Cabinet Diversity - The EPLA uses one wall mounted, natural convection cooled cabinet per channel (4 channel system). The RPS cabinets are a floor mounted, forced draft cooled design.

Electrical Diversity - Each SPLA channel is electrically isolated and separated from the others.

There is no cross channel communicaton between -

SPLA channels or between the SPLA and the RPS.

1 j Initiation Logic Diversity - The RPS and the SPLA utilize different designs for the initiation logic.

Transmitter Diversity - The transmitters are produced by different i manufacturers. Both the RPS and the SPS, however, monitor the pressurizer pressure via a common tap per channel in the pressurizer. The ATWS rule,

' however, requires that diversity exist from the sensor output. The instruments do have separate shut-off valves and a common root valve per x

channel.

l Power Supply Diversity - The SPLA uses a custom-built module power i

supply that is diverse from the RPS power supply .

i Human Fectors Diversity - The SPLA uses wall mounted cabinets that are smaller than the RPS cabinets. Each SPLA channel in its own cabinet, front panel controls are in different locations than those for the RPS, adjustment controls for the test and setpoint voltages are different than those for the RPS, and the SPLA front panel has fewer test points than the RPS.

2. There is diversity between the react trip function and the auxiliary feedwater actuation function. The act ution parameter for the reactor trip is high pressurizer pressure. This is true for both the Reactor Protection i System and the Suplementary Protection System. The actuation parameter for the auxiliary feedwater actuation function is low steam generator

-level .

._ . - . _ . _ . . . . ...-,,._,,...___._....._m,_. . - - , . . _ _ -

~-

?

i

)

Notes for Tables E-1 and E-2 (continued)

3. High pressurizer pressure is the input to both the reactor protection system (RPS) amd the core protection calculators (CPCs). The CPCs initiate trips independent of the RPS bistables density and the DNBR bistable relay cards in the plant protection system. In addition to the high pressurizer pressure signal, the CPCs in each channel (4 total) also receive a signal for reactor trip from the high cold leg temperature sensor which initiates a reactor trip upon conditions inidicative of an ATUS.

j 4.

The ATUS rule requires diversity only from the sensor output.

j Diversity in the actuation parameter further enhances the diversity between the reactor trip function and the auxiliary feedwater actuation  ;

function. This minimizes the probability of a common mode failure between the two functions.

  • l'
5. Although the initiation relays are made by the same manufacturer

' and have the same design principle, they have different model numbers.

This indicates that there is a level of diversity between the two systems ~

for the initiation devices.

j

6. The actuation logic has diversity in manufacturer (G-E and 'f for the RPS and Potter and Brumfield for the AFAS), design principle (mechanical latch for the RPS versus rotary relays for the AFAS), and D.C. power source (125 VDC for the RPS versus 36 VDC from the 120 VAC for the AFAS),
7. Review of the existing system indicates that the failure of any power source will result in a fail safe mode, (i.e. tripped for the I

reactor trip function and actuated for the auxiliary feedwater actuation function). Redesign of the functions with diverse power supplies would I

not affect the fail safe mode.

i.

I l

i i

)

6 t

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