ML20126H538

Forwards Request for Addl Info Re Fire Protection for FSAR Review.Table Should Be Provided Listing Instrumentation & Vital Support Sys Equipment to Achieve & Maintain Hot &/Or Cold Shutdown.Response Requested by 810515

ML20126H538
Person / Time
Site:	Callaway
Issue date:	04/10/1981
From:	Tedesco R Office of Nuclear Reactor Regulation
To:	Bryan J UNION ELECTRIC CO.
References
NUDOCS 8104150047
Download: ML20126H538 (8)

Text

_ . _ .. -- _ _ _

• • p ** tov

• g'o UNITED STATES I

[

[ )

NUCLEAR REGULATORY COMMISSION ,

L E WASHINGTON. D. C. 20555

• ., n 1 g #

%, . . . . . /

APR 101981 d' ~

Docket No.: STN 50-483 $

Mr. John K. Bryan Vice President Union Electric Company g' g7[$

1901 Gratiot Street i P. O. Box 149 St. Louis, Missouri 63166

Subject:

Request for Additional Information for the Review of the .  :

Callaway Plant, Unit 1 .

As a result of our continuing review of the Callaway Plant, Unit 1 FSAR, we find that we need additional information to complete our evaluation. The specific information required is in the area of fire protection and is presented in the Enclosure.

To maintain our licensing review schedule for the Callaway Plant FSAR, we '

will need responses to the enclosed request by May 15, 1981. If you cannot meet this date, please inform us within seven days after receipt i of this letter of the date you plan to submit your responses so that we '

may review our schedule for any necessary changes.

Please contact Mr. Dromerick, Callaway Licensing Project Manager, if you desire any discussion or clarification of the enclosed request.

Sincerely, 2&w-Robert L. Tedesco, Assistant Director for Licensing Division of Licensing ..

Enclosure:

As stated cc: See next page 8 2 0415 OCA7 .

fir. J. K. Bryan l

. Vice President - Nuclear Union Electric Company P. O. Box 149

' St. Louis, Missouri 63166

~

cc: Mr. Nicholas A. Petrick Mr. William Hansen.  ;

Executive Director - SNUPPS Resident Insoector/Callaway NPS 5 Choke Cherry Road c/o US!!RC -

Rockville, Maryland 20B50 Steedman, Missouri 65077 Gerald Charnoff, Esq.

Shaw, Pittman, Potts &

Trowbridge 1800 M Street, N. W. '

Washington, D. C. 20036

. Mr. J. E. Birk Assistant to the General Counsel Union Electric Company ,

P. O. Box 149 l St. Louis, Missouri 63166 Dr. Vern Starks Route 1, Box 863 Ketchikan, Alaska 99901  :

Ms. TrevaHearn, Assistant General Counsel Missouri Public Service Commission '

P. O. Box 360- ,

Jefferson City, Missouri 65102 l Mr. D. F. Schnell Manager-Nuclear Engineering Union Electric Company P. O. Box 149 l

St. Louis, Missouri 63166 1.

m- '% m jee, : w e. . m >++m _

_e --.- . , _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . . _ _ _ _ _ _ . _ _ _ . _ . _

E![ CLOSURE _

1;ki PSD1[CTIOh SUPPL [ftpiTAL Quf 5710i1 i In accordance with section 9.5.1 Branch Ie'chnical Position ASS 9.5-1, position C.4.a.(1) of NRC Standard Review Plan and section III.G of new Appendix R to 10 CFR Part 50, it is the staff's position that cabling for redundant safe snutdown systems should be separated ,, by walls having a three-hour fire rating or equivalent protection (see section III.G.2 of Appendix R). That is, cabling required for or associated with the primary method of shutdown, should be .

physically separated by the equivalent o

a. three-hour rated fire barrier from ' '

cabling required for or associated with the redundant or alternate method of shutdown.

To assure that redundant shutdown cable systems and All,other cable systems that are associated with the shutdown cable systems are separated from each other so that both are not subject to damage from a single fire ha:ard, we require the following information for each system needed to bring the plant to a sa'fe shutdown. '

280.1C Provide a table that lists all equipment including instrumentation and vital -

support system equipment required to achieve and maintain hot and/or cold shutdown. For each equipment listed:

a.

Differentiate between equipment required to achieve and maintain hot ,

t shutdown and equipcent required to achieve and maintain cold shutdown.

. a ..

b. Define esch , equipment's location by fire area.

c. Define each equipment's # dundant counterpart.

O 4

O 6 o g g 1

( , , ,

d. Identify each equipment's essential cabling (instrumentation, control, and power). For each cab e identified: (1) Describe the ca ble routing (by fire area) from- source to tebination', and (2) Identify each fire area location where the cables are separated by less than a wall having a three-hour fire rating from cables for any redundant shutdown system, and

e. List any. problem areas identified by item 1.d.(2) above that will be corrected in accordance with Section III.G.3 of Appendix R (i.e., alternate or dedicated shutdown capability).

280.2 C Provide a table that lists Class 1E and Non-Class 1E cables that are associated with the essential sa fe shutdown systems identified in item i a bove. For each cable listed: (* See note on Page 3).

a. Define the cables' association to the safe ' shutdown system (ccrnon power source, con: mon raceway, separation less than IEEE Standard-384 guidelines, cables for equipment whose spurfoes operation ,

will adversely affect shutdown systems, etc.),

i

b. Describe each associated cable routing (by fire area) from source  !

to terminatfon, and ~*

1 l

c.

~

Identify each location where the associated cables are separated by less than a wall having a three-hour fire rating from cables .

required for or associated with any redundant shutdown system. .

)

- I I

1 l

.280.3C Provide one of the following for each of the circuits identified in item 2,. c a bove: ,

~

(a) The results of an analysis that demonstrates that failure caused

• '- by open, ground, or hot short of cables will not affect' it's .

associated shutdown system.

• Note *

(b) Identify each circuit requiring a solution in accordance with * - ... .'. ,..

.. ,._ . .. ..a.....

. ...~.. ..

section III.G.3 of, Appendix R, or _ ,

(c) Identify each circuit meeting or that will be modified to meet the requirements of section III.G.2 of AppOndix R (i.e., three-hour wall, -

20 feet of clear space with automatic fire suppression, or.one-hour barrier with automatic fire suppression).

280.4 C To assure compliance with GD019, we require the following information be provided for the control room. If credit is to be taken for an alternata  !

or dedicated shutdown method for other fire areas -(as identified by item 1.e or 3.b above) in accordance with section III.G'.3 'of new Appendix R to 10.CFR Part 50, the following information will also be required for each of these plant areas.

s

a. A table that lists all equipment including instrumentation and vital support system equipment that are required by the pricary method of achieving and maintaining, hot and/or cold shutdown. ...

. t

• NOTE Option 3a is considered te be one method of meeting the requirements of Section II.G.3 Appendix R. If option 3a is selected the information requested in items 2a and 2c above should be provided in general terms and the infor-mation requested by 2b need not be provided. .

, - , , - ,, . - . , , , , . . . , - . . , ,%. , . , ._,. . .._w.. . . , - . . . -

.y, ,,, , _ ._ g,,,,,,g , . ,,,...v3, ,, ,. y

{ .'.

- 4-1 b.

A table that lists all equipment ipgluding instrumentation and vital support system equipment that are required by th,e alternate, dedicated, or remote method of achieving and maintaining hot and/or cold shutdown.

i

c. Identify each alternat[ shutdown equipment listed in item. 4.b above with essential cables (instrumentation, control, and power) that are located in the fire area containthg ,the primary shutdown equipment. ..

Er each equipment listed crovide one of the following: ,

(1) Detailed electrical schematic crawings that show the essential cables that are duplicated elsewhere and-are electrically isolated from the subject fire areas, or .

i (2) The results of an analysis that demonstrates that failure (open, ground, or hot short) of each cable identified will -

not affect the capability to achieve and maintain hot or

~

cold shutdown.

d. Provide a table that lists Class 1E and Non-Class lE cables that are  !

associated with the alternate, dedicated,or remote method of shutdown.

,a -.

For each item listed, identify each associated cable located in the fire area containing the primary shutdown equipment. For each cable so ide6tified ,

provide the results of an analysis that demonstrates that failure (open, ground, or hot short) of the associated esble will not advepsely affect the alternate, dedicated.or remote method of shutdown.

0 4 q O O .

e

280.5 C The residual heat removal syst'e5 is s,enerally a low pressure system'that interfaces with the high pressure pridary. coolant system. To preclude a LOCA through this interface, we require complian'de with t,he recorcenda-tions of Branch Technical Position R5B 5-1. Thus, this interface most likely consists of two redundani.and independent motor operated valves with diverse interlocks in accordance with Branch Technical Position IC5'B 3. These two motor operated valves and their 4ssociated cable may be subject to a single fire hazard. It is our concerti that this single fire could cause the two valves to open resulting in a fire-initiated LOCA through the subject high-low pressure system interface. To assure that this interface and other high-low pressure interfaces are adequately protected from the effects of a single fire, we require the following information:

a. Identify each high-low pressure interface that uses redundant electrically controlled devices (such as t'wo series motor operated valves) to isolate or preclude rupture of any primary coolant boundary. .

b.

Identify each device's essential cabling (power and control) and describe the cable routing (by fire area) from source to

e termination. -'

~

J

c. Identify each location where the identified cables are separated  !

by.less than a wall having a three-hour fire rating from . cables for the redundant device. l

- e

.. .::: . . . . . . - . . _z. '

.- 1

. ' 6-  !

d. For the- areas identified in item 5.c above (if any), provide .the l t

bases and justification as to the' acceptability of the existing design or any prop: sed modifications. ..

a $

?

(

I e

O 9

, 9 0

t b

T e a j

O W

g e s

e t

9 2

?

e

• D

/ .

4 e

W O

e 9 e e

0 e

4 9

0 4 4

• e 4

e o

n-musn,- -

-re g w y wowy, .g--,-r--m., g..,y-e.. , ep s . 4-4-< p .e.,.my , -- n. .,. ,y +m,,. . -