ML19208C896

Responds to IE Bulletin 79-17, Pipe Cracks in Stagnant Borated Water Sys at PWR Plants. Facility Has Experienced No Apparent Cracking in Listed Sys.Lists Nondestructive Examination & Inservice Insp Procedures

ML19208C896
Person / Time
Site:	Davis Besse
Issue date:	08/24/1979
From:	Crouse R TOLEDO EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 7909270627
Download: ML19208C896 (15)

Text

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TOLEDO

%mm EDISON August 24, 1979 Docket No. 50-346 License No. NPF-3 Serial No. 1-84 v

Mr. James G. Keppler Regional Director, Re~ ion III Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, II'inois 60137

Dear Mr. Keppler:

This letter is in response to IE Bulletin 79-17 dated July 26, 1979 (Log No. 1-216), as applicable to Davis-Besse Nuclear Power Station Unit No. 1. Attached is Toledo Edison's required 30 day response to Item No. 1.

Yours very truly, n

f I ./2.exx n -n RICilARD P. CROUSE ACTING VICE PRESIDENT ENERGY SUPPLY RPC/TWH Attachments jh e/6 pG N T100$?%f 2 THE TOLEDO EOISON COMPANY ED: SON PLAZA 300 MADISON AVENUE TOLEOO, OHIO 43652

DOCKET NO. 50-346 ATTACHMENT 1 SERIAL NO. 1-84 ITEM 1(a):

Provide the extent and dates of the hydrotests, visual and volumetric examinations performed per 10 CFR 50.55a(g) (Re: IE Circular 76-06 enclosed) of identified systems. Include a description of the nondestructive examination procedures, procedure qualifications and acceptance criteria, the sampling plan, results of the examinations and any related corrective actions taken.

RESPONSE

The extent of Inservice Inspection (ISI) performed at the Davis-Besse Nuclear Power Station Unit No. 1 (DB-1) on the Makeup and Purification System, Core Flood System, High Pressure Injection / Low Pressure Injection System, Decay Heat Removal System, and Containment Spray System, in accorda2ce with 10 CFR 50.55a(g) was performed on the Class 1 portion of these systems and components. The Spent Fuel Pool Cooling System and components are Class 2 and Class 3 and did not receive a preservice inspection under ASME Bciler and Pressure Vessel Code, Edition 1971 through Winter 1977 Addenda.

NRC IE Circular 76-06 issued November of 1976, referenced in Paragraph 1(a), of IE Bulletin 79-17, was addressed to operating plants. Because Davis-Besse Unit No. I received its operating license on April 27, 1977, no action was taken as a result of the circular.

The Nondestructive Examination (NDE) utilized on Davis-Besse Unit No. 1 for those Class 1 systems as noted above are listed on Attachment 2. Attachment 3 provides the Procedure Quali-fications, the Acceptance Criteria used and the results of the examination performed.

The ISI on the Class 2 and Class 3 portions of these systems and components as well as the Spent Fuel Cooling System are to be performed during our first refueling outage as scheduled.

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DOCKET No. 50-346 ATTACHMENT 1 SERIAL NO. 1-84 ITEM 1(b):

Provide a description of water chemistry controls, summary of chemistry data, any design changes and/or actions taken, such as periodic flushing on recirculation procedures to maintain required water chemistry with respect to pH, B, CL , F , 0 2 *

RESPONSE

Attachment 4 provides a description of water chemistry controls associated with these systems and their subsystems, a summary of chemistry data, identification of these systems as required by Technical Specification. Pump testing is performed every 31 days to verify system operability.

ITEM 1(c):

Describe the preservice NDE performed on the weld joints of identified systems. The description is to include the applicable ASME Code sections and supplements (addenda) that were followed, and the acceptance criterion.

RESPONSE

The preservice inspection of Class 2 and Class 3 systems and component under ASME Boiler and Pressure Vessel Code 1971 Edition through Winter 1971 Section XI was not required to be performed < hen Davis-Besse Unit No. I was under construction.

The preser' ice inspection of Class 1 systems and components, as identified by Attachments 1 and 2 of this letter, was performed under ASME Boiler and Pressure Vessel Code Edition 1971,Section XI, through the Winter 1971 Addenda.

ITEM 1(d):

Facilities having previously experienced cracking in identified systems, Item 1, are requested to identify (list) the new materials utilized in repair or replacement on a system-by-system basis. If a report of this information and that requested above has been previously submitted to the NRC, please reference the specific report (s) in response to this Bulletin.

