ML20211E324
| ML20211E324 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 06/10/1986 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20211E329 | List: |
| References | |
| NUDOCS 8606130318 | |
| Download: ML20211E324 (1) | |
Text
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i EMERGENCY CORE COOLING SYSTEMS.
g..
BASES J.'
I ACCUMULATORS (Continued) 2.
Reduce the nominal water level in the Cold Leg Accumulators and modify instrumentation, alarm functions, and procedures accordingly.
i 3.
Increase the nominal gas cover pressure in the Cold Leg Accumulators and modify instrumentation, alarm functions, and procedures accordingly.
4.
Ensure UHI isolation' valves remain closed during operation.
Items 1, 2, 3 constitute modifications required by the phrase " Cold Leg Accumulator and discharge paths suitably modified" contained in the technical specifications.
Item 4 is a requirement that will be implemented by adminis-trative controls and is reflected in Technical Specification 3/4 5.1.4.
Specification 3/4.5.1.2 on page 3/4 5-2a, -2b is the Technical Specifica-tion requirements for the Cold Leg Injection with UHI system operable. As this is expected to be an interim condition, the pages have been renumbered with.
I suffixes a, b.
With respect to Technical Specifications for the UHI system,
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page 3/4 5-3 is provided as the planned final condition of the plant, that being with the UHI system deleted. New page 3/4 5-4 is provided to cover the condition following modification of the cold leg accursulators and discharge paths. This new requirement is that the isolation valves be closed and remain closed. Surveillance once per shift (12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />) is provided. New page. 3/4 5-3a duplicates the present Technical Specification for operability of the UHI sys-tem and is now Specification 3.5.1.3.
As this is expected to be an interim condition the page has been renumbered to 3/4 5-3a.
Page 3/4 5-3b provides the continuation of the surveillance requirements of Specification 4.5.1.2 when UHI system operability is required.
3/4.5.2 and 3/4.5.3 ECCS SUBSYSTEMS
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The OPERABILITY of two independent ECCS subsystems ensures that sufficient emergency core cooling capability will be available in the event of a LOCA assuming the loss of one subsystem through any single failure consideration.
Either subsystem operating in conjunction with the accumulators is capable of supplying sufficient core cooling to limit the peak cladding temperatures within acceptable limits for all postulated break sizes ranging from the double ended break of the largest RCS cold leg pipe downward.
In addition, i
each ECCS subsystem provides long-term core cooling capability in the recirculation mode during the accident recovery period.
I With the RCS temperature below 350'F, one OPERABLE ECCS subsystem is acceptable without single failure consideration on the basis of the stable reactivity condition of the reactor and the limited core cooling. requirements.
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McGUIRE - UNITS 1 and 2 B 3/4 5-2 Amendment No.57 (Unit 1)
Amendment No.38 (Unit 2) j 8606130318 860610 PDR ADOCK 05000369 l
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