ML20076D713
| ML20076D713 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 07/25/1991 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TAC-71624, TAC-71629, NUDOCS 9107300181 | |
| Download: ML20076D713 (5) | |
Text
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Ju;v 25, 1991 o.s ;> w,o
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Nuclear Regulatory Commission Attn:
Document Control Desh Washington, DC 20555
Subject:
Deavor Valley Power Station, Unit No. I and No. 2 DV-1 Docket No. 50-334, Licenne No. DPR-66 HV-2 Docket No. 50-412, Licenso No. NPP-73 NRC Generic Letter No. 88-14 (TAC No. 71624 and 71629)
Ref:
1)
Duquesne Light Company letter to the NRC dated February 17, 1989 2)
Duquesne Light Company letter to the NRC dated May 3, 1989 3)
Duquesne Light company letter to the NRC dated February 14, 1990 The purpose of this letter is to inform you that these modifications which we had committed to implcment on the Beaver Valley Unit No.
1 Control Room HVAC Instrument Air System and the Intake Structure lastrument Air System by the end of the eighth refueling outage have been completed.
This letter will also cor, firm that wo did complete, as scheduled, the modifications to the Beaver Valley Unit No. 2 Instrument Air System that were planned to be made by the end of the Unit No, 2 second refueling outage.
Additionally, we want to info.m you of changes that will be made in the frequency for performance of tests to monitor air quality on certain instrument air systems (IAS).
On August 8,
1988, NRC Generic Letter No. 88-14, " Instrument Air System Problems Affecting Safety-Related Equipment", wes ist,ued to all' holders of Operating Licenses or Construction Permits for Nuclear Power Reactors.
By letter dated February 17, 1989, Duqleone Light Company provided a
response indicating the actions that had been completed and a
schedule for the completion of the remaining activities.
By letters dated May 3,
1989 and February 14, 1990, Duquesne Light Company provided additional information and an update 7f the status of actions taken at Beaver Valley Unit No. 1 and Unit No. 2 to meet the requirements of NRC Generic Letter No. 88-14.
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Heavor -Valloy power Station, Unit 110, 3 and tio. 2 DV-1 Docket 110. 50-314, Licence 110. DPH-66 DV-2. Docket No. 50-412, Licenso 110. NPF-73
- NHC Generic Lotter 110, 88-14 (TAC tio. 73624 and 71629)
Page 2 Our plans at the time of the lant statun update was to modify the piping arrangement of the Unit No. 1 Control Room Ventilation Syntela IAS no that all of the componentn norved by the nyntom would receive filtered air.
This modification has been accomplished.
Wo have also installed an oil froo air compressor, a dryer and an attarfilter in the Intake Structuro I AS.
Theno changen nhould bring about a noticeable improvement in the air quality of that syutem.
Implementation of the Intake Structure IAS and the Control Room Ventilation System IAS modificationa completos thoue Unit No. 1 design changes that have been committed to in responno to Generic Letter No.
88-14 except for the modifications to the Unit No. 1 Containment IAS which are scheduled for the ninto refueling outage.
During the Unit No. I eighth rofueling outage we also mado nome i
changen to the Unit
-No.
1 Compressed Air System.
An enginocring otudy of the Unit No. 1 Compressed Air System and air quality tests on the Station 1AS Icad to the dociolon to replace the three existing air comprensors in the Compressed Air System with two now, larger capacity,-
oil free compressora.
Those air compressoro uupply compronsed air to the Station IAS and componentn outsido the containment except for the Intake Structure and the Control Room llVAC System.
A redundant air dryor, air filtor, a dew point monitoring call and nomo flow measuring devicon woro also added to the Station Instrument Air Cyntom.
We expect thoue changes to enable the Unit No.
1 Station IAS to consistently meet ISA G7.3 air quality requirements.
Testing to monitor air quality of the Deavor Valley Unit No. 1 and. ' Unit No. 2 Station IAS, the Unit No. 1 Control Room IIVAC I AS, tae Unit No.
2 Containment IAS and the Intako Structure IAS has been conducted on a
periodic basis.
This monitoring program has boon in effect sinco it wan implemented as-discussed in our initial response to Generic Lotter 88-14.
-Based on the information obtained from this monitoring program an1 the design changen'that have been implemented or planned for cortain instrument air systems, a reduction in the r
- pe rf or inance frequency 1or some testing 10 planned.
The frequency of tecting for flammable gas in all systems that are routinely tested will be changed from wookly to quarterly.
This includen the Unit No. 1 Station IAS, the Unit-No. 1 Control Room llVAC
- IAS, tho-: Intake-- Structuro I A S,-
the Unit No. 2 Station IAS and the Unit No.
2 Containment IAS.
No flammable gason have been detected to dato-during the monitoring program for these systems.
Continued-expenditure of manpower to run the flammable gan checks more frequently than once per quarter is not considered warranted.
4
!!Oaver Valley Power Station, Unit 110 I and 140. 2 11V-1 Docket IJo. S0-334, Licence !Jo. DPR-66 DV-2 Docket No. 50-412, Licenne 110 11PF-73
'NRC Generic -Letter flo. 88-14 (TAC No. 73624 and 71629)
Page 3 i
The i requent.y of testing the Unit No.
2 Station IAS will be changed from weekly to quarterly for the oil test and from weekly to monthly for the dew point and particulates.
Tho system unen oil Iroe compressoro and oil has not been detected during the weekly tonto.
Sinco Generic Letter No. 88-14 was initially incued, several changen have - been made to the Unit No. 2 Station IAS to improve the air dew point and particulato quality.
A larger capacity air dryer has boon permanently installed in the ayatem to improve the air dew point.
A dew point nieter was inntalled at the outlet of the air dryer which continuously displayn the dryer outlet dew point locally and provides a
local and control room alarm should the dew point rise to an unacceptable value.
A 0.1 micron coalencent filter has been installed downntream of all carbon steel componenta to remove particulates.
Completion of these modificationo natisfies the commitmento we made in Reference 1 regarding changes to thin syntem.
Testing of the nyntem for dew point and particulatou cubneguent to those changen han demonstrated the air quality meets requirements when the componento are in service and functioning properly.
Two months after the implementation of the previously discussed design change which installed larger oil free comprensorn, an air j
f11ter downstream of the carbon stool components and a dew point
{
monitoring cell at the outlet of the air dryern with local readout and local and control room alarms, the frequency of testing tho-Unit j
No.
1 Station II.S will be changed from weekly to quarterly for the oil test and monthly for the dew point and particulates tacts.
Wookly testing will be performed for approximately two months after implementation of the changen to confirm acceptable air quality after i
which tine the testing f requency will be reduced.
i 4-The frequency of testing the Intake Structure IAS for oil will be i
reduced from weekly to quarterly approximately two months after the oil free compressor has.bcen installed in the system..
The frequency 1
of testing the cy. tom--for dew point and particulates will be reduced from wookly to monthly at the same time.
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The = frequency of testing the Unit No. 2 Containment IAS for oil I
will be roduced f rom wookly to quarterly.
This cystem utilizes oil j
frco air -compressors and__the air quality testing performed to date has not detected any oil in the nyatom.
No chango in the frequency I
o_f testing this system for dew point and particulatos in planned at thia timo..
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Irequency of tenting the Control Room HVAC IAS for particulates will be reduced from weekly to monthly approximately two months after system modifications. _The frequency of testing for oil and-dowpoint will not be changed at thin time.
I f additional changen are-made to the system or the results of continued testing of air quality provides a basis for further changes, act2on may be taken at that timo to again change test frequencien,
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lleavor Valloy Power Station, Unit flo. I and flo. 2 DV-1 Docket 11o. 50-334, Liconno llo. DPR-66 flV-2 Docket 110, 50-412, Licenso llo, ll P f'-7 3
'llRC Generic Letter 110 88-14 (TAC 110. 71624 and 71629)
Page 4 i
If you have any questions regarding the planned changes in the conting frequency for the various air systems please contact Drexel williama at (412) 393-5226, i
Sincoroly, ico Presid. int fluclear Group cc:
Mr. J.
Boall, Sr. Resident Inspector Mr. T. T.
Martin, liRC Region I Administrator Mr. A. W. DeAgazio, Project Manager Mr. M.
L.
Bowling (VEPCO) 9
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COMMO!1 WEALTH OF PE!1tiSYLVA!11 A)
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COUliTY OF BEAVER
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n day of _
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- 1991, on this s
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Commonwealth ar.d tounty, personally appeared J.
D. Sieber, who being sworn, deposed,-and said that (1) he is Vice President - 11uclear duly-of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said company, and (3) the statements set forth in the submittal are true and correct to the best of his knowledge, information and belief, a
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