RESPONSE

In response to Item 1(d), Davis-Besse Unit No. I having been in operation for approximately 18 months, has not, to date, experienced any apparent cracking as identified by Item No. 1 of this bulletin in the above listed systems.

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. A*TACID{ENT 2 DAVIS-BESSE UNIT NO. 1 NONDESTRUCTIVE EXAMINATION PROCEDURES (BULLETIN ITEM la)

B BER TITLE REVISION DATE IST-107 Ultrasonic Examination of Full .,.

Penetration Nozzle Welds from the / 0/76 Inside Surface ISI-108 ' Transfer Calibration Technique for 4 1/30/76 Ultrasonic Examination

• of Plate and Weldments ISI-109 Ultrasonic Examination of Seams of 7 1/30/76 Dissimilar Weld Metal ISI-110 Ultrasonic Exam'ination of Nozzle 4 1/30/76 Knuckle Area from the Outside Surface ISI-lll *' Automated Ultrasonic Examination of 2 .

7/22/7!

Reactor Vessel Weld Seams,' Nozzle Welds and Ligament Area ISI-ll2 '

Ultrasonic Examination for Thickness . 2 1/30/76 Measurement Usi'n'g Pulse-Echo Techniques ISI-ll6 Ultrasonic Examination of Reactor 2 *1/30/7E Coolant Pump Motor Flywheel ISI-200 Dye Penetrant Examination of Clad 2 1/13/7!

Surfaces ISI-210 ' Dye Penetrant Examination of Base 2 ,. 1/15/7!

Materials ISI-220 Dye Penetrant Examination of W31ds <- 2 1/14/7!

ISI-230 Penetrant Examination of Nuts,. Studs, 2 1/14/7!

Bolts and Washers ISI-250 Wet or Dry Method of Magnetic Particle 2 1/15/71 Examination of Nuts, Studs, Bolts and Washers ISI-252 Magnetic Particle Examination of Reactor 0 10/9/7!

Coolant Pump Motor Flywheel ISI-253 Wet Method of Magretic Particle Examin- 0 1/12/7t

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ation of Studs, Bolts and Nuts Using Fluorescent Particles ISI-260 -Wet or Dry Method of , Magnetic Particle 2 1/16/7!

Examination of Welds .

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- Radiographic Examination of Welds and.

D. 1 Base Materials-2 Ifl5/7!

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LIST OF APPROVED INSERVICE INSPECTION PROCEDURES

{yMBER TITLE REVISION DATE ISI-50 Surface Conditioning of Welds and 2 12/26/74 Adjacent Areas for Nondestructive Examination ISl-52 Accessibility for Inservice Examin- 0' 4/22/76 ations where Removable Insulation is Used ISI-60 Administrative Pfocedure for 0 8/3/74 Purchase and Use of Consumables ISI-61 9* Administrative Procedure for Control 2 7/28/76 of Manuals and Reports .

ISI-62 Administrative Procedure for Control 0 8/29/74 of Documents ISI-63 Administrative Procedure for Approval 1 12/26/74 of Manuals and Reports for Toledo Edison Company's Inservice Inspection Program ISI-64 Administrative Procedure for Handling 7 7/23/76 Nondestructive Examination Data for Preoperational or Inservice Examinations ISI-80 Administrative Procedure for 6 3/23/76 Freventative Maintenance of Nondes-tructive Examination Equipment ISI-301 U1:rasonic Examination of Similar 11 1/30/76 Metal Weld Seams and Attachment Welds ISI-102 ';2trasonic Examination of the Base 7 1/30/76

.- Metal Areas Bordering Welded Seams and Base Metal Repairs ISI-104 Ultrasonic Examination of Ligaments 8 1/30/76 Between Threaded Holes and of Studs and Bolts 1 Inch and Larger in Diameter ISI-105 Ultrasonic Examination of Nuts and 5 1/30/76 Washers ISI-106 Ultrasonic Examination of Full 4 1/30/76 Penetration Nozzle Welds from the Outside Surface -

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ATTAC101ENT 2 (CONTINUED)

- h' UMBER , TITLE REVISION DATE ISI-350 . Visual Examination of Welds and 3 10/13/75 Surface Conditions ISI-366 Identifica' tion and Layout of Welds 0 11/27/72

and~ System Components ISI-365 Xpplication ofiWeld or Part Identifi- 1 4/25/77 cation Marking'for In, service Inspection l

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DOCKET No. 50-346 ATTACHMENT 3 SERIAL NO. 1-84 Procedure Acceptance Criteria The NDE procedures listed in Attachment 1 meet or exceed the general requirements of Paragraph IX - 3100 of Section III of the ASME Boiler

. and Pressure Vessel Code, 1971 Edition through the Winter 1971 Addenda.

