ML063050380
| ML063050380 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 10/03/2006 |
| From: | Ford B Entergy Corp |
| To: | Williamson A Office of Nuclear Reactor Regulation |
| References | |
| %dam200612, TAC MD2296 | |
| Download: ML063050380 (5) | |
Text
Jý Alicia Williamson - Information from the Conference call on 9/26/06 Page i1 f~L~L4~
[
From:
"Ford, Bryan" <BFord@ ntergy.com>
To:
<arwl @ nrc.gov>
Date:
10/03/2006 10:44:21 A
Subject:
Information from the Conference call on 9/26/06 Please see the attached file that contains population dose risk (PDR) reduction in unit of % for each SAMA and for RAIs 5e, 5f, 5g, and 5h.
<<PDR reduction.doc>>
With 3 significant figures, the values for CDF, PDR, and OECR SAMAs 6 (equivalent to 18, and 20), 48, and 52 are as follows:
Original Submittal Re-analysis SAMA CDF PDR OECR CDF PDR 6,18,20 6.41 E-06 1.35E+01 1.46E+01 5.26E+04 48 6.41E-06 1.35E+01 4.59E 1.46E+01 5.26E+04 52 6.40E-06.
1.35E+01 4.59E 1.46E+01 5.26E+04 Base 6.41E-06 1.36E+01 4.59E 1.46E+01 5.26E+04 OECR 4.59E+04 6.41 E-06
-+04 6.41 E-06
~+04 6.40E-06 E+04 6.41 E-06 Small benefits could result from minor differences in CDF, PDF, or OECR.
For example, slight difference in PDR for SAMA 6 and Base results in a benefit of $2153 and an upper bound benefit of $12,915 with a multiplier of 6 in the original submittal. However, there is no such difference for the reanalysis. Therefore, the estimated benefit for SAMA 6 is $0.
Also, the Reduction in Off-site Economic Cost Risk (OECR) reduction for SAMA 27 on Table RAI.6-1should be 15.02% (same as RAI 5e) rather than 1.71%.
CC:
"Ellis, Douglas" <dellisl @entergy.com>, "Mogolesko, Fred" <fmogole@entergy.com>
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- Reduction in Population Dose Risk (PDR)
SAMA ID SAMA Description PDR Reduction 1
Install an independent method of suppression pool 4.79%
cooling.
2 Install a filtered containment vent to provide fission 18.49%
product scrubbing.
I3 Install a containment vent large enough to remove ATWS 1.37%
decay heat.
Create a large concrete crucible with heat removal 4
potential under the base mat to contain molten core 48.97%
debris.
5 Create a water-cooled rubble bed on the pedestal.
48.970/
6 Provide modification for flooding the drywell head.
0.00%
7 Enhance fire protection system and standby gas 1.37%
treatment system hardware and procedures.
8 Create a core melt source reduction system.
48.97%
9 Install a passive containment spray system.
4.79%
10 Strengthen primary and secondary containment.
26.03%
Increase the depth of the concrete basemat or use an 11 alternative concrete material to ensure melt-through does not occur 0.68%
12 Provide a reactor vessel exterior cooling system 0.00%
13 Construct a building to be connected to primary/
1.37%
secondary containment that is maintained at a vacuum 14 Dedicated Suppression Pool Cooling 4.79%
15 Create a larger volume in containment.
26.03%
16 Increase containment pressure capability (sufficient 26.03%
pressure to withstand severe accidents).
17 Install improved vacuum breakers (redundant valves in 0.00%
each line).
18 Increase the temperature margin for seals.
0.00%
19 Install a filtered vent 18.49%
20 Provide a method of drywell head flooding.
0.00%
21 Use alternate method of reactor building spray.
1.37%
22 Provide a means of flooding the rubble bed.
22.60%
Reduction in Population Dose Risk (PDR)
SAMA ID SAMA Description PDR (%)Ruction 23 Install a reactor cavity flooding system.
48.97%
24 Add ribbing to the containment shell.
26.03%
25 Provide additional DC battery capacity.
2.74%
26 Use fuel cells instead of lead-acid batteries.
2.74%
27 Modification for Improving DC Bus Reliability 16.44%
28 Provide 16-hour SBO injection.
2.74%
29 Provide an alternate pump power source.
5.48%
30 AC Bus Cross-Ties 8.22%
31 Add a dedicated DC power supply.
16.44%
32 Install additional batteries or divisions.
16.44%
33 Install fuel cells.
2.74%
34 DC Cross-Ties 2.05%
35 Extended SBO provisions.
2.74%
36 Locate RHR inside containment.
0.00%
37 Increase frequency of valve leak testing.
0.68%
38 Improve MSIV design.
0.00%
Install an independent diesel for the CST makeup pumps.
0.00%
Provide an additional high pressure injection pump with independent diesel.
2.05%
41 Install independent AC high pressure injection system.
2.05%
42 Install a passive high pressure system.
2.05%
43 Improved high pressure systems 1.37%
44 Install an additional active high pressure system.
2.05%
45 Add a diverse injection system.
2.05%
46 Increase SRV reseat reliability.
0.68%
47 Install an ATWS sized vent.
1.37%
Reduction in Population Dose Risk (PDR)
SAMA ID SAMA Description PDR Reduction 48 Diversify explosive valve operation.
0.00%
Increase the reliability of SRVs by adding signals to open them automatically.
0.68%
50 Improve SRV design.
3.42%
51 Provide self-cooled ECCS pump seals.
0.68%
52 Provide digital large break LOCA protection.
0.00%
Control containment venting within a narrow band of pressure 4.79%
Install a bypass switch to bypass the low reactor 54 pressure interlocks of LPCI or core spray injection valves.
0.68%
55 Improve SSW System and RBCCW pump recovery.
6.85%
56 Provide redundant DC power supplies to DTV valves.
3.42%
Proceduralize the use of diesel fire pump hydroturbine in the event of EDG A failure or unavailability.
3.42%
58 Proceduralize the operator action to feed B1 loads via B3 when A5 is unavailable post-trip.
3.42%
Provide redundant path from.fire protection pump discharge to LPCI loops A and B cross-tie.
17.12%
RAI 5e Equivalent to SAMA 27 16.44%
RAI 5f Firewater injection 4.11%
RAI 5g Reduntant diesel firewater pump 8.22%
RAI 5h Passive direct torus vent 14.38%