ML19332C563

Provides Advanced Change to Be Included in Future FSAR Amend Dealing W/Criteria for Loading Cable Trays Above Side Rails

ML19332C563
Person / Time
Site:	Comanche Peak
Issue date:	11/17/1989
From:	William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TXX-89810, NUDOCS 8911280279
Download: ML19332C563 (10)

Text

M ,

M L EE C Log # TXX 89810 File # 10010

= = 908.3

• • # ***'"'*' #(b' filELECTRIC November 17, 1989 l Lurcwne Vke l>esident i~

s' O.-S. Nuclear Regulatory Commission 4 Attn: Document Control Desk ,

Washington, D C. 20555

SUBJECT:

COMANCilt PEAK STEAM ELECTRIC STATION (CPSES)  ;

DOCKET NOS. 50 44L AND 60-446 ADVAECE FSAR SUBMITTAL i CRITERIA FOR LOADING CABLE TRAtS ABOVE SIDERAILS e Gentlemen:

• This. letter providc3 en advance copy of changes to be included in a futare l FSAR ameidment dealing with criteria for loading cable trsys 6bove siderails.

In order to facilitate NRC staff review of these changes, the enclosure is organized as follows:

1. Draft revised FSAR pages, with changed portions indicated by a bar in the margin. as they are to appear in a future amendment (additional pages immediately preceding and/or following the revised  ;

pages are provided if needed to understand the change).

2. A line by-line description / justification of each item revised

3. A copy of related SER/SSER sections.

4. An index page containing the title of " bullets" which consolidates <

and categorizes similar individual changes by subject and related SER section.

5. The bold / overstrike version of the revised FSAR pages referenced by the description / justification for each item identified above. The ,

bold overstrike version f acilitates review of the revisions by highlighting each addition of new text in bold type font and -

overstriking with a sinsh (/) the portion of the text that ir deleted, t

8911280279 891117 f

.hOgh PDR ADOOK 05000445 A PDC \,\

P. O. Box 1002 Glen Rose, Texas 7600-1002

TXX 89810

, November 17, 1989 Page 2 of 2 This change has been evaluated under the TV Electric 10CFR50.59 procedure per

TXX 89718, dated September 28. 1989. This evaluation is available for your I

review.

If you have any questions regarding this submittal please contact Joe Harnden at (214) 812 8226.

Sincerely, ,

William J. Cat.ill, Jr.

i

)

By:

D. R. Woodlan Docket Licensing Manager >

WJH/vid c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3) h 1

?: . , ,

t 'i Enclosure to TXX-89810 (

November 17, 1989  ;

i t

. Advance FSAR Change Regarding Criteria for' s Loading Cable Trays:Above Sidera11s ,

. Item 1  : Draft Revised FSAR Pages pg. 2 thru 3 l kh Item 2 . Description /Justiftcation- pg.'4  ;

' Item 31 Related SER/SSER Pages pg. 5 i

. item 4 Index Page Containing the- pg. 6 -

Title of " Bullets" -

Item 5 Markup of Existing FSAR Pages pg. 7 thru 8

.s

+ t t

Pg. 1 of 8 e

1 0

e 9

L l

l

'I .

I

's

Enclosure to TXX-89810  !

Page'2 of 8 ,

.. CPSES/FSAR  !

4. Load factor of 100 percent in ductbanks  !

5. Grouping derating ,

f

6. Load diversity  ;

, 7. Derating for fire stops and tray covers B. Ambient temperature

• The cable type and cable insulation are selected te minimize the rate of deterioration during' the design life of the plant as a result of temperature, humidity, and radiation. Environmental Type Tests are i

performed on cables that are required to function during and following a LOCA.

Cable tray fill criteria generally limit the summation of the cross- 66 sectional areas of control / instrumentation cables and power cables to a maximum of 40 and 30 percent, respectively, of the usable cross section of the tray. However, these percentages may be exceeded provided the following conditions are satisfied: 9 l

L l

1. Cables do not extend above the side rails of the cable tray except as allowed below.

g jl[lfFl' l ,

2. For power cables - the thermal rating of the cable is not 9 i exceeded.

o ,

3. Cable tray support design is adequate.

l 9 Cable tray fill for power cables, when sized for maintained spacing, 66 is limited to the requirements of IPCEA P-46-426.

L 8.3 91 ,'

1

! >- i

. . . , _ _ ~ . . _ . . _ . _ , _ . _ . _ . _ . _ , _

Encics:re to TXX-89810 Page 3 of 8. CPSES/FSAR f

g Cable trays may have cables extending above the top of the cable tray siderails. Cables may extend above the top of cable tray siderails 42 if the situation does not result in an electrical or mechanical separation problem and the cabits are not routed near potential i hazards which may cause physical damage to the cables.

i 66 Conduit fill for power, control and instrumentation cables is  ;

limited to the requirements delineated below:

66 66 Number of contained cables 1 2 3 or mon 66 Percent _ Fill tinit $3

_ 31 40 .

