ML091380434
| ML091380434 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 04/15/2009 |
| From: | AREVA NP |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TSC 2007-09, Suppl 16 | |
| Download: ML091380434 (15) | |
Text
SM-0902 TXSRTEPA M
Change Enable Overview TXS RTE PARAM Change Enable Design - April 15, 2009 1
Hardware specific details of the TXS RTE Parameter Change Enable Keyswitches SM-0902 Logic Overview
" Input Logic
" Parameter Change Enable Logic
- Latch Logic Illustration for Parameterization o RTE Modes of Operation o RTE Mode Change illustration for Test/Diagnosis
- Output Status Logic SM-0902 Failure Modes
- Failure Modes as described in RAI Response to EICB 106.
TXS RTE PARAM Change Enable Design - April 15, 2009 2
TXS RTE Param Change Enable FTI&I "tches Yýayswi Three (3) RPS/ESFAS Channels A/Al, BIB1, Parameter Change Enable Keyswitches:
and C/Cl Two (2) RPS (only) Parameter Change Enable Keyswitches:
Channels D and E/MSI Three (3) ESFAS (only) Parameter Change Enable Keyswitches:
Channels A2, B2, and C2 One (1) ESFAS ODD Voter/Status Parameter Change Enable Keyswitch One (1) ESFAS EVEN Voter/Status Parameter Change Enable Keyswitch Same key code for a solitary ONS unit, different key codes across the three ONS units Keys are non-removable in the ENABLE position TXS RTE PARAM Change Enable Design - April 15, 2009 3
TXS RTE PARAM Change Enable Design - April 15, 2009 3
TXS RTE Param Change Enable Keyswitches (3ým (D rii To ESFAS Status Computer 24VDC L!L S30_]L S430 RPS Channel D or E/MSI.
Keyswitch input signal to TXS ESFAS Voter ODD F1/F2 and ESFAS Voter ODD Status H Keyswitch input signal to TXS or ESFAS Voter Even G1/G2 and EVEN Status I Keyswitch input signal to TXS ESFAS Channel A2 or B2 or C2
ýeyswitch input igna+t0A&TCM Enable Design - April 15, 2009 E
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TXS RTE PARAM Change Enable Design - April 15, 2009 5
Input Processing I
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Input Representation I
1PPSFU0902A 1PPSFU0902B 1PPSFU0902C 1PPSFU0902D I
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Of r-xi Chang ý Enable SO-0000, FU-0001, FU-0003, FU-0004, FU-0005, FU-0006, FU-0007, FU-0008, FU-0009, FU-001 0, FU-001 1, FU-001 4, FU-0015, FU-0016, FU-0017, FU-0019, SI-0703
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To Param Change Logic TXS RTE PARAM Change Enable Design - April 15, 2009 6
Parameter Change Enable Logic From Input Processing Logic r ---------------
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7XS RTE PARAM change Enable Design - April 15, 2009 7
7XS RTE PARAM Change Enable besign - April 15, 2009 7
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Case 0: Cyclic Operation, Keyswitch OFF 7XS RTE PARAM Change Enable Design - April 15, 2009 8
7XS RTE PARAM Change Enable Design - April 15, 2009 8
0!.Fc Latch Lcýý7.
Case 1: Cyclic Operation, Keyswitch ON TXS RTE PARAM Change Enable Design - April 15, 2009 9
F Latch Louic Case 2: Parameterization I
I 7XS RTE PARAM Change Enable Design - April 15, 2009 10
Latch Lc 0
Case 3: Parameterization, Keyswitch OFF TXS RTE FARAM Change Enable Design - April 15, 2009 11 L w9mIt-11-3 1,!
TXS RTE PARAM Change Enable Design - April 15, 2009 11
TXS _u"7717 Modes of 0,ý,7eration with-cyclic processing of RI w
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Test operation of FDGs, setting of signals I
RTE-INPUT Enable Operation Enable Parameterization Enable Function Test Enable Diagnosis TXS RTE PARAM Change Enable Design - April 15, 2009 12
RTE Mode Changes
.B-PARAM02; 01 4-PARMID!
RTE - INPUT Enable Operation Enable Parameterization Enable Function Test Enable Diagnosis Initiation by Service Unit(additional key release required)
Automatic Transition 7XS RTE PARAM Change Enable Design - April 15, 2009 13 TXS RTE PARAM Change Enable Design - April 15, 2009 13
OutputlStatus Logic I
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I Surmmary Alarm/St~atus Logic I
TXS RTE PARAM Change Enable Design - April 15, 2009 14
Failure Modes There are 6 types of Failures that can occur affecting the Safety Channel SM-0902 software or SW Parameters: This is a summary of the responses to open item 19 evolving into EICB 106 Failure of the Parameter Change Enable Keyswitch S430 Module Failure Random bit error in RAM (Changeable Parameters affecting safety functions)
Random Bit error in RAM (affecting Runtime Environment)
Stuck bit in RAM Bit error in FEPROM
-No single failure allows undetected access to the safety processors or undetected changes of processor modes of operation TXS RTE PARAM Change Enable Design - April 15, 2009 15 TXS RTE PARAM Change Enable Design - April 15, 2009 15