ML20235S498
| ML20235S498 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 07/15/1987 |
| From: | Bailey J GEORGIA POWER CO., SOUTHERN COMPANY SERVICES, INC. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| GN-1384, NUDOCS 8707210675 | |
| Download: ML20235S498 (4) | |
Text
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. Georgie Pow::s Company.-
Post Offica Box 282 Wayrusboro, Georgia 30850 -
Tel:phorts 404 554 9%1 '
404 724 8114 Southern Company Services, Inc.
Post Office Box 2625 Birmingham, A!abama 3E202 reiepnene 205 87 ""
Vogtle Project
. July 15, 1987 U. S. Nuclear Regulatory Commission File:
X7BC35 Document Control Desk Log:
GN-1384 Washington, D.-C.
20555 NRC DOCKET NUMBER 50-425 CONSTRUCTION PERMIT NUMBER CPPR-109 V0GTLE ELECTRIC GENERATING PLANT - UNIT 2 RADIOLOGICAL CONSEQUENCES OF ELECTRICAL PENETRATION FILTIER AND EXHAUST SYSTEM DELETION
Reference:
Letter GN-1374 dated June 1,1987,
Subject:
Electrical Penetration Filter and Exhaust System Gentlemen:
In the referenced letter we requested your comments to a proposed revision to the design bases. of the. Control Building HVAC system elimination of the electrical penetration. filter and exhaust system.
1 In response to verbal questions from you regarding this subject the following discussion is provided.
Concern:
How will deletion of the electrical penetration filter and exhaust system affect other portions of the control building, with and without the normal HVAC system that serves the electrical penetration area in operation?
Response: The control building level A and B normal HVAC systems have no connections to either the Control Room or Technical Support Center (TSC) HVAC systems or rooms.
While the control building level A and B - rooms would be contaminated by operation of the normal HVAC system (with or without the electrical penetration filter and exhe.ust ~ system), the Control Room and TSC are pressurized during an accident. to minimize in-leakage.
Thus the primary source of contamination to the Control Room and TSC would be via the emergency outside air intakes.
If the control building normal HVAC systems are not operating, the level A and B rooms outside the. electrical penetration filter and exhaust system boundary would not be expected to be contaminated.
8707210675 870715--y PDR ADOCK 0500/4 5 O
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Radiological Consequences of Electrical Penetration Filter and Exhaust System Deletion File:
X7BC35 Log: GN-1384 July 15, 1987 Page two A calculation was performed to compare the contribution of the electrical penetration leakage to the other containment leakage for activity entry into the control building level A and B areas.
Table 1 presents the parameters which were used in this calculation.
The methodology which was used is described below.
The containment leakage is diluted in the atmosphere prior to being taken into the control building level A and B HVAC intake.
The containment leakage is multiplied by the atmospheric dispersion factors and then by the normal HVAC intake flow rate to yield a
" diluted containment leakage" source term to be compared to the direct electrical penetration leakage.
Two 1
direct electrical penetration leakage cases were considered, (1) allowed IEEE 317-76 (design) leakage rate per penetration and (2) Type 3 test results for the electrical penetrations.
The results of the calculation show:
1.
If the design leakage specified in the electrical penetration purchase specification was assumed for all electrical penetrations, the electrical penetration area activity would be 11% of the total activity seen in level A and B of the control building when compared to the total allowed Technical Specification leakage seen in those areas at the end of 30 days.
2.
If the activity resulting from leakage obtained during the Type B tests were compared to the activity resulting from the total allowed Technical Specification leakage (75% of the value used in the FSAR accident analyses),
the activity from the electrical penetrations would represent 7%
of the total activity seen in the control building levels A and B at the end of 30 days.
l The electrical penetration filter and exhaust system should be deleted because:
1 The results of this calculation indicated that electrical penetration leakage cont"ibutes a small fraction of control building lefel A
and B
post-accident activity if the normal systems are operating.
Radiological Consequences of Electrical Penetration Filter and Exhause System Deletion File:
X7BC35 Log:
GN-1384 July 15,1987 Page three If the control building normal HVAC systems are not operating, the level A and B rooms outside the electrical penetration filter and exhaust system boundary would not be expected to be contaminated.
Deletion of the electrical penetration filter and exhaust system does not directly affect vital areas of the control building.
The electrical penetration leakage contribution to the off-site dose is a very small fraction of the Technical Specification limits which were used in the FSAR accident analysis.
If you have any further questions r.egarding this proposal we would be please to meet with you at your convenience.
Sincerely, J. A. Bailey Project Licensing Manager JAB /wkl Attachments xc: NRC Regional Administrator NRC Resident Inspector J. P. O'Reilly R. E. Conway L. T. Gucua R. A. Thomas M. A. Miller (2) quire J. E. Joiner, Es G. Bockhold, Jr.
R. Goddard, Esquire D. Feig R. W. McManus Vogtle Project File I
L.. s l:
TABLE 1 PARAMETERS USED IN EVALUATING THE RADIOLOGICAL CONSEQUENCES OF
' ELECTRICAL PENETRATION FILTER AND EXHAUST SYSTEM DELETION
-CONTAINMENT LEAKAGE 0-24 HOURS (WEIGHT %/ DAY) 0.15,
1-30L DAYS (WEIGHT %/ DAY) 0.075--
ELECTRICAL PENETRATION LEAKAGE MAXIMUM LEAKAGE (CC/ MIN / PENETRATION) 0.6 NUMBER OF ELECTRICAL PENETRATIONS 72 TESTED TOTAL LEAKAGE-(CC/ MIN) 27 6
CONTAINMENT VOLUME (FT )
2.75 X 10 CONTROL BUILDING LEVEL A AND B NORMAL HVAC INTAKE FLOWRATE (CFM) 2200 ATMOSPHERIC DISPERSION FACTORS ** (S/M )
-3' 0-8 HOUR 5.7 X 10 -3 8-24 HOUR 3.8 X 10~
24-96 HOUR 2.3 X 10-3 96-720 HOUR 1.1 X'10 0.to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> represents 75% of the Technical Specification limit (L,)
I to 30 days represents one-half of the 0 to 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> value.
- The contol room atmospheric dispersion factors presented in FSAR table 15.A-2 are assumed to be applicable to the control building level A and B-normal HVAC intake. The control building level A and B normal HVAC intake is located closer to the containment than the control room intake. The control room atmospheric dispersion factors are smaller than would be expected for the normal HVAC intake which minimizes the containment leakage contritation to the level A and B control building activity, thereby maximizing the potential impact of the electrical penetration
' filter and exhaust system deletion.
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