66 However, these percentages may be exceeded provided the following  ;

conditions are satisfied:

l 66 1. Cable pulling tension is not exceeded. ,

66 2. For power cables - the thernal rating of the cable is not exceeded. ,

66 3. For fire seal application the limits of conduit fill for the qualified seal are not exceeded.

l L ,

l 8.3-92

telcsura to Txx 89810 CPSES FSAR NENDMENT f> age 4 of 8 -

,, DETA! LED DESCRIPTIDN t

FSAR Page (As amended) fircun Descrintion  !

I 8.3-91, 92 2 Revises criteria for the loading of cable trays above siderails.  ;

Revision: '

The criteria for the loading of cable trays above '

siderails is revised by correcting the caole tray fill '

• criteria description to ar. count for the exception and .

to remove the list of situations which "may" require

' cables to extend above the siderails, making the  :'

criteria more general and less confusing. The criteria to not extend cables above the siderails 1 of cable tray was based on good workmanship and general construction practice. TU Electric can ,

find no technical basis for this requirement not already addressed by other criteria such as thermal >

rating for power cables, cable tray support design, ,

fire protection, or cable separation criteria. Due to i specific installation configurations, cables will extend above the siderails. The deleted list provided several areas where this is expected to occur but, for such areas as the cable spreading room, space limitations may also require certain straight runs of tray to exceed the siderails, even after reasonable means of rerouting cable or extending siderails have been used. Since some areas of the plant such as the turbine building were not reinspected, it is possible for other areas of the plant to have installations ';

where cable extended above the siderall. Since repulling cables, running new cable tray or extending  :

siderails requires major rework, with the potential to  :

damage cables or to restack them in a less organized  :

manner (i.e., even higher in the tray), and since there l is no safety benefit to be derived (since safety concernsareaddressedbyotherexistingcriteria)TU Electric has chosen to revise this criteria to be  :

clearly generic. The requirements ensuring electrical and mechanical separation and avoidance of physical damage hazards will be maintained whenever the siderails are exceeded. This change has been evaluated  !

under the TV Electric 10CFR50.59 procedure per '

TXX-89718, dated September 28, 1989, i FSAR Change Request Number: 89-763 J Related SER Section: 8.4.6 4 SER/SSER Impact: Yes New criteria has not been reviewed by NRC.

l 4

, s , ---r-.e ,,, n.- =~

4 Enc 1cstrotoTXX-89810  :

'{Pagt5of8 l m n .

8 i  ;

t The design provides for the automatic disconnection of all nonsafety. loads connectedtothe6.9-kVand480-Vswitchgearupondetectionofasafetyinjec- l tion signal except the following: . i t  !

(1) radiation monitoring system l

, (2) fire detection system l

-.. (3) security system  !

. (4) communication system -

(5)' ennunciator logic cabinet f

r. (6) chlorine detection system t

These non-Class IE loads are connected to Class 1E buses via isolation devices  !'

which are constant voltage transformers and are subject to Class IE qualifica-tion. These transformers are designed for continuous current-limiting opera-

• tion with a phase-to phase, three phase, or phase-to ground fault at the output of the secondary windings. The transformers input current under short-circuit conditions is limited to 150% of rated. The maximum current limiting 4 input has been considered a continuous load for sizing the diesel generator

, and all distribution equipment associated with the isolation transformer to ensure that no failure in the non-Class IE circuits will cause unacceptable influences in.the Class IE circuits. The staff finds this aspect of design ,

acceptable. '

When a Class 1E contact performs a non-Class IE control function (such as energizing a solenoid for a non-Class 1E valve), isolation is provided by an auxiliary relay. When a Class IE contact performs a non-Class IE monitoring function (such as activating an alarm or input to a computer), an isolation is ,

provided by a phototransistor coupled pair (LED and a transistor).

Based on its evaluation of the information provided by the applicant, the staff concludes that the design provides for.the automatic disconnection of  ;

- nonsafety loads connected to the 6.9-kV and most of the 480-V buses upon detection of an ESFAS signal in accordance wih Regulatory Guide 1.75 and is, -

therefore, acceptable. Use of isolating transformers as current-limiting i isolation devices to the rest of the 480-V switchgear meets the requirement of isolation devices per IEEE-384-1977 and is, therefore, acceptable.

8.4.6 Fire Protection Special requirements for the plant electrical systems to satisfy Appendix A to BTP APCSB 9.5-1, " Guidelines for Fire Protection of Nuclear Power Plants," will be reviewed later during the fire protection review. After this review.

