ML20005A761
| ML20005A761 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 06/01/1981 |
| From: | Mazur D WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Faulkenberry B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, GO-1-81-164, NUDOCS 8107010195 | |
| Download: ML20005A761 (5) | |
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Washington Public Power Supply System A JOINT OPERATING AGENCY P O. 80s See 3000 Gao. w
- snesseroM Waf RfCo.LANo. We Se.844Fome 99 3 52 Puona (30s) 375 5000 Nuclear Regulatory Commission June 1, 1981 Region V G0-1-81-164
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-Suite 202 Walnut Creek Plaza 35.7 pp 1990 H. California Boulevard g
Walnut Creek, California 94596
] Juu Attention:
fir. B. H. Faulkenberry I
Chief, Reactor Construction O
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Projects Branch
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Subject:
PROJECTS 1 A!!D 4 DOCKET HOS. 50-460 AND 50-513 s )
REPORTABLE CONDITION 10CFR50.55(e) f.'"
i((I C0f1P,USTION AIR INTAKE DESIGN DEFICIENCY qp..
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Telecon TJ Houchins, SS to DF Kirsch, b
juN 30 N Q'6, !
Region V Nuclear Regulatory Commission [c y, g,[ / g.
Reference:
1) f.
December 8, 1981
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- 2) G01-81-02, dateo January 6, 1981 U>
D D. W. Mazur to R. H. Engelken, Y'
Director
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In reference 1) the Supply System informed ycur office of reportable deficiency under 10CFR50.55(e) and refer qce 2) was art interim report on the subject condition.
Attachment A includes a brief description as to how the deficiency was discovered, and the proposed action to be taken te correct the subject design deficiency. The design changes, as presented herein, have been approved by Project Engineering; however, the design has not received final Project fianagement approval. At such time as approval is received the design will be implemented and a final report will be transmitted to the Region V office under a separate cover.
If any changes to this design are incurred between now and the time of final approval, you will be so notified.
Final approval should be received no later than August 1,1981; therefore, we are submitting this as an interim report.
If you have any questions or desire further information, please advise.
)ary t y yours, D. W. f4 z Program Director WNP-1/a Attachment DWM:MER:pm g
cc: CR Bryant, Bonneville Power Administration /399 81070/0\\%
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-ATTACHMENT 1 A DESIGN ACTIONS
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The following design changes were evaluated.
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Proposal To ensure that the starting of the Diesel Generator (DG), under a tornado condition, would not affect the integrity of the ventilation of other systeas, it was proposed that the DG Combe-tion Air Intakes and HVAC system inta m be separated. Separation of the air intakes from the intake for the HVAC system in the DG area, and placing the DG com.
bustion air intakes ahead of the tornado check valves would ensure safe operation of.both systems under tornado conditions.
Final Action Proposal was implemented as described. See Attachment II.
2.
Prooosal Design the Combustion Air Intake Ducts to withstand the negative 1.5 psi, under a tordano condition.
Final Action Proposal was implemented as described. achedule 30 piping replaced the ducting previously used.
3.
Proposal Replace the existing louvers with a type which would substa'ntially reduce rain and snow carry-over into the intake area, and eva'luate the need to provide heat tracing for louvers to prevent ice or snow buildups.
Final Action Very iow water penetration type AMCA certified louvers will be procured and installed. Heat tracing will not be required on this type of louver to withstand the environmental conditions in the area.
DISCOVERY OF THE REPORTABLE CONDITION In the original design, as reported in the PSAR, the DG draws combustion air from the Emergency DG Accessories Area, where the machine is located.
The room is sarved by the DG HVAC system which has two (2) modes of operation:
" Normal" and " Diesel On."
In the " Normal" mode, u,400 CFM of ventilat%n air are delivered from each Air Handling Unit.
In the " Diesel On" mode, a higher rate of air (67,900 CFM) is delivered frs.
the Unit, to supply combustion air and ventilation air to the DG area.
In the process of finalizing the design it was concluded that the system operation can be improved by having a directly " ducted" or " piped" connection for combustion air, from the suction side of the Air He,dling
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. Pag] 2.-
^ Unit, to the DG machine. Thts the starting of the DG does not have to be fully coordinated with thn " Diesel On" mode of the HVAC system.
This design improvement would make the DG combustion air intake a part of the HVAC system air intake for the area. However, the related pro-blem, as described aboye, was not realized at the time of the design
_ improvement because the DG machines have the capability'of withstanding a.,d operating against the potential negative pressure occurred in a tornado condition, whereas the HVAC ducts are not designed for this pressure. The imcompatibility was _ discovered during a review of the design of the DG combustior, air intakes to verify _ their conformance to the requirements of SRP 9.5.8.
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