ML17304B324

Provides Supplemental Response to Generic Ltr 88-14 Instrument Air Supply Sys Problems Affecting Safety-Related Equipment. Util within ISA Standard of -7 F for Max Allowable Dewpoint

ML17304B324
Person / Time
Site:	Palo Verde
Issue date:	04/27/1989
From:	Karner D ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
161-01881-DBK-J, 161-1881-DBK-J, GL-88-14, NUDOCS 8907200394
Download: ML17304B324 (10)

Text

gC CP~RA7ED D1STKBUTION DEMO?iSTRE 0

I REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:8907200394 DOC.DATE: 89/04/27 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde~ Nuclear Station, Unit 1, Arizona Publi

., 05000528 STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 STN-50-530 Palo. Verde Nuclear Station, Unit 3, Arj.zona Publi, 05000530 AUTH.NAME AUTHOR AFFILIATION "

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Arizona Public Service Co.

(forme'rly Arizona Nuclear Power RECIP.NAME RECI'PIENi AFFILIATION Document Control Branch (Doc~en)'ontrol Desk}

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SUBJECT:

Provides supplemental response to Generic Ltr 88-14 "Instrument Air Supply Problems Affecting...."

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NOTES:Standardized plant.

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05000528 05000529 05000530 RECIPIENT ID CODE/NAME PD5 LA CHAN,T DAVIS,M.

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PHOENIX, ARIZONA85072-2034 161-01881-D8 K/JMQ April 27, 1989 Docket Nos.

STN 50-528/529/530 U. S. Nuclear Regulatory Commission Attention:

Document Control Desk Hail Station Pl'-137 h'ashington, D.

C.

20555

References:

(A)

Letter from NRC to all Holders of Construction Permits for Nuclear Power Reactors dated August 8,, 1988.

Subject:

Generic Letter 88-14 (B)

Letter from D. B. Karner, APS to NRC dated February 20, 1989.

Subject:

Generic Letter 88-14

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2 and 3

Supplemental

Response

to Generic Letter 88-14 "Instrument Air Supply System Problems Affecting

. Safety-Related Equipment" File:

89-010-026;. 89-056-026 Generic Letter 88-14, Item 1

recommended verification by test that actual instrument air quality is consistent with manufacturer's recommendations for individual components served.

Reference (B) stated that the air quality data will be taken for approximately one month in Unit 2 in order to obtain adequate test data.

It also stated that a supplemental letter would be provided by April 28,

1989, indicating whether any improvements or modifications will be made and providing the schedule for completion.

See Attachment 1 for response.

Also, Generic Letter 88-14, Item 3 recommended a verification of the design of the entire instrument air system.

Reference (B) stated that the review is expected to be completed during the first quarter of 1991.

8907200394 890427 PDR ADOCK 05000528 P

PDC

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U. S. Regulatory Commission Attention:

Document Control Desk Page 2

161-01881-DBK/JMQ Apri.l 27 1989

'However,.

a lim'ited scope design review has

already, been,performed',

also the

,schedu'le for completion of the formal review has been advanced'nd is expected to be completed during the 'first quarter of 1990.

See Attachment 2 for details.

Very truly yours,.

D. B. Karner Executive Vice President DBK/JHQ/)le Attachments cc:

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H. J.

J.

B.

Polich Chan--"

Davis Martin (all w/attachments)

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Attachment 1

Unit 2 Test Results/Evaluation Dewpoint, particulate and hydrocarbon tests were conducted on the Instrument Air System to ascertain the quality of instrument air delivered by air compressor/dryer system.

The design dewpoint for the instrument air system at Palo Verde is- -40' at 125 PSIG and the test data obtained supports this temperature requirement.

The dew point temperatures, as

measured, are quite acceptable as they range between

-58' to -85'F corrected to a line pressure of 125 PSIG.

The minimum winter design temperature as described in Section 9.4.2 of the PVNGS FSAR Tabl'e 9.4-1 is ll'.

The ISA-S7.3-1975 "Quality Standard for Instrument Air" recommends that the dewpoint at line pressure be at least 18' below the minimum temperature (ll') to which any part of the instrument air system is exposed at any season. in the year.

Therefore, the maximum allowable dewpoint at PVNGS is

-7' and we are well within the guidelines of the ISA Standard.

However, tests will be conducted during our most humid months to verify that dewpoints can be maintained at -40', or below, at a line pressure of 125 PSIG at a normal flow rate.

ISA-S7.3-1975 recommends that the particle size in the air stream shall not exceed 3 microns.

The test runs have given particle sizes ranging from

.5 microns to 15 microns.

Only two particles of the 15 micron size were encountered in 25 measurements taken in 10 days during the test.

On the

average, the particle size was approximately

.65 microns.

The oil content shall be as close to zero per weight ratio (w/w) or volume ratio (v/v) as possible per the ISA Standard and under no circumstances shall it exceed one ppm w/w or v/v under normal operating conditions.

The average oil content in the air samples taken was 0.03 ppm.

The following action resulted from the evaluation of the air quality data:

Change the afterfilter internals (cartridge) from the current 1

micron rated filter to a.45 micron rated filter or smaller in Units 1, 2, and 3.

This task will be completed before the Unit 1, 2,

and 3 restart from the current outages

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Following the upgrade of the filters, the air quality test will be performed on a periodic basis.

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Attachment 2

Desi n Review of the Instrument Air S stem A limited scope design review of the instrument air system has 'been performed using the documents that represent the actual installation at the plant.

The design basis documents reviewed were Regulatory Guides,,

10 CFR 50 and the Design Criteria Manual.

A number of design output documents, design modification packages and'ther associated engineering: documents were also reviewed.

This limited scope review 'ndicates that the system del'ivers, as desi'gned, quality. air to meet or exceed the requirements of the design basis.:

The complete review for the adequacy of the existing. design basis and development of

,the Design Basis Manual'or Instrument Air will be completed during the first quarter of 1990.

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