The procedures are in accordance with the requirements of paragraph IX-3300 for radiographic examination, paragraph IX-3400 for ultrasonic examination, paragraph IX-3500 for magnet partial examination and paragraph IX-3600 for liquid penetrant examination.

Procedure Qualification The NDE procedures listed in Attachmenr. 1 also meet or exceed the require-ments of Section XI (f the ASME Boiler and Pressurc Vessel Code, 1971 Edition through the Winter 1971 Addenda and are approved for use on Davis-Besse Unit No. 1.

Results of Examination Core Flood System The Core Flood Nozzle to safe end welds were examined by Ultrasonic and Liquid Penetrant examination. During the Ultrasonic examination a low amplitude indication was found on each of these safe end welds. These indications aere due to nozzle geometry. No other recordable indications were found.

Core Flood and Low Pressure Injection Lines The primary-side welds on the two Core Flood line, and the two Low Pressure Injection lines were examined Ultrasonically. Eight recordable indications were found during the examination of the two Core Flood lines. The Ultrasonic examinations of the Low Prssure Injection lines revealed eighteen recordable indications. Of these, two indications were reportable, they were reviewed, and comparisons were made by radio-graphy which showed one as a suck-back type condition and was acceptable.

The other was located at a depth of 1.9" which made it a reflector of the top of the weld. This was a dampable signal which indicated that it was reflecting from the crown of the weld itself and its probable cause was a geometric condition on the inner wall. This weld was acceptable.

Decay Heat Lines The Class 1 piping welds on the decay heat lines were examined visually and ultrasonically. Two recordable ultrasonic indications were found.

One of these indications was reportable, it was reviewed and a comparison was made by radiography, evaluation of this found the weld acceptable.

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High Pressure Injection, Normal Make-Up, Let Down Cooler, and R.C. Suction Drain Lines The primary-side welds on these lines were examined visually and ultra-sonically. Nineteen recordable indications were found of which none were reportable (i.e. geometry, welded restraint interferences etc.).

There were no recordable visual indications.

jh d/8-9 1043 264

DOCKET No. 50-346 ATTACHMENT 4 SERIAL NO. 1-84 Within are the defined limits for chemical control of water within these systems as identified in Item 1(a). This is necessary to protect these systems from corrosion, cracking, embrittlement and wear. In addition these chemical control limits are used to minimize releases to the

. environment. Also attached are our most recent data sheets showing the chemical control data from the BWST and the Core Flood Tanks.

Recirculating Procedures The Make-Up and Purification System is normally running during normal plant operation, recirculating back to the Make-Up Tank, utilizing both trains on an intermittance basis. During plant shutdown conditions, Make-Up System is in recirculating mode through the Borated water storage tank via the High Pressure Injection System (HPI).

Pump operation on the Decay Heat System (DH) and the HPI system are performed on a monthly basis in order to demonstrate operability of the ECCS subsystems, per Davis-Besse Station Ecocedure ST 5051.01 "ECCS SUBSYSTEMS MONTHLY TEST" wb ich states, that the following is satisfied by this test:

1. Verifying pump operation is in accordar.ce with the Technical Specification by measuring the following parameters for each pump, at least once every 31 days:

a) Inlet pressure b) Pump AP c) Flow rate d) Vibration amplitude e) Proper lubricant level

2. Verifying that ECCS piping is full of water by venting the ECCS pump casings and discharge high points at least once every 31 days.

3. Verifying at least once every 31 days that each valve is not locked, sealed or otherwise secured in position, is in its correct position.

4. This test is used to satisfy Technical Specifications for HPI flow, DH flow HPI pump and valve status, DH pump and valve status, Borated Water Storage Tank (BWST) status and Containment Emergency Sump valve status monthly channel check.

