ML17298B952

Forwards Technical Justification on Table 10.3.4-2, Deletion of Abnormal Limits, in Response to 850221 Request for Addl Info Re 841221 & s Concerning CESSAR Changes & Chemistry Control Sampling Sys,Respectively

ML17298B952
Person / Time
Site:	Palo Verde
Issue date:	03/08/1985
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Knighton G Office of Nuclear Reactor Regulation
References
ANPP-32099-EEVB, NUDOCS 8503140375
Download: ML17298B952 (20)

Text

REGULATO

.INFORMATION DISTRIBUTION TEM (RIDS)

ACCESSION NBR:8503140375>>

DOC ~ DATE; 85/03/08 NOTARIZED: YES DOCKET FACIL:STN 50-528 Palo Verde Nuclear Stations Unit ig Ar)zona Publ) 05000528 STN 50 529 Palo Verde Nuclear Station~

Unit 2g Arizona Publ) 05000529 STN 50 530 Palo Ve'rde Nuclear Station~

Unit 3~ Arizona Publi 05000530.

AUTH',NAME'UTHOR AFFILIATION VAN BRUNTiE ~ ED Arizona Public Service Co ~

RECIP,NAME>

RECIPIENT AFFILIATION KNIGHTONg G ~ W ~

Licensing Br'anch 3

SUBJECT:

Forwards technical Justification on Table 10@3' 2t "Deletion of Abnormal Limitsi" in response to 850221 request for addi info re 641221 8

850131 1 trs concerning, CESSAR changes 8 chemistry control sampling sysirespectively+

DISTRIBUTION CODE!

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OL ~ 12/31/84 Standardized plant ~

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05000528 05000529 05000530 RECIPIENT ID CODE/NAME~

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Arizona Nuclear Power Project P.o. BOX52034 4

PHOENIX, AAIZONA85072-2034 ANPP-32099-EEVB/WFQ MArch 8, 1985 Director of Nuclear Reactor Regulation Mr. George W. Knighton, Chief Licensing Branch No.

3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3

Chemistry Control and Sampling Systems Docket Nos.

STN 50-528(License No. NPF-34)/529/530 File:

85-056-026'.l.01.10

References:

(1) Letter to G.

W. Knighton, NRC, from E. E.

Van Brunt, Jr.,

APS, dated December 21, 1984;

Subject:

Justification for CESSAR Changes.

(2) Letter to G.

W. Knighton, NRC, from E. E.

Van Brunt, Jr.,

APS, dated January 31, 1985;

Subject:

Chemistry Control and Sampling Systems.

(3) Telephone conversation held on February 21, 1985 between APS and the NRC;

Subject:

NRC Questions on Steam Generator (SG) Chemistry for License Condition 23.

Dear Mr. Knighton:

During the telephone conversation held on February 21, 1985, between ANPP and the NRC (attachment 1), the NRC indicated that additional information was required to complete the review of References (1) and (2).

ANPP agreed to provide technical justification regarding Table 10.3.4-2 "Deletion of abnormal limits" (Reference (1)) for each of the changes, accompanied by confirmation that the changes were made in accordance with the NSSS vendor's guidelines (Reference (2)).

Attachment 2 contains the revised pages to Reference (1) which provide the technical justification for each of the changes made to Table 10.3.4-2.

Attachment 3 contains the revised page to Reference (2) which provides confirmation that the changes made to Table 10.3.4-2 are in accordance with the NSSS vendor's guide-lines.

ANPP understands that this is the last remaining issue to close out PVNGS Unit 1 License Condition 2.C (23).

We believe that the information contained within this submittal provides NRC sufficient information to close the issue.

Please contact Mr. W. F. Quinn of my staff if you should have any questions on this matter.

8503140375 850308 PDR ADOCK 05000528 P

PDR Very truly yours EEVB/KLM/mb Attachments E. E.

Van Brunt, Jr.

Executive Vice President Project Director

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Mr, George W. Knighton Chemistry Control and Sampling Systems

'ANPP-32099 Page 2

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A. Licitra R. P.

Zimmerman (All With Attachments)

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ANgP-32099 STATE OF ARIZONA

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COUNTY OF MARICOPA)

I, Edwin E.

Van Brunt, Jr.,

represent that I am Executive Vice President, Arizona Nuclear Power Project, that the foregoing " document has been signed by me on behalf of Arizona Public Service Company with full authority to do so, that I have read such document and know its contents, and that to the best of my knowledge and belief, the statements made therein are true.

Edwin E.

Van Brunt, Jr.

Sworn to before me this l2.

day of

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, 1985.

My Commission Expires:

My'Commission Expires Nov. 12, 1988

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Attachment 2

Revision to the Attachment (page

2) of Letter to G.

W. Knighton from E.

E.

Van Brunt, Jr.,

dated December 21, 1984 (ANPP-31561).

1 ll

Table 10.3.4-1 Change Deletion of suspended solids limit Reason Control of suspended solids in the steam generator is shifted to the feedwater and condensate (Table 10.3.4-2) wherein control limits are in effect for total iron and total copper.

Table 10.3.4-2 Change Deletion of abnormal limits Reason The variables that are only given "Normal Specifications" in Table 10.3.4-2 are diagnostic in nature.

The, variables and the sample locations for which "abnormal limits" are retained are controlling in nature.

Each parameter for which the abnormal limit was deleted is discussed below.

"Conductivity (Intensified cation) (Feedwater)"

Control of the cation conductivity is placed at the steam generator blowdown (Table 10.3.4-

1) where normal specifications and abnormal limits are provided, along with appropriate immediate shutdown limits.

Thus, conductivity is controlled at the controlling location (steam generator) rather than at a diagnostic location (feed and condensate).

"Dissolved Oxygen" Abnormal limits on'ondensate oxygen are retained in note (2) to Table 10.3.4-2.

The feedwater dissolved oxygen abnormal limit has been deleted as it is a diagnostic indication of excess oxygen in the condensate system.

Thus, oxygen is controlled at the potential source (condensate system) rather than at a diagnostic location.

"Sodium" Control of sodium is placed at-the steam generator blowdown (Table 10.3.4-1) where normal specifications, abnormal limits, and appropriate shutdown limits are provided.

Thus, sodium is controlled at the steam genrator rather than at a diagnostic location (feed and condensate).

"Copper (Feedwater)"

Excessive copper concentration in the feed system is indicative of excess oxygen in the condensate system.

Thus, by applying controls on oxygen concentration, copper concentration is controlled.

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"Iron (Feedwater)

Excessive iron concentrate in the feed system is indicative of excess oxygen in the condensate system.

Thus, by applying controls on oxygen concentration, iron concentration is controlled.

By restricting "abnormal limits" to only the controlling variables and the controlling locations, the specifications are directed toward treating causes, rather than symptoms of chemistr'y upsets.

Table Change Reason 10.3.4-2 Deletion of ammonia limits Control of ammonia is substituted with control limits on pH and total iron and copper to prevent corrosion products from entering the steam generator.

Table 10.3.4-2 Change Deletion of silica Reason Control of silica is shifted to the steam generator (Table 10.3.4-1).

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Attachment 3

Revision to the Attachment (page 5) of Letter to G.

W. Knighton from E. E.

Van Brunt, Jr.,

dated January 31, 1985 (ANPP-31831).

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Item 3c (CESSAR Table 10.3.4-1 and 10.3.4-2):

Are the changes to secondary chemistry limits consistent with current industry guidance?

Response

The chemistry changes reflect the current water chemistry guidelines furnished by Combustion Engineering for application in CE NSSSs.

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