atw 2018-02

inforum

atw Vol. 63 (2018) | Issue 2 ı February

OPERATION AND NEW BUILD 100

| | Fig. 4.

Parameter attribute problem model for fire damage to the cable.

the event of fire; i.e., they have a

high ignition point and low release

of heat. The conductivity of the cable

helps to maintain its structural integrity

[NUREG, 2010]. The first

physical contradiction appears when

the temperature exceeds 100 °C.

There are four steps that can be taken

to combat this: spatial separation,

temporal separation, condition separation,

and separation of system

levels. These are used to perform

separation of fire areas, cable burn

time, burning conditions, and safe

shutdown system levels (Figure 4).

All cables must remain reliable

along their entire length in order to

ensure a safe shutdown. The fact that

fire damage can compromise

reli ability leads to the second technical

contradiction.

We constructed a 39X39 contradiction

matrix to be compared with

the 40 Inventive Principles based on

the problem model established on

structural attributes and parameter

attributes. Comparison of temperature

and reliability resulted in the

selection of the following inventive

principles:

# 3: Local quality

#10: Preliminary action

#19: Periodic action

#35: Parameter changes

A panel of experts decided to disregard

Principle #19. Principle #35

was not applicable because the cables

had already been laid. Principles #3

and #10 were implemented for

reasons outlined in the following:

Inventive principle #3 (local quality):

3a. Change an object’s structure from

uniform to non-uniform, change

an external environment (or

external influence) from uniform

to non-uniform.

3b. Make each part of an object

function in conditions most

suitable to its operation.

3c. Make each part of an object fulfill a

different and useful function.

Improvement requirements and

feasible methods

(1) Cables from Series A and B should

be separated by at least 20 feet.

(2) Built-in discrete fire detection

systems should be included in all

areas. In the original design, FZ 1

and FZ 17 each had one feedback

system; however, they are now

segmented into a feedback loop for

each area [Generic Letters, 1983].

(3) Install close-spaced, open-head

sprinklers. According to GL 83-33,

Position 2: “In many plant areas,

the erection of physical barriers

between redundant shutdown

systems is precluded by the location

of cable trays, HVAC ducts and

other plant features. In such situations,

the staff has accepted, in

concept, the use of an automatic

fire suppression system which

No.

Cable

No.

SSD

Code

Cable

Code

SSD

Equipment No.

SSD

Path

SSD

Cable Type

Raceway

No.

Rway

Code

1 B1EAPHBC2XA K2 EE6 B-AP-LT201 HSD-P2 HSD-S B1EZJF4TXBA WC

2 B1EBNHAC2XA K2 EE6 B-BNLT961 HSD-P2 HSD-S B1EZJF4TXBA WC

3 B1EEFHAC2XA H2 EE6 B-EF-PT201 HSD-P2 HSD-S B1EZJF4TXBA WC

4 B1EEFHAC2XB H2 EE6 B-EF-PT202 HSD-P2 HSD-S B1EZJF4TXBA WC

5 B1EEFHCC3EA H2 71M3 B-EF-P105 HSD-P2 HSD-S B1EZJF4TEBA SC

6 B1EEFHCC3EB H2 71M B-EF-P105 HSD-P2 HSD-S B1EZJF4TEBA SC

7 B1EEFHCC4EA H2 71M3 B-EF-P106 HSD-P2 HSD-S B1EZJF4TEBA SC

8 B1EKJHBC3LA D2 938 B-KJ-P147 HSD-P2 HSD-S B1EZJF4TPBA SE

9 B1EKJHBC4LA D2 938 B-KJ-P148 HSD-P2 HSD-S B1EZJF4TPBA SE

10 BIEPGHHCEHH E2 91I3 B-1E-PG-S01-07 HSD-P2 HSD-S B1EZJF4TIBA SA

11 B1EPGHHCEHJ E2 91I3 B-1E-PG-S01-07 HSD-P2 HSD-S B1EZJF4TIBA SA

12 B1EEFHBCBSB H2 939 B-EF-HV230 HSD-P2 HSD-S B1EZJF4TPBA SE

13 B1EEFHBCBSD H2 939 B-EF-HV230 HSD-P2 HSD-S B1EZJF4TPBA SE

14 B1EEFHBCBSE H2 939 B-EF-HV230 HSD-P2 HSD-S B1EZJF4TPBA SE

15 B1EEFHBCJSA H2 C77 B-EF-HV206 HSD-P2 HSD-S B1EZJF4TPBA SE

16 B1EEFHCC8SA H2 C27 B-EF-HV203 HSD-P2 HSD-S B1EZJF4TPBA SE

17 B1EEFHCC8SB H2 C27 B-EF-HV203 HSD-P2 HSD-S B1EZJF4TPBA SE

18 B1EEFHCC8SC H2 C27 B-EF-HV203 HSD-P2 HSD-S B1EZJF4TPBA SE

19 B1EEFHCC9SA H2 C27 B-EF-HV222 HSD-P2 HSD-S B1EZJF4TPBA SE

20 B1EEFHCC9SB H2 C27 B-EF-HV222 HSD-P2 HSD-S B1EZJF4TPBA SE

21 B1EEFHCC9SC H2 C27 B-EF-HV222 HSD-P2 HSD-S B1EZJF4TPBA SE

22 B1EEFHCCASA H2 C77 B-EF-HV221 HSD-P2 HSD-S B1EZJF4TPBA SE

| | Tab. 5.

Parameter attribute problem model for fire damage to the cable.

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

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