ML19270H004

From kanterella
Jump to navigation Jump to search
Submits Info Requested by NRC on 790525 Re Design, Fabrication History, Preservice/Inservice Inspec & Operating History of Facility Feedwater Lines
ML19270H004
Person / Time
Site: Beaver Valley
Issue date: 06/20/1979
From: Dunn C
DUQUESNE LIGHT CO.
To: Stello V
Office of Nuclear Reactor Regulation
References
TAC-11766, NUDOCS 7906220351
Download: ML19270H004 (4)


Text

. .

$YL

. "3>tp5s (412) 471-4300 g 435 Sixth Avenue t sburgh, Pennsylvania June 20, 1979 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attention: Victor Stello, Jr., Director Division of Operating Reactors Washington, DC 20555

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Information on Feedwater Lines ,

Gentlemen:

The following information has been assembled in response to Mr. Stello's Fby 25,1979 request for information concerning the design, fabrication history, preservice/ inservice inspection, and operating history of the Beaver Valley No. 1 Unit feedwater lines.

A. DESIGN

1. As-built piping or isometric drawings of feedwater line to steam generator sparger within containment, including support type and locations, pipe schedule, dimensions, restraints, valves.

Per Attached drawings:

A. 11700-6.24-62 Sheets 1 thru 30 B. Il700-RP-2A & 2B

2. Stress or fatigue analysis results.

Per attached drawings:

11700-MSK-102 Sheets Al thru A15 B. FABRICATION HISTORY

1. Materials Information:

2348 052 A. Steam Generator Sparger: ASIM 106 Grade B B. Steam Generator Feedwater Nozzles: ASTM SA 508 Class 2 C. Feedwater Piping within Containment: ASTM A106 Grade B, Seamless Schedule 80 790622035l

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334

, Information on Feedwater Lines

, Page 1

2. Details of Welding Processes Used, Including Preheat, Joint Configuration, Use of Backing Rings, Post Weld Treatments.

A. Nozzle-to-Pipe Joint

, 1. Nozzle End Weld Prap: per drawings ll700-4.13-10A ll700-4.13-llA Detail "C" 11700-4.13-13A Detail "AC"

2. Piping End Weld Prep: per drawing 920 9-B Sheet 65

, 3. Nozzle-to-Pipe Weld Data - Steam Generator lA:. per attached Microfilm frames 00650 thru 00658, 00913, 00921, 00923, and Heat Treatment Chart No. 511

4. Nozzle-to-Pipe Weld Data - Steam Generator 1B per attached Microfilm frames 00746 thru 00764, 00914, and Heat Treatment Chart No. 514
5. Nozzle-to-Pipe Weld Data - Steam Generator IC: per attached Microfilm frames 00888 thru 00904, 00915, 00919, 00920, and Heat Treatment Chart No. 581 Attached Heat Treatment Chart Index Sheets (Microfilm frames 01590 & 01595) and Control Isometric Sneets 9209B, Sheets 1, 2, and 3 are applicable to Items 3, 4, and 5 above.

In addition, attached marked-up drawing 9209B Iso.

62 can be used as a guide to identify the field weld numbers of the various joints, which differ from the Stone & Webster design identification numbers.

B. Nozzle-to-Sparger Weld Data No welding performed on this joint. Sparger has a close tolerance slip fit with nozzle via a thermal sleeve insert.

C. INFORMATION ON PRESERVICE/ INSERVICE INSPECTION AND OPERATING HISTORY OF PWR FEEDWATER LINES

1. The Preservice Inspect' ion was performed in accordance with the 1971 Edition of ASME B&PV Code,Section XI. This edition did not require inspection of the feedwater system welds for preservice.

2348 053

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Information on Feedwater Lines Page 1

's

\ 2. Radiographic examinations of the pipe to steam generator to nozzle welds was performed on June 16, 1979. All three lines indicated the presence of circumferential cracking. Necessary repairs shall be performed prior to a return to service.

3. The schedule for the next inspection interval on the feedwater system calls for the following: (See DLW-2-2220,' Attached)
a. Loop #2, 16" Circumferential Butt Weld #4, Volumetric Exam, 100%.
b. Loop #2, Welded Support #1, Surface Exam
c. Loop #2, Support Components A, B, Visuals During the 1st inspection interval the following was performed:

(See DLW-2-2210, Attached) *

a. Loop #1, 16" Feedwater Weld #5, 100% Volumetric
b. Loop #1, 16" Feedwater Welded Support #1, Volumetric Exam
c. Loop #1, 16" Feedwater Supports A and Welded Support #2. Visual Exam.
4. See Attachment 11.
5. Beaver Valley maintains feedwater chemistry using morpholine and hydrazine. Ammonia is only added during layup conditions. Control parameters are as follows:

pIl 9.2 - 9.6 0 < 5 ppb 2

Ilydrazine [02] + .005 ppm Other parameters monitored include conductivity, cation conductivity, mopholine and hydrazine concentration, and iron and copper content.

Oxygen, pli, and cation conductivity values are continuously recorded.

During operation the past year, feedwater data has been in the following range:

2348 054

Feaver Valley Power Station, Unit No. 1 Docket No. 50-334

, Information on Feedwater Lines

, Page ',

'g pli 8.6 -

9.7 0 < 5 ppb -

300 ppb 2

Cation Conductivity 0.2 -

> 10 pmho Conductivity 2.0 - > 10 pmho Morpholine 0.8 -

10.9 ppm liydrazine 0.1 -

2.0 ppm Iron 3 -

98 ppb Copper 3 ppb (Max)

If you ha'a any further questions on this matter, please contact my office.

Very truly yours, C, / tCm ._.-

C. N. Dunn Vice President, Operations Attachments 2348 055