ML19324B452
| ML19324B452 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 10/24/1989 |
| From: | Creel G BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-88-14, NUDOCS 8911060353 | |
| Download: ML19324B452 (3) | |
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BALTIMORE i
GAS AND EL'dCTRI J
r CHARLES CENTER. P. O. BOX 1476. BAl.TIMOR E, MARYLAND 21203 GroRGE C. CREEL Vict Passiotut Nuctsan Enriov
,s (soi) eeo naes October 24, 1989' i
U. S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
Document Control Desk
SUBJECT:
Calvert. Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Generic Letter 88-14, Instrument Air Supply System Problems Affecting Safetv-Related Eauloment
REFERENCE:
(a) Letter from Mr. S. A. McNeil (NRC) to Mr. C. G. Creel (BG&E),
dated September 20, 1989, same subjec:
?
Gentlemen:
Reference (a) requests additional informatica which will facilitate NRC staff tracking and evaluation ~ of the completion of the ' activities associated with Generic Letter 14. Generic Letter 88 *
- concerns possible adverse effects of instrument t.ir system deficiencies on safety-related equipment. Our response to Refeience (a) is provided ir4 Enclosure (1).
Should you have any further questions.garding this matter, we will be pleased to discuss them with you.
Very truly yours, 8913060353B[O i7 PDR ADOCK O PNV i
P GCC/DLS/diin Enclosure cc:
D. A. Brune, Erquire J. E.
Silberg, Esquire R. A.Capra,NRC S. A. McNeil, NRC
'g'7 W. T. Russ*ll, NRC J.
A. Galla, Jr., NRC f
T. Magette, DNR p
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ENCLO$t?RE (1)
L RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION GENERIC LETTER 88-14, INSTRUMENT AIR SUPPLY SYSTEM PROBLEMS AFFECTING SAFETY.RELATED EQUIPMENT 1.
NRC ITEM NO.
I 2
Please provide the 'etual Units I and 2 instrument air system particulates-per-cubic-foot results, including specifications and a discussion of why no adverse effects are posed, to' the operability of any specific safety-related components, by any high (i.e.,
out-of-vender-specification) particulate concentrations.
BG&E RESPONSE The actual Unit 1 and 2 instrument air system particulates-per-cubic-foot iesults are given below, along with the. size distribution in each sample:
P UNIT I UNIT 2 After SRW Diesel After SRW Diewi Filter Room Room Filter Room Room Particulates per 4.7 5.6 3.0 2.8 1.4 1.0 cubic foot Particle Size Percent Size Distribution (Microns) 3-5 32%
39%
63%
62 %
35%
36%
5 - 15 52%
42%
26%
20%
47%
40%
15 - 25 13%
13 %
6%
12 %
10%
13 %
25+
3%
6%
5%
5%
8%
12 %
SRW = Service Water Sample flowrates were all approximately 5 scfm.
These are the same results reported in our May 25, 1989 response to an April 21, 1989 request for additional information.
Our air quality specifications call for clean, dry air with no particulates larger than specific vendor requirements reaching individua' air-operated components.
The most limiting component (a Masonellan 8005 current to pressure coiiverter) rcouires clean, dry air wit'i no particulates larger than 5 microns servicing it.
Even though the air header does contain some particulates larger than 5 microns, the installed.-
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L ENCLOSURE (1) j; i
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION GENERIC LETTER 88-14, INSTRUMENT AIR SUPPLY SYSTEM PROBLEMS AFFECTING SAFETY-RELATED EQUIPMENT filter /reculator on these components will remove all of those particulates larger than l
5 microns. Therefore, we helieve no particulate larger than 5 microns will reach the components. Also, using very conservative assumpt ons for factors such s filter size, particulate
- size, flowrate, and petticulates-per-cubic-foot, we calculate that the filters have a minimum service life of more than thirty years. Therefore, particulate fouling of the component filter / regulator is not a concern for instrument Air component operability. This Fame reasoning holds true for coinponer.ts whose vendor requirements are less restrictive than the 5-micron particulate size limit.
These particulate results, plus Instrument Air dewpoint and hydrocarbon analyses reported to you previously, indicate that our Instrument Air meets site and vendor recommendations for air quality.
~
NRC ITEM NO.
2 The schedule for completion of tests on
.he Unit I air-operated safety-related components. Your May 25, 1989 letter stated that these tests would be performed during a maintenance outage scheduled for fall 1989. As Unit 1 is now in an extended outage, with restart planned for no earlier than Novmber 1989, and as the Unit I maintenance outage has been deferred until spring 1990, the NRC staff does not have an accurIte understanding of your intended schedule for completing Unit I testing.
1 NG&E R ESPONSE 1
Instrument Air testing required by Generic Letter 88-14 will be complete on Unit I before the start-up of the Unit.
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