Pump operation oa the Containment Spray Pumps are performed on a monthly basis to verify that the Containment Spray System is operable in Modes 1, 2, 3 and 4, per, station procedure ST 5062.01 " Containment Spray System Monthly Test" which states the following is satisfied by this test:

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1. The pumps must be tested in accordance with Technical Specifi-cation. This required the following test quantities to be measured at least once every 31 days:

a) Inlet pressiere b) Pump AP c) Flow rate

, d) Vibration amplitude e) Proper lubrication levels

2. A valve test must be performed at lerst once every three months in accordance with the Technical Specifications.

3. This test is also used to satisfy Technical Specifications for Containment Spray Pump and Valve status monthly channel checks.

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CHEF 11STRY CONTunTC AND DATA t.PD RECIRCULATING PROCEDURES 1

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]~' Analysis Conditioa: storace Specification normat samete reint: notatea Water storace Tanu ss 13 Recommended Frequency of Analysis Remarks TS Boron > 1800 ppm 3 3.1.2.9

. < 2200 ppnB Weekly pli @ 77 F 4.5.- 4.6 Weekly Range may be increased due to presence of Li Chlorides 0.15 ppm tax as CIT Weekly Fluorides 0.15 ppm max as F- Weekly

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Suspended Solids 0.1 ppm max Weekly By membrane filter Turbidity 0.3 JTU max . Weekly Water clarity needed for

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t Condition: Operating Normal Sample Point: Cas Space SS 17 Liquid Space SS 18 Analysis Specification Recommended Frequency of Analysis

• Remarks Oxygen in See Remarks Weekly gas s,sace Oxygen in the gas space must be below the potential explosive mixture of 2 to 4%. Should be less than .1% to avoid 02 problems g) -,

in the RCS. Large amounts of 02 n ~ may be present in the g.as space on startup. This should be checked L._a -b -

~ carefuily before going above 2500F.

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Vent.in~g the tank will eliminate the c_ ,

02 and minimize the amounts of hy-c-f ,, S J .

drazine needed to reduce 02 in the C_ d RCS.

L?_] ga Minimizing hydrazine will E reduce the possibility of chloride r

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elution from the purification demineralizers.

Ilydrogen in See Remarks Weekly .llydrogen should be the major gas space constituent of gases in the tank and according to llenry's law should be equivalent to 13.7-36.5 psia. The other gases should Q

be mainly nitrogen. j p n

Dissolved See Remarks See Remarks Ilydrogen in '

Especially during initial plant h operations, this analysis can be $

Liquid Space .

used t.o determine relationship w between 112 partial pressure in g

gas space and dissolved 112 in the 8 4

water / Should be 15 to 40 stdec/kg Pg LA '

before exceeding 250-F in RCS. c 8

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i A"al YSI8 Specification Recornmend ed Fi i.c,J.'nc,'< ,ijrg., {u. t e, 4

Dissolved Oxygen See Remarks See Re.r. arks 'This should be checked upon stas itip.

in Liquid in can',uaction with 02 in gas spice Space DDmolve.) 02 in the liquid cannot he reduced till low 02 is present in

. the g.es space. Should be less than

.1 ttn before exceeding 2500F in RCS, N9 . .

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Spent Fuel Pool & Fuel Transfer Canal & Refueling Canal g i

Condition: Operating Normal Sample Point: SFP - Demin Inlet SS 156

. FTC - Dip Sample RFC - Dip Sample

, Analysis Specification Recommended Fre pency of Analysis Remarks Boron > 1800 ppmB Weekly In Mode 6, Refueling Canal must be (See Remarks) sampled every 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> per

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Chlorides .15 ppm max as C1- Weekly Fluorides .15 ppm max as F' Weekly ,

s Suspended 1.0 ppm max Weekly Solids (c:-)

CR Turbidity 1 JTU max Weekly.

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2 Core l'Iooding Tanks e t Condition: Operating Normal Sample Point: CF 1-l'- SS 12 CF 1 SS 12 g dysis Specification Recorr.cnded Freque,n_cy_of AnalvsIs Renarks S Boron 1800 ppnn minimum . Monthly should be = 3500 ppm initially

. 5.1 to allo.: for some dilution during the fcel cylec. Performed monthly per Sr 5050.01.

Pil 4.5 - 4.6 Monthly Chlorides .15 ppm max as Cl '

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( < _: 3; Fluorides .15 ppm max as F~ PC Monthly 3, . . _

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