ML051050134
| ML051050134 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 06/29/2004 |
| From: | Louden P NRC/RGN-III |
| To: | Chernoff H Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2004-0282 | |
| Download: ML051050134 (5) | |
Text
IHarold Chernoff - Fwd: PB AFW Recirc AOV CAP From:
Patrick Louden (L To:
Harold Chernoff Uplo Date:
Tue, Jun 29, 2004 9:13 AM
Subject:
Fwd: PB AFW Recirc AOV CAP Page 1 q
I Harold Chernoff - PB AFW Recirc AOV CAP Paqe 1 I From:
To:
Date:
Subject:
CC:
"PGK1 @NRC.GOV" <pgkl @nrc.gov>
"PLL@ NRC.GOV" <p1l @nrc.gov>, mjlc@ nrc.gov" <jic @ nrc.gov>
Mon, Jun 28, 2004 4:32 PM PB AFW Recirc AOV CAP MAK3@NRC.GOV" <mak3@nrc.gov>
E: State Change History Initiate 0
by CHAPMAN. ROB AR Pre-Screen 6/28/2004 14:23:24 Owner (None)
E Section I Activity Request Id:
Activity Type:
CAP057635 CAP Submit Date:
6/28/2004 14:23:24
, One Line
Description:
AFW Recirculation AOVs 'n6t 'st udo in'6'onfo~rnce& With Calculations i) Detailed
Description:
612812004 14:23:24 - CHAPMAN, ROB:
During preparation of Revision 1 to Calculation 2002-0002 for the nitrogen backup system for the Motor-Driven AFW pump AOVs, It was discovered that the AFW recirculation AOVs are not set up in conformance With the calculation. This also applies to the AOVs for the Turbine-Driven AFW pump (and calculation 2001-0056). Both calculations require the AOVs to be set up such that there is a V/4 gap between the actuator frame and the diaphragm housing when in the shut position. This serves to minimize the dead volume of the actuator. This dead volume Is a'n Input to the calculations, and the value used for this actuator (Copes Vulcan D-100-160) dead volume plus stroke volume of 291 cubic inches is contingent on the valve being set up in this manner.
A walkdown confirmed the following dimensions:
1AF-4002 1.718" AF-40071 18"'
AF-4014 7/8" 2AF-4002 1 1/4" The calculations contain a large amount of margin In that very conservative leakage is assumed, as well as conservatively large number of valve strokes. A review of the effects on the calculations (current revisions on record) using 'the worst case stroke volume (dead volume plus stroke volume) of 600 cubic indhes'follows:
Calculation 2001-0056 Rev 2 (TDAFP): If the worst case value of 600 cubic inches is used, it results in a required tank volume of approximately 211 gallons (the '112T-212 tanks are actually 150 gallons). 'If a realistic value of leakage is used (from recent performance of IT 8C), the required tank volume is 154 gallons.- The net result of this condition is that less than 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of backup air may be available, If the recirculation valves are stroked 10 times per hour.
Calculation 2002-0002 Rev 0 (MDAFP): If the worst case value of 600 cubic inches is used, it results in a bottle changeout pressure of approximately 1927 psig to ensure a minimum of 90 minutes of operation.- Note that this review has also considered CAP057630 was issued earlier that has resulted in a required increase'in the changeout pressdreto 1950 osig.
Initiator:
CHAPMAN, ROB EU Initiator Department:
DateMme of Discovery: 6/28/2004 14:19:00 DateMme of Occurrence:
Identified By:
Equipment# (I 1st):
Equipment # (2nd):
Equipment # (3rd):
Site/Unit:
Why did this occur?:
-Site-Identified (None)
(None)
(None)
System:
Equipment Name (1st):
Equipment Name (2nd):
Equipment Name (3rd):
EXD Engineening Safety 8 Design Review PB 6128/2004 14:19:00 AF PB (None)
(None)
(None)
Point Beach -
Cornmon 6128/2004 14:23:24 - CHAPMAN, ROB:
Requirements from calculations were not transferred to the field for setup of the AOVs.
Immediate Action Taken: 6/2812004 14:23:24 - CHAPMAN, ROB:
Reviewed calculations for the effects of this condition.
Recommendations:
6/28/2004 14:23:24 - CHAPMAN,'ROB:
http://enwsO2/tmtrack/lmtrack.dll?lssuePage&Tcmplate=viewvbody&rccordid=726888&ta...
6/2S/2004
The recirculaiton AOVs should be set up such that the gap between the actuator frame and the diaphragm housing is less than 1/4". This will bring the actuators into conformance with the calculations.
' SRO Review Required?: Y E Section 2 Operability Status:
(None) 0 Compensatory Actions: N Basis for Operability:
- Unplanned TSAC Entry: N
@ External Notification:
N 8 Section 3 Screened?:
N I Significance Level: (None)
N Potential MRFF?:
N 0 QA/Nuclear Oversight?: N 0 LUcensing Review?: N Good Catch/Weil Doc'd?: NA 8 Section 4 Inappropriate Action:
Process:
- (None)
Activity:
(None)
Human Error Type:
(None)
Human Perf Fail Mode: (None)
Equip Failure Mode:
(None)
Process Fall Mode:
(None)
OrgfMgt Failure Mode: (None) 6 Group Causing Prob: (None)
Hot Buttons:
(None)
Iittp://cnws02/tmtrack/tmtrack.dll?lssitePage&Tcmplate=vicwbody&recordid=726888&ta...
6/28/2004
I CALC 2001-0056 Rev 02 RCC IO4I42003 Page 10 of 13 Using the difference in SCFA volumes in the tank as equal to the total required demand:
Vsr,- VSTf= VSCFA = 35.4 SCFA (6.1.9)
Inserting Eq 6.1.9 into Eq 6.1.7 and 6.1.8 and solving yiclds:
VTANK= 0.142(35.4 + Vs-r) = 0.195 Vs7
- 0. 142(35.4)
=48sF VS=f =(19(
1)2--9-4.8' SCFA Vs,-(0. 195 -0.142)
Vs,= 35A + 94.8 = 130.2'.SCFA VTANK= 0.195(94.8) = 18.5f' *(748 galfi3)= 138 gal 6.2 Calculation of Modification PMT Acceptance Criteria V, = 291 in3
,d,= 0.245 in L, = 1000 in t = 5 minutes Swept volume of diaphragm including dead band (Input 5.2)
Tubing diameter (Input 5.9, Section 6.1)
Maximum length of tubing pressurized (Input 5.9)
Test duration (Input 5.10)
Calculation of filled volume of tubing and valve:
V =-X d,2Lt = Z (.245tin])2(1000[in]) = 47.1[in3 ]
4:T 4
(62.1)
VT-FST= Vt+ VP = 47.1 +-291 =.338 in3 VTES= 338 in3 *(1 ft'/1728 in)-- 0.196 ft3 Pressure dron in system during testinz-The pressure drop can be calculated for standard conditions assuming any value of leakage in SCFM. The equation for the change in standard volume of air is:
Vi1.
=(1-V,)
t (622) where Vi and VWare the initial and final volumes of air in the pressurized section of tubing in SCFA. Using Equations 6.1.5 and 6.1.6, the pressures and volume have the following relationship: