ML19325C438
| ML19325C438 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 10/04/1989 |
| From: | Morris K OMAHA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LIC-89-911, NUDOCS 8910160252 | |
| Download: ML19325C438 (5) | |
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Omaha Public Power District 1623 H3rney Omaha. Nebraska 68102 2247 402/536 4000 October'4, 1989 i
LIC-89-911' U. S.1 Nuclear Regulatory Commission ATTN:. Document Control Desk 1
- Mail Station PI-137 1
Washington,_DC-20555
References:
1.-
Docket No. 50-285 2.
Letter OPPD (K. J. Morris) to NRC (Document Contr-ol Desk) dated September 8, 1989 (LIC-89-850) 3.
-Letter OPPD (K. J. Morris) to NRC (Document Control Desk) dated August 28, 1989 (LIC-89-770)
Gentlemen:
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SUBJECT:
Request for Enforcement Discretion relative.to the Control Room HVAC System i
Reference 2 provided additional information concerning OPPD's request for a
Enforcement Discretion relative to the Control Room HVAC System. In a telephone conversation on September 25, 1989, with Mr. Paul Bemis and other members of my staff, Mr. Tony Bournia of the NRC Staff requested further information on this matter.
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Per Mr. 80urnia's request the following information is provided on the 9 in.
I water allowable pressure drop.
From the information supplied by the filter manufacturer, Flanders Filters,
'the following pressure drops were obtained:
dP Clean (" water) dP Dirty (" water)
Prefilter
.62" 1.24" HEPA Filter
.82" 1.64" Carbon Filter 1.25" N/A 1
With the filter arrangement of 1 prefilter, 2 HEPA filter banks, and 2 carbon filter trays per unit, the following total pressure drops are obtained:
Clean:
.62 + (2x.82) + (2x1.25) - 4.76 in, water j
Dirty:
1.24 + (1.64x2) + (1.25x2) - 7.02 in, water
'In addition to this, pressure drops for the air straightener, heater and velocity losses must be added.
8910160252 891004
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PDC annioum n g, g onnonu m j i ql s sa
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U. S. Nuclear Regulatory Commission LIC-89-911-Page 2 The manufacturer _ sized the motor blowers to provide rated flow at 9 in, water filter pressure drop plus 1 in, w.g. external pressure drop. This allows for l'
added operational flexibility as the HEPA filters can be loaded in excess of the recommended changeout dP without decreasing removal efficiency.
The 9 in.
water pressure drop included in SAO-89-002 is thus derived from a combination of recommended values from the filter manufacturer, motor-blower capability, and operational experience.
We hope this information resolves any questions concerning the allowable filter pressure drop included in SAO-89-002.
During the telephone call on September 25, 1989, Mr. Bemis agreed to provide three drawings at the request-of the NRC Staff. These drawings are attached.
Also, this letter confirms the statement made by Mr. Bemis concerning the applicability of the present Technical Specifications to the new HVAC System:
Until the NRC's approval of FLC-89-002, OPPD will test the new filters as L
follows: 1. OPPD will commission the new filters using modification (MR-FC-87-20) test' procedures to demonstrate initial operability; 2.
Subsequent testing will be perforrad utilizing revised surveillance l
procedures. All testing procedures and acceptance criteria will meet the requirements of the existing Technical Specifications.
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If you have further questions or comments, please contact us.
Sincerely,
.(). Morris Division Manager Nuclear Operations Attachments:
1.
Drawing, information only, CRHVAC 2.
Drawing, information only, 2V-N63-G16, Size:
GG16 3.
Drawing, information only, Seismic E-6 (304) L Type I Filter Train l
KJM/pjc c:
LeBoeuf, Lamb, Leiby, and MacRae R. D. Martin, NRC Regional Administrator A. Bournia, NRC Project Manager P. H. Harrell, NRC Senior Resident Inspector
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PERFORATED SCREEN
' SPECIF ATIONS
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- FRAME-14 GA. -304 S/S i
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SCREENS-26 G T-304 S/S j
Z-BARS-18 GA. T-304 S/S POP RIVET-T-305 S/S
- 2. CONSTRUCTION: WELDED AND POP RIVETEE j 15 N
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- 3. CARBON: CAMERON CAFv80N INC.
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[ Gasket TYPE CY-4069 8 X 16 MESH i
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1/4" Thk. Neoprene NUCLEAR GRA[E CARBON s
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- 4. F/CTORY TEST: UNITS ARE TO BE
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WITil FREON TO ENSURE A MINIMUM 0 Mg 99.9% MECHANICAL EFFICIENCY.
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