ML20079Q878

Proposed Tech Specs 3/4.1.5, Standby Liquid Control Sys

ML20079Q878
Person / Time
Site:	Clinton
Issue date:	04/16/1992
From:	ILLINOIS POWER CO.
To:
Shared Package
ML20079Q875	List: JSP-206-92, Application for Amend to License NPF-62, Revising TS 3/4.1.5 Re Standby Liquid Control Sys ML20079Q878
References
NUDOCS 9204230291
Download: ML20079Q878 (5)

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Attachment 2 .

to U-601960 LS-91-009 REACTIVITY CONTROL SYSTEMS P8" 4 "I 9 -

BASES (y

3/4.1.4 CONTROL R00 PROGRAM CONTROLS (Continued)

The analysis of the rod drop accident is presented in Section 15.4 of the FSAR and the techniquec of the analysis are presented in a topical report, Reference 1, and two supplements, References 2 and 3.

The RPCS is also designed to automatically prevent fuel damage in the event of erroneous rod withdrawal from locations of high power density during higher power operation.

A dual channel system is provided that, above the low power setpoint, restricts .

. the withdrawal distanc'es of all non peripheral control rods. This restriction is greatest at highest power levels.

3/4.1.5 STANDBY LIQUID CONTROL SYSTEM The standby liquid control system provides a backup capability for bringing the reactor from full power to a cold, xenon-free shutdown, assuming that the with-drawn control rods remain fixed in the rated power pattern. To meet this objec-tive it is necessary to inject a quantity of sodium pentaborate solution which produces a concentration of 660 ppm in the reactor core and other piping systems connect'ed to the reactor vessel. To allow for potential leakage and imperfect ^

aixing this concentration is increased by 25% The required concentration is i achieved by having a minimum available quantity of 3574 gallons of sodium pen-taborate solution containing a minimum of 4246 lbs. of sodium pentaborate. Thi s quantity of solution is a not amount which is above theff =p cuctica, thuc Wl

lleuing fer the pertier 'Mch cr6ct be Sjected. The pumping rate of 41.2 gpm per pump provides a negative reactivity injection rate over the permissible pentaborate solution volume range, which adequately compensates for the positive reactivity effects due to temperature and xenon during shutdown. The tempera-ture requirement is necessary to ensure that the sodium pentaborate remains in solution, y g

%~~J With redundant pumps and explodve injection valves and with a highly reliable control rod scram system, opes stion of the reactor is permitted to continue for short periods of time with the system inoperable or for longer periods of time

. with one of the redundant components inoperable.

Surveillance requirements are established on a frequency that assures a high reliability of. the system. Once the solution is established, sodium pentaborate

1. C. J. Paone, R. C. Stirn and J. A. Woolley, " Rod Drop Acciden't Analysis

' for Large BWR's," G. E. Topical Report NE00-10527, March 1972

2. ~ C. J. Paone, R. =C. Stirn and R. M. Young, Supplement I to NED0-10527, July 1972

3. J. H. Haun, C. J. Paone and R. C. Stirn, Addendum 2, " Exposed Cores ,"

Supplement 2 to NE00-10527, January 1973 CLINTON - UNIT 1 B 3/4 1-4

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Page'8 of 9 l'NSERT 5'OR PACE B 3/4 1 4

- storage tank level instrtenent zero. (The instrument zero is based on ensuring j sufficient net positive suction head and includes additional margin to preclude  !

-' air entrainment in the pump suction piping due to vortexing during two pump

- operation;)

JESERT 2 FOR PAGE B 3/4 1-4 l The sodium pentaborate solution is required to be maintained within the boundaries _of Figure 3.1.5-1. The boundaries of this figure are based on system design limits. Maintaining the sodium pentaborate solution within the boundaries of Figure 3.1.5-1 ensures sufficient solution is available to bring the reactor to shutdown in accordance with the system design basis.

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. . REACTIVITY CONTROL SYSTEMS

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3/4.1.5 STANDBY LIQUID CONTROL SYSTEM (Continn d) concentration will not vary unless more sodium pentaborate or water is added, thus a check on the temperature and volume once each 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> assures that the solution is available for use.

Replacement of the explosive charges in the valves at regular intervals will assure that.these valves will not fail because of deterioration of the charges, t

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