atw Vol. 63 ( 2018) | Issue 2 ı February
| | Tab. 3.
Examples of post-fire safe shutdown cable paths.
After referring to the parameters
associated with post-fire safe shutdown
equipment in the previous step,
the fire-induced circuit-failure effect
parameters and wire/circuit attributes
were compiled into a post-fire
safe shutdown circuit analysis table.
Four types of parameter were
required: 1) fire-induced circuitfailure
equipment, 2) operating status
parameters, 3) fire-induced circuitfailure
parameters, and 4) wire/
circuit attribute parameters.
Step 3: The regulations stipulate
special requirements for the wiring
involved in hot shutdowns; therefore,
the scope of the core knowledge was
defined as the wires associated with
post-fire hot shutdowns.
Step 4: We establish an inventory
of the wires involved in post-fire safe
Phase 4: Establish a path associated
with post-fire hot shutdown for
use as a reference based on the special
requirements in APP.R with regard to
wires associated with hot shutdown.
Step 1: Define the scope of core
knowledge and the wires associated
with post-fire hot shutdown.
Step 2: Set the relevant wire/
circuit parameters, equipment operating
status parameters, equipment
attribute parameters, and safe shutdown
Step 3: Refer to the existing wire/
circuit layout program SETROUTE in
the original design to derive the circuit
layout. The fire zones will need to be
updated, as the original layout
program uses the old fire zones. To
facilitate analysis, the fire zones,
equipment specifications, safe shutdown
paths, and operating status
parameters must be added to the database
of the wire/circuit layout.
Step 4: Establish an inventory of
wire/circuit paths involved in post-fire
Step 5: Establish the post-fire
alarm safe hot shutdown path form
(Table 3). Compile a report of wire/
circuit paths involved in post-fire safe
hot shutdown. The nuclear power
plant in the case study has two power
units. Unit 1 contains 1,189 wires and
17,379 items, whereas Unit 2 contains
1,184 wires and 17,233 items. Thus,
there are 2,373 wires associated with
post-fire safe hot shutdown. The
organization of the report is based on
the number system used for the safe
shutdown equipment, the attribute
categorization of the wires, their
origin and destination, the numbering
of the wire/circuit raceways, and the
fire zones through which they pass.
Phase 5: Construct the distribution
of post-fire safe hot shutdowns
throughout the entire plant.
Step 1: Define the scope of the core
knowledge and the post-fire safe hot
Step 2: Set the fire zones to their
Step 3: Based on the wire/circuit
layout program, identify the fire zones
through which each wire passes.
Step 4: Establish the distribution
of the post-fire hot-shutdown function
codes and replot the post-fire hotshutdown
tray routing diagram in
order to obtain an overview of the safe
hot shutdown capacity throughout
the entire plant.
Example: Series A is presented in
red and series B in green. The safe
shutdown cable path in the original
SETROUTE and corresponding function
code are used to obtain the safe
shutdown path and function code of
each fire containment zone (Table 4).
Phase 6: Establish a database of
items pertaining to basic fire prevention.
Basic fire prevention includes a
wide range of items: (1) basic data of
fire zones, (2) firefighting equipment
in fire zones, (3) fire dampers, (4) fire
doors, (5) combustion load of fire
zones, (6) list of fire zones adjacent to
each fire zone (7), inventory of heat
generated by all combustible items.
4.2 Application of TRIZ
The proposed knowledge management
approach revealed that fire
compartments 1 and 17 do not comply
with some regulations [10 CFR 50.48
APP.R]. Specifically, Wires involved in
post-fire safe hot shutdown must not
pass through the same fire compartment
without the implementation of
suitable fire protection measures. The
FROM No. Raceway No. FZ
B1EEFHCC8SA H2 B-EF-HV203 HSD-P2 HSD-S 1JZJP061E-F 1 B1EZJG2TSRH 20
B1EEFHCC8SA H2 B-EF-HV203 HSD-P2 HSD-S 1JZJP061E-F 2 B1EZJG2TUAG 20
B1EEFHCC8SA H2 B-EF-HV203 HSD-P2 HSD-S 1JZJP061E-F 3 B1EZJG2TUAF 20
FL FL No. HSD Path No. SSD Path
1 C101 D1 HSD-P1
1 C101 H1 HSD-P1
1 C101 I2 HSD-P2
1 C101 K2 HSD-P2
| | Tab. 4.
Example distribution list of fire alarm safe hot shutdown function codes.
| | Fig. 2.
Qualitative analysis model for identification
| | Fig. 3.
Standard solutions for eliminating harmful
effects of fire.
passage of series A and B wires
through FZ 1 and FZ 17 renders this
area vulnerable to fire damage [Hua
and Yang, 2006]. The structure of this
problem is modeled in Figure 2.
Figure 3 presents a qualitative
field model illustrating the association
between completeness and damage,
revealing the first problems to be
eliminated or controlled in a standard
In this case, the designers used
XPE/Cl.S.PE cables with heat
resistance of 90 °C. Their Q value
(Bench-Scale HRR per Unit Floor
Area) is 204 kW/m 2 , which means
that they are classified as safe, even in
OPERATION AND NEW BUILD 99
Operation and New Build
The Application of Knowledge Management and TRIZ for solving the Safe Shutdown Capability in Case of Fire Alarms in Nuclear Power Plants ı Chia-Nan Wang, Hsin-Po Chen, Ming-Hsien Hsueh and Fong-Li Chin