) additional recommendations may be proposed to further improve the capability of the electrical systems.

4 l

8-17

m n _jj ,s ,

_w'* - - f'.R w

e ,_

. , ,y ,

' " i 5_. 'i T'4 +

+

.. 1l$aeleeuwe teitnetgtig 9 '

%e', >[ .'.

,Jg -= , -8.;

s.,.v. .

e. e/g;ct . . ,,

e ,

w: ;p..a ,. - ,

Q n {+ I 4) L:pQ. y > ,c_ '_

h c

lyT' 4'l.-:

y g

' *' , L3,4,6-- t Fire Protection <

~

.i j W ,

4 3.,

m n-

' 4.' Relaxation of-cable tray-fill' criteria-

'te Perett loading d ue t h sidere1 A q- ,/' 6 9- .t-T , -

g

, _'s'. .,o y '

i t '

4 ,j

't t1 i g 9 I I ( 1 e _.

> n f,

g, . ., e<{ l,

c.. ,

,f, ..

~

+ r ;1 3 4

- ( "_ ( W.

y y_ A*' ,

+ d 1 3 7 1

Kei5 y $

b

.. t g '

1

..f : ' f,

+1 , >

3

t. ,

4

?q- .t

.~

<-lj--. ,

f' h s t

,- h .

L p i 4-)

s

..,.y .

4 '

• + :1 + , g g ;;.x/ fz , ,

< t "!

r:

\;f ; _. , l;h

^{

o- 1> '

4 3 ')-

4 d 'I

') p' .

.. 1

p

+,- i

, ,~

. g

.; } ';

5 h

t i 7 .

+ -

g e

^# .".y) p' i.4 4

. ' lI -

E

[' i si._ ._,

-?  : e

g. '

9

'f i ,

g

?,< :t

' i.

lN, 7 e .)

-.N,.'

4

.m ,

3-

'f 4 ,' - ..-# '

.o 1,

.;;, V '. .

. I l' ,, . '!

.:,.Y t I v ,

' i 4  ;

p

• s

.i s 2

.Y

, -  ; -b_E  ! ^{

s c_ v ., ~ _;

• lh ' 0?

p6. '!-

jg '

.- y

_.... ~ , . . - _ . - - - . _ . . . - - - - . ~ . . . - . . . ,-

I' h Encics;re to TXX*89810 Pagt 7 of 8 CPSES/FSAR

4. Load factor of 100 percent in ductbanks l

5.. Grouping derating  ;

I

6. Load diversity L

7. Derating for fire stops and tray covers l* 8. Ambient temperature The cable type and cable insulation are selected to minimize the rate i of deterioration during'the design life of the plant as a result of temperature, humidity, and radiation. Environmental Type Tests tre performed on cables that are required to function during and following a LOCA, Cable tray fill criteria generally limit the summation of the cross- 66 sectional areas of control / instrumentation cables and power cables to a maximum of 40 and 30 percent, respectively, of the usable cross section of the tray. However, these percentages may be exceeded '

provided the following conditions are satisfied: 9 +

1. Cables do not extend above the side rails of the cable tray 9  :

except as allowed below. '

2. For power cables - the thermal rating of the esble is not 9 exceeded, t

3. Cable tray support design -is adequate. 9 Cable tray fill for power cables, when sized for maintained spacing, 66 is limited to the requirenents of IPCEA P-46-426.

j l

\

8.3-91 Bold /0verstrike l Version  ;

l

E: closure to TXX 89810

's Page 8 of 8 CPSES/FSAR 42 ' Cable trays #1/K $/A fpf gifffill/A may have cables extending above the top of the cable tray siderails $f / ///#J5 pf //ft/flg .

l /f$f$11$51 % iffil6AY$llffl. lYll $11$$5/ff M1 fifff $$ flNil

/ fMH #f f$111/5/11 M fHlf 1Hf 11111M $MM $1 ffit $M fffttftl i $M Mjf flHMM $$1M$ fM f#1/11 Cables may extend above the top of cable tray siderails if the situation does not result in an electrical or mechanical separation problem and the cables are not routed near potential hazards which may cause physical damage to the cables.

66 Cor.duit fill for power, control and instrumentation cables is limited to the requirements delineated below:

66 ,_.

66 Number of contained cables 1 2 3 or more 66 Percent fill limit 53 31 40 66 However, these percentages may be exceeded provided the following conditions are satisfied:

66 1. Cable pulling tension is not exceeded.

66 2. For power cables - the thermal rating of the cable is not exceeded.

66 3. For fire seal application the limits of conduit fill for the qualified seal are not exceeded.

i Bold /0verstrike 8.3-92 l Version