ML19256D670
| ML19256D670 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/07/1976 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | Goller K Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910220585 | |
| Download: ML19256D670 (2) | |
Text
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MEMCRANDUM FOR:
K. Goller, Assistant Director, Operating Reactors 00R FROM:
D. Eisenhut, Assistant Director, Operational Techr. ology D0R
SUBJECT:
PREMATURE EMPTYING.0F SODIUM HYDR 0XIDE AND SODIUM THIOSULFATE FANKS.
REFERENCE:
TAR No. ORB-4-73 Three. Mile Island - Unit 1 (50-289)
I The Reactor Safety Branch has reviewed the. subject matter to determine the effect of premature emptying of the Sodium Hydroxide and Sodium Thiosulfate tanks on ECCS performance...In the. event that these tanks would empty prematurely (while the Residual Heat Removal (RHR) and Reactor Building Spray (RBS). pumps are.still. drawing borated water L
from the RWST) air could be drawn through.the empty tanks thereby
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compromising the ECCS perfonnar)ce.......,...
The purpose of Sodium Hydroxide.and Sodium Thiosulfate tanks is to inject the additives needed for maintaining pH and for helping to remove iodine from the reactor. containment during.a post accident condition. The tant s are connected to the pipeline between the suction side of the RHR and RBS.purnps and the RWST. They inject the additives into the borated. water drawn from the Rh"5T.
l Recent analysis, performed by' Babcock and Wilcox, indicated that, under certain circumstances,.the content.of the additiva tanks can be depleted before the suction of the.RHR and RBS purnps is switched to the containment sump.
In this case, pure borated water will be introduced into the RBS and ECC. systems and air will be drawn through the empty tanks, if negative heads exist at the injection poinM in the main pipeline.
The staff has perfomed an analysis of the problem and found that, for the maximum possible flow rates (assuming runout of both RHR and RBS pumps) pressure heads at all injection p61nts remain positive.
Contact:
KParczewski, DOR X28050 y,y,y ms.. m o w -
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K. Goller
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This indiestes that, for all the anticipated operating conditiens of the ECL system, the performance.of.the.RHR and RBS. pumps will not be afLcted by the premature emptying of the Sodium Hydroxide and the Sodium Thiosulfate tanks.and.tbe. performance of.the ECC system will remain unchanged...
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Darrell G. Eisenhut Assistanti Director
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.. Division of Operating Reactors.
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V. Stello R. Baer C. Berlinger F. Coffman S. Weiss R. Reid
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