ML20155A306
| ML20155A306 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 05/27/1988 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML20155A303 | List: |
| References | |
| NUDOCS 8806100013 | |
| Download: ML20155A306 (4) | |
Text
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Proposed Technical Specification Changes C806100013 880527 PDR ADOCK 05000413 P
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, 7 {,
TABLC 3.3-10 9
ACCIDENT MON 110 RING INSTRUMENTATION Y
TOTAL MINIMUM NO. OF CHANNELS CHANNELS OPERABLE.
E INSTRUMENT W
2 1
1.
Containment Pressure
]
2 1
2.
Reactor Coolant Outlet Temperature - TMT (Wide Range) 2 1
3.
Reactor Coolant inlet Temperature - TCOLD (Wide Range) 2 1
4.
Reactor Coolant Pressure - Wide Range 2
~
l S.
Pressurizer Water Level 2/ steam generator 1/ steam generator 6.
Steam Line Pressure w1 2/ steam generator 1/ steam generator 7.
Steam Generator Water Level - Narrow Range w
d.
2 1
8.
Refueling Water Storage Tank Water Level 2/ steam generator 1/ steam generator 9.
Auxiliary Feedwater Flow Rate 1
1 10.
Reactor Coolant System Subcooling Margin Monitor 2/ Valve 1/ Valve 11.
PGRV Position Indicator *
~2/Vahe 4/Vah 12.
PORV Block Valve Position Indicator **
1/ Valve 1/ Valve
[5 Pressurizer Safety Valve Position Indicator 13.
I 2
1 14.
Containment Sump Water Level (Wide Range)
- a. 06+ 1 Z
IV e I
l/d v e.
6' UJf 2.
Ij'traIve Ij' v'a-(ve
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l
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Discussion and No Significant Hazards Analysis
s.
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DISCUSSION AND NO SIGNIFICANT RAZARDS ANALYSIS The proposed amendment would change the Total Number of Channels for the PORV Block Valve Position Indicator from 2/ Valve to 1/ Valve.
Each of the three Catawba Pressurizer Power Operated Relief Valves (PORVs) has an associated motor operated block valve. These motor operated block valves are safety related.
In accordance with NUREG-0737 Item II.G.1, they are capable of being supplied from either the offsite power source or the emergency power source when offsite power is not available. One channel of safety related position indication is provided for each block valve by means of control room indicating lights associated with the valve control switch. This position indication is not redundant for each valve, but is seismically and environmentally qualified and meets all applicable design and regulatory requirements. A second non-safety indication channel was provided in the design for maintenance and test purposes but was not needed nor intended as accident monitoring instrumentation. Hence, this second channel should be deleted from the Technical Specifications.
10 CFR 50.92 states that a proposed amendment involves no significant hazards considerations if operation in accordance with the proposed amondment would nots (1) Involve a significant increase in the probability oc consequences of an accident previously evaluated; or (2) Create the possibility of a new or different kind of accident from any accident previously evaluated; or (3) Involve a significant reduction in a margin of safety.
The proposed amendment does not involve On increase in the probability or consequences of any previously evaluated accident.
The second channel of PORV Block Valve Position Indication was not taken credit for in the design of the system or in any accident analysis. This second channel is non-safety related and is not relied upon during any accident scenario. Therefore, changing the requirements from 2 indicators per valve to 1 per valve will have no effect on any of +.he accidents previously analyzed.
The proposed amendment does not create the possibility of a new or different kind of accident from any accident previously evaluated. The design and allowed modes of operation of the station will not be affected by changing the total number of PORV Block Valve Position Indicators required by the Technical Specifications.
i The second channel of position indication is non-safety related and is not relied i
j upon in any of the accident analyses.
As such, no new kinds of accidents will be j
made possible.
j The proposed amendment does not involve a significant reduction in a margin of safety. The second channel of PORV Block Valve Position Indication is non-safety 5
related and is not assumed in any accident analysir. Therefore, changing the requirements for the indicators will not significantly effect any margin of l
- safety, j
For the above reasons, Duka Power concludes that this proposed amendment does not involve any Significant Hazards Considerations.
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