ML19326A415

NRC Guidelines for Excluding Exercising (Cycling) Tests of Certain Valves During Plant Operation

ML19326A415
Person / Time
Site:	Davis Besse
Issue date:	04/22/1977
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML19326A406	List: ML19326A405 ML19326A409 ML19326A415
References
TAC-10985, NUDOCS 8002030216
Download: ML19326A415 (1)

Text

=

C'7 m

q.

~

~

1:RC STAFF GUIDELINES FOR EXCLU0!?lG EXERCISI4

^(CYCLING) TESTS OF CERI Alti YALVES.*

~~

~

DURitia PLANT OPERAi101 i

Any valve which when exercised (cycled) could put the plant in Below are some exanples of the types of valves that shou:

be sp.ecifically excluded from exercising (cycling) tests during p should not be tested.

All valves whose failure in a non-conservative position during the c e

f f< '

Yalves test would cause a loss of system function should not be exercised.

1.

• in this category would typically include all non-redundant valves in such as a single discharge line frcm the refueli f

$.f Other valves may fall into this and the HPCI pump discharge in BWR's.

For y

category under certain system configurations or plant operating mode example, when one train of a redundant system I

'i,

T*

./.

• failure would cause a loss of total system function.

All valves, whose failure to close during a cycling test would result in Yalves in this category would typically 2.

-p loss of containment integrity. include all vcives in containment p s

.3 is open and inoperable.

C-All valves, which when cycled,'could subjest a system to 3.

that one or more of the upstream check valves has f ailed unless pos of their design pressures.

.h methods are available for detennining the pressure or lack thereof on u

Yalves in this cate; cry high pressure side of the valve to be cyclec.

would typically include the isolation valves of the residual heat ren shutdown cooling system and, in some cases certain ECCS valves.

~,5 y

/ '.

i

-O

• All ASi1E Section XI Category A and B valves should be cycled, as l

at each cold shutdown, but need not be cycled more of ten than or.c S'

l l

months.

D ""D)

Y D T eCM e J 2.1 La 1

.t 4-e e

-w

• e= %. _ _ _

==e-.

8 0 02 0 s op.16