ML20148F271

Model STS 3.1.3.3 & 4.1.3.3 for Rod Drop Time

ML20148F271
Person / Time
Site:	Yankee Rowe
Issue date:	01/22/1975
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20148F270	List: ML20148F267 ML20148F271
References
NUDOCS 8011040737
Download: ML20148F271 (1)

Text

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l ROD DROP TIME LIMITING COND TION FOR OPERATION

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- 3.1.3.3 The individual shutdown and contr'ol. rod drop time shall be 1 . seconds from loss of stationary gripper coil voltage to dashpot entry with:

a. Tavg3'. 'F, and

! b. 'll A reactor coolant pumps operating.,

APPLICABILITY: MODE 3*

ACTION:

a. With the drop time of any rod determined to exceed the above.

limit, restore the rod drop tfee to within the above limit .

prior to proceeding to MODE 1 or 2.*

b '. With the rod drop times.within limits but determined with 3 reactor coolant pumps operating, operation may proceed provided THERMAL POWER is restricted to 1 75 percent of RATED THERMAL'

. POWER.

3:

SURVEILLANCE REQUIREMENTS 4.1.3.3 The rod drop time of full length rods shall be demonstrated through measurement prior to reactor criticality:

a. For all rods following each removal of the reactor vessel head,

b. For specifically affected individual rods following any main-tenance on or modification to the control rod drive system which could affect the drop time of those specific rods, and j c. At least once per 18 months. .

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• MODE 1: Power Operation MODE 2: Startup MODE 3: Hot Standby 8011040 7 3 7

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