ML20073R734

Proposed Changes to Tech Specs Revising Stated Isolation Logic for Group 7 Isolation Valves to Reflect Actual Logic

ML20073R734
Person / Time
Site:	Browns Ferry
Issue date:	04/28/1983
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20073R724	List: ML20073R722 ML20073R734
References
NUDOCS 8305040517
Download: ML20073R734 (5)

Text

._. _ = . . _ . . ~ . . __ -_ .. . - _ - . . - . .. . . _ . ._.

t ENCLOSURE 1 PROPOSED TECHNICAL SPECIFICATION CHANGES BROWNS FERRY NUCLEAR PLANT UNITS 1, 2, AND 3 l

(TVA BFNP TS 176 SUPPLEMENT 5 I

i. /

I 4

2 1

0 I

l l

i l

l l

I f

l

. 8305040517 830428 PDR ADOCK 05000259 P PDR

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

1 I

i UNIT 1 ,

i.

Croup 7: The valves in Group 7 are automatically actuated by only tha (ellowins condition:

l 1. The respective turbine steam supply valve not fully closed.

croup 8: The valves in Croup 9 are automatically actu.ated by only the f allowins cendLtion:

j 2. High Uryvell pressure l.

WP G'

i f

i

~

I j .

t i +

S I,

I

[

f 255 i

5-1 l -8 t

> = . *

..o . (

-- '- ......e... .a c , . ,, _ . . , , . , , , , . . , ,, ,. _ ~ ** u.n.

, ,..-.__~,m_..._.._, . . . _ _ - , . . _ _ _ _ _ . . . _ _ . _ _ _ . _ _ _ _ _ . _ , . _ . , . _ .... _.. _ _ ,.,_ ,._. _ _ ____ ~ . ._,._.._ __ _ _ _ _

UNIT 2

.g

, s Group 7: The valves in Croup 7 are autou tically actuated by only the following condition:

r

1. The respective turbine steam supply valve not fully closed.

Croup B: The valves in Creup 6 ars auto:satically actu.sted by only the folleving condition:

2. High Dryvell pressure a

t i

I 0

255

)

l l

l

.....n .. ..

l . . ._

r

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

. 3 UNIT 3 -

l t

only the following condition: "

t

1. The respective turbine s' team supply valve not fully closed.

Tha. valves in Group 8 are automatically actuated by Group 8:

only the following condition:

i ,

1. High Drywell Pressure i

l e

1 9

I M

Q l

I L

i

{

I

( .

(1 267 6

l .

• ' * . . . ,....s.. . . - .

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

ENCLOSURE 2 EXPLANATION AND JUSTIFICATION TVA BFNP TS 176 SUPPLEMENT 5 The group 7 isolation valves consist of the HPCI and RCIC steamline drain valves and condensate pump drain valves. They receive their isolation logic from the limit switch of their respective steam supply. valve. When the steam supply valve begins to open, it initiates closure of the respective isolation valves. This revision to the technical specifications is being made to actually state that logic.

The technical specification originally stated that the group 7 valves go closed on a low water level signal at 470 inches. 'The low water level signal initiates opening of the steam supply valve which in turn closes the isolation valves as described above. Wnile the isolation signal in the technical specification is not totally descriptive, it is not incorrect. The proposed revision is being made to make the technical specification reflect-the actual isolation logic. Figures 7.4 - 2C and 4.7 - 2C of the FSAR show the described logic for the HPCI and RCIC systems respectively.

Since this proposed revision is being made to clarify the actual logic for the group 7 valves, it in no way alters the overall safety of the plant.

l I

I t

l l

l i

. . -- -. --.