ML20236B391
| ML20236B391 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 03/10/1989 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20236B393 | List: |
| References | |
| NUDOCS 8903210064 | |
| Download: ML20236B391 (2) | |
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TABLE 3.7-7 l
A_UXILIARY BUILDING GROUNDWATER LEVEL MONITORS i
I INTERIOR /
. LOCATION EXTERIOR ELEVATION UNIT (Feet - Mean Sea Level)-
1 PP51 Interior 731' - 0" 1
QQ56 Interior 731' - 0" 1&2 PP-61 Interior 731' - 0" 2
West Wall Exterior 731' - 0" 1
East' Wall Exterior 731' - 0" 2
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McGUIRE - UNITS 1 and 2 3/4 7-45 Amendment No. 93(Unit 1)
Amendment No. 74(Unit 2) 8903210064 890310 t
{DR ADOCK 05000369 PDC
k PLANT SYSTDt3 BASES 3/4.7/13 GROUNDWATER LEVEL This Technical Specification is provided to ensure. that groundwater levels will be monitored and prevented frori rising to the potential failure limit for i-the McGuire Units I and 2 Auxiliary Buildings. This notential failure limit is based on engineering calculations that have detemined that the Auxiliary Buildinas are susceptible to overturning due to buoyancy at elevation 737 feet MeanSealevel(PtSL). Under the requirements of this Technical Specification, if groundwater level exceeds elevation 731 feet MSL, (3 out of 5 Tech Spec groundwater monitor alams), and cannot be reduced in one (1) hour, !!cGuire must begin reducing Units 1 and 2 to finde 5 Cold Shutdown.
Analysis performed by Design Engineering detemined that the Reactor and i
Diesel Generator Buildings are designed to withstand hydrostatic loadings due to groundwater levels up to elevation 760 feet MSL; therefore, no Technical Specification requirements are specified for these structures.
Elevation 731 feet MSL is the Technical Specification action level of the five Technical Specification groundwater monitors listed in Table 3.7-7.
The East Wall exterior monitor alam at elevation 731 feet MSL is the Alert alam due to the groundwater well being bored to a depth of 730 feet MSL because of.
underground rock fomation below the well. The other four (4) monitors a're Hi-Hi alarus at elevation 731 feet (MSL).
The East Wall exterior monitor was originally on the exterior of the Unit 2 Auxiliary Building and subsequently was enclosed by the construction of the Equipment Staging Building.
As required by Operations procedures, any alarus on non-Technical Specifica-tion groundwater monitors will also be investigated. Additionally, if three (3) out of the five (5) Technical Specification Groundwater monitors alaru at levels below the Technical Specification action levels. Operations will con-tact Duke Design Engineering (Civil) for investigation and resolution of the increased groundwater level.
If one or more of the 5 Technical Specification groundwater monitors is deter-mined to be inocerable, the monitor (s) will be considered to be indicating above the 731'-0" level until repaired and returned to an operable status.
ficGUIRE - UNITS I and 2 B 3/4 7-8 Amendment No. 93 (Unit 1
, pendment No. 74 (Unit 2
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