ML053220456
| ML053220456 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 11/15/2005 |
| From: | - No Known Affiliation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2004-0307 | |
| Download: ML053220456 (2) | |
Text
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Pn In Vizirrfr II nit 9 -. I iiniz IA gnnfA I nrz nf (C~ffcifA Pnwimr IFvint _. It tna9A 9AfnA tRflnAAMA Event-Related Facts ssumptions Model Changes QuestionslNoteslSensitivity _
1 EDG "A" failed to srte ot recoverable due to circuitry failure in
- EPS-DGN-FS-DGA = True to calculate CCF 2 Charging pump 'E" failed Not recoverable due to air binding -
- CVC-MDP-FS-CHE = True to-stat C v_
operator have to bleed pump
- CVC-MDP-FR-CHE = True 3 Power restored to Unit 2 in Mission times for EDG and TDAFW pump
- EPS-DGN-FR-FTRM N. EDG FTR-medium basic 2 hrs 15 mins 2.5 hrs mission time = 2.0 event applies to the time
. AFW-TDP-FR-A mission range of 0.5 to 14 hrs time = 2.5 hrs 4 Offsite power available Recovery of power to first vital bus possible See below Q. Can power to vital bus be from Dever line shortly within one hour following a postulated SBO recovered within 60 min?
after event initiation Q. What are the steps/actions needed for recovery?
S. Do sensitivity analysis for offsite power recovery within 30 minutes for all three basic
.event below Recovery, of power during a postulated OEP-XHE-NOREC-ST = 0.1 S. Do sensitivity analysis for SBO and AFW failure:
offsite power recovery within
- Time available = time required (time to (10 x 5 x 2 x le-3 = 0.1) 30 minutes (P = 0.01 with
_r Time Available = nominal or
.*Stress
= extreme (core unoey 5
xi)
NV Eimminent if operator fails) t
\\,5&S F*
Comp exi y = mo erate (communications and coordination required outside control room)
- All other performance shaping factors are nominal 7.
5 :j -t-,
, f 4
T J.
5 RCP seals are the KSB SPAR uses the CE RCP seal LOCA model, None S. Do sensitivity analysis type where the licensee which is under review by NRC using conservative seal LOCA claims not to fail during model loss of seal cooling/injection (about 17 gpm leak) 6 No EDG recovery credited SPAR does not credit nominal EDG None S. Does not affect dominate recovery sequences Draft Preliminary Results -June 25, 2004 (9:49AM)
Run cases 5 %tile Mean&\\e:
95 %tile Unit 2:
- 2. Sensitivity Al: Offsite power recovery to first vital bus w-i 30 mi + extreme stress 1E-4
- 3. Sensitivity A2: Offsite power recovery to first vital bus w/i 30 min + high stress I E-4
+
r-4
- 6. Sensitivity C: Credit nominal AFW pump recovery (from NUREG/CR-5500, Vol 1) 2E-2
- 7. Sensitivity D: Offsite power recovery to first vital bus w/i 1 hr + high stress 2E-4 Unit 1: