ML19329C370
| ML19329C370 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 05/27/1975 |
| From: | Mazetis G Office of Nuclear Reactor Regulation |
| To: | Engle L Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8002130735 | |
| Download: ML19329C370 (2) | |
Text
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Leon Engle, Licensing Project itanager THRb: Robert Baer, Section A Leader, Reactor Systems Branch, TR DAVIS-BESSE 1 APPE!iDIX K ECCS SL"dMITTAL As was discussed with you earlier this week, the'following two items should be included in the applicant's Appendix K ECCS submittal:
1.
If Davis-Besse will operate with a part-pump reactor coolant system configuration, this capability must be supported by identifying and analyzing the worst break size and location (i.e., idle loop versus operating loop).
In addition, sufficient justification must be provided to conclude that the shape of the PCT versus 3reak Size curve would not be significantly altered by the partial loop configuration.
2.
It has recently come to our attention that after a LOCA, the operability of certain critical systems may be jeopardi:ed due to the location of certain related components (such as valve notors, busses, etc.) at or near the containment floor.
Post-LOCA flooding of the containment could submerge these components and could involve such essential safety features as the safety injection system, contalment isolation network, or systems needed to limit boric acid concentration in the reactor vessel during long-tem core cooling. The following information must be supplied:
a) Whethcr or not any components, such as valve motors or electric busses, will be submerged following a LOCA in Davis-Besse 1.
b)
If it is detemined that such components will be flooded; 1.
Identify this equipment.
2.
Evaluate the potential consequences of flooding of this equipment for both the thort tem and long tena (the long tem should include consideration of the potential
,[-f problem of excessive concentrations of boric acid.
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3.
Propose design changes to s419e the potential flooding w